RTTY Transceive for the - Survivor Library

38

30

34

44

N2CR

RTTY Transceive for theKIM·1- req u ires v ideo termina l andAF SK generator............ W88VQD, W83GCP

Keyboard Konvenience- sim pl i f y entry of BAS ICprogram s WA7NEV

DXCC in One Sitting- know your prefixes.. .. . . . . . . . . . . . . WA4FYZ,

78

88

86

92 A Low-Cost Circuit Board Holder- price ta g: 4S¢ Steele

CB to 10- part XV III: severa l Pll rigs. . . . K9PS

PROM lDer for Longer Callsigns-don' t be ca ught short W4VGZ

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Proper FM TransceiverAdjustment-good cl ub project. VEJAVY

48 Dual-Band Smokey Detector- Supe r Scoope r does it a ll. . . W1SNN

64 The DXer's Secret Weapon- costs you no thing W6BKY

66 Foiling Ihe Mad Kerchunker-frustrate hi m with this circuit.... .. . ... ... ......... K5MAT/N5EE

68 Trends in Surplus- it's not what it used to be..... . .. . ....... WA2SUT/NNNfZVB

72 ~ An 8080 Repeater ControlSystem- part IV: addenda N31C

96 User Report: the 1C-245-good th ings co me in sma llpackages W8YA

100 The History of Ham Radio-part V II I. W9CI

138 Improving the Sabtronics 2000-make a good DMM even better. .. ................... ... N8AMR /4

142 Turn Signal Timeout-eliminates two-wheeledembarra ssment Kl0TW

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Just send Wilso n the receipt of your purchase f romyour dea ler, showing your cost, and let us k now whatyou wan t - 5% cash, o r a M-27. But hurry! This offe rexpires mid night, May 3 1. 1979. and receipt must bemailed before Ju ly 1. 1979.

Don't wait ! See your nearest dealer to take advantageof this great Give-A·Wayl

73 Magazine (ISSN 0098.9(10) is published month ly by 73. Inc.• Pil'll! Street . Petelborough NH 03458. Subscr iption rates in the U,S, andCa nada are $18 101 one yea' . and $45 lor three yea rs. Outaide the U.S. and canada, wr ite l or rates. Second cl ass postalle paid at Peter.borouQh NH 03458 and at add itional mailing ctncee. Publication No. 700420. Phon e: 603·924-3873 Microf ilm edi tIon-Univers it yMicrofilm. Ann Arbor MI 48106. Entire contents copyr ight 1979 by 73, Inc , INCLUDE OLO ADDRESS AN D ZIP CODE WITH AODRESSCHANGE NOTIFICATION and send to 73. Inc , Subscrip tion Services Dept. , P.O. Box 931. Farmingdale NY 11737,

editorial by Wayne Green

W2NSD/iNEVER SA.Y DIE

( '\•

Continued on page 776

THE ROVING CAMERAAs i f t hing s aren't bad

enough in New Hampshire inFebruary (un less you happen tobe a sk ier). the InterstateRepeater Society (I detest the

ON TOP OF OLD SMO KEYA recent court case (People v,

Case-NY - 365N E2d 872,87ALR3d 77) Involved a CBerwho reported a radar checkpointover his radio and was arrestedfor th is. He was convicted in ajustice court, and his convictionwas upheld in the County Court.It was then reversed by the Courto f Appeal s. Thi s court held that" under the statute making theobstruction of governmental administration a crime, obstruction must be by means of intimidation , physical force,or interference, or by means of anyindependentl y unlawfu l act andthat the defendant's verbalmessage via his Citizens Bandrad io did not const it ute aphys ical i nt er ference withgovernmental admi nistration ."

Since peopl e seem to worryabout that aspect of CB andhamming, I thought YOU'd like toknow and have the reference.

Another lawyer has promisedto write and let me know moreabout a situation which hasdeveloped in his area in whichhams are virtually exempt fromradar-lnaplred speeding ticketsby virtue of the unsettling effects of a two meter rig in thecar.

My thanks to Attorney Duncan Kream er W1GAY for theabove referen ce.

If you are lazy, like me, andprefer to use the phone , then it'scaveat emptor (buyer beware).

THOSE TOLL·FREE NUMBERSA letter from Ed Leviton AB3B

points out that the Federal TradeCommission has rather strongrules to protect mai l-o rderbuyers, but when you order overthe te lephone, you forego thisprotection. The entire text oft he mail-o rde r merchandiserules are lengthy and havesome strong teeth. A copy canbe obta ined from the Government Pri nting Office, CCHbooklet #4803, $1.50.

make a fortune .. . If YOU'rewill ing to work fo r it. The moneyis there, waiting for anyonewho really wants it .

The other talk wi ll be hamoriented and wi ll try to put thepast, present, and fu ture intoperspective. Does Wayne reallyhate t he ARRL, or is th is a fig ·ment of the im agination foistedon a gullible public by Newington?

What is Wayne really like? Ishe the prophet of doom andgloom or is he a pragmatist,call ing the shots the way theyare? Is Wayne reall y as r ich assome people from Connecticutsay he is? And how in the devildid 73 MagaZine get to be thelargest in the ham fie ld? Bringyour questions, and Wayne willanswer them.

In addition to exhibits bymost of the top ham equipmentfirms, you' ll find dealers fighting tooth and nail for your business. Many are br inging trai lerloads of ham gear to try to sellbefore the s ummer slum p.There will also be some exciting displays of the latest inpersonal and small businesscomputers. Maybe it's time foryou to get more famil iar withthese little buggers and tn tegrate one into your ham etanon ... and home?

ATLANTA, JUNE 16·17While June is a very busy

month in both the microcomputer and ham businesses, noyear would be really completewithout a trek to Atlanta for theAt lanta Hamfestival. First , I'llbe down to Dal las on Ju ne 2-3and be giving talks at t he Dallashamfest on both computer programming and on the presentstate of affairs in amateurradio.

My next stop will be NewYork and t he National Computer Convention (I EEE), wh ereI will talk about computer program development and sales.That's June 5-7, if you 're in thevicinity.

Atlanta's hamfest has beengrowing year by year and isstarting to gi ve Dayton someworries. There are an awful lotof hams in the southeasternpart of the country, and justabout every one of them packsup his family and heads fo rAt lanta come June. Thousandscome in from every southernstate . It's a madhouse ... andit's a ball.

Chaz Cone , the chap who hasbeen pulling this event off (notwi thout a lot of able help), hascome up with some incredibleprizes ... last year th ey gaveaway a car with a completeham rig insta lled. There are somany prizes that it is difficult toescape getting somet h ingwhich is worth more t han theregistration fee.

I' ll be there and be giving acouple of talks ... one on computi ng, with the emphasis onamateur radio .. . and not a l it tle information on how to get into computing and take advantage of the incredible growthwhich th is f ield sti li has aheadof it. Never before have th erebeen so many opportunit ies to

StaffEDITOR/PUBLISHERWayne Green W2NSDIl

EXE CUTIVE VICE PRESIDENTSherry Smythe

ASSISTANT PUBLISHERJelfrey D. Delray WB8BTHI 1

ADMINISTRATIVE ASSISTANTDotty Gibson

MANAGING EDITORJohn C. Burnell

ASSISTANT MANAGINGEDITORSusan G, Philbrick

NEWS EDITORGene Smart .. WB6TQVll

EDITORIAL ASSISTANTSEHsalJ(lih BlackmoleCynthie SmithRlcha"j Phenix

BOOK PUBLICATIONSJim Perry

PRODUCTION MANAGERLynn Panciers -Fms e,

ART DEPARTMENTCra ig BrownGay le CabanaJUdith DalbyBob DrewBruce H&dlnDian OwenaNoel R. Self wa lARPRobin M. SiosnJohn W. White

PRINTINGGary Steinbach

PHOTOGRAPHYBill Heydolphreoe Clu11

TYPESETTINGBarbara J. LalliMary KinzelHolly J . WalshSara BedellDavid Dawe

BOOKKEEPERKnurl E. M. Kaller KV4GGIl

CIRCULATIONBalbara BlockLaura Barnicle

DATA ENTRYMary KinzelDenise Loranger

DIRECTOR OF MARKETINGRoben R. LaPointe

BULK SALES MANAGERJudy Watelmen

SHIPPINGEthan Pil rryBill Barry

RECEPTIONISTBeth Smllh

ASSOCIATESRobert Baker WB2GFEE. H. Barnell WBIlIiX$chley cox WB9LHOTom DIBiase WB8KZDTerry Fo. WB4JFIw. Sanger GreenDave Ingram K4TWJLimy Kahaner WB2NELJoe Kasser G3ZCZBill Pasternak WA61TFJohn SChull, W4FAWaller SCott K80l ZPetel Stark K2QAWChuck Stuart N5KCBill Turner WAlABI

COMPUTER PROGRAMMINGRichard J. Dykema

CUSTOMER SERVICEFlorence GoldmanJoyce TanEllen Blanchard

ADVERTISINGAline Cou tu. Mgr ,Bill YorkNancy CiampaBill HoyleGayle HalbergLori Mug fordRita Rivard

4

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Kenwood' !5 TS-l80S with DFCh; an all50lId• ••t e HF tranc el...",r de signed for t he DXn .the contest operator. and.lI other Am.,eu...who en jo y t he 160 thro ugh IO-m ",l",r bJlnd• .The following features proOle, beyond doubt.that the TS-180S I. the d .sslest rig avallablel

Looking WestBilf Pasttftlilk WA6JTF24854·C Newhall A-e.Newh611 CA 9 132 '

Having just celebrated mythirty·elghth birthday, andremembering back to my teensand th e traumas I went throughto obtain my amateur license. Iwas kind of amazed the otherevening when my friend HarveyRoss WB6YNO recounted thestory of how his now nine-yearold became General classlicensee WD6FLP not long ago.It's an Interesting story, and I'dlike to share it with you.

I've known Harvey and hiswife Bonn ie WA6SNB almostfrom the day we moved to LosAngeles. We first met on the airvia th e PARC WR6ABB repeater and were later forma lly introduced by Walt W6EJK. AsHarvey tells it, one day close totwo years ago he was busy operating 20 CW when his son Davidasked him to teach him Morsecode. After some thought ,Harvey not only agreed to do so,but also made a game out of theproject. David was fast to catchon, and it was not long before hehad mastered the 5 wpm necessary to pass the Novice exam.

To help David with the theory.Harvey enlisted the help of afriend named Bi ll Ellis. Bill ,whose callslgn Is WA6USB,runs what is possibly the nat ion's most successful amateurtrain ing school : Murphy'S Amateur Radio Class, which meetsweekly in Culver City, centernia. At BIll's suggest ion, Harveyenrolled David in Murph y'SNovice training program; themove was a very successful

one. For his eighth birthday,David received quite a present:amateur call sign WD6FLP.Now, many youngsters wouldbe content with attaining a goalsuch as this and move on toother things. However, in thatregard, David is not your average youngster. He had developed a love for amateur radio.end a Novice ticket would justnot sullice. He continued working toward his next major goal,a General class license.

In July of 1978, David thoughtit was t ime to try. Though helite rally breezed through the CWexam, the th eory stumped him.He was kind of di sappointedbut In no way beaten. Back toth e books he went, so that nextt ime the elusive General ticketwould be his. His tenacity paidoff on December 14, 1978, whenhe walked out of the FCC officein Long Beach, California, withGeneral class privileges and theability to sign WD6FLP-ln·terim LB. His first OSO? It happened to be on 450 MHz to inform his very proud father thathe had made it!

What does a nine-year-oldGeneral do, you ask? The sameas any other ham. He operatesall bands, belongs to radioclubs, and is probably theyoungest person to be found ona remote-base system anywhere. Oh, yes, in his spare t imeDavid Is hard at work with hisyounger sister, teaching hercode in hopes of making it anall-amateur-radto family.

The case of Scott LcokholderWB6LHB Is another matter en·tlrely. We have been followingthis legal mailer since it be-

came publ ic some months ago,and here is the final chapter. OnFebruary 6th, Judge LawrenceT. Lydig in Los Angeles FederalDistrict Court passed sentenceupon Mr. t ooknotcer. who hadearlier, on January 10th, pleaded guilty to three counts of using rout and abusive languageon the air. The sentence brokedown as follows: count 1-S500fine: count 2-S500 fine; count3-one-year probation. In addition, the court has forbidden Mr.Lookholder to use his erneteur privileges for the term 01the probation, and, whi le notmaking It a mandatory part ofprobation, th e cou rt did suggestthat Mr. Lookhotoer seek osyctrtetrtc care. In his closing remarks just pr ior to the passingof sentence, the court describedMr. Lookholder as "being adisgrace to himself, his family,and th e amateur service."

tooknorcer'e al leged operat ions as "W6JAM" had raisedhavoc over a number of LosAngeles area 2 meter repeatersfor several months. Part icularlyhard-hit had been WR6ABN,and it has been thought thatmany ABN users would be ores ent for the sentencing. Alas,that was not the case. As isusual in amateur circles,apathydominated the day, with butfour area amateurs in ettendance. Earlier, when the courtwas soliCiting voluntary writtenstatements from those who hadbeen adversely affected by Mr.t cokt roroer's operations, onlyeight area amateu rs took thet ime to write at all. Eight out ofclose to 20,OOO ! The fact tha tnot even 1% of the total ABNusership (Which t hese daysnumbers close to 400) took th eIni tiat ive to express their viewsto th e court when requested is arather sad commentary on the

overal l amateur society. Yet,during the " W6JAM Reign OfTerror ," hundreds o f ant tW6JAM comments could beheard each day. Now, the average on-the-air commentary is tothe effect that the court was fartoo lenient in the case. To thosewho had their chance to affectthe case and were too lazy orapathetic to ut ilize it, I can onlysay, " you blew it."

I do not wish to single out theoverall ABN usership for admonishment in this matter. Lette rs from other part s 01 the nation tel l th e same story. Ajammer is caught, and when itcomes to the nitty-gritty of prosecution, everyone suddenly dlsappears. One or two are left todo the work for many. on-the-enrhetoric against the offender isloud and boi sterous, but overallcooperat ion is nil. Maybe this isthe reason for the developmentof a new kind of mtertereocetrac ing and -oocument auonmethod, t he quiet clandesti neoperatlons which simply gatherinput and develop airtight legalcases. In many areas, it hasbecome obvious thai trying toget the ass istance of t heaverage " Joe Ham" has become impossible. Sure, hecares, but not enough to get outand 'r-hunt the offender or evenwrite a letter of complaint. So. Inmany locations. the small number of people who really are concerned are banding together.Probably you will never knowwho they are until the t ime arrives when a major offender isbrought to justice. Perhaps noteven then. The t ookhorder casehas proven one thing to many: 11has shown that O UT legal eyete m can and will work if we areprepared to use it. Action taken


TASMA 's 1979 leadershlp: Chairman Bob Thornburg WB6JPI (lef t)and Vice-Cha irman Dave Ferrone WA6KOS.

I

/

...

DaVId Ross WD6FLP.

6

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San Hutson K5YY and his station in LJttfe Rock. San says the station changes constantly, but this is It at the moment.

only o ne to get t h ro ugh .Chances are this was PekingSlim, but Bob is watch ing theChina mail nonetheless.

where-there-i e-e-wm-mere-ts·a-way department ... N5XXtired of t ry ing to work throughthe large and unruly mob chasing 3Y1VC on Bouvet and decloed there must be a better way.He obtained the telephonenumber of LA5NM In Norway,telephoned long di stance, andpersuaded LA5NM to ask3Y1VC to li sten for him aftertheir daily 10 meter CW eked. Itworked, and Clark was abl e toadd a rare new one to his DXCCtotal. Clark says the long 'distance charg es were on ly$3.75 for 3 minutes, but he didn'tsay how many 3 minuteses thepersuasion took.

The forthcoming trip in thePacifi c by Peter Sutler calls forhis vessel, Wild Spirit, to be atVR31Chri stmas around June15th, VR3JFannlng around June20th , and KH51Paimyra aroundJune 24th. Exact t imes dependlargely upon the trade wi ndsand currents .

The re ciproc al l i cen s i ngagreement between Haiti andthe U.S. has apparently hit asnag, with no further action being taken. Whi le on the subjecto f Haiti , we might mention t hatthe HH authorities report nosuch license exists for HH2SLwh o has been showing recently.

Slim joined the YASME DX·pedition of Lloyd and Iris Colvinwhile in the British Virgins andhelped fill the log of VP2VDJ. Sofar, he hasn 't forwarded copiesof his logs.

The ARRL is running sometwo months behind In processing DXCC appl ication s. Enclosean SASE and you will at leastknow your ca rds arrived safely.

Congratulations to the newofficers of the Arkansas DXAssoc iation : AF5MIPresi dent,W5LQNNP, K50VCISecretary·Treasurer, and K5YYIExecutiveCommittee.

W3KVQ, the rone-ttme QSLma nager for 9N1MM , haschanged calls and QTHs. He isnow Edward Blaszczyk N7EB,12802 Sun Valley Drive,Sun CityAZ 85351.

Although 160 meter operationis not o ff ici a ll y all owed inGuatemala, you will occesrcnatIy hear a stat ion on. Apparently,as long as the operator iscareful about avoiding Interference, the signa l will not benoted. Guatemala also maintains a ban on phone patches.

A group of USSR type s wassupposed to head out to FranzJoseph Land last April. If youneed FJL a nd y ou hearUK1PAA, UK1PAT, or possiblyR1FJ, you will know they arrived .

The station at YI1BGD nowhas both the FT·101E and

HEARD ON THE BANDSWi th the recent mutual recoq

nltlon between the U.S. andChina, the feeling among manyDXers is that BY stations willsoon be blossoming everywhere. Although the chancesfor a true-blue BY·type operat ion from downtown Peking arebetter than they have been inmany years, those with Insideknowledge believe it may stillbe a bit premature to expect anyimmediate action, especially byany visiting U.S. operators.

T he operation , w hen itcomes, will most likely developalong the lines of the Iraq ectlvtty, where some YUs were able tohelp the locals develop theirskllls and form a national radioc lub. Already, several fo reign.ers working Inside China havebeen allowed to bring in theirt ransceivers and Install antennas for listening purposes.

On January 17th, ON4QX reoported working a station elqning BY1 AA at 1406Z on 14010.The operator gave his name asPyng, was very fluent in Engli sh,and said to QSL via Box 68 inPeki ng. Many Europeans andsome WIKs heard the signal,but apparently ON4QX was the

ttve -etement Te l rex twentymeter beam at 130 feet, butsince moving into large r c it ies,he has had to comprom isesomewhat.

He hopes some day to have asuper station wit h severaloperating positions for visitinghams and contests. San likescontest operation on the lowbands and has over 60 countriesconfirmed on 160 meters.

San Is planning another OX·pedition for later this year andsays he will always be planningone of some sort. One of themost Interesting aspects of OX·pedltions is meeting and get·t1ng to know other hams all overthe world. On his last t rip alone,San met ST2SA, ST2HF, 3B8DA,3B8DA, 3B8CJ, FH80 M, FH8YL,FH 8CJ, D68AD, 10MGM, andman y others in Ital y , GreatBri tain, and along the way .

Respected as a DXer aroundthe world, San was the ADXADXerofthe Year In 1973. He al sowon the Virginia Century ClubAward In 1976, the ADXAAchievement Award In 1977,and the Diplome du T.F.AJ. in1976, and ho lds cert ificates forA 1 Opera to r, WAZ, WAC,WAS·160, DXCC Honor RolI phone and CW-and manymore.

San c laims that once heworks BY and VS9K to havethem all, he will just sit backand play wi th his sports cars.We find that hard to believe. Thefeeling here is that wheneverand wherever there is a new oneto be worked, K5VY will be onone end of t he pileup or theother.

to activate two new DXCC countries on a so lo effort when heoperated from D6A and FHB In1976.

His DXpedition experienceshave made San much in demand as a featured speaker atDX gatherings ac ross the country. He has spoken to the Atkansas DX Assoc iation manytimes, the W9DXCC banquettwice, DXpo, SEDXA in Atlanta,and many others.

A past president of the ADXAand presently head of the Executtve Committee, San was recently appointed to the ARRLOX Advisory Committee. Hefeels this DXAC appointment tobe the crowning point In histwenty years of hamming, espec iall y in light of the seriousaspects of WARC '79 and present DXCC disgruntlement facing the committee.

Stlll in his m id-30s, San is theSenior Medical Consultant forSocial Security in the state ofArkansas. He Is married and thefather of three children (agedfour, ten, and eleven). Otherthan amateur radio, his hobbiesinc lude sporadic coin co llecting(mostly pennies from 1850 on)and Corvettes-he has owned13 Corvettes in the last 11 years.He enjoys hunting and tries togo deer hunting every year. Healso enjoys all sports and, t rueto the medical profession , he isan avid golfer.

Somewhat of an equipmentcollector, his present station includes two Signal Ones and ahome-brew 4·1000 linear, aDrake C·Line and Alpha linear, aCollins KWM2·A and L4B linear,the Kenwood twins wi th a twometer hookup, and a 75A4receiver. Antennas Include aTelrex beam for 20, a duobanderfor 10115, a eloper for 40, adipole for 80, and a loop andshunt-teo tower on 160. He saysthat his first real antenna was a

OXPROFILETh is month's DX Profi le is on

one of the better-known DXersin the world, Dr. San HutsonKSYY/KSQHS, of Little Rock,Arkansas.

San's ham career began inthe mid-1950s when he pickedup an old S-3B receiver andstarted monitoring the hambands . After receiving a fewaSL cards, he decided to get inon the action side of the hobbyand applied for his Novice exam. San received his Novicel icense In 1958, along with thecall KN5QHS, and tour monthslater he passed the Generalclass exam. In 1977, San upgraded to Extra class and received his present call , K5YY.

San has always been primarily a DXer, but because of co llege he missed a few years. During that time, he also missedseveral now-deleted countriesthat would have brought hisDXCC total to nearly 350. As itIs, his total still stands at 333,and he needs only BY and VS9Kto have them all .

Due to his medical pract ice,San has moved around quite abit since receiving his medicaldegree from the University ofArkansas in 1969. However, allof his operating has taken placeinside the state of Arkansas(with the exception of two yearsspent In Broken Bow OK).

San 's first DXpedition wast he only authorized DXpeditionto Swan Island. In the eightyears s ince, he has become oneof the most traveled amateursIn the country, operating fromCE0Z, CE3, ZF1 , KS4, VP2D,FM0, FG0, FLa, FHB, 06, ST2,S10, 3BB, and 5H1, along withF0, 10, and G. San was the firstto operate from 06 and the fi rst

DXChuck Stuart N5KC5115 Menefee DriveDallas TX 75227

.,•~

12

VU2VKK, In the center, visits with VU2GOand VU2GX while the tetrer wait In vain with the rest o f the VU4ARC Laccadive DXpeditioncrew for operating permission that never came.

Jun JA2BJW and his nice station. Jun prefers CW because he isfas cinated by the prospect of communicating his mind to othersthrough intermittent tones rather than ordinary language. (Photocourtesy of N9YL. j

Conrifluedonpage 162

May 25th to the 27th.The EJW OX Net wh ich meets

each Thursday on 14248 kHz at0500Z cont inues to be a gathering spot for Pacific and AfricanOX types.

George Collins VE3FXT willbe on hand September 6th tohelp Vendaland celebrate its independence from SA. A tower isbei ng erected (equipment wasleft on an earlier trip).

Lloyd and Iri s Colvin reportmaking 6,000 contacts fromW6KGfTl5 in coste Rica, split

~",<:·e"l'ts.~.

It"( D I""'"wu....e

r

300·Watl r ig and beam toreplace Horace's littleao-Watler and dipole. He frequents 21320 kHz at 2200Z andthen drops down to the 14225kHz net at 23002. Horace, now82, was first licensed in 1924 asOB2SK. He won the world OXContest In 1932, run ning 5Watts.

OE6EEG is reported to havefo rwa rded th e n ec e s s aryHZ1 BSf8Z4 documentation tothe oxec desk.

A team led by KH6CHL wi llactivate rare Kalawao countyon 10 through 80 meters from

- .

passed and schedules aremade.

RF6F, heard in the CO OXContest last fall , was the RadioClub of Voroshilovgrad there InGeorgia. Their effort netted 7.8million points on SSBand 5.90nCWo The club call s ign IsUK5MAF, and they are reportedto be readying another multimulti operation for the WPXcontest, possibly signing R5M.

VU2KB, often found on 14MHz CW, is an avid stamp corlector and is interested In swapping wi th uke-mtndeo W/K OX·ers.

John Kanode N4MM has resigned his duties with th e W4aSl Bureau after four years ofvolunteer labor. John handledthe W4IK4IN4 section of thebureau. His duties have beentaken over by John Bo ydW4WG, with the address remaining the same.

3B8DA is considering another 3B6 effort this summer.Nothing definite at this time,but we will let you know asplans progress.

Last month, we reported onthe planned activity by BruceFrahm K0BJ from the Yankeerraderon its ninth world cruise.We have obtained a copy of theShip's scheduled stops and willbe reporting these each month.Stops in May Include Samoaand Fiji .

The Gilbert Islands will become Independent this July.Look for a new prefix to replacethe present VR1. Meanwhile,VR1BO can usually be foundaround 28503 kHz from 2000Z.

9MBHG passes along his sincere thanks to th e many OXersworldwide who sent get·wellcards during his recent illness.Some W/K OXers donated a new

FlOX-SOO on line and has askedpermission to operate otherbands and to establish morestations . Meanwhile, it continues to be heard regularly ontwenty.

The Southeastern OX ClubSh ipped a remote vfo to A51PN,wh ich has been making theoperation a bit easier forPradhan.

The first USSR amateur radiomeeting took place lastDecember in Moscow, with over200 of the locals showing up.They are hoping for 160 permission with a t o -watt Input . Aspecial " EU" prefix will be usedduring the summer Olympics tobe held In Moscow next year .

l ater word has It th at K1RHalso worked that BY1AA stationwe mentioned a few items back.Ralph notes that Pyng gave hi sOTH as Pecinng and th at acheck with some language experts at Yale indicated this to bean acceptable way of spellingPeking. Ralph caught the etanon on 28023 at 1455Z. K1 RH,like ON40X, awaits the Chinamall.

N5KC recently received adirect OSl from VR6TC for a000 In August, 1973. Never giveup.

K5MK resigned as OSl manager for 8P6JO, citing an inabil ity to get the stat ion logs as thereason .

C02FA is looking lor 160 action. He has a 75-meter antennaand can usually be foundaround 3800. Sometimes CW,sometimes SSB.

Fernando says that if yousent a aS l for a C02FAcontactand do not receive one in returnwithin six months, you shouldtry again . The mai l somet imestakes three or fou r months getting to Havana and there appears to be little way to speedthings up. Fernando also mentions that IRCs have little valuein Cuba and that a green stampworks much better.

There apparently will be aflood of Individuals and groupsheading 10 the Isle of Man during June and July to operateduring the celebration of the1000th ann iversary of the Isle ofMan parl iament, "Tynwald."look for the GT prefixes.

Bill Rindone,who hasn't beenheard from since he was thefi rst to bring OXCC attention tothe southern Sudan, ST0,reports that he will be headingback out again this summer. Hewill be aiming for the EastAfrica and Indian Ocean area,and more in format ion should beforthcomi ng soon. You mightremember Bill as t he last person to activate Geyser Reefbefore it was deleted from th eOXCC countries list.

If you like six meter OX- andthere Is Quite a bit of Fclayerstuff around these days-monItor 28885, where news is

13

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LOYALISTS

From reading your editorials,which I tend to agree with aswell as enjoy immensely, Itseems to me that there Is morethan enough evidence to firmlyestablish the fact that the ARRLIs detrimental to the future ofamateur radio. When something doesn't function proper ly,It should either be repaired ordi scarded; this is the case withthe ARRL Since il ls operated insuch a manner as to make re-pair nearly Impossible, then, Inmy opinion, It should be doneaway with.

I do not agree with the "butit's all we've got" philosophy.As long as the ARRLexlsts, it is" all we'll nevev-c-tney'u see tothat! You always make the pointthat you've been a member ofthe ARRL lor most of your hamcareer; I fail to see the logic Inspending $12 a year to supportsomething I can't believe in.Were you to quit the ARRL, inprotest, chances are that 50,000hams would do likewise and theARRL would fall In to thatdegree-or do you have 50,000loyal followers? Might be interesting to find out.

More than half the hams Ihave queried about the irreasons for joining the ARRLtell me that they " take themagazine," " just joined to getQST: ' etc. That Is why I wouldnever subscribe to QST-I don'twant to be " represented" bj' the.ARAL, at WARC '79 or anyWhereelse. If we did have a trulyrepresentative amateur radioorganization, I would endeavorto joi n and support it. As I'vesaid before, why don't you andsome of the prestigious hamswho are 73 loyalists resurrectthe Institute at Amateur Radio?It's high time!

8111 Harris K9FOVLafayett e IN - -

BiIt, as far as I know, I have n?loyal followers . . . and I don twant an y. If an yone agrees wilhwhat f write, I want i t to be onthe basis of Intelligence, notreaction and emotion. If I wereto drop out of the ARRL, I doubt

1 1

month. I ditto your commentsabout Sam Harris In January 73.sam was one of my lirst twometer " OX" contacts. back .when 250 miles was a tcnqtrauton that band, and Helen was myl irst Puerto Rican contact on sixmeters. He will be missed.

Please keep up the goodwork, and pray with me t hatpost-WARC '79 days wil l giveyou a rea son to conti nuepublishing an amateur radi omagazine!

Staye Katz W82WIKBudd Lake NJ

IMPRESSED

I'm sorry I haven't writtenearlier to praise you and yourstaff for publishing the finestamateur magazine in America.You may not remember me, butmy wife and I visited you at yourstation on Mt. Monadnock be-fore we were married I th inkit was In 1965 or so backwhen W2NSDI1 was so strongdown here In New Jersey on twometer AM that you could takeout most of the locals on my oidGooney box .

I've always been impressedby your sin cere devot ion toamateur rad io, and I read youreditoria ls with interest each

1 1

P.S. In his last letter, received aweek belore his death, he wro tethat amateur radio was certainly out and that he saw no hopetor It in the future.

Tara Singh was most accom modating when I visited Ran·goon , taking the time to showme all around the city so that Icould take pictures, introducing me to the British Ambassador (there was no U.S.embassy in Burma). and f illingme in on the history of th ismost in teresting country. Itwas during th is short vis it that Imet Gurbux, h is son. Whilevisiting Singapore a few da yslater, I sen t Gurbux somestrings for his badminton racquet via a local ham, alsonamed Singh. Eventually, Gurbux had to leave Burma, andthe only address he had was9V1NR In Singapore, wh o hadforwarded the strings for me .The next I heard, Gurbu'lt wasmarry ing 9V1NR 's da ughterand moving rc the U.S. Quite aworld ! I was saddened to hearthat Tara had pa ssed awaywithout ever getting back onthe air again, for I rememberhow his eyes lit up when heta lked about amateur radio. .. a true love of his . Wayne.

adequate. As no new licenseswere be ing Issued, I was thesecond operator for XZ2KN .Amateur radio was banned on10 January 1964, and no onehas legally operated after thatdate. The licenses are renewedevery year, but with specif ic rnstruct ion not to use the equipment which has not been conf iscated . I might mention thatmy lather was the SecretarylTrea surer o f the B urmaAmateur Radio Society for aslong as I can remember. Mytather was hit by a car whilec ro ss i n g a s t ree t on 11February 1979 in Rangoon. Hedied in the hospital on the 12thand was cremated on the 13th.

Gurbux Singh We9TINRochester IL

•

•,

( " '1 J ~ ' T'. .. . .

1... . 1 •• , r . . ..', " -~.' . ( ..TARA SINGH XZ2KN

1

, am sending a p ict ure o f mylate father, Tara Singh XZ2KN .This Is the latest picture I haveof him, taken just last year.Thiswas taken in Pegu, about 60miles out of Rangoo n. Thestatue of the Reclining Buddhais th e background.

My tatner was born In Kalaw,Shan States, Burma, in 1918and was educated in Rangoon.He graduated with a BS inMech anica l Engineer ing tromRangoon University. He was avery active sportsman andbecame golf champion twice.He also represented Burmaabroad many, many t imes. Hegot his amateur license in 1938and was very active. Soon after,due to WWI I, he evacuated toIndia w ith his family . Theywalked to India, a trek whichtook over 3 months. He had t iedhis radio equ ipment to theratters In the attic to preventdamage In his absence . He wasa contractor and was instru-

Tara Singh XZ2KN.

t. u:'0-

18

ContestsRobert & ker WB2GFE15 Windsor Dr.Atea NJ 08004

NEW YORK STATE aso PARTYStarts: 1700 GMT Saturday,

May 5Ends: 2359 GMT Sunday,

May 6(with a rest period between

0500 and 1200 GMT on May 6)Sponsored by the University

of Buffalo ARC, WA2NPQ, thiscontest Is open to all amateurs.Stations may be contactedonce on phone and once on CWon each band. NY stations maywork each other and mobiletportables changing count iesmay be reworked.EXCHANGE:

oso number , RS(T), and NYcounty or state/province.FREQUENCIES:

SSB-3900, 7275 , 142 85,21375, 28550.

CW-1810, 60 kHz up fromthe bottom of each band.

Novice-3725, 7125, 21125,28125.SCORING:

SCore one point per asot imes the number of multipliers:states, prov inces, cou ntries,and NY counties for NY etattons. or the number of NY count ies for others (62 max .). Notethat this Is the first time NY stations may include NY counties

ResultsRESULTS OF THE 14TH ALEXAN DER VO LTA

arrv DX CONTESTasos Mult. Po ints Bonus Score

1) 13FUE 22. 96 3750 80,640,0002) SM6GVA 199 80 2263 41,000 36,06 7,9603j l5MYL 182 78 1977 24,340,8244) DJ2YA 151 78 1913 39,000 22,570,3145) DLITS 152 70 1888 « ,000 19,919,5206)W1MX 106 48 3S84 31 ,000 18,266,392n I20LW 135 68 1931 17,726,5808) G3UUP 137 81 1861 41,000 15,593,3779) G3RED 140 52 1306 47,000 9,554,680

10) VE2aO 87 « 2090 14,000 8,01 4,52011) K4YZV 67 36 2208 7,000 5,332,69612) DKIIOW 9. ., 1326 34,000 5,144,40413) OH6AA 10. 48 793 33,000 3,991,65614) W3KV 59 33 2044 7,000 3,986,66815) Y03JJ 89 36 951 26,000 3,073,00416) I2ZGP 72 32 1287 2,965,2481nEA4XW 71 43 928 13,000 2,840,07818) 12WEG 99 .2 638 2,652,80419) HB9AVK 64 ., 984 12,000 2,594,01620) 18JRA 71 40 813 2,308,920

SWL1) Horst

Ballenberger 155 71 1932 43,000 21,304,660

operator Flo rida and out-orstate, CW and phone, and to theFlorida club with the highest aggregate score.ENTRIES:

At the di rection of the contestcomm ittee, sta tions and/or operators may be d isquali f ied forimproper report ing , excessivedupes, errors in multiplier lists,unreadable logs, obvious cheating, etc. Anyone disqualified inthis year 's Florida asc Partywlll be barred from the contestnext year. Phone and CW entries are to be separated. Alongwith legible logs In chronological order, a summary sheet is reoqu ired with eac h entry. Thesummary sheet m ust containscore, number of asos, mult iplier, station 's call sign , entryclass and county of Florida entries, power score for Class Aent ries, state/provlnce/countryl region for out-ct-stete ent ries, censrqns of all operators/loggers if mull i-op, name ofclub if part of a c lub aggregatescore, name and address typedor printed in block letters, and asigned declaration that all rulesand regulations have been observed. Inc lude a 154 stamp forcontest results f rom a futureIssue of Florida Skip. All ent riesmust be received on or beforeMay 31, but late OX entries willbe accepted withi n reason. Mailentries to : Florida Skip ContestCommittee, PO Bo x 660501 ,Miami Springs FL 33166.

LIARS 1().X aso PARTYStarts: 0001 GMT Saturday,


May6Sponsored by the Long Island

Amateur Radio Service (LIARS)Chapter of the to-x International Net. The object of the contest

crossmode contacts will countfor contest c red it. Florida stat ions may work other Floridastations, but for a s o points onIy. Out-of-state stations may notwork each o ther fo r contestc redit. Contacts made on reopeaters do not co unt! Flo ridastations will be divided into twoclasses: Class A stations arethose operating portable ormobile on emergency powerand running 200 Watts or lessinside Florida but outetoe oftheir home counties; Class Bstations are all other stationsoperating inside Flor ida.EXCHANGE:

RS(T) and Florida county orstate, province, or country. Outof-state mobile stations operating not within the jurisdiction ofany country send ITU region (1 ,2, or 3) in wh Ich operating.FREQUENCIES:

CW-355, 7055, 14055, 21055,28055.

Phon e - 3945, 7279, 14319,21379, 28579, 146.52.SCO RING:

Flo rida stations count 1 pointper aso with out-of-state oro ther Florida stations andmultiply by the sum of states (49max.), provinces (12 max.), OXcountries (15 max.), and regions(3 max.) actually worked. Maximum multiplier is 79. Out-ofstate sta tions count 2 pointsper aso with each Florida stenon and multiply by the numberof different Florida countiesworked (67 max.). Class A Florida stations only multiply scoreby 1.5 to obtain final total.AWARDS:

Certif icates for phone andCW top single-operator score ineach state, provi nce, OX count ry , and each Flor ida county.There are also five plaques to beawarded as follows: high slnqte-

In the m ultipl ier total.EN TRIES & A WARDS:

All ent ries must con tainname, address, and county (IfNY). Number the fi rst contactfor each new multiplier. Acheckeneet is required for etenons making more than 100asos. Awards to the number 1score from each county, state,or country. Entrants desiringresults please send a Itl 0 $ASE.Logs must be received by June16 to qualify. Send all ent ries to:Michael Bergman WD2AJS, 45Swartson Ct., Albany NY 12209.

FlORIDA aso PARTYStarts: 1500 GMT Saturday,


May 6Th is is t h e 14th annual

Florid a aso Party sponsored byFlorida Skip and all amateursworldwide are eligible and invited to participate. Each entrant agrees to be bound by theprovisions of this announcement, the regulations of the applicable licensing authority,and the decisions of the FloridaSkip Contest Com mi ttee, whichare f inal . All amateur bandsmay be used and all stationswill separate phone and CWlogs! A station may be workedonce on each band on eachmode. Neither crossband nor

NY State aso PartyFlorida aso PartyLIARS 1().X aso PartyWortd Telecommunications Oay ContestPhoneLuckenbach DXpedltionWorld Telecommunications Day ContestCWAnnual Armed Forces Day CommunicationsTestsARRL EME Contest (part 2)MichIgan aso PartyMassachusetts aso Partyca Wortdwide WPX-CWMinnesota asc PartySOWP CW aso PartyDAFG Short Contest-SWARRL VHF aso PartyDAFG Short Contest-VHFARRL Field Dayseven-Land aso PartyARRL Straight Key NightARRL IARU Radlosport CompetitionCW County Hunters ContestARRL UHF ContestDAFG Short Contest-VHFARRL VHF aso PartyDAFG Short Contest-SWScandinavian Activity-CWScandinavian Activity-PhoneARRL CD Party-CWARRL CD Party-PhoneARRL Sweepstakes-CWARRL Sweepstakes-Phone

Calendar

May 2&27June 2·3June &7June 9June 9-10June 10June 23-24June 3O-July 1July 4July 14·15July 28·30Aug 4·5sept 8Sept 8-9sept 9Sep115-16Sept 22·23Oct 13·14Oct 20·21Nov 3·4Nov 17-18

May 5·6

May 12

May 12-13May 19

May 19·20

20

Results

Continued on pBgtt 154

though each ITU zone must becounted as a mult iplier onlyonce.

For th is contest, what constitutes a country will be determined by the ARRL DXCC list. Inorder to obtain the number ofpoints for a country, on eachmode of operation, the sum ofpoints earned by the top S ceotestants of the country will betaken. In t he case of less than 5entries from a gIven country, thesum of poi nts of the submittedlogs wi ll be taken . Pointsearned by participant s considered as c lubs or mutttoperators will not be valid forcountry points sum.

W90A-31 ,995WBIGOB-13,340WIIUB-11 ,186W7UlC-10,296K6MR-5,096W4YN-4,403W5S0D-3,945W1CNU-3,576

NINTH WORLD TELECOMMUNICATIONS DAY CONTESTITU TROPHY 1978

OFFICIAL RESULTSITU TROPHY

First Place-Brazil, 1,649,954 pointsPhone Team

PY3EE 249,622ZZ6AM 181,115PY400 172,200ZV2CK 168,405PP5AZ 161,040

CW TeamPY40D 229,248ZX41TU 175,456PS21TU 160,360PY4MA 82,620PY2BW 69,888

Second Place-France, 413,193 pointsPhone Team

HW61TU 135,168F6EBN 83,127HW51TU 43,530F6DlM 6,256F6BVB 2,924

CWTeamF6EBN 68,556HW51TU 65,496F8TM 4,176F6BHX 3,960F6EPO 1,956

MEDALSGold-7op Scorer 01 the World

Phone-Lithuania, UP2NK, 275,465CW-Brazll, PY40D, 229,248

Silver-2nd Place In the WorldPhone-Brazil, PY3EE, 249,622CW-Brazll, ZX4ITU,175,456

Sronze-3rd Place In the WorldPhone-Brazil, ZZ6AM, 181,115CW-Brazll, PS2JTU, 160,380

USAPhone

W2LEJ-11,914lU1BARIW3-3,504

N4MM-2,145WB90BX-396WIIUB-264K5DEC-205

CWN4MM-3,S36WBSOON-2,223WBIUCP-950N6Gl-848K4JEZ-776W10PJ-760AA6EE-624WA2POU-413

Results

and ON. To the world top winner on each mode, a silver plate.EXCHANGE:

RS(T} and ITU zone.SCORING:

In the same country, anyband = 0 points (same countryconsidered as same ITU zone);In another ITU zonelcountry: inthe same ITU zone, but differentcoun try = 1 poi nt (any band); Inanother ITU zone, on the samecontinent = 3 points (anyband); in another ITU zone, onanother conti nent = 5 points(any band). Final score Is thesum of eso points multipliedby the number of ITU zonesworked. Repet ition of contactswith the same station on cttterent bands will be permitted

101

105

85144

Points106

8612

WORLDTELECOMMUNICATIONS DAY

CONTESTPhone

0000 GMT to 2400 GMTMay 12

CW0000 GMT to 2400 GMT

May 19This contest, sponsored by

Uga de Amadores Brasllelrosde Radio Emlssao (LABRE), wasinstituted in order to commemorate yearly "World Telecommunications Day" (May 17).Each participating radio amateur will attempt to make thehighest possible number of contac ts with the different ITUzones of the world in order toenable his coun try to win theITU Trophy. Use all bands 80through 10 meters on phoneand CWoCategories include: 1)single operator-multlband; or2) rad io clubs and associations-considered as special multi ·operato r/mult1band pa rticipants .

Points are computed separately, certificates being awarded to the top winner in eachcountry on each mode, phone

To make this area availableto those desiring a OSO,W5TEX will be operating duri ngthe dates/Umes shown abovewith a special e SL cert iticateto commemorate the event. Toreceive the certi f icate, stat ionsshould send a legal size (4" x9W') SASE to WSTEX, 2618RigSby, San Antonio TX 78222.Only OSOs confirmed by WSTEXlogs will receive the certificates.The cert if icates wilt be 8v," x11" , printed tricolor on bondpaper, and should bea welcomeaddition to any shack.

Operati ng frequencies are:CW-7110 and 21110 ±S kHz;F M - S2.S25 , 29. 600, an d146.S2; SS B-3900, 7235,1428S, 21360, 28625, 50.110,144.200, all ± 5 kHz.

Kennedy Associates, theSouth Texas Yaesu dealer, haskind ly provided Vaesu radiosand station equipment, wh ileantennas will be furnished byWilson Electroni cs for this special operati ng event.

CallVE6BKOWA1S0BWB2MANNo EntriesWD40lRNo EntriesW6ElRWB7UFONo EntriesWB9YJF

RESULTS OF THE FLATLAND FARMER 1D-X CHAPTER OSOPARTY, DECEMBER 3, 1976

World Leader and Grand Champlon-WB7UFO, 144 pointsArea Leaders

AreaDXFirst U.S. Can AreaSecond U.S. Cali AreaThird U.S. Call AreaFourth U.S. Can AreaFifth U.S. Can AreaSixth U.S. Cali AreaSeventh U.S. Call AreaEighth U.S. Cali AreaNinth U.S. Cali Area

is to contact as many stationsas possible on to meters, 28.9to 29.2 MHz.EXCHANGE:

Station call , name, OTH, and1a-X and LIARS membersh ipnumbers.SCORING:

Score 1 point per contact; enIy 2·way OOOs are valid. Add 1point for each 1().X number and1 point fof each LIARS numberwith a maximum 01 3 points perexchange.ENTRIES & AWARDS:

Only 1Q-X members are eligible for awards. A uret- andsecond-p lace cert if icate t oeach state, province, or DXforeign country. A trrst-pracetrophy to highest scoring parti cipant hold ing a LIARS number. Any clear method of logging will be acceptable. Includeyour LIARS number, if any. Senda copy to: Bob Watson, 2 Sutfolk Cou rt , Oceanside NY11572. Please Include an SASEIf a copy of t he result s Isdesired. Logs must be receivedby June 15.

LUCKENBACH OXPEDITION0800 May 12to 1200 May 13,1979 Central Standard Time

Calislgn: WSTEXThe idea of a " Luckenbach

Dxped ition " began as ajoke between several stati ons, Inc lud·ing WB5VDL, KB5DV, WB5AOO,NSAOW, and AlSO, in earlyDecember of 1978. During thecourse of operating around thebands, they found many amateurs had not only heard ofLuckenbach, but also lookedforward 10 working a stationthere.

Luckenbach, located In theheart of the Texas hill country,was brought to national ettentron by a country/western hitsong by Willie Nelson. It is atown virtually untouched bymodern c ivi lization and is nestled between two small rivers. Itboasts a general store, onehouse, and a barn . Their firstpay telephone was just installed late last year. It is notuncommon to drive the onlystreet In town and have to stopfor the cows to cross.

21

RTTY Loop

Fig. 1. WilHAQ's mystery circuit.

Man; /. Leawry, M.D. WA3AJR4006 Winl. RoadR¥Id.lIsrown MD 21133

This month , we complete thesecond year of ATTY loop. Imust say thai it has been, andcontinues to be, a real thrill tobe able to share so many facetsof RTTY communication withyou all. We have covered a lot 01ground in these past two years.Early columns started with thebasics of teretvcera circuits,and lately we have worked intod ig it a l logic systems . Thi smonth, we will d ip into the bUlging mall sack, in no particularorder, 10 answer, respond to, orpass along some of thethoughts that have been sent intome.

Slarting out on a somewhatoddball vein (but that 's routinefor this column), I have a letterfrom Jerry Keefe W0HAQ. Jerryhas an SWTPC 6BOO computerand a KSR·33. The KSR-33 wasapparent ly used in Britain witha non-standard interf ace. Jerry,the teletype should d irectly Interface with the serial (MP·S)interf ace o f the SWTPC 6800.You have sent along a c ircu it,reproduced as Fig. 1, that wa sgiven to you as an "R&232 interface ." By my unskilled butlogi·cal eye, there is definitelysometh ing wrong here! Anyreaders wi lling to commit themselves may write their opinionand I wilt pass it along to Jerry.In the meantime, it might beworth your while to try to get the"standard call control unit" thatwill turn your ugly duckling intoa beauti ful swan-etype.

Speaking o f computers(how's that for transition), DaveEwing WB9PHQ sends alongword that he is up and runn ingw ith a bare KIM-1 and homebrew 567 decoder. Sounds Interest ing , Dave. Send along somedetails and we will try to spread

tions would also be handy.Some 01 you may question

why I take the space to rundown this or that ham's gear,Teletype, computer, etc. When Iwas new to RTTY, or ham radioIn general, I was frequently confused by the vast (at that time)proliferation of equipment andsystems. Now, here we are in anage 01 sophistication. Model99s , 6880 computers , andLSM FT rush into the novice'svantage and mingle into anamorphous blob. What I hope todo is show, by example, whathams are using now on the air.Hopefull y, the old and the newwill integrate into a unifiedscheme and the newcomer willbe a li tt le better inlormed whensomeone offers him a " sli ght lyused Mod el 12." So much forphilosophy.

Next month, we will begin thethird yea r 01 RTIY Loop as webegan the second -exploringthe computer in ATTY. I will present a transmitting program forthe SWTPC 6800, using a parallel port for output. As with thereceiving program of last year,flowcharts will be Included toallow adaptation 01 this program to other systems. Untilthen, keep on roopin'I

owner's manual and alignmentinformation for the Courier 50FM . Any help will be much appreciated.

Walt Persans WA2ZBE135 Roe St.

Staten Island NY 10310

I am interested in getting Intouch with anyone who wouldlike to be involved with anorganic gardening net.

Cart Gorodetzky WD4DKP3526 Richland Ave_Nashville TN 37205

I have an Eico 720 transmitterthat I would like to bUy an Eico722 vfo for. Anyone having sucha unit for sale can get in touchwith me and we 'll work out thedetails. Thank you .

Frank D. Papnyckl KABCKY1529 Henry Ave. SoW,

Canton OH 44706

I am in need of a Shure M·5Dmonaural phono cart ridge for anexperimental circuit. I called thewarehouse in Evanston, Illinois,and Shure does not have this instock anymore. Are there anyspec ial shops that might stockhard -to -get parts li ke th i s?Fell ow amateurs seem to be theonly source of help. I will gladlypay up to $20.00 lor one fromsomeone'e junk box.

Geoffrey W. Tllga WA2YIX196 South Main St. #3

Brockport NY 14420

Ham Help

last member of this month'steletype group is Howard OlsonWA9KEK, whose RrTY equipment consists of a Model 19feeding either an teem 245 lortwo meter RTTY or an NCX3 forHF work. While the abundanceof hams on ATTY are usingequ ipment produced by theTeletype Corporat ion, and mostof those are using Model 15119setups, there is no clear consensus.

The second most popular machine is usually a product of theKleinschmidt manufacturingconcern . A. B. Gober, DDSW5ZNN writes of the CorsicanaTe letype Society. It seems heand another member, N5ALA,are working on a few Klein·schmidt Model TT·l00B·FG rnachines. Also laboring on one ofthese is Rob l awson WB4BSZ,who is sweating over a TT-l17·FG. Anyone having good wiringand application material is invited to send it along to this column to help get these and otherfraters out of a jam.

Along the lines 01 the presstransmissions mentioned earlier, Rob raises the possibility 01copying weather data from stetions located down south wherehe lives. Any data on these sta-

I need plans for a 2m duplexer that we can build fo r ourclub repeater. We would be Interested in buying a usedduorexer if someone has one.

Gene Kirby W8BJNUnion Co. Amateur Rad io Club

13613 U.S. 36Marysville OH 43040

I need the schematic andlor

We are presently setting up aSchool of Communication hereat Toccoa Fall s College, ToccoaFalls GA. Being a ham, I havepresented the possibilities ofamateu r rad io as a way of communicati on . We have beengiven a room and space for antennas. Some of the studentshave already started working oncode and theory. We are nowlooking lor good used equipment for the club station . Anydonations of such equipmentwill be apprec iated. Taxdeductible receipts wi ll be givenfor the good equipment.

We also have a Nagra IIISwiss-made tape recorder lorwhich we need a manual. If anyone has one, we would like tocopy it. We would bUy one if anaddress can be given as towhere to write.

Any help given will be appreciated.

Dale McMlndes KA4HBWToccoa Fal ls College

Toccoa Fall s CA 30577

the word to other KIM and 6502owners.

George Young K4SDG is another SWTPC 6800 owner who istrying to get a system up andrunning on ATTY. George asksabout ASCII-ta-Baudot convers ion in hardware. Well. I wouldrather do the conversion in sottware, as the receiving programof last year shows, but, if youare Insistent, 73 has publishedseveral good hardware convers ions in the past few years. Onewhich comes to mind ratherquickly was an ASCII-to-Baudotconverter described by ColeEllsworth W60XP on page 52 ofthe February, 1976, issue of 73.This design converts all ASCIIcharacters to the corresponding Baudot character, fillingcharacters which have nomatch with a Baudot blank.While you're looking at that article in the magazine, you mightwant to check out the coversto ry, too. It's out of this world.

One of those things we a lllike to do is try to copy some ofthe commercial and press RTTYtransmissions for personal enjoyment. Bob Magill WA6MUGis one of several readers fnterestecl in such information . Iwou ld be willing to compilesome sort of li st, If any data Isavailable. Readers with information on commercial, press,etc., RTIY transmissions areasked to jot down times, frequencies, Shift, speed, ASCII orBaudot, and send them to me atthe above address. I'll try to present some useful form in thefuture.

Some more inquiries havecome in on the Microlog RTTYsystem. To Lee Lust WA2ETQand the others who have askedmy opinion by mail and via othermedia, al l I can do is reiteratewhat I sa id a few months back.As of this writ ing (March, 1979),data promised me in OCtober,1978, has not arrived. Severalhams have used the system,and, while it appears to performas advertised, it is rt-seneruve.ttyou have any rf around theshack, as with a high swr, youmay have trouble. Caveat emptor .

A quick QSL to Clifford Er·back VE5QY up there in MooseJaw, Saskatchewan, Canada.With a Model 15, Flesher 170,and FT-l01E, he has qutte a niceRTTY station. The F1200B linearand TH6DX beam only help toget him Into those "gray areas,"right Cliff? Tom (no last name)WB8BDG is another member ofthe kilowatt club who feeds hisTR41nto a MLA2500 linear. Teletype Model 15and 14equlpmentprovides the green key mterface , along with a HALST-5. The

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crease " ta lk power" without introducing distortion and spratter. lt's packaged in a very attractive all-metal enclosure thatis several cuts above the cheaplooking boxes used by some accessory manufacturers. Thesmall size (6" x 21/2" x 6") of theunit and the smooth feel of thecontrols give the RF-440 theaura of a precision watch. tt'ssolid.

The RF·440 simply installsbetween your microphone andtransceiver. It comes pre-wi redfor Kenwood equipment, so Ihad to swap connectors to useit with my Heathkit gear. Theprocessor has an internal acpower supply, but it alsooperates from 12 V oc formobile use.

Using the AF-440 is a pleasure. Simply set the gain control!or a proper level using the builtIn meter, then adjust the outputcontro l so as not to overdriveyour rig . I adjusted the outputcontrol using an oscilloscope,then went on the air and wastold that my signal soundedfi ne, wi th no distortion . Alternatively, you could start withthe control set at its midpoint,then solicit on-the-au opinionsfor a final adjustment.

One school of thought saysthat speech processor controlsshould be Ins ide the case soyou can set them and forgetthem. As a confirmed knobtwrocner. I was pleased to seethe controls of the AF-440 rightthere on the Iront panel wherethey belong. This really simplifies matters if you Intend to usethe processor with more thanone microphone or rig. Anotherc.onvenience is an "OFF" peertton on the gain control whichbypasses t he processor forstraight·through operation.Th~ impressive Dalwa prod

uct nne is being distributed inthe USA by the J . W. Miller Division of Bell Industries, PO Box5825, Compton CA 90224.Reader service number B47.

Jeff DeTrey WB8BTH/1Allistent Publisher

_. -••

AI'" SPEECH PROCESSOR

,traduced an addition to it s lineof state-of-the-art CMOS keyers.The Trac Deluxe CMOS Electr~nic Keyer, Model TE 144, contains all CMOS integrated c ircuitry. The front panel containscontrols for speed , weight, tone,and volume. In addition, a rearpanel switch allows "bug " -typeoperation (automatic dots, manual dashes) as well as straightkeying operation. The DeluxeCMOS Electronic Keyer provides both dot and dash memoory, Iambic keying, 5-50 wpm,sldetone, and speaker, al lhoused In an eggshell-whilebase and woodgrained top. It Iscompact in size, 6" x 4" x 2" .The unit is operated on a single9-volt battery and keys bothpcernve- and negative-keyedrigs. Available direct from TracElectronics , Inc. , 1106 RandBuilding, Buffalo NY 14203, orat most dealers throughout theUS and Canada. Reader servicenumber T18.

DAIWA RF·44Q RF SPEECHPROCESSOR

It was the acid test for mybrand new Daiwa RF·440 rfspeech processor: nighttimephone operation on 75 meters.Would the RF·440 really helpmy row-power signal punchthrough the bedlam? My CQwas answered by a station inPennsylvania . After the usualexchange of pleasantries, Iasked him to evaluate the per.formance of the RF-440 while Iswitched It in and out. Theresult of this mini ·test?"Without the processor, youwe re down In the mud; Icouldn't copy anything. Withthe processor, I copy 90%."That was enough for me. I washooked.

Since that first night, I haveused the RF·440 in a variety 01situations. While the resultsare not always as dramatic asthe Instance cited above, theprocessor has yet to disappointme.

The RF-440 Is designed to in -

TRAC DELUXE CMOSELECTRONIC KEYER

Trac Electronics, Inc., has in.

t~ick and operating on a single~1ne-vOlt battery, the PDM 35 isIdeal lor use away from thebencn . However, on the neaatlve s ide, I found that the testleads and , more especially, thetest lead sockets detract froman otherwise outstanding un it.The leads. are stiff and kinky,and inserting and removing theplugs In the sockets Is extremely difficult due to the mechanics of both the plug and socket.This Is distracting becausemode switching is not em.ployed for DCV to ACV tornA/Ohms, and one test leadmust be re-inserted for eachmode.

With the exception of thex 1000 volts dc range and the acposition, all ranges can be usedto a maximum displayed valueof ± 1999. Exceeding this willd isplay EOOO, or = 000, in.dlcatlng that the next higherrange should be selected.

The operating instructionsaccompanying the mu ltimeterare complete and adequate. Aschematic in this booklet Isbarely legible because of s izeeven with the use of a 10X mag:nltter. No parts values or typenumbers are shown on theschematic-only componentreference designators. Because neither a parts list nor atheory section is provided ,these designators serve no purpose.

The PDM 35 comes completewith test leads, soft carryi ngcase, and Instruction book. Anac adapter, 30-kV probe, andpadded case are extra-costitems. Guarantee period is oneyear.

Starshine Group, 924 Ana·capa Street, Santa Barbara CA93101; (BOO} 528-6050, ext. 1052.Reader service number 589.

A. A. Wicks W6SWZAgnura CA

r. /

DELUXE CMOS ELECTRONIC KEVER

SpHO

SINCLAIR PDM 35 DIGITALMUlTIMETER

Although around lor a fewmonths, the Sinclair PDM 35digital multimeter is a veryversatile unit , considering itscompactness, and the price isrlghl! In fact, it may be thelowest-priced com mercia lpocket digital muillmeter onthe market .

The PDM 35 provides a verybright reddish-purple 3YI-d igitdisplay reading to ± 1.999.Polarity of the display isautomat ic and resolution iswithin 1 mV and 0.1 nA (0.0001uA). The decimal point is fixed,so it is necessary to mentallyextrapolate readings depend.ing upon the range selected.For instance, when the displayshows 0.987 and the multiplierswitch is on )( 100, the digits areread as 98.7.

Dc Input Impedance Is 10megohms for lour ranges of devoltage to a maximum of 1000volts. Accuracy in this mode is1.0% :t: 1 count . A single acvoltage position (40 Hz to 5 kHz)permits readings up to 500volts rms, accurate to 1.5% :t: 2counts, with an input impedance of 450k Ohms. Six c urrentpositions switch from 1 nA to200 rnA. Five resistance rangespermit accurate readings fromo~e Ohm to 10 megohms, alsowith 1.5% accuracy. Five additional junction-test ranges arealso avai lable.

The instrument measures reoslstance by forcing a knownconstant current through theresistor and measuring the voltage developed. It is possible

• •uSing the resistance ranges onthe meter, to measure the forward voltage drop of sem iconductor junctions and tomatch the V!'e of transistors.The current used correspondsto the current range scale, andthe display reads the forwardvoltage drop in volts.

Measuring only six inches bythree Inches by 11/2 Inches

New Products

Trac's Deluxe CMOS Elec tron Ic Keyer.

"Daiwa's RF·440 speech processor.

." ' .,.,.,., ' , " " ".,., .,., ." ,,,,,,,,,..,,,,.,,.. ," '" '" " '" "".." .."."""" "."" '" " " ..,u,,,,,,,,," " ,,,,,,,,

Sabtronics ' model 2010A.

YBesu's new FT-101ZD.

-". .....'Ill

10 NSEC LOGIC PROBE ISLOW COST

The new PR6-1 dIgital logicprobe costs less yet offers thefull features of much more expensive probes . It detectspulses as short as 10 nsec andhas a frequency response to 50MHz or better. The unit providesautomatic pulse stretching to50 nsec ( + and -) and is fUllycompati ble with all RTL, DTL,HTL, TIL, MOS, CMOS, and microprocessor logic fam ilies. Italso features 120k.()hm impedance, power lead reversal protection, and overvorteqe protection to + 70 V dc. Constantbrightness LEOs are providedover the fu ll supply voltagerange of 4-15 V. There is an optional PA·1 adapter for use withsupply Vol tages of 15-25 V. Included are a six-foot coiledpower cord and t ip protector.Theunit comes neatly packed in

utecturer. Write Sabtronics International, 13426 Flo yd Circle,Dalfa s TX 75243; phone (2 14}783-0994. Reader service number 8 27.

OK 's PRB -1 dIg ita l l og Icprobe.

4 OU'I"PUT

$ Vo<

an optional test probe. This permits retain ing the display'sreading even when the probe Isremoved from the circuit. Themodel 20 10A OMM providesstandard ac, dc, and highllow·power resistance measurements in 31 ranges.

The model 2010A OMM Is oesigned for current measurements up to 10 Am ps tee or dc),wi th an ac frequency responsefrom 40 Hz 1050 kHz, and withan input overload protection to1200 V de or rms on voltageranges. A unique feature of thisOMM is a " t imes 10" mu lt ipl ierswitch for conven ient setting tothe next h igher decade range.

8ingle-eh ip LSI ci rcui t ry isthe basis of th is compact un it ;the display Is made up of largeLEOs tha t read to ± 1999 withautomatic decimal poin t. Themanufacturer has incorporateda stable bandgap reference forlong-term accuracy and statesthat typ ical De V accuracy is0.1 % ± 1 digit . Other featuresof the unit are automatic zeroing, fu se protect ion on Ohmand current ranges, automat icpolarity, and overrange Indicat ion.

Optional accessories for themodel 2010A Include a touchand-hold probe for measurements in nerd-to-reach places,a high·voltage probe, rechargeable nickel -eadmium batteries,and an ac adapterlcharger. Allare availab le from Sabtronics.

The model 2010A may be ordered directly from the ma n-

MOC500516 dig ital op tocoupler schema tic.

, ../

IT -f()I 1

d igital logic compat ib i lity .Such applications include Interfacing computer term inalsto peripheral equipment, interfacing w ith mi croprocessors,dig ital contro l o f power supplies, motors, and other servomach ine uses.

Designed as a digital converter, the application of currentto the LED Input results In a lowvol tage output; with the LED off,the output Voltage is high. Theci rcuits are current-, vouace-,and temperature-compensatedand will sink an eight-gate fan out (13mA) from OTL, TIL, orCMOS with an applied powersupply voltage of 5 vol ts and 16mA applied to the in put. Theunits offer buil t -in hysteresisand internal pu ll-up resi stor andfeat ure low power consumptionof 4 mA (typical) @ 5 volts in theON state.

Delivery Is from factory stockand authorized Motoroladistributors. Motorola SemiconductorProducts tnc., PO Box 20912,Phoenix AZ 85036: phone (OO2}244 -6900. Reader servicenumber M20.

NEW lOW-COST 3Yz·DIGITDMM OFFERS TOUCH·HOLD

FACILITYSabtron lcs Internat ional o f

Dallas, Texas, has introduced anew low-cost bench/po rtab le3'h-dlglt oMM that feat urestouch-and-hold capabi li ty with

YAESU INTRODUCES THEFT·101Z0

Yaesu Elec tronics corporat ion of Paramount, Cali fo rnia, ispleased to announce the jntrocucnon of the FT-101ZD transcejver.

The FT-101ZD is all new indesign and offers many of thefeatures of the internationallyacclaimed FT·901DM.

The FT-101ZD is a no-cornpromise HF SSBlCW transceiver wh ich off ers variable l-f band·width for 2.4 kHz to 300 Hz,dig ital plus analog display,built-In rf speech processor, abu ltt -ln ac power supply, a newhighly effective noise blanker,rugged 61466 final tubes, allband coverage 160-1 0 meters,WI/W , plus WARe band expand·ability and a true frequencycounter (no more recallbratlngwhen changing modes).

Addillonally, the FT·101ZD Iscompatible with all of the FT901 0M accessories.

The FT·101Zo is now available from your local Yaesu deerer. Yaesu Electronics Corporation, 15954 Downey Ave., POBox 498, Paramount CA 90723:phone (2 13}633-4007. Readerservice number Y1.

HIGH-SPEED DIGITAL OPTOCOUPLERS FOR S-VOLTLOGIC INTRODUCED BY

MOTOROLAMotorola has introduced two

fa st , low-cos t , d igita l o ptocouplers for 5-volt log ic appli cati o ns . Des ignated t heMOC5005I6, they offer 7500-vo ltpeak ec Isolation and are ULrecogn iZed.

The new high-speed optocouplers' turn-on time Is 225 ns(typical) for the MOC5006 and420 ns (typ ical) f or t heMOC5005. The two devices areTIL com patible and are designed for applications requ iring very high electrical Isolat ion, fast response time, and

25

CSC's SOD-MHz presca/er. The Communicator If from Pace.

New Bearca! 220 scanner.

a reusable case with completetroubleshooting instructionbooklet. It is available at localelectronics distributors andretailers or directly from O.K.Machine and Toof Corporation,3455 Conner Street, Bronx NY10475; phone (212)-994 ·6600.Reader service number 05.

CSC SOO·MHz PRESCALERNOW AVAILABLE

Continental Specialties corporanon first previewed theirnew PS-500 500-MHz frequencypresceter at spring's NEWCOMshow, then officially introducedit at summer's WESCON show.Actual production began in latesummer, and quantities are nowin stock for immediate delivery.

The PS·500 prescaler hasbeen designed to complementesc's MAX-50 and MAX·100 frequency counters.

For additional information,contact Continental SpecialtiesCorporation, 70 Fulton Terrace ,New Haven CT06509; (203}-624·3103, TWX ( 710) -465· 122 7.Reader service number C9.

-II

" BEARCATS 220" SCANNERRECEIVES AM AIRCRAFTBAND PLUS FM PUBLIC

SAFETY BANDSElectra Company has an

nounced a breakthrough development In scanner technology that allows a singlescanning monitor to receivenot only public safety, marine,ham, and other FM Irequencies, but also the AM airc raftf requencies. The new Bearcat220 scanner Is the first scanning monitor which combinesAM and FM reception capability. Until now, two of the mostpopular monitoring activitieslistening to aircraft and listening to police calls-had to bereceived on separate monitorreceivers. But now, six VHF andUHF FM publ ic service bandsplus the AM airc raft ban d arecovered by th is sing le radio.

The new Bearcat 220 alsofeatures t hree search operenons for finding active local frequencies. 11 has the normalsearch operation where frequency limits are set and thescanner searches between

them. All active ai rc raft andmarine f requencies are preprogrammed Into the scanner'ssearch memory so frequencylimits aren't necessary. Theuser simply pushes the aircraftor the marine search buttonand the BC 220 seeks out theaircraft or marine frequenciesbe ing used locally.

Crystal-less push-button I req uency ent ry whi ch waspioneered in the Bearcat 210scanner is used In the Bearcat220. The ectuer rrecuencres being monitored are shown on abright digital display. Up to 20frequencies can be in any sequence or mix of bands. A pnority function is also provided, instantly alerting the listenerwhen a call is made on thepr iority frequency programmedinto the channel one posit ion.Channels can also be ac tivatedin banks o f 10, permitting t heoperator to "call up" a group of10 channels with one pushbutton.

Other features Included inthe Bearcat 220 are patentedselective scan delay, scanspeed selection, aeldc operation, automatic and manualsquelch, individual channellock-out, and di rec t access toany programmed channe l without the need to manually stept h ro ug h channels. El ectraCompany's patented "t rackt uning" is used to provide optimum reception across entirefrequency bands. Complete detaus are available from Bearcatsuppliers or by writing to Electra Company. PO Box 29243,Cumber/and IN 46229. Readerservice nu mber E40.

PACE'S COMMUNICATOR IIPace Communications Divi

s ion of Pathcom , Inc., has beenknown for its superb CB andcommercial FM two-way radioproducts for many years. A fewmonths ago, the Amateur RadioProducts Group of Pace int ro-

duced its Communicator line.Top of the line Is a 4-MHz,800-channel . all-synt hesizedtwo meter FM mobile, the Communicator II.

By using three knobs (MHz,100 kHz, and 10 kHz) and an lnout push-button for 5 kHz, thereceive frequency is rapid lydialed into the un it and disp layed on the .375" 6-dlgit LEDreadout. Transm it is selec ted bya s-costtron rotary switch givingsimplex , :t 6O().kHz, and :t 1MHz splits. When the PIT Isdepressed, the digital readoutautomatically shifts from receive frequency to transmit frequency, leaving no doubt as towhere the unit is set. Also ofnote is a push-on, push-offpower switch that reli eves theuser of having to reset thevolume contro l. The Communicator II weighs 6.6 pounds andIs 6.4" W x 2.8" H x 10.2" l. Current draw Is 1·1.5 A receive and1.5 A (1 W}-6.0 A (25 W) t ransmit.

Using 52 diodes, 8 LED units,32 transistors, 6 FETs, and 18ICs, the Communicator II operates In a 16F3 mode. Power output is 1 or 25 Watts push-but toncontrolled (with the 25 Watts being adjustab le for those whowish ORP). Frequency deviationis :t 5 kHz maximum. Spuriousharmonics are 65 dB below carri er. Frequency stabili ty is :t 5ppm for _ 30 0 to + OO°C.

The receiver is a doublesuperheterodyne using 16.9MHz and 455-kHz i-ts. Sensitivity Is less than .4 microvolts for20 dB quieting (.20 microvoltsfor 12 dB SINAD). Image and receiving spurious rejection is 65dB down; serecnvltv is 65 dBdown at :t 12 kHz. The Internal8-0hm speaker allows 1.2 Wattsat 10% THO. One of the 8-mmplug jacks on the rear mutes lheinternal speaker when an external speaker is connected. Theother 8-mm jack allows not onlyan external speaker to be used.

Continued on 1»f1I 163

26

All NEW

-HIGH-PERFORMANCE HF TRANSCEIVER

Today's technology, backed by a proud tradition, is yours to enjoy in theall-new FT-1 01 ZD transceiver from YAESU. A host of new features are teamedwith the FT·101 heritage to bring you a top-dollar value. See your dealer todayfor a "hands on" demonstration of the performance-packed FT·101ZD.

;asl tronl: ~".I, plus heaY)'I. (:II " _

I -In, fully ..:ljultable, vox1.litry

l·in F1F IP"(:h processor"ore Ml. lk pow••" when you

"I -in, threshold Milu,table,Ie blank...

lipped lor SSB and CW -ntiotl. Choice of wide ortpW NndWidlh tor CW (wittlIoNil CW lilt... in'Ul IIit<l)

ConfinVOU lty varieble IF bIIn6-width : 300 Hz 10 2.4 KHz '-'__.J

Rugged 61468 ' I"..,' amplifi..tutles with Rf neg.llve teed-

."'"RF Bnd AF glln ca nlm ls loc8tedon corte:enlric: ahan, toroperato, convenience

Full band cov...~.: 160 through10 mel..... plu. WWV/JJV(receive only)

IX. FiX, Of' 1'8mK:aiYe trequenc:yottMt from lnII in d iaf frequency

SHlct s witches lor 101M with

LFV-9010M qonlheslzed Kall-

ni"ll VFO (op tio n). FV·901DMprovides ",nnet. plus 40 "llquency memory blink,

mANSMIITER

PA Input Power :100 watts DCCarrier Suppression:Better than 40 dBUnwanted Sideband Suppression :Better than 40 dB @ 1000Hz, 14 MHzSpurious Radiation :Better than 40 dB below rated outputThird Order Distortion Products :Better than - 3 1 dBTransmitter Frequency Response:300·2700 Hz ( -6 dB)Stability :less than 300 Hz in first 30 minutes after 10min.warmup; less than 100Hz after 30 minutesover any 30 min. periodNegative Feedback : 6 dB @ 14 MHzAntenna Output Impedance:50-75 ohms. unbalanced

SPECIFICATIONSGENERAL

Frequency Coverage:Amateur bands from 1.8-29.9 MHz. plusWWV/JJY (receive only)Operating Modes:lSB, USB. CWPower Requirements :100/1 10 /11 7/200/220/234 volts AG.SOI60 Hz; 13.5 vons DC (with optional DC-DCcower ter)Power Consumption :AC 117V: 75 VA receive (65 VA HEATER OFF)285 VA transmit: DC 13 5V : 5,5 amps receive(1.1 amps HEATER OFF), 21 amps transmitSize :345 (W)x 157 (H) x 326 (0) mmWeight:Awroximately 15 kg,

COMPATIBLE wrrHFT401D'" ACCESSORIES

RECEIVER

sensitivity :025 uV for SIN 10 dB5e6ectiyity :2.4 KHz at6 dB down, 4.0 KHz at SO dB down(1.66 Shape factor) : Contlnuously variable between 300 and 2400 Hz (-6 dB); CW (withoptional CW Iilter installed): 600 Hz at 6 dBooen.1.2 KHz at SO dB down (2 :1 shapelactorjImage Rejection :Better than 60 dB (160-15 meters): Better than50 dB (10 meters)IF Rejection :Better than 70 dB (160 . 80. 20-10 m): Betterthan 60 dB (40 m)Audio Output Impedance:4-16 ohmsAudio Output Power:3 watts @100/0 THO (into 4 ohms)

Pnce And SpecillCa!lOnS SUblect ToChange W'thoul NotICe Or Oblogatoon era so: ~9X

YAESU ELECTRONICS CORP., 15954 Downey Ave., Paramount, CA 9On3 • (213) 633-4007YAESU ELECTRONICS Eastern Service Ctr., 9812 Princeton-Glendale Rd.,Cinclnnatl, OH 45246

MicrocomputerInterfacing__------'

GLOSSARYSubprogram: A section ot a program which may perform a part icularoperation to be used with a larger program. Subprograms are notgeneral·purpose and are generall y used by one program.Subroutine: A program which Is general·purpose and which may becalled or used by a main program or another subroutine.Main Program: A short notat ion to Indlcale the software tasks which willoccupy most 01the computer's time.Link: A pointer address Which will point the computer to another sectionof a program or back 10 a program which It may nol be cu rrently Using.Nesting: The operation of one subroutine within another, e.g., a oneminute delay subroutine may can a one·second delay subroutine 60limes.

· 003 ...'03 ... "' START# LX ISP ISY!t90L IC ADDRE SS 0" START.03 ... 37 'U '"'" n "' II.

'" 03 '" LOOP, .. IINPUT DATA "ROM PORT 5

'" .. "' ...'" .. '" OP I ICOMPARE IT rc n.'" .. ... n.'" " a ta Jt '" " MATCHES ec 'to - DETECT-

'" .. ... D!T ECT

'" " 003 •10 ' " '03 ," P 1 1 " I T DIHSN ' T !tATCH, co rc

'" " '" LOOP I LOOP NfD CHECK AGAU~

'" ,. '" •.03 .. '" DI:T ECT, MOVAC

'" .. 323 ""'" " ..,. m

'" .. ... KLT

Table 1. Software example showing a typica l assembler output.

Peter R. RonyJonathan A. TitusChristopher A. TitusDavid G. Larsen

SUBROUTINES AND STACKSSubrouti nes are power ful

soft ware building blocks. Theyfac il itate prog ram development since they may be wri ttenand tested apart Irom the mainbocIy of software. In addition,they can be adapted lor usewith almost any type of program. In this month 's colu mn,we wllliocus upon their operat ion as we ll as on the use ofslack instructlons.

Both unconditional and cond it ion a l jum p Instructionstransfer computer control toanother soft ware task start ingat th e sixteen-bi t addressspecif ied with in the jump Instruct ion itse lf. The jump tnstruction is a one-way branchsince it points to a single address, as illustrated in Fig. 1.lnmany software tasks, however,th ere exist short subprogramswhich are used repeatedly. Examples of suc h ta sks includemathemati cal c om put at io n,control , and telety pewriter input/outpu t routines. It seemswasteful to duplicate thesesubprog rams throughout themain program, so an attempt ismade to separate them at theend of the mai n program and, insom e manner, branch to themwhen they are needed.

". ,~ _...

,0'c

'0'

' 0.(j)

SuB-HOGU ..

'0',..Fig. 1. Diagram ifIustrating thecharacteris tics of the jump instruction.

2B

The use of jump instruct ionsto access these subprogramswill not be successl ul sincethere will be no link back to themain program once the subprogram 's task Is completed .The use of an additional jumpinstructi on at the end of thesubprogram which points backto the main task is unsatlstectory, since jump instructionscan point to a single address.This is also il lustrated in Fig. 1.The jump instructions at 2 and3 point to the same subprogram, but upon completion 01the subprogram's task, thejump instruction at 4 can on lyprovide a link to one place. Anew operation, the cett tnstruction, is req uired. Thi s has theeffect 01 insert ing the sub·program's software steps inthe main program Ilow atpoints 2 and 3, but without theproblems associated with theuse of a jump.

The call Instruction, like thejump instruction, transfers controt to another portion of thesoftware. When that port ionhas completed its task, however, control is retu rned to themain program . This is Illustrated In FIg. 2. In the figure,tw o subroutines are used bythe main program, each being

--~

C.LL

(j)@

-~

@

--12.

-12.

_ OlClmIC 100 I

<W>~,

5,-ooT""" 100 Z

'" ~

Fig. 2. Diagram ilfustrating thecharacteris tics of the call andreturn ins tructions.

accessed by a call instructionwhich specifies the starting address of the subroutine as asixteen-bit, or two-byte, word.At the completion of the subroutine, control is returned tothe next Instruction whichfollows the three-byte call in struction. Through the use ofcall Instructions, the prog ramshown In Fig. 2 has inserted thesubroutine program steps inthe flow 01 the main softwaretask. Subrout ine number 2 isused only once, but subroutinenumber 1 has been used twicealthough It Is present only oncein the mic rocomputer's memo'yo

Each subroutine is accessedvia a ca ll Inst ruct io n andends with a return instructionAET. The return is a one-byte instruct ion wh ich does not contain any address informat ion,yet it acts to return control tot he main prog ram. The return ofcontrol takes place since thecall instruction saves a linking,or return, address which acts tobranch the computer back tothe address of the instructionimmed iate ly following thethree-byte call. The return instruction causes the microcomputer to retrieve the address Irom storage and use itas the link back to the maintask.

The sixteen-bit return addresses associated with call instructions are stored in an areaof readlwrite memory called thestack. The transfer of addressinformation Is performed automatically by the 8080 microprocessor chip to and from thestack during call and returnoperations. Thus, the 8080 chippushes the return address ontothe stack during the executionof a call and pops it off the

stack during a return. The actual memory area set aside forthe stack Is determined by th eprogrammer through the use ofan LXISP Instruction. wh ichloads the sbteen-brt startingaddress of the stack into thestack pointer register locatedwithin the 8080 chip. It is theprogrammer's responsibi lity toset up a stack pointer belorecalls and returns are used; theprogrammer must also makecertain that the stack area willnot be used lor ot her purposesduring program execution.

In the program exampleshown In Table 1, we decidedthat the stack should have astarting address of 003 377. Thefi rst step In the main program,therefore, is to set the stackpointer to th is address usingthe LXISP Instruction. Later.when a call instruct ion is executed , the 8080 ch ip transfersthe ret urn add ress to the stackarea of ANJ memory. If thestack pointer is Initially set ataddress X, the return address isstored with the low addressbyte in location X·2 and thehigh address byte in locationX-1. Thus, the stack adds eadress data at addresses belowthe address value of the stackpointer. When the return eodress is popped back into the8080 chip, the stack pointer isautomat ica lly i nc re mente dback to address X as the returnIs retrieved byte by byte. Whenthe next subroutine is called,the stack locations are used forstorage of the new return address, since the old return address has already been poppedback rnto the 8080.

Subrout ines may be placedone with in another, or nested.


Imagine All The Places You Can TuckICOM's Remotable IC-180. (Think small.)ThE: IC ·28 0 2 meter mobile comes as one radioto be mounted in the normal manner: but, as anoption, the diminutive front one third of the radiodetaches and mounts by its optional bracket,while the main body tucks neatly away out ofsight Now you can mount your 2 meter radio inpint-sized places that seemed far too crampedbefore.

Measuring only 2lf4 "h x 7"w x3% "d, thebantam-sized microprocessor control head fitseasily into the dash, console or glove box of eventhe most compact vehicle. Or if those places arealready taken by the rest of your "mobile shack,"the IC-280 head squeezes into leftover nitchesunder the dash, overhead, under the seat or evenon the steering column.

But don't be misled by the petite size of thissubdivided radio: the IC-280 is jam packed withthe latest state of the art engineering and conveni ence features. No scaled down technology here!

IN'ith the microprocessor in the detachable controlhead, your IC·280 can store three frequencies ofyour choice plus the dial, which allows you toselect from four frequencies with the front panelswitch without taking your eyes off the road.These frequencies are retained In the le-2S0'smemory for as long as power is applied te theradio, even when power is turned off at the frontpanel switch. And if power is completely removedfrom the radio the :::!:600 KHz splits are still maintained!

The IC-280 works fresuendes in excess of the 2meter band with ICOM s outstanding single-knobtuning, so you can listen around the entire bandwithout fooling with three tuning knobs. Withsteps of 15 KC or 5 KC, the IC-280 puts rapid andeasy freq uency change at your single fingertipand Instantly displays bright, easy to read LED's.

Av.U.ble O p tion.: • Touch Tone pad/mlcrophone combmatton.IolIhlch fits the mlc plug o n the radio tece withabsolutely no modification

(FIts .aII /cOM 4-pln rnlc rao::Ios.. J

-IS' UNlS5elTlbled cable kit for Iongdstancereme« mounting of the detachillble

~"'" beed

IC·2802 meter FM. 4+ MHzMobile Transceiver

Jl you lire /I~Iicensed~. !lend for ICOM's catalog llnd discount pu~hMe coupon. MaM your name, eaI1~ and dale of license to your ICOMdistributor (see the bottom of this ad).

A.U lCOM •.,l.... oIunlfk_lwn<'Md FCC.cpl.,......IlmItIng - --_ .

Hf '¥Hf'UHf ..... UEUIl ...NO .....IIINE CO....UNIC ...TlON EOUIP..ENT DISTII18UTE D 8Y

ICOM WEST, INC.sene 313256 Northrup WayBellevue, Wash 98005(206) 747·9020

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ICOM CANADA7087 Victoria DnveVancouve r B,C V5P 3Y9Canada. 604) 321· 1833

Paul L. Schmidt K9PS3108 Brow,. RoodNew Castle 1N 47J61

CB to 10- part XVIII: several PLL rigs

Who called it "Ancient Model"

Photo A. An overall shot of the rig with the case o ff.

Re ce nt ly, many hamshave been conve rting

CB radios to operation onthe 10 meter ham band.With 4o-channel CBs be ingso ld now, the re a re manygood used 23-channel un itsavailable at ve ry reasonab le pri ces. Some of theseunits will make ve ry handy10 meter AM phone transce ive rs, as they conta in excellent AM rece ive r sections as we ll as eff icient

••

4-Watt output transmitterse ct io ns in a small packageideal fo r mobi le use . Oneof these units which maybe eas ily (a few hours ofwork at most) and cheaply(less tha n $10 for the conversion and perhaps $40 toS50 for the rad io) put onten meters is the Midlandmodel 13-882 C.

Although th is article isconce rned prima rily withthe 13-882C, the informa-

tion can be applied to thefollowing radios which usethe PU-Q2A phase-lockedloop IC in the same c ircu itconfigu rat ion:Gene ral Motors-CBD-1 0;Hy- G a in - 26 8 0 , 268 1 ,

2683;Kraco-KCB-2310B,

-2320B, -2330 B;lafayette - HB-650, -750,

-950, Mic ro-223Ala faye tte - Co m -p ho ne

23A, Tel sat 1050;M idl a nd - 13-830 , -857 B,

-882C, -888 B, -955;Pe a rce-Sim pso n - Tige r 23

MK 11 , Tiger 40A (40 ch.);Truetone- CY J-4732A-77,

MCC-44341l-67 .The re are probab ly more

units conta ining the Pl. t 02 A in t he a rrangementdiscussed here. They canbe recognized by thenumbers Pll-Q2A on thechip near the front of therig, th ree c rysta ls in theradio, and the numbersPT BM0 33AO X, PTBMO36AOX, PTBM0 37AOX, 0 'PTBM039AOX on the cit-

cu it board. There are some4D-channel rad ios using thePll-Q2A in a different arrangement (o nly twocrysta ls) whic h cannot beput o n 10 meters by themethod desc ribed here, asthe crystal that has beene limina ted is the crystal tobe changed in thi s modifica tio n. Also, it should benoted that earlier versionsof the uni ts listed above donot use the same circuitry.The Kraco KCB-2330, forexample , uses a crystal synthesizer, and the KCB2330A uses a Pll-Q1A chip,which is not equivalent tothe Pl l-Q2A chip .

Operation of the PLl.()2AThe vo ltage-controlled

oscillator Ivco), whose frequency is co ntro lled by thePll-Q2A c hip and associa ted ci rcui try, providesinjection to the first receiver m ixer and to atr a nsmitter mi xer stage.The osci llator ope rates at10 .695 MHz above the

30

Photo B. Close-up of the channel-switch area o f the circuit board, showing the modification to provide 23 additional channels 320 kHz above the "normal" 23 channels.

operating frequency, or37.660 to 37.950 MHz foroperation on CB channels1to 23.

Output from the vco isalso mixed w ith the th irdharmonic of the 11.80666MHz crystal oscillator[Q105) at 35.420 MHz, toproduce a difference frequency of 2.24 to 2.53MHz, which is fed into pin2 o f the PLl chip. 10.240MHz energy from the10.240 MHz reference/sec·and receiver mixer iniection oscillator is fed intothe IC at pin 3.

Inside the IC, the 10.240MHz signal is divided by1024 to produce a 10.00kHz reference signal. The2.24 to 2.53 MHz signal isdivided by n, where n is anumber determined by thebinary cod ing from thec han ne l switch to pins7-15 of the tC. See Table 1.

For channel 1, n is 224,dividing the difference frequency at p in 2 by 224. Thisfrequ ency is com pared tothat o f the 10.00 kHzreference signal. If the output o f the n divider is lessthan 10.00 kHz, the voltageat pin 5 of the PLl c hip (thecontrol voltage for the vco)is raised , causing the frequency of the vco to increase. If, on the otherhand, the frequ ency of then divider output is higherthan 10.00 kHz, indicatingthat the vco is too high infrequency, the voltage atpin 5 drops, lowering thevee's frequen cy . This action, sim ilar to that of athermostat, regulates thefrequency of the vco. Bychanging the value of n(the job of the channelswitch) or the frequency ofthe 11 .80666 MHz osctllator and adjusting the slugin the vco oscillator coil (toset its tuning range). theoperating frequency of thevco, and thereby theoperating frequency of theentire rig, can be changed,

while maintaining stabilityapproa ching that of acrystal oscillator.

Conversion to 10 Meters

To convert the radio to10 meters, the 11 .80666MHz o scillator must bechanged . The frequency required to give channel 1 afrequen cy of " F" MHz is:

crystal frequency(MHz) = (F + 8.455V3

o r 12.405 MHz for c hanne l1 at 28 .760 MHz, the channel 1 for many convertedCBs now in use, especiallyin the Los Angeles, Cal ifornia, a rea . T he c rys t a lshould be availab le fromany of the major crysta lmanufacturers. When ordering, spec ify the frequency desired and the modelof radio you are converting. The c ryst al manufacturers usually have information o n ho lder type,load capacity, and ot herspecif icat ions for CB unitson file. If not, send a copyof the oscillator schematicalong with the o rd er.

To get the r ig up to ten

meters, the vco must bemoved to near 39 MHz andthe tran smitter must becomp letely real igned. Theeasiest way I have found todo th is is to use a dummyload, wattmeter, or otheroutpu t indicator, f requency cou nte r, o r receiv ercover ing 27 to 29.5 MHzwith some accuracy and asigna l generator o r steadyon-the-air signa l in t hefollowing procedure.

Wi th the unit o ff, isolatepins 5 and 6 of the PLLfrom the ci rcuit board foil(use sol der wick to removethe sol der). Pin 6 is a prote cti o n vo l t a ge w h ic hdrops to O if the PLL fail s tolock up (i.e.. the PlL can'tregulate the vco frequencyfor some reason) and d isables the t ransm itter. Pin 5is the control vo ltage tothe vco. Temporaril y connect a jumper w ire frompin 1 Is-volt supply to theIC) to the fo il at p ins 5 and6, w ithout connec t ing tothe pins themselves. Itprobably wouldn't hurt theIC if the p ins did touch,

but, at $12.00 o r more for areplacement IC, I don't recommend taking c hances.Th is temporary modif icat ion runs the vee at maximum f requency, unlockedfrom the Pll, and overr i d e s t he t ra ns m i tte rdisable l ine, allowing thetra nsm itte r t o f unction .Connec t the w attmeter anddummy load to t he transm itter . Connec t t he frequency counter accord ingto i t s in stru ct ion s t omonitor t ransm itted frequency.

Turn t he unit on and keythe transm itter. The frequency cou nter shou ldread som ew he re above27.4 MHz. Tune the slugsof T111 , L103, L104, T102,T103, L106, L1 09, and L1l0for maximum output (thenum bers are next to thecoils on the ci rcu it board).Exercise ext reme cautionin tuning, as the slugs arevery fragile. Tu ne the vcoosc il lato r co i l, 'ttot . untilthe frequency is about 300kH z higher and retune theabove coils for maximum

Fig. 1. Fig. 2.

31

9 10 11 12 13 14 1S1 1 0 0 0001 1 0 0 0 0 111000101 100 1 0 01 100 1 0 11 100 1 101 100 1 1 11 10 1 0011 1 0 1 0101 1 0 1 011110110 01 101 1 1 01 101 1 1 11 1 1 0 0 0 011100011 1 100 1 111101001 1 1 0 1 0 11 1 101 1 0111 1 0001 1 1 100 11 1 1 101 01 1 1 1 10111 1 1 1 1 164 32 16 8 4 2 1

n Ch. Freq. pin: 1 8224 01 26.965 MHz 0 1225 02 26.915 MHz 0 1226 03 26.985 MHz 0 1228 04 21.005 MHz 0 1229 05 27.015 MHz 0 1230 06 27.025 MHz 0 1231 07 21.035 MHz 0 1233 08 27.055 MHz 0 1234 09 21.065 MHz 0 1235 10 27.075 MHz 0 1236 11 21.085 MHz 0 1238 12 21.105 MHz 0 1239 13 21.115 MHz 0 1240 14 21.125 MHz 0 1241 15 27.135 MHz 0 1243 16 27.155 MHz 0 1244 17 21.165 MHz 0 1245 18 21.115 MHz 0 1246 19 27.185 MHz 0 1248 20 21.205 MHz 0 1249 21 21.215 MHz 0 1250 22 27.225 MHz 0 1253 23 21.255 MHz 0 1255 27 (see lext) 0 1

Binary number: 256 128A 1 indicates 5 volts at pin; 0 indicates no voltage.

Tabfe 1.

output. Repeat the procedure, " wa lk ing" thetransmitter up to about 200kHz above your highest te nmeter channe l (abou t 29.35MHz for channel 1 at28.760 MHz). Turn the unitoff.

Disconnect the 5-voltJumper wire which wastemporari ly insta lled frompins 5 and 6 to pin 1 andreconnect the pins to thefo il. Turn t he unit back o n,a nd set the channel switchto channel 1. Adjust thetrimmer capacitor next tothe crystal for the propero utput frequency. Turn thechannel switch to channel18. Ad just a ll of the coilsment ioned except 11 01 ,the vee coil, for maximumpower o utput. (This is doneat a higher-than-center frequency because the powero utput d rops off faste rabove t he peak frequencyt han below. This is normaleven o n 11 meters andshould not be t he cause ofany worries about changing capacitor values, trimming coils, etc ., unless thecoils just refuse toresonate . All three un its Ihave converted have t unedbeau tifull y with 4 to 5Watts o utput withou t jug-

32

gling any componentvalues.l

Connect the transceiverto the signa l generator o rother signa l source. Set t hechanne l switch to channel12 and adjust the generatorfo r output on the same frequency . Adjust the rfstages in the receiver (T104and L112) fo r maxi mum rece ived signa l st rength ont he S-mete r. Alignment oft he other receive r tu ningadjustments should not benecessary, as the i-ts are onthe same frequency aswhen the unit worked acouple of MHz lower.

Additional ChannelsChanne l 27 may be

ava ilab le in the b lank position between channel 23and channel 1 on the dialby installing an insulatedjumper wire o n the foil sideof the circuit board between t he termina l o n thefar left of t he channe lswitch and t he term inal onthe far right of the switch.This modification will supply 5 volts to the vee and toIC pins 8 through 10 whenthe channel switch is in theb lank posi tion . Chan nel 27wi ll be 20 kHz above channel 23, or 29.070 MHz for

channel 1 on 28.760 MHz .On some units, the blankwill be another channel 1,but it's worth a try and, if itdoesn't work o n you r rig,you can always take thejumper back out.

Each channel ca n bemoved up or down 320 kHzby performing one of thefollowing modifications. Ifo ne of these modificationsis done, each channel willhave two possib le frequencies, one 320 kHz abovethe other . Thus, channel 1in the higher position willbe 30 kHz above the lowerchan nel 23 and 10 kHzabove the lower channel27. In other words, the 320kHz offset switch is se lecting between two differentbands of 23 channels (or 24channels) each. The onlycomponent required forthe mo d if ic at io n IS anSPOT switch, whic h may beinsta lled in the front pane l,or, to p reserve the stockappearance of the radio,the function of an existingswitch may be changed.

To be able to move the23-channel band down 320kHz, isolate pin 10 of theIC by cutti ng t he foil on thecircuit board arou nd it.Then wire t he switch as

shown in Fig. 1.To move up 320 kHz re

quires a little more workand is the modification Ihave shown in the photographs. Cut the foi l on bothsides of the connection topm 7 to isolate it fromground. Then cut the foil toiso la te p ins 8, 9, and 10 as agroup from the switch co ntact and from the thin stripof foil going to one end ofR103, the series resisto r inthe B-plus lead to the vco.Insta ll a jumper from thisend of R103 to the 5-voltline at the left-most terminal of the c ha n ne lswitch or to the pointshown in the photograph,which is just on the otherside of a jumper from theterminal. If this jumper isforgotten, the vco won'toscillate. Connect theswitch as shown in Fig. 2.

After the conversion hasbeen completed. affix alabe l to it in an obviousplace stating that the radiois not capable of operationon Citizens Band frequencies and that an amateurradio license is required touse it. The label could savea lot of embarrassment or apink ticket from the FCC inthe event a passengerriding m your car saysso met hing like "Yo u have aCB just like mine!", picksup the microphone, andyells " Breake r 4" all overthe world on 29.050 MHz .

My 13-882C on tenmete rs has provided quitea few contacts, most ly withstations on the west coast.My dad (Dale K9HIS) alsohas a 13-882C on ten,and my brother (LarryWB9BAQ) runs a 13-857B(an 882C without the no iseblanker or antenna warning light) mobile with at rimmed-down CB magnetmount antenna, workingmostly stations on the westcoast and southeasternU.S. What 4 or 5 Watts ofAM phone will do on aclea r frequency gave mequite a surp rise . Whocalled it Ancient Mode,anyway? •

e MFJ ENTERPRISES, NC 1979

95

AmeriCan construction. Quality components. Oneyear limited warranty.

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dom wire and balanced jre.

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Efficient, eneaplutlted 4:1 ft'rrile bllun. 500pI, 6000 volt casectos. 12 position inductor.CeramiC rotary switch. 2"4 meter.

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NEW MFJ·962 1.5 KW Versa Tuner IIIFor $159.95 you can run up to 1.5 KW PEP and match everything from1.8 thru 30 MHz: coax, balanced ine, random wire. Buih~n balun. SWR,dual range forward and reflected power meter. Rexible six position antenna switch. Outstanding value.

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. h. Matches coax,

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ThI MfJ.911 1.5 leW VInI TIIIIef • gives youa 1\e_1b!e $i_ posilion antenna switch. It lets youselect 2 coax lines ttV1l 1UI"ler or direct. 01 random wire and balanced line.

Ru. 1.5 IW!'£P. Match any leedline from 1.810 30 MHz: coax. balanced line. random wire.

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EnCJpluilled 4:1 lemle IIIlun. 500 pf. 6000volt capacitors. 12 po5llJon inductor. ceramicswitches. 5O-239s. ceramc teeettsus. One yearlimited warranty_

Every l irtgle unit II telled lor performlnce and

95

inspected 101 quality. Sorld American constructiOn,quality components.

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33

PROM IDer for Longer Callsigns- don't be caught short

Take care of RPT.

, • •."

• • r •

plug-in configuration . (See73 M agazine. June, 1977.)Now it seems that a CWidenti fie r wit h longe rmessage capability is needed. due to the demise of

Part s List

Oty Description

8 10k Ohms, If_·W composition2 270 Ohms, 'I. ·W composition1 2.2 uF tan talum1 1.0 uF electrolytic1 100 uF ta ntalum1 10 uF electrolytic1 7474 thp-Ilcp1 74151 paratlel-Ic-serial2 7493 hex divide r1 82823 memory (custom bit pattern)1 7420 gale1 7400 gale1 10k pot, Bourns 3389W

Circu it boards and part s can be obtained from:a .c. Stallord427 S. Benbow Rd.Greensboro, NC 27401

E. E. Buf fington W4VGZ2736 Woodbury D';\I~

Burlington NC 271Jj

The Peter Stark K20 AWCW ident ifier has seen

good service for severa lyears now. Since it was inexpensive and easy to program, I adapted i t to a

--,

----------,,~

,

- - ,

- .

====.

Fig. 1. A "not-so-tvoice!" ca lfsign.

,,••••,••.. •"~' ~ f

" ,

"..".."""ac

"" r

"......"....sc

"

34

I, I, -t.h ,,~

• ". , ". '" '0 ..,.." '. • " ". b" L! 741) ' " \ It 6 •

t:' ,... • • '. ' .. .. • • ;:

". '0 " , • .:!..J ' );' , " .• ,'thOO m'2 ....-,100. '• -,

, " • 11:174 7 .. .'

CCi," ' . ' . " 00 • .. "

,J; .. ,, •, ,, ,• , reoc ,,~

'" ," , , • ,,'I U H , .. 7""1 , ,

-~, " .lI It6 , ," "., .. I AUO'O• " '"., e ~,.,.. l!!' ,1,' 'L " -

7420 , -,no_ , , L

1 "( .~'" •,-, J",'

10>: III f ,.ll ( G ~ O

WR repeater calls . Now wemust identify the repeaterwith the trustee's callsignfo llowed by RPT.

The longest of callsignscan be programmed by altering the bit pattern of the82523 memory. Fig. 1 lists anot-so-typical callsign toshow how much room isavailable on the ROM.

You can do it right thefirst time if you remembe ra few ru les and defi nitions .First , a slot is the minimumlength of t ime betweendata transmissions. Nowthen, a dit is 1 slot highfoll owed by 1 slot low; ada h wou ld be 3 slots highand 1 slot low. The spacebetween characters is 2slots low. You shou ld leavea few slots at the beginningto allow the transmitter tocome fully on. A stop command consists of bits 5, 6,7, and 8, all high .

The leading edge of thestart pulse causes the IC1flip-flop to change state,resulting in the hold comma nd going high. The Qoutput of the f lip-flopenables the two 7493 fourbit ripple counters and the

74151 pa rallel-to-se rialconverter. The 8 bits ofeach line of memory arethus pul sed out until bits 5.6, 7, and 8, being high. aredetected as a stop command. It should be pointedout that no other datashould be on the stop lineas it would never be pulsedout. A keyed CW osci llatort hat furnis hes audio to the

. ~ . ~

Fig. 2. PROM CW identifier.

transmitter completes thecircuit.

This ID unit plugs intothe same socket (with nowiring changes) as the oneshown in my June article. Alogic-high pulse starts it,and during the time thatthe ID unit is running thehold command is high tokeep the transmitter on.

A samp le program is

shown in Fig , 1. As you cansee. this " lo ngest call" usesonly lines 0 to 23. Theremay be room to have evenyour QTH included .

Contest freaks ca n haveseveral ROMS programmedfor their various co ntests.and just plug them in whencontest t ime rolls around . Ihave o ne programmed :" DE W4VGZ Transmitter

2 7 0

8 10 K

100" 1

-'oMr-

f10 K (4 ) EJ I>740 0 J.,IJ'F

I -r270-'oMr-

~E-

I2.2J'F I 74151 ~ 82523 <

-'oMr--"IVY-

---JW'v- I---JW'v-10 K (4)

>7 493 >749 3 B lcI· TIOJ'F

Fig. 3. Component layout.

35

Fig. 4. PC board.

Hunt Hi Hi." I use a VHFEngineering 2 meter transmitter and a 555 timer to

cycle the ID unit. With batte ry power, this un it can behidden a lmost anywhe re.

I will glad ly co rrespondif you have any quest ionsconce rning thi s o r any of

the o ther articl es I havewr itten . Ple ase se nd anSASE! .

,.,

.."

, ,-

(714) 299-9741

Base plus, lower sectionwith cad hardware.SuggestedList Price

• High stability• Modular and portable• Extremely rugged

Base IS apprOllamately 60" h iQh and weiQhs 28pounds. Tower sections are 72" hgh andweigh 21 pounds

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Constructed 01sturdy aluminum alloy. they' resturdy enough to handle large size HF beamsand EME arrays as well, Also available withoptional stainless steel hardware for harshenvironments,

36

SCR1000The Repeater 01 Your Dreams!

EXPORT ORDERS_CONTACT OUR INTERNATIONAL DEPART MENT

Po....er operation.e 8unHn AC Pow.. SupPty" 2VOC e . II . ,y Inp UI wta ulo ,

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ch. nn.ls!• Plug-in IC M. mory Chip!' T...o Inhibit Inputs .e Sl d . 19" Ri ck Mount.

See our April 73 Ad 10f more det ai ls !

. ----~-.

•

e AutO"' l tI" I " Y 10 . yo ur S tllion(Blse or Repealerl per FCCreqUIfemenu .......ry 5-3CI min . Cl d lustl ble •.

e M..II I II FCC requl' .....nt . lorParlS 89. 91, 93, 95, 97 &. o ther IPplicalions.

e C4n••nl.n l Front Pan.1 C4nt'ol.lo r AC Po...e' ; T' iooe' Mode ; (Auto-malic/CO R, Conlinuous, Of DiS'able .; Manua l ID; Local Monila ,Spk' . Vo lume.

• Front Pan. l 5la lu . Indlulo' Lltilhl .lor AC Powe,; ID in proo 'ess; DC

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• Timeout-Timer Reset Tone Annunc iator• And many other " custom·designed" options

per yo ur request-s uch as custom logic , auxil iary receivers, radio links, etc , Please Inqui re.

• Along with a complete line of RepeaterSystem Accessories _•• such as: The FinestDuplexers, Cavities. Cabinets from 7" to 7',Antennas, " Hardllne," Cables, etc.

~~-tl\ID1000Automatic BaseStation CW Identifier

•otl'1 •

S end fo r Da ta Shuts!

• Full Autopatch, wit h or without reverse patch ,and " Landline" or Rad io Remote Control of IheRepeater.

• Radio and/or l andllne TouchTone* RemoteControl o f such repealer fu nctions as HIILOPower ; Patch Inhibit /Reset ; Switc h to Track s:Repeater ON/OFF; PL ON/O FF, etc ,

.65 WI. Transm itt er !• " PL" ·CTCSS; Hl/lO Pwr.; Multl·Freq . Up to 4

different IDs ; Automatic sw itch ing t o" Emergency Power ID" when .o" battery pwr.

Tt\.e SCR1000 - simply the Ii_511f'PN/f'" .".i/ableon the m.rkel - absolu teI" TOP QUALITY throughout . .nd oltt"o compared 10 (l~§{"r featured)unIts ~lll n i for 2·] nmes the priu'! This is. JOWl. u net. wIth a Vei'V sensurve& SE'I Il'C IIVII' fK e i...er . Included is • bu,IHn AC Supply. N EW h PJrKkdMemory CW 10ef, lu ll mete rmg and lighted sl,Jtus ,ndil:<l torsJl:ont 'ol pYshooltons, crystals. 1000a l mic. etc .}oin t.... thouunds of Irt'fl' plu H'd Sp.K" (omm customers ...o rld-...ide ...hoa re ut.ina our aea ' - know-Iedgeable Amateur Rad IO groups, CommerCIal 2XRad IO users, MIlitary & Go vernment Agenc ies_Red Cross. Univenllles_e tcSo, ..... ke ,"our d ream a realit," Call or te SPl"C Comm tOOil Y! Gi...e us allof ,"our repeate r s,"stem rt"q ui,emenu - hether modest or HSuperOelu_e: ' and lei u S send ,"OU a QuoteYhe- SpK (011'1 11'1 lle lM'a ler S,"slem . a sound. lon ll- term inlrt'-Stment - forthose ...1to demand the hnest! Ava,la b le only by drrect factory order Get,"oor order In A S AP.!

Mobil e IPor t. ble' 8 asen.nsceiveu .lso .....i1..able t 5-25 w r., 2. 6, & 12Cha n.; 2M & 220 MHzNow in use in ma ny Professional Communica..tions Systems throughout the world' Wri te orca ll for fu rther info

' R&o 'Sle 'ed T rademaf~ 01 A.T.&T

37

Mart;n W. Krey K7NZA7017 E. Chaparral RoadScousdale AZ 85251

The W7GAQ Key Collection- 250 museum masterpieces

Do you have o ne he doesn't!

John Elwood W7GAQ holds a smaff English spy key thathe swapped for with an English ham. Three and one-halfinch screwdriver shows the relative size of the tiny key.

I t co uld be the Smithson ian Institute or it

cou ld be little FoothillsJunior College in Cal ifornia whi ch houses the leeDe Fore st c o lle c t io n John Elwood W7GAQ isn't

sure which, but one ofthese mu seums, or perhapsso me othe r one in theUnited States, will one daybe privileged to displaythe finest collection ofte legraph keys in the

world . John is devoting hisreti remen t years to acquiring and re sto ring withalmost unbelievab le careas many different keys ashe can possibly find . Oneday when he deems thetime right, he will donatethe whole collection to themuseum of his choice.

At the moment, John 'scollection amounts to 250different types of keys,whic h he is q uick to pointout is not the la rgest collection in the world . But tothis write r, who grew up inthe atmosphere of the toola nd di e-ma king tra de ,it is obvious t hat the re maybe no one e lse on Ea rthwilling and able to spendas much as fifty hourscleaning, restoring, andpolishing a key the size ofa )-38, and more on a complex key such as an original Martin Blue Racer.John Elwood's keys lookmore like a modern elaborate sales disp lay than anantique collection. He hasbeen that deli berate andfinal in his restorat io n andca re of them.

John was introduced toCW radio at the Army Ai rForce Radio School inSioux Falls SD, in 1942, bu tit was several years beforehe go t a c hance to poundbrass. He and his twinbro the r, Henry E. 11 1,

worked togethe r running acontrol net system, VHFd irection-finding sta tion atPaine Field, Everett WA, in1943. Then John went overseas with the 326th FighterControl Squadron, 64thFighte r Wing, and for theduration of World War IIhe ra n direction-find ingequipment helping to gettr iangul ar fixes on disoriented fighter aircraftand vectoring them in tosafe la nd ings in Italy, Co rsica, France, and Germany.

John fi na lly got acha nce to work CW as anoperato r in Panama, buthe had to sign up foranother hitch in the AirForce to do it.

"We were se nt out to aplace called Rey Island towork in an ad minist rativenet handling CW trafficback to Panama," Johnsaid. " It was great, and Iknew I was hooked o n CWfor the rest of my life ."

John worked CW inGreenville SC, and thengot his best shot at concent rated CW operating in Ope rat ion Seminole, a jointArmed Forces field operation in Flor ida in 1947-46.The n he was shipped toEngland to operate CW atBu rtonwood in the Midlands. All this time, the little contact machines thatmade CW communication

38

•

Melehan Valiant, made in the 1950s. Th is is a favo rite keyo f John's, because you can set the vibrating arms for bothdits and dahs, the dahs being three times as long as thedits. Then both dits and dahs are made b y spring ac tion.

This is a 1912 Fla me Proo f hand key manufactured byMachinery Division, Boston Navy Yard. The key is ra ted at1-2 kilowatts. It is cast iron with brass hardware.

possible were facilitatorsto John . The c harm of thelittle devices hadn't ye tst ruck him.

The Berlin Airl ift of 1949taxed a ll parts of anairpla ne to the b rea kingpoint, radi o equipment included. John wa s flung into a ma intenance gap andhad to foresak e CW for awhil e .

" I worked my butt offrepairing radio eq ui pme nto n C-54s during part of thea irlift," John sa id, " but assoo n as 1 could , I sw itc hedback to operating CW andfini shed out the Berlin Airlift doing ground-to-a ircommunica t io n with weather ships over the NorthSea ."

John wrap ped up his AirForce ca ree r as ROTC radi o instructor at Ohio Unive rsity. Then he switc hedto the Federal AviationAgency, from whi ch he retired when he was FacilityCoordinat ing O ff ice r a tthe los Angele s Air RouteTraffic Co ntro l Ce nte r a tPalmdale CA.

It was at this final dutyin Califo rnia fo r UncleSa m that John fin a lly gotswe pt away by th e c ha rmof te leg ra ph keys - and ittook a woman to gathe rhim up. l o uise Moreau,now W3W RE, was living inCa lifo rn ia in 1971 andworking CW w it h herW B6BBO ca ll. Since shewas a prime collector of

t el e gr aph keys, sherespo nded to a ca ll fromt he lancaste r Radio Clubto speak about them. Johnsat in the audience andli st en e d and f oundhimse lf captivated by thelove and e nt husias m thatl ouise expressed for he rkeys.

"S he spoke wit h suc h excitement a nd inte rest, "Jo hn sa id, "that I couldn'thel p wanting to become akey collec to r. When I leftthe room tha t night, I wasa collector. "

A friend gave John a bigJa panese key a nd, as agesture of fellowship, Johnc leaned it up in o ne of hisno w- ro uti ne fi f t y-ho urrestoration projects, d rovedown to Altade na, andpresented it to louiseMore au . l ouise showed

him her key collect ionre presen tin g twenty yea rsof effo rt and encou ragedhim to get o n wit h his owncollecting. Th is he d id. andhe a nd l o uise have beenfr ie nds and cor res pondents eve r since.

Jo hn's wife Edie boughthim t he first key for hisown collect ion: a BostonFire Ala rm key which shegot fro m J,J, Glass Surp lusRadio in Los Ange les. Johnwen t to work on the key,soaking and sc rubb ing andpolishi ng un til every speckof fo reign material hadbeen removed . That keyamounted to free rein fo rJohn. He hit t he highway atevery c ha nce, scouring thewhole of the west coast forte legrap h keys. Edie caughtt he travel bug, too, andwent on nearl y every trip

John Elwood's well-used keying finger po ints to o il well onthe Ducrete and Roger (Paris) oil break ke y. Oil dampenedthe spark o f spark gap tra nsmitters. The key was a gif t fromEd Rasner W 2ZI, Trenton Nf. The gear in the background isJohn's R~391 Collins receiver.

This is a Signal Electric semi-au tomatic key that can beused as a sides wiper b y dropping a locking arm over thevibrating arm and closing the arms of the contact term inals.

39

This G.M. Phelps "camefback" leg key is from the1850-1860 era. The inventor, George M. Phelps, was thechief of Western Union at Utica NY. It was he who lruroduced the spring adjustment for this type key. Brass "legs"were inserted through holes in top of desk and the key wastightened down with brass wing nuts.

Here is a I.H. Bunnell & Co. "Sideswiper" double-speedkey. It requires only half the movement of an ordinary key.Advertisements claimed it eliminated muscle cramping.lohn turned down $100 offered for this key when it was ondisplay at the ARRL Convention in Hoflywood. In thebackground is an RM18 US Signal Corps Type 5001ABritish Air Ministry control unit, part of the SCR-575VHF/OF unit of the type lohn used in World War II.with him.

" If you see any kind ofantique store, junk shop,or radio store betweenOceans ide CA and Vancouve r Island , Canada.that looks like it mighthave a telegraph key in it.we've been there." Johnsa id. "And we've dug up alot of keys worth sav ing."

It wasn't long beforeJohn 's friends heard abouthis key collecting and,respect ing his zea l a ndpurpose, they ke pt theireyes o pen fo r keys. Abouttwenty of them have hadthe sat isfact ion of contributi ng to his co llection.

Once, in Portland OR,John and Edte went into alittle. out-of-the-way antique shop, and what t heyfo und made t heir trip asuccess. The prop rie tortold them he d idn' t knowwhat he had . so theyshould go into t he backroom and take a look.

"We looked," said John,"and found big boxes withan an tiq ue rad io stat ion int hem, eat's whiskers andall. But since I don' t co llec t radio s, we picked o uttwo camelback keys and aMarconi wireless antennakn ife switc h built by Crossand Hines, and we boughtthem and left."

John wrote a friend inCalifornia about the oldradio station. and thefriend went up to Port landand bought it. He got anextremely ra re Marconilo ose coupler, a ClappEast ham o ne- h alf- kwspark tra nsmitte r andrece iver, a ma rb le basedetector. a Colby loosecoup ler, and some UnitedWi re less gea r.

O nce, a t the Rose Bowlflea marke t in Pasadena,Edie, who John swears isclai rvoya nt re gard in gradio gea r. had a st rongfeeling that this would beJohn's day. She was right.

John found a man with awooden box of telegraphgea r for sale for fifteendollars. Among the contents were a MartinVibroplex, a Boy Scouttra ining key , threeMenominee leg keys, aBunnell straight key, andfou r Bun ne ll sounders.Jo hn paid t he man the fifteen dol lars and picked upthe box to leave.

" Hey," sa id the ma n,"don't take that box . Itdoesn' t go with that otherstuff."

As collec ting becamemore difficu lt, John beganadve rtising in the mage-

This Electro-Bug, made by Electro M fg. Co. of San Francisco, has a line magnet and works like a doorbell buzzer,attracting the vibrating arm and then breaking the contact." You can hold the paddle over and it will make dits allday long, " says W1GAQ.

40

This Horace G. Martin Rotoplex key built for the US ArmySignal Corps during World War II has a black cracklefinish on a steel base and is mounted on a Quarter-inch rubber mat.

This chrome-steel teardrop base semi-au tomatic keywas made by T.R. " Ted " McElroy in Boston. McElroy iscredited with the Morse code receiving speed record of75.2 wpm set in a tournament at Asheviffe NC on Jul y 2,1939.

Here is a German Baumuster T1 military key of the 1930s." This is my favorite hand key bec'ause the adjustments areprecise and the concave knob gives it a good feel, " saysJohn Elwood, who purchased the key from Louise MoreauW3WRE. In the background is John 's Hallicrafters SX.101 A receiver. That's John's precise fist in action.

t il he finds it. Then he reassembles the key and puts itinto his dis play case.Because of the time-consuming job of keepingbrass keys polished, John isnow thinking of coatingthem with lacquer.

John has an almostclinical attitude toward hiskeys - his patients . Therethey a re in all their spa rkling beauty. He has takenthem in, analyzed thei r diffic u lties, re pa ired them,and stitched them back upagai n as good as when

with Dupont chrome polish, washes them with soapand water, and dries them.Then he finis hes up thebrass with Happich Simichrome polish (German)and washes it with hot soapand water. On the steelparts, he uses steel wool,working down to fourought grade. He uses tapsand dies to restore threaded holes and screw threads.He has chrome- or copperplated parts re-c hromed orre-coppe red. If a part ismissi ng, he hu nts for it un-

The tbick-bese key in the fo reground is the fa mous" Boston" key made by Class-Eas tham Co. This key iscaffed a "Cad illac Class" key of the spark era by LouiseMoreau. The key was designed for luxury liners and theyacht trade, and every amateur wanted one. Behind it is aBoston Fire Alarm key, and to the le ft is a recent copy ofthe T.R. McElroy Professional Hand Model Key made byDaniel L. McElroy, grandson of the record holder, who ismaking them in honor of his grandfather. Out of focus inthe foreground is a Mecograph semiautoma tic key onceheaded fo r the Smithsonian until i ts owner, HowardLorenzen W3BLC, heard of John Elwood.

This is an Australian PMG vertical semi-automatic landline key made for the Postmaster General Department. ThePMG con trols all communications in Australia.

keys to John .When John gets a key

that is in rough condition,he applies penetrating oilto frozen or rusted screws,nuts, and moveable parts .Once the parts have loosened, he disassembles thekey completely and submerges all metal parts incarburetor cleaner to remove dirt and lacquer andget down to base meta l.Then he makes a cleaningpotion of one-third cupeach of baking soda, whitevinegar, and ammonia, andone cup of very hot water.He soaks al l brass parts inthis solution for twenty-fiveminutes, pol ishes them

zines of England and America . Half the world readsEnglish and American magazines. John found that theforeign countries have collectors, too, and they wereinterested in swappingkeys . Since John had duplicates of some types, hemade mail-order agreements with severa l hamsand, as a result, he gotsome interesting German,French, and English keys.Recently he has made contact with a docto r inBelgi um who collects keys,and t hey have worked out amutually worthwhile swapagreement. O ne ham inAustralia has traded nine

4'

._--------------------------they were created. Now it'st ime to think of them ashea led . They are we llaga in, and that's a fac t.Now he must get on wit hthe bus iness of loca tingand repairing others. Hefee ls he mu st be successfu l before collec torsw ith only a monetary interest in keys have collected t hem and takenthem out of range of t heham fra ternity.

John wishes he could

swap keys wi th more hamsin this count ry and abroad.He'd especially like to getthe m iniature Bunnell keyand sounder once used aswatch cha rms. He'd a lsolike to get a Vibroplex vertica l bug. He never sellskeys, though he has beenoffered as much as twohundred dollars for a sma llslde swipe r key. but he willbe happy to trade and willwork o ut sat isfac tory tradeagreements.

Not once did John speakof " my" coll ect ion. Heseems rather to conside rt he keys as the property ofeveryone . H is responsib il ity seems to him to be analmos t sac red d uty to getthe ke ys and make themnew again so that theworld will be able to seethem a nd know w hatpounded o ut m an's joys.sorrows, successes , a ndfai lures during a centuryand a half of incredible

prog ress 10 communication.

Also , John is preoccupied with that ultimatedeci sion he wil l o ne dayhave to make : Whichmu seum will di splay thekeys to the best adva ntageand take the be st care ofthem?

Whichever one he p ick s,that museum will someday find itself the keeperof a remarkable a nd interesting collection_.

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Proper FM Transceiver Adjustment- good club project

In search of the crisp signal.

Fig. 1.

' <0 6 ~2 0

,-<0>

':0><I

:0> , "M.0 '~"'SSU"O

II

• <0 S "10 'A~OIO

-.

A nyone who listens tothe great number of

rigs o n two or six meter FMthese days may wonde rwhy there is such a greatva riat ion in the qua lity ofsigna ls they hear . O neHW-2036 may sound clea rand crisp, while the nextmay sound distorted ,especially on audio peaks.

In almost 100% of thecases, the problem can betraced to either overdeviation o r off-frequency

operat ion, and sometimesa combination of both. Unfor tunatel y, most hams arequ ick to notice low audio,but few seem to point outexcessive audio .

If you ha ve been act iveon SSB or AM, you may askwhy these two items are soimportant to maximumrange when using the FMmode. If you take a moment and glance at Fig. 1,we will try to show you .

Fig . 1 shows an FM

t ra nsmitte r on 146.520MHz with a 1DOO-Hz aud iotone dev iati ng the carrierfrequency ±4.5 kHz, andbeing rece ived by a rece iver with an i-f passbandof + 5 kHz. (Please notethat an i-f filter se lectiv itycurve is not as sharp asdepicted.) As o ne can see,the on-frequency signal,with its 4.5 kHz of deviation, fits perfectly throughou r i-f filter where it entersthe FM detector and becomes a good clean signa lat the speaker.

Now let ' s move t hetransmitte r off freq ue ncyby 3 kHz and see wha t happe ns. This may not seemlike any amount of e rror tobe concerned about. butloo k at Fig. 2.

Since the receiver discriminator, or some formof FM detector, o nly converts to audio what passesthrough the i-f filte r doorway, o ne can rapid ly seewhy a good signal cansound d istorted when it's

only 3 kHz off frequency .As Fig. 2 shows, ove r 60%of the transm itted aud io o nthe h igh side is bein gc hopped by the filter andover 60% of the low-sideaudio is attempting to bedetected o n the hig h sideof the ca rrier frequency. Asa result, aud io distortionoccurs.

You may ask why a weakoff-frequency signal ismore noticeable than astrong local signal. Thetrue selectivity curve ofthe i-f is such that strongsigna ls b rute-fo rce theirway throug h the fil te r, thusnot aff ect ing the audioqua lity as muc h. The se lectivity of the rece iver isdirect ly proportional to thestrength of the signal beingreceived . This does notmean that if you are closeto the repeater you r frequency is not as critical.Remember, you r off-frequency signa l could be affect ing the user of the nextchanne l up or down.

44

O,S TOllTOON

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Fig. 3.

Fig. 4.

..-[r<

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- ( . - ------------ -----,

t ' SK H.

I AUDIO

, • .

The only solution to theabove is to adjust yourtransmitter back on frequency, or reduce yourdeviation 60% by backingaway from the mike. Thelatter is only a poor ternporary c ure.

Deviation

Sin ce the receiver i-fpassband can accept onlytho se signals that transmitwith in its 5-kH z limits, wemust make sure the transmitter does not exceed thisamount.

If you look at Fig. 3, it isvery apparent why overdeviation (±10 kHz) willproduce highly distortedaudio.

At a recent tune-up session at the KitchenerWaterloo Amateur RadioClub, some rigs were foundto be deviating in excess of15kHz. If you visualize thisamount of audio trying tofind it s way through aS-kHz filter, i t is no wonderwhy some signals were al most unreadable prior tothe tune-up clini c.

W ith the number ofrepeater frequencies already used in the Metroareas, the repeater council s have adopted a p lan tosp l it the channels andcreate new ones every 15kHz, thus placing a newrepeater pair between eachexi sting one. Because ofth is sp l i t, it is rapidl ybecoming very importantthat our deviation be keptat 5 kHz maximum.

Fig. 4 show s w hat happens when an over-deviating signal is placed on theair adjacent to one of thenew channel s.

This same ad ja centchannel interference canoccur if the transmitter isoff frequency, since it allows part of the signal tofall into the passband ofthe receiver using the nextchannel up or down.

The new band planadopted for use with thesenew sp li t or " tert iary" frequencies wi ll minimizesome operator err or in thefo llowing way. All new fre·quencies above 147.000w ill use low inputs andhigh outputs (reverse of thestandard high in. low out).This wi ll mean that off frequency and over deviationon a repeater input will notbother the adjacent input,only the output, so you willonly get pins in your coaxfrom your neighbors, notthe c o m p le t e repeatergroup. This will put all repeater operators in a persit ion where they will beforced into keeping thepeak deviation below 5kHz and off-f requencyoperation to less than 1kHz . If they wish to meetcurrent DOC (Departmentof Comm unicat ions, ou rFCC) com mercial specs,they should keep within 5ppm or 735 Hz at 147 M Hz.

Don't feel you wi ll haveto run out and buy a newsuper-select ive rig withthese new splits. They will

be issued about 50 mi lesaway f rom adjacent channel repeaters and shou ldnot cause a p roblem except on the older widebandrigs. Current DOC guidelines are 35 mi les betweentertiary f requencies, withsome as close as 5 mileswith no interference problems, so don't get upsetabout the new spli ts.

Frequency Adjustmenl

The best method for frequency adjustment is, ofco u rse, with a countercapable of 150 MHz . Acounter capab le of only10-15 MHz can also beused by read ing the actua losci llator frequency andcalcu lat ing the f requencyby mult ip ly ing by t henumber of t imes the rigmultip lies. For example, aGE Prog Line using a 6MHz t ransmit c rystalwould have an oscillatorfrequency of 6.1050 MHzwhen producing a 146.520output

If no counter blessesyou r ham shack, have a lo-

141 1 7'0

AO~AC E NT

CHANN[L' NTEllrrIlE

ca l ham lend you his receive r that is know n to beon f requency and uses adiscrim inator for FM detection . This type of detector,when properly aligned,produces a voltage relat iveto "0", either positively ornegatively proportional 10the amount of off·fre·quency operation. You aimply adjust your transmittertrimmer until the discriminator reads zero on themeter. A lot of the new rigsuse ra t io detectors, orquadrature detectors ,w hich cannot be used todetermine receive f requency u nless it is beat againstan accu rate i-f f requencygenera tor, e.g.. 10.7 MH z.

Anot her method to use ifno coun ter and no receivers w ith discrim inators areavai lable is to transmit avery weak signa l to aknown on-frequency receiver. Simply adjust yourtrimmer while talking intothe mike. The point whereyou r audio has the lea stdistortion shou ld be veryclose to frequen cy.

1411"

AO~.Cl NT

CHANNlLINU llf U EHCl

45

DeviationDeviation is normally set

by the factory before shipping. Unfortunately. 90%of the ri gs that get on themarke t appea r to be set at7.5 kHz . Almost all users ofthese rigs sound much better when they back off fromthe microphone. As we allknow. within a couple oftransmissions. we tend tocrawl back into our norma lmike hab its. The o nly solution is. of course. to adjust

the deviation as set out inthe manufacturer's instructions.

To set this control prope rly, o ne ne ed s a ca librated dev iation monito rwhic h very few hams, including myself, own. Thenext best way is with aweak signal into an onfrequency receive r, adjusting the deviat ion forbest audio. Have the pe rson adjust his sq ue lch atth reshold with no signal.

When you transmit, trvwhistling. If the squelch closes.you are exceeding the bandwidth of the receiver andshould back off a bit untilthe squelch does not c loseon peaks, It is very important when using this methodthat the signal be just fullquieting. ]-1 uV.

The commercially accepted level for adjustingFM d eviation is 4.5 kHz ofa ud io. This is measuredwith a 10DO-H z tone dri ving

the transmitter audio limite r stage into limiting.

So. as you can see, onedoes not have to mortgagethe house to invest in testeq uipment in order to havea good-soundin g signal on2 meters. Most of these adjustments, if set o nce, requi re very little attention.Because of thi s, there aremany genero us hams whohave the eq uipment anddon' t mind helping out aham in tro uble. •

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• Lightweight• High quality aluminum alloy• High stability• Modular and portable• Extremely rugged

46

Stirling M. Olberg W1SNN/ 9 Loretta RoadWaltham MA 02H;/

Dual-Band Smokey Detector- Super Scooper does it all

The battle goes on.

The " Smokey Detector,"desc ribed in the 1976

Holiday issue of 73. hasbeen the subject of muchmail received at W1SNN.Many have asked if itcou ld be used on the highe r frequencies found withnewer ty pes o f ra d arswhich ha ve been designedto imp rove ent rapmenttechn iques and decreaseconfidence in Smokey Detectors .

The author has learnedof new methods used to deploy obsolete police radaralong highway ranges usedfor surve illance . Newerrada r is used in conjunct io n wi th this method.wh ich is known in policecircles as "seed ing." Theo lde r radar units are se t upand left una tte nded so tha tthey " illuminate" st retchesof hig hway for manymiles-depending on thenumber of " seeds" that areused . Most of those unitsoperate on 10.525 CHz inx-band .

The newer radars, usua lly operated from a fixedpos ition. a re hand-held andtriggered only when the

48

device is pointed at a particular stream of traffic .The purpose of seeding isto keep the Smokey Detectors act ivated and , the refore, cause drivers to slowdown. Confidence is soondec reased in the SmokeyDetector, however. and theunsu spe c ting dri ver istrapped by the hand-helddevice . Yes, it works o nx-band. too, but too latefor a detector warning because the speeder hasmoved right into triggerrange .

But that isn't the onlytechnique used . Howabout this one: As before.seeding is used . Radarwhich has been des igned tobe used in ve hicles whilemovi ng is e m p loyed .These uni ts have a devicethat a rithmetical ly removes the vehicle speed,allowing the officer to pursue and record the speedof the car being chased .Here again. the police ca rcan depend upon the seedsto keep Smokey Detectorsoperating, and even whe nthe pol ice come in to rangeof ve hicles using detectors.

they can follow without detection . The new radar operates in the K-band regio n.Most of the older radar detectors will not rece ive att his f req uency ran ge ;again, confidence is lost.

The se tec hniq ues areused by large municipalities and sta te age nc ies forthe most pa rt. They can afford to ma intain the antiquated eq uip me n t fo rseeds . Ot hers will beadopting them, however.because of newer seedequipment that is beingmanufactu red by severa lcompanies at prices whichcan fit smalle r budgets.The newer un its are si mplya sma ll osci llato r and battery supply. The oscillatorwil l feed an ante nna thatfl oods an a rea with theosci llator's s ignal. Theycan be left unattended.fastened to st reet signs andstop-go signa ls . Othe rradar units that promisegreater control fo r policeagencies are in the works;the wa r is still on.

What can we do with ourradar detectors? Well . wecan update them to dete ct

the newer frequencies andlearn how to use the olderones to be sure that we aredetec ting an active radarand not a seed . It is not tooha rd to man ufactu re detectors that a re sensitiveenough to detect a seedingand radar entrapment, andthus provide a warning thatboth are being used. or towa rn that just a higher-frequency moving radar is activated . look at the blockdiagram of a dua l warningsystem which accom paniesthis article .

A ci rcula rly-po lar izedhorn coupled to a circu la rwaveguide is coupled to apair of crystal detectors.The detectors are mountedin cavities which suppo rtthe frequencies of interest.The larger of the two cavit ies is t uned for the X-bandfreq ue ncy, 10.525 C Hz,while the smaller one has astep ridge moun ted into itsEeplane coordi nate. Thestep ridge performs as atuni ng device that all owsthe smalle r of the two cavit ies to work o ve r the16.5- to 26.5-CHz range .There are seve ral frequen-

Fig. 1. Block. diagram, Super Scooper Smok.ey Detector.

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cies used in this range forhand-held and moving-surveillance radar units .

Coupling to the circularwaveguide is accomplished by careful placement of the two detectorswhich are mo unted in rectangu lar wavegu ide to provide coupl ing to the circula r mode.

Two preamplifie rs, onefor each waveguidemounted detector, amplifythe signal-which is the dccomponent of the detectedsignal. The amplified signalis passed through a CMOSswitch which serves as asignal mod ulator.

Eac h of the switc hes hasits own driving oscillator.An oscil lator at 1 kHzmodu lates the X-ba nd-detected signa l, and anothe rat 400 Hz se rves as theK-ba nd signal modu lator.

The outputs of the twomodulators are summed atthe input of an audio amplifie r that d rives aloudspeaker.

The resu lting wa rningsigna l will be two-tonedwhen both x- and K-ba ndradar units are detected. Ifjust the X-band detector isactivated, t he hi gh erpitched tone of the 1-kHzosc illator will be he ard.likewise, the 400--Hz signalwill be heard when a Kband signal is detected.When both are on, it is verylikely that you are in an entrapment area which iswell seeded. Bewa re whenthe hig he r- pitched tonestays on fo r long periods . Ifit is on fo r over 4,000 feetof dri ving, you are probably in a seeded area. If thesigna l conti nues , slowdown and watch fo r yourfriend in blue.

The circuitry illustratedhere is straightforwardaudio construction andcan be built on a smallboa rd using flea clips o rwire-wrap. No special atte nt ion is required. Thecompleted board must be

mounted so that the leadsthat connect to the detector outputs a re short-thatis, not over six inches long.Several adjustments to theelect ronics are requiredand will be described below.

The hardest pa rt of theconstructio n of the SuperScooper is its ante nna andcircula r waveguide. In theoriginal Smokey Detecto rarticle, instructions weregiven on how to constructthe horn antenna. This wasthe subject of many inquiries both as to its beamwidth and gain and relative to variations from thegiven dimensions. Fi rst ofa ll, the gai n of the antennais a pproximately 14 d Bover a re ference antennathat provided a 3-d B ga instandard. The gain standa rd was dete rmined in alaboratory using a sectionof ci rcular guide terminated in a matching impedance to a standard signalgenerator. A similar antenna was used with a detector and spaced one meterfrom the generator gainstanda rd and three metersabove the ground. Once alevel was determined bysetting th e signa l ge nerato rattenuato r to produce afull-scale deflect ion on thedetector indicator, the newantenna used on the SuperScooper was substitutedfor the transmitting horn,and then the attenuatorwas readjusted to producethe same fu ll-sca le re ad ingas with the reference ante nna. The attenuator differen ce was 14 dB at 21C Hz and 17 d B at theX-band frequency.

Since most amateurs willnot be able to dup licatethese dimensions, a patternshown in the drawi ngs hasbeen laid out so that itcan be closely duplicated .Several antennas were const ructed a nd measured ,and va riations from theva lues g iven were no twor t h men tio ning . Thedimension s were deformed

from true circular to ashape which occurs whenthe seam is so lde red. Not atrue circle, the variation ingain wasn't worth the trouble to measure. It is apparent that that wou ld takequite a departu re from atrue funnel shape.

The beamw idt h wasmeas ured, and it requ ired aconsiderab le amount oftime to determine that itwas a circu lar beam of 9degrees. Variation from atrue funnel shape doesdistort the beam considerably, so care inachieving the cone shapeshould be exercised. Thebeamwidth was measuredon a n an tenna range at thesa me laborato ry, using aquality of range equ ipmentprobably not ava ilable tomost amateurs . A ninedegree beamwidth is verysimi lar to that of most circular antennas used onpolice radars and shouldintercept most radiationfrom them.

To construct the antenna, it is necessary fi rst toacq uire a piece of copperflas hing so ld in most ha rdwa re stores. (B rass can beused but should be thi n sothat it is easi ly worked .)The sheet should be atleast 10" x 6" . With a compass , layout a 9-5/16" circleand, from the same center,scribe the second 'h " circle. (See the drawing.) Outside of the circle leaveenough metal so that thetooth-like section can becut and bent. Cut the sheetwith t in shea rs a nd flatte n

out all bends and dents acquired in the cutting procedure . Make sure that thetooth-like cuts are bent atright angles to the sheet,and then lay it aside.

Next acqui re a piece ofco nst ruct ion paper withthe same dimens ions as theflas hing sheet. l ay out thesame dimensions as befo re, but fo rget the toothlike part-just cut asmooth % " half-circle. Cutout the complete shee tso that it can be glued atthe seam tab. Now youshould have a cone thathas a mouth 3¥. " in d iamete r a nd a le ngth of4-1/16" . The opening at therear should be about %" india meter. I

Make up about two cupsof plaster of pa ris that isnea rly d ry but easi ly molded, and fi ll the cone so thata substantia l amount of itprotrudes from the 'h "hole. Shape the plaster sothat the cone is as roundedas possible, and set it asideto completely harden. Thisform will serve as a mandrel fo r the meta l ho rnwhen soldering its seam.Simply bend the meta laro und the fo rm a nd holdit in place with rings placedat several points on thecone. Solder the seam.Shape the metal and set itaside until the circularguide is finished .

The circular waveguideis made from a section of% " water pipe 3" long.l ay out the dimensionsshown in the d rawing. Measu re up a long the outs ide

49

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of the pipe and make twomarks to ind icate the widthof the cuts . They will be.250" wide and will support the K-band waveguidewhe n soldered in place.Make th is cut so that the.250" x .500" guide sits inplace in such a way thatedges of the guide matewith the H-plane walls ofthe K-band waveguide. Remove all bu rrs. (T he cutsare easily made with ahacksaw, but can be betterif done by a fri en dl ymachin ist and a mill ingmachine .)

No other cuts are needed in the circular waveguide, but its length is veryimportant. The e nds shouldbe square and free of burrs.It al so would be to yourbes t advantage to cleanthe pipe inside and outwith steel wool so thatsolder will easily tin themetal. Set the c ircu la rwaveguide aside for now,and proceed to d rill theholes in the E·pla ne d ime nsion of each waveguidesection .

50

Lay out the holes o n theX-band guide as shown inthe drawing . The crystaldetector mount ing for the40075 X-ba nd detecto rsho uld be a 3/16" d rilledhole o n the cente rl ine ofthe E-plane . Mark a point1111 6" from the smoothedend of the guide . Carefullyce nte rpunch a point fo r thedrill and drill t hrough bothwalls of the gu ide. Openone hole to 5/16 of a n inch .Place a section of 3/16"pipe o r tube, 3/16" long, into the other ho le.

(This pipe is found inmost model shops; it isbrass tubing used in modelconstruction. If you try tobuy it at a metal deale r youwill pay for a lot more th anyou need since the re it wi llbe a one-foot sect io n youwill have to purchase .)

Solder this sma ll piece inplace so that it is just evenwith the inside wall of thex-band gu ide . This servesas a connect ion fo r thesmall end of the X-banddiode. Now lay o ut the

othe r two holes in li ne withthe 5116" diameter hole,drill them. and tap for 4-40threads . Next, d rill holes located 3/4" from the B tuning hol e t h ro ugh bothwa ll s. Use a #36 drill. Onthe same side of the guidewa ll as t he detector ho les,open t he #36 ho le to a 5/8"diameter. Tap the remaining #36 hole for 6-32th reads . Deburr the hole inside and o ut. This hole isused to couple the circularguide to the X-band detector. Mount two 4-40x'h "brass screws in the holesmarked Band C and usenuts as locks for thesescrews. A 1!J" brass 6-32sc rew and nut is used forthe sa me purpose at pointA.

Next, layout the holerequi red on the K-bandwaveguide. This hole mustbe on the cente rl ine of theE-plane side of the wavegui de . Ve ry caref ullycenterpunch a point 5/16"from a smoothed e nd ofthe guide, and at this po intd rill a .187"..<J ia meter hole

through one wa ll of thegu ide. Deburr on each sideo f the hole. as on thex-band guide. Mount a1,4" lo ng piece of coppertube .250" in diamete r. Theends should be deburredinside and o ut. This pieceof copper se rves as theouter part of a capacitorand choke for the Keband1N53 detector d iode. Thecopper tube and the diodeare coaxially moun ted , soit is necessa ry fo r the tubing to be al ig ned so thatthe hole in the guide is exactly in the center.

The next step is to layout the 1/8" thick piece ofbrass which will serve asthe step ridge for theK-band waveguide. Layoutthe steps, cu t with a hacksaw. and smoo th with afi le. The steps are set sothat the bandwidth of theK-band ca v it y is quitebroad and will cover manyof the freq uencies used byK-band radar. De parturefrom the d imensions givenwill decrea se the sensitivity of the Super Scoo per, so

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RB2 unti l the other to nedisa ppears. This completest he elec t ro n ic adjustments .

The rf adjustments require t he use of two signalgene rators. o r your friendlypolice ca r. Apply a signalto a horn, o r other radiator.from an X-band signal generator. point the SuperScooper a ntenna towa rdthe generator, and use afairl y st rong signa l fromthe ge nerator. Adjust tuning with sc rews B and C a lternately for the strongesttone from the speake r. Touse an indicator. connec tan ac voltmeter across thespeake r leads and adjustthe sc rews for the greatestoutput. Now tu rn off theX-ba nd signa l generato rand rad iate a signa l from aK-band generator at 24.5GHz toward the SuperScooper. Adjust screw Afor the strongest signal.

The adjustments arenow complete, and so offto t he highway! You mayfind that radar used at air ports and milita ry baseswi ll be de te ctable . Theseunits are putting ou t verystrong signa ls and will satura te yo ur Supe r Scooper.It will take o nly a ve rysho rt time to learn how theSuper Scooper works.

No descr iption of thepackaging o f this device isgiven here. It is sufficient

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used in maki ng these connections. Be su re that thereis no power in the circuitry .Do not so lder to the d iodes ; solde r to t helug - and then o nly brief lyfor the X-band detectord iode-and do not solde rat all on the K-band diode.Use a diode clip o r make asmall clamp that contactsthe diode sleeve.

Assuming t ha t all of t heelect ronics has been const ructed as show n in thesc hematic di agram, it isnow t ime to test individualci rcu its .

The input circuits to t helM380 a udio amplifi er canbe used as an audio circu it tracer by disconnecting the jumper marked ABat the input of the volumecontrol. Connect a .01 capacitor to t his point anduse it as a probe to detectthe 1-kHz tone at the output of IC3, pin 3. Be surethe audio volume controlis half open, as the toneshould be present at thispoint. Also, you shou ld beable to detect a 400-Hztone at pin 3 of 1(4. If thistest checks o ut OK, reconne ct the jumper at AB.Now, pro bably, you willhear both tones. If so, d isconnec t p in 3 o f 1(4 andadj ust balance pot RB1 sothat t he tone nu lls o ut.Recon nect pin 3 of 1(4 andthen adjust balance pot

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so lder spa ri ngly on the inside jo int and ma ke itsmooth and clea n. butbu ild up the so lder on theoutside to strengthen t hejoint. Gussets may be added to the outside of thehorn and pipe, if desired .

Install the X-band diodeby fi rst slipping over thediode a V. " so lder lug anda v. " shou lder washer. Theshou lder should face thesmall end of the d iode. Insta ll a 1N53 d iode in theK- band moun t by fir stwrapping th e d iode oute rsleeve with o ne wrap ofSaran Wrap. whi ch se rvesas the d ie le ctr ic for thechoke capacitor. (For thepur ist: Use a single wrap of1 mil my larTM.) Whe n t hisdiode is insta lled. it shou ldbe pushed into the mou nting hole carefully so thatthe insulation is notscored. The center pin ofthe diode should engage inthe hole of the pin jackmounted on the ridge. A diode clip should be used toconnect to the shan k ofthis diode where it p rot rudes from t he coppertube . Use a razor blade toc ut away excess Sa ra nWrap o r mvlar!M so that theclip can ma ke contact withthe outer diode sleeve.

The diodes may now beconnected to the points indicated on the schematicd iag ram . Care must be

Fig. 3. Super Scooper Smokey Detector, cons truction details.

try to stay as close as possible .

Next, in the midd le ofthe second step from thetop of the struc ture, d rill ahole w ith a number 60 d rill.This hole must be on thecenterline of the step, andfall 5/16" from the end ofthe structure so that it willalign with the ho le in thewaveguide when the st ructure is in p lace. Removethe center conductor fro ma BNC chass is jac k[UG·1094/U). Cut off thesolder section so that thepi n is .250" long, a nd fil e itsmooth . Insert the cut e ndinto the nu mbe r 60 holeand carefu lly sol der intoplace. (Take care thatsolder does not fi ll theflutes on the opposite end.lThis pin serves as the connection to the center conductor of the 1 N53diode-a coaxial diodethat has a pin connection.

Slide the step ridge section into the waveguide sothat the pin is in the centerof the .187"-diame te r hole .This rid ge section must lieon the center line of the inside If-plane) of the guide.(It may be he ld in place bywood wedges while it isso ldered o n the bottom tothe wavegu ide wa ll.)

Now solder the X-ba ndand K-band de tec tormounts in place. The 2" circula r waveguide shou ld beinserted into the 5/8" ho ledrilled into the X-bandguide. The pipe should bejust through the waveguideso that it is parallel withthe inside wall of the guide.Solder in place. Also soldera 'h " x 1" cover plate onthe open end of the gu ide.Insta ll the K-ba nd detectormount and solder in p lace.Add a cover plate to theopen end of this mo un t,a lso .

Now slide the horn overthe end of the pipe andpress down the tooth- likeflaps so that they lie flat onthe pipe. Match up the endof the horn with the end ofthe pipe and solder thef laps to the pipe. Use

51

to say that the whole device can be enclosed in aplastic package -including the horn antenna. It isbetter to kee p these devices o ut of sight, sinceconfisca tion of them doesoccur in severa l states. Myunit lies o n the dash, looking through the window. Itis no t a pretty device anddoes not look like mu chmore than a batch of p ipeand a funnel. Eventually. Iwill e nclose it in a fog light

to be mounted o n the fron tbumper.

The diodes used a reava ila b le fr om seve ra lmicrowave semico nd uc tormanufacturers . Most o fthem cost too much for theaverage const ructor, so thebest bet is to get themth rough d istrib u t or s .Names of manufa cturerswho supply eithe r d irect orthrough d ist ributo rs appear in the reference at theend of thi s a rticle.

The requ irem en ts forsignal gene ra tors to tuneup thi s unit must be left toyour ingenu ity . The possib ilit y o f tun ing up o npolice vehicles is not toogreat, but it is a possibility.If gene rators are not avai lab le. it always is possiblesimply to try out o n theroad in hopes that you willfind a seed trap to tune upon. O r perha ps you couldbuild a gene ra tor. In anycase. lot s of luck!_

References

" Mob il e Smokey Det ec tor,"S. M. Olberg W1SNN, 73 Maga·t ine, Hol iday issue, 1976." A Complete x- aand Tran smit·ter.' S. M. Olberg W 1SNN, 73Magazine, August, 1978.

Note: Microwave diodes usedin this equipment are availablefrom Alph a Industries, SylvanRd., Woburn MA 01801, Para'metric Industr ies, tnc ., 742Main St .,Winchester MA01890,and Microwave Assoc ia tes,South Avenue, Burlington MA01803.

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to 30 MHz: coax, random wire, balanced line.Heavy duty encapsulated 4: 1 temte balun,

Glyes maximum power Iransfer. Harmonic attenuation reduces TVI . out of band emissions.

B1atk melal cabinet, anodized aluminum fron tpanel. flip down wire stand. 5x14x1 4 in.

500 pt, 6000 volt cap., 16 position dual Irduc

Order any product from MFJ and try it. " not delighted, return within 30 days for a prompt refund (less shipping). .... M52

Order today. Money back if not delighted. One year limited warranty. Add 58.00 shipping/handling.For technlcallntormatlon , o rd e r/ repa i r statu s , In Mississippi , o u ts ide c o n t in e n ta l USA, call 601·323·5869.

Order By Mail or Call TOLL FREE 800·647·1800 and Charge II On IZII!IIMFJ ENTERPRISES, INC. ~1~SI~~~:19~TATE.MISSISSIPPI 39762

V" Reader Ser.ice-see page 195 53

The LEADER In the rtorthwest!ATLAS. ICOM • KENWOOD . YAESU

Come to ABC Communications today fo r the best sol ution to yourparticular communication requirements, whether they be Amateur,

Two-way Business Band. VHF Marine or Police Scanner.

Kenwood 76252m FM Transce iver

DENTRON MT·3000ADeluxe Tuner

OENTRO N 160·10 AT (not shown)Super Tuner

KE;NWOOD Tr ansceiverTS-820S 160 thru 10M

KENWOOD TransceiverTS-5205 160 t hru 10M

Kenwood 76002m FM Transceiver

VAESU 901 OM

we also handle Wilson. CuSllCf.tt. Hy-Gain, ""Ienn.Specialist•. KLM. ere.A!lenllon Wa8tllnelon ...Idanll: Come on in lOt .~.cellenl ..,....lce In our complete Comm unications RepairShop .Write or center SPECIAL tower. rotor, antenna packagelTrl·Ex, RoIln, Wilson Towers. Shipping Inlo: F.O.B. seattlevia UPS, truck, or parc&l po$t.

Wnhlnglon ... I"'nt. add aal.a I...ABCCOMMUNICATIONS .". .....

ICOM-IC280

175!O In" ..VI .. .~ . . .... ..TTU . . .... l2IM5I "'-Yaesu FT101Z0

=_ 'M ~;;!;i

ICOM TransceIver 2M FMSSB ic 211

::;.;-:::::::

Other locations : (Walk-in customers only) . Bellevue - 12001 N. E. 12th . Everett - 4610 Evergreen Way _ Open Mon. thru Sat.

CALL TOLL FREE

e!

I-8OO-228-4097Co m m u n icat io ns Center

443 N 48th StreetLincoln, Nebrosko 68504

In Nebroska Call (402)466-8402

30.9589 .9534.9552 .9552.9529.9549 .9 5

49.95

Special239.95

79.9557 .0032 .9529.9569.9539 .9599.95

36.95109.9 5

42 .9562.9562.9534 .9559.95

Regu lar299.9599.9569.9539.9533.9589.9549 .95

119.9515 .9 517 .9 525.953 1.9559 .95

Specia l209.95269.95189 .9 5269 .9 5149.9 589.95

11 ere. 146 ·148 Mhz. beam22 ere. Power Pack2 Mtr . " Twist " 10 ele .2 Mtr . " Twist" 20 ele .2 MH . beam432 Mhz . 11 ele. beam430·436 Mhz . Beam

Hy -Tower 80·10 M venicalSO-10M Trap vertica l4O·10M T rap ver tical20·10M T rap VerticalRoof Mounting kit {verticals )80 ·10 M Trap doublet80·40M Trap doublet6 el. 6M beam3 et. 2M beam5 et. 2M beam8 er. 2M beam14 e l. 2M beamDelu xe ligh tning arrestor

Regular304 .75392 .75264.00392 .75197.00119 .9 5

18HT18AVT !WB14A VOIWB12AVO14RMO5BDO2BDQ66B20320520B21'LA-1

HY-GAINSpecial$239 .95

179 .9 5129 .95179 .9 5229 .95139 .95

99 .9 5179 .95

79.9569 .9544.9 5

169 .9515 .95

119.95

CUSHCRAFT289.95 2 19.95 A147·1189 .95 69 .95 A1 47·22

109.95 89.95 A144-10T39.95 32 .95 A144·20T36.95 32 .95 A147·20T39.95 32.95 A4 30-1 139 .95 32.95 A432·20T36.95 30 .95

MOSLEY3 el. 10 , 15 , 20Mtr .beam6e l. 10 , 15 ,20 Mtr .beam3el . 1O, 15 ,20Mtr . beam6 el. 10 , 15 , 20 Mtr . beam3el. lO, 15, 20 Mt r . beam40 Mt r, Add On

Regula r$299.95

229.95149.9 5229 .95289 .95169 .9 5119.952 19 .9 5

99 .9579.9554.95

209 .9515.95

149.95

HUSTLER3-TBA 3 ere: 10 , 15,20 MH . beam 259 ,95 189 .9 54 ·BT V 10-40 Mt r. Vertical 99.95 79.955·BTV 10 -80 Mt r . Vert ical 134 .95 99 .95RM-75 75 Meter Resonato r 16.95 14 .50RM·7 5S 75 Meter Super Resonator 31.95 27.50G6·144 B 2 Mt r. Base ccuoeer 79.95 59.95G7 ·144 2 Mt r. Base Colinear 119 .95 89.95

WI LSONS~tem One 5 ere. 10, 15,20 , Mtr . Beam 27 4 .9 5 229.95System Two 4 e le . 10, 15 , 20 Mt r . Beam 2 19.95 179 .95System Three aere . l a , 15 , 20 Mt r . Beam 179 .95 149 .9 5WV-l 10 ·40 Mt r . Ver t ica l 79.95 69.95

Super T hunderb i rd3el. 10 -1S-20M beam3 el. 10 -15 -20M beam2 el. 10 -15-20M Quad5 et. " Long John" 20 M beam5 el. " L on g John" 15M beam5 el ;"' Long John" 10M beam4 et. 20M beam5 el. conversion kit3el. 15M beam3 er. 10M beam2 et, 40M beamBalun for beam antenn as2el. 10·15·20M beam

Classic 33Classic 36TA·33TA·36TA-33 Jr .TA ·4QKR

ROTORSHamill $ 125.00 T2 X Tailtwister $ 199.95 Alliance HD 7 3 $1 09 .9 5

Call for prices on roto r cab le, Coa x, Towers, and Accessor ies. All pr ices do no t include shipping.

We carry all majorbrandsof ham radiosA T DISCOUNT PRICES

Yaesu - Kenwood - Droke - · ICOM- Dentron Ten-Tec - Swan - Tempo - Midland - E.T.O .- Wilson

ATB-34 4 ere. 10 , 15 , 20 Mt r. beamATV·4 10 ,1 5 , 20, 40 Mtr . VerticalATV·5 10 ,1 5 , 20 ,40 , 80 Mt r. VerticalARX·2 2 Mtr . Ringo Range rAR ·6 6 Mtr . Ri ngoAR X-220 220 Mhz. R ingo RangerAR X-450 435 Mhz . R ingo Range rA144 ·11 11 ele . 144 -146 Mhz. beam

TH6D X XTH3MK3TH 3JRH y -Quad205BA155BA.105 BA204BA204MKS153BA103BA402BABN ·86TH 2M K 3

18HT

", Readllf Service-see pagll195 55

INFLATION FIGHTEFROM O.I.S.M.O. ANO • •.

INNERSPACE AMPUFIER CORPORATION$100.00

DISCDUNTINFLATIDNFIGHTER

PRICE

$249.95

USER NET

IPS 30D

$349.95

IPS 15D

$299.95 $199.95

$100.00

______..:D:..;I,:.SCOUNT

.."

H"UI

$100.0 0

DISCOUNT

3OAOC lntern'"",,nt20 ADC Contlnuou'V.,..bIe Front P.nel Vol18118 Cotltrol3 ·14 VOC with 0111 ,\,1 Voltslind AMP RMdoul

IPS 15D15 ADC lntenn,""n! i_~~':':~::::::":~~~~10 ADC Contin UOUSV.riab14: Front PlInel Vohllge Control3 ·14 VOC WIth Dog tllli Yah,and Amp Relldout

$100.00DISCOUNTIPS 30D

$80.00DISCOUNTIPS 30M30 ADe Intermitten t20 ADC ContinuousVariab le Front Pe llel Voltage Con trol3 ·14 voe with II luminlted Voltand Amp Meter.

IPS 15M15 ADe In lermitlent10 ACe ContinuousVariable Front ParMI l Voltage Contro!3 ·1 4 voe with Illuminated Volt.00 Amp Meters

$80.00DISCOUNT---------

USER NET

IPS 30M

$289.95

IPS 15M

$239.95

$80.0 0DISCOUNT

INFLATIONFIGHTER

PRICE

$209.95

$159.95

$80.00

DISCOUNT

$60.00DISCOUNT

IPS 3030 AOC Inle,mittent20 ADC ContInuousInte rna lly Voltllge Ad, USlllbie

IPS -1515 Inlerminenl10 AOC Continuouslntemalty Volt&ge Adjus18b1e

USER NETIPS 30

$229.95

IPS - 15

$179.95

$60.00DISCOUNTINFLATION

FIGHTERPRICE

$169.95

$119.95

$60.0 0

DISCOUNT$60.0 0

DISCOUNT

~G" C.I.S.M.O. 1-800-845-6183 In s.c.call 1·366-71572305 Owry Road, Rock Hill, S.C.29730 (Exit 6&8 oH 1-77)

r--TOWER ELECTRONICS---.SAVE OVER $100!

An Offer You Can't Refuse • • •...." """ ", ,., ,.,., "".."""",.., " ,,,,,,,, .,,,.. " .. " .., ..,,, ,,..,, " .. , " t" 'n"' ..

'"",n....'111111'" ''

YAESU FT·101Z0 TRANSCEIVER

YAESU SP·901P PHONE PATCH

YAESU YD-148BASE STATIONMICROPHONE

· .. from Tower Elect ronics.The all-new Yaesu FT-101Z0 , proud

successor to the world famous FT- 1OlE !This unit is chock full of all the

featu res you have ever wanted such as :• Full coverage 160-1 0 meters.• Digital plus analog readout.• Speech processor .• Noise blanker par excellence.· .. plus interface with FT·901 series

components t

PLUS ...The Yaesu SP·90 1P Phone Patch ...

PLUS ...The Yaesu YO-148 Base Station

Microphone.

This Is a $1000 package at usualamateur net pricing - yours for only . . .

$8950 0

(Note : Send cashier's meek or money order and we'llship UPS Brown label same day order is received ATNO CHARGE TO YOUl)

24001 Alicia Parkway, Mission Viejo, CA 92675. Ph: 714fl68-8900 ~ T"HOURS: llJes.·Frl.: 10 a.m.·6 p.m. Sat.: 9 a.m.·S p.m. Sun: Noon-4 p.m. YAESU service & repaIr sped..I• •

•••••••••••••••••••••••••••••••••• TOWER ELECTRONICS 24001 AHel. hrkw.y. MI..lOf! VIeJo, CA 92175. Ph: 714n&8-81OO I• PtltYMENr BY; MASTERCHARGE II EXPIRATION DATE •

• CHECK B CREDIT 0 .viSA II •= (~~:~ ~denl~:~' SeIe, Tal OTHER =L___ NAME _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ I------J

• ADDRESS •• •• CITY, S TATE, ZIP PHONE .

• •• QIlerGoodTlrvu.y.1979 SIGNATURE •

•••••••••••••••••••••••••••••••••57

W1LSONMARK IV...

KDK 2016A

CPU 2500 R/ K

243-7765

!COM 1C701

,TEN IT.C OMNl·D

• • • ••....-; .r. ..~ to '" ., .

• RetaU Price Catalog• Monthly Compaterized U.ed Equipment U.t• Coarteoua. PenonaUzed Service

II

ToUIFree

KENWOOD TSS2lJS

------:-~~-CUSHCRAFT ANTENNAS

OVER 50 BRANDS IN STOCK

• KENWOOD • SWAN • KDK • DENTRON.• MOSLEY • WILSON • YAESU • DRAKE.• lARSEN· BENCHER. PIPO • BEARCAT.• B & W • DATONG • ICOM • PANASONIC •• ARRL PUBUCA1l0NS • ALLIANCE. MFJ.• CUSHCRAFT • TRAC • MICROLOG • CDE •• FlNCO • DSI • DAYBURN INSULATORS·• BIRD· ASTATIC. HAM KEY. REGENCY.• HusnER • SAXTON· TEN TEe· AMECO •• AMCOMM • CALL BOOK • KLM • TEMPO.• ATlAS· AlDA. COVERCRAFT. HV-GAIN •• J.W. MILLER • MURCH • PFENTONE.• SHURE • TAB BOOKS • SAMS BOOKS.• HOHN • BUTIERNUT • Plus Many More! •

* NEW AND USED EQUIPMENT"Get on our used equipment mailing list" ,* TRADES WELCOME"The best allowances anywhere""We buy good used SSB gear"

* FREE CATALOG"Prices of all major manufacturers"

* Sf'.ME DAY U .P.S. SHIPPING"Just a phone calf away"

* COMPLETE RADIO SERVICE SHOP"Mail Order Repair Service"• Fast Efficient Service . We Repair All Brands• All Work G uaranteed . Amate ur Extra /First ClassLicenses. Send Us Your Defective Equipment U.P.S .Collect e Please Include Manual a nd Power Supply• Free Shipping Both Wa ys If Work Is Done• Most Repa irs Done a nd Shipped Within 7 Days

OUR FINE REPUTATION SPEAKS FOR ITSELF

"YOU SHIP IT

WE FIX IT'

95 Kitts Lane, Newington, Conn. 06111 Connecticut Residents Call:

"Near ARRL Headquarters" (203) 667-0811

OPEN MON.-FRI. 10-6 • THURS. 10-8 P.M.• SAT. 10·4

EASY DlREcnONS: Rt. 15 South - 2 blocks past McDonald's(Berlin Turnpike)

58

A

New Equipment - All new equipment on display is operatingfor actual "on the air" QSO's . We really know our gear!

Used Equipment - We recond ition and guarantee all our usedequipment. We make sure it satisfies you!

~..,--

• ~"...,- - --'

~,

~

Service Shop - You've probably heard of our fine servicereputation - using Cushman CE4B signal generators, HewlettPackard oscilloscopes. Bird wattmeters - we fix it right!

Inventory Warehouse - Our large volume assures you thebest prices!

59

95 KItts Lane, Newington, Conn. 06111(203) 667.(1811

~1-800-243-7765

And Our Service Is Even Better! ~.

Give Us a CaD and See ~~< -se .,

For YourseU! :;'>' -:

.NI

. --'---• - - .i'- :- •

RF Speech ProcessorModel RF·440Increases talk powerwith splatter tree operation.RF clipping assures low distortion.

CommunicationsEssentials

NowfromJ. W Miller~DAIWACORPORATION

CN-620

..-.-;;..,-:,;-..- ,..~ ,

SWR & Power MetersMode's CN·720 and CN-620Simultaneous direct reading SWR,Forward Power and Reflected Power

Coaxial Switches2 posit ion / Model CS-2014 posilion/ Model CS·401

Available from these authorized distributors ...

PENNSYLVANIATrevose H..,.,t.-onie,Trevose (2151 357·10W0SOUTH DAIl;OTAWholoaale Elecl rotlleaMilchell (605) 996-2233

Bu'llhardt Amateu. Cente.WIl l erlown (605) 886-13 1.

TENNESSEEGermanlown Amateu. SupplyMemph ia l901••52-.216TEXASWholesale EI&<:I.onlc SupplyAustin (512) 478-9568Douglas Elec l.onlcaCorpus Christl (512)883-5103AG L Elect.onlcSDa llas (21aj241-U14Tracy Elec t.onicsf o rt Wo<th (8tn 292·3311Angie Elect ron ics SupplyHouston .'13) 8594l3ll6Eleetrole_Houston (713) 526-3-456totadison Eloctronic DiSl.ibulOlIHouston (7131 !568-0268Space Rad iO $I,opplyHou,'on (7131~59<IAppli;mco'" Eq...ipment CO_san Antonio 1512) 133-033<1.U.Ballard Supplysail u,ke City (801) 9n·2u:1VIRGINIA

'"Vl en~(703I938-33S0

WASHINGTONAmateu. RadiOSupplySeallle (2061 161·3222

19070 REYES AVE. a P.O. BOX 5825COMPTON. CALIFORNIA 90224

Exclusive USA agent for these units;inq u i ries invited.

MINNESOTANorth-est RoocI ioDuluth (218) 127-1565MISSOURIHam Radio C&nlerSI Lou is 131.\ m«l6ONEW JERSEYRoute Electronics~

To towa (201) 25&-8!65NEW YO RK

Gonosee Ra.dio '" ParisBu ffalo (716) 873-9661Harr ison Rild io COfll .Farmingda le (516) 2'113- 791lOBarry Eloc l .on icsNow York (212)WA!H OOOHarvoy Rild ioNew York (212)575·5200T '" M Electronic SupplyPatchoguo (516) 289-2'520Radio WorldOriskany (315) 337·2622Harr ison RadiO Corp,Valloy Stream 15161812·956SOHIOUn;W!l'YI Amaleur RadioReynoldsburg l61.) 866-<1261

seecce Elo<:lronicsDayton l513) 224-0871OKLA HOMARadio Inc_TulU 19181587·9123Krydiet Electronics0I<1aI'iOITIa City (oIOS) 189-1951O REGO NPot1land Radio SupplyPot1landlS03I~1

Pot1Iand Radio Sup plyModtOld (503} n 3-S815

OELAWAREDe la....... Amateur SupplyNew Castle13021328-1728FLORIDAHia leah CommunicationsHialeah l305l 887-5936GEORQIAAck Radio Su ppl yAtlanta (404)351-6340

ILLIN OISTriState Electronics Corp_Mount Pecepect (312) 255-0600Spec tran lc., tnc .Oak Pari< (312) 848-6118INDIANAG,allam ElectronicsIndianapolis (317) 630t-8202

Rode' eld Co .. Irw;.RIc hmond f3m 966-35re"'WA"hd .$li,te Dlslributi"llDes MOines (5151 2«-7231

KANSASAno<;~Ie<l RiodioCommun~tion.

Oorertand ~'" (913) 361.$00E'-<: lronlca, Irw;.58111\&(913) TA T·73T7

"-dio Supply$alina(913) 82~

Amateur Rad io SupplyWlchi'- (316) 264-9166MAINERad io Su ppl yAuburn (201)~.~MASSACHUSETTSvcc-ce-n ElectronicsNeedl\am (617) 449-1005Tull s Radio'" Elect.onicsMedfo .d (6ln395-8211OMI CHIGAN

Purchase Radio SupplyAnn Arbo'1313) N0 8.a696COmmuniCiltions Unl;m it&d, Inc.Canton (313) .59-5050RadloSupply'" Eng ineeringo.t ro,l l313) 435-5660

ARIZONAKryOo< Eloct ronicsPh""nl_ (SOl) 2.9-3739ARKAN SASu,.ondo.Olst.lbutorsTe xa.kan. (501)133·4631CALIFO RNIAHam Radio OutletAna heim (114) 761-3033Henry Rad io Co .Anaheim .714) 772·9200Eleetron lc C ityBu.Dank (213)842·5275Ham Rad iOOuliotBurlingame •• IS) 3-42·5757Sandy 's Eloctron ic Supplycanoga Pa'k {213) J.4&.83S3webs ter Rood ,o Inc,F.nno (209) 22.-5111HenlY Radio CO_Los Angeles (213\ UHI701T_ .. Ele<;\.oniclM ,u lOIl Vielo(71a1 16&-89OOlaGKoI Corp.loiIont..ey 1&081 375-31«uee Elect ronicsloiIountaln View (. 151 968-8894eon....yEIe<;I .OflOC S~ay (11.)S6E-5090

laGKi \ l5ac:ramenlo5ac:ramenlO (918) «6-3131Hem Radio OulletSan Ooego (71.1 Sll()-.49(lO

weste.n Red ioSan 01"ll0 (11.) 239-0361Ouement Elecl ronlcs Inc,San Jose (aoe) 996-5900Ham Red lo Outielvan Nuy, (213) 988-2212COLORADOCW ElectronicsOO....e. (303) 893-5525CONNECTICUTThomas COmmunicationsNewing ton (203) 661-0811

60

" )

J-i1L B -BODO

~__'''T 1M3} I L_'..........- ATe_ .... '7'0 a... _ 0.. r.::L

•

$595.00

Write today for HAL's latest RTrY catalog.

HAL COMMUNICATIONS CORP.Box 365Urbana, Illinois 61801217·367·7373

For our Overseas customers:see HAL equipment at:

Richter & Co. ; HannoverI.E.C. Interrelco ; Bissone

"~,

•• d. I ~~9fL'2400 Crysta l DriveFt Mye rs. Flo r IO;) 33907all crones 18131936·2397I ~ " I

JRN~

\~')~~~~O\J<,,~G_\~~<~~ C~5~6ndarO

..,.... <~ '\ . 2met ere-~..<' %- . Scanners

,,""(". Amat eur Bands~<:> .General Communication0" . Industry

~ • Mar ine VHF• Micro processor crystals

Send 10< for our latest Ciltalog, Write Or,pno ne tor more details.r: 1

-~. --.

MODEl:: V3SO

FOR BASE STATION&

REPEATER USE

.,; '1_ !... , r~::.- •' .- -

•

Hongod~_'_.TOP

• ' iblV1or _ ,," ' .." ...... s--:-~~2. kol<y..,.

11 • 8 • 13" ; 432. 203 . 3JO "'"'

Bene~ """"""'onu.R..-~RltCk M"""';no. 111" A dop ' or K,' IOPTION AU

SO·23\1-UHF

$895,00 FOB Factory

JOO Ws"o Outputcso W . ... Output400 w_.Output

_-iF> A C PoYver Su<>ptv, , 11!r.l3l1 V AC

_ .... , leW eooo•• Till -..

eooe_.. _ ...... .....IlO<IB-....Sp.;o,oo

10 _U.O'N1or 3150 _ ' HlGHl_ _ Al_s.o ~ ' ,Coo-=lioo, sse _ cw-'-Fl3ti orF23I!i ' ~ -.db....-....... FM_...... '

_..,n-mo-~""'F.,C<w>trol

• 13 V.... .. 3 _ on__

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3IIO'o400W_

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Con,..,...".. Outv

RF POWER LABS, INC. ~""

T...............eon......A , ' • 0uIp.n

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_a.-_

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USA !>fiee

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~""'''-01 o_ "",OutVCy cleGot.., Tvpic<O '

8 w _ """"12 W ...... lnpu<15 Walttl ln<>ul

SPECIFICAll0NS:

3/4 KILOWATT DC INPUTALL MODE VHF AMPLIFIER

r-------------------------------~I Ttv . "1b . h The fflclwJe, Orglln Corp.. Dept. 0 16 II sms couoonwt nngyoul e 43 W"t61.tStreet, New Y~ N.Y. l0023 II fascinating Schober color cata- 0 Please send mettle Schobel Organ 10: II log which describes the C?r~ans 0 ~~~iS $ l lorlhe 12-inch demo I

and shows you how easy it IS to record myI assemble them from Schober 's II Name I• comp lete

2~itsh' ' dnc lUde $1 if you Address I

•want a 1 -mc emo record . I

Ci ty Stale Zlp _

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You canassemble any of these~ '" Schober Organs

-and save 50% off store prices.

ECG_ ECG' ECG_ ECG_'00 • ,. ,. m ' .. ~ •0' • ,. '. ", ,. m •* • '. ,. m ,oo "' 'OO

* ' • '" .. m '" = 'x* ,oo ,~ .. m ,oo = 'OO- ,n '" '. m ' x ~ ..,* ' oo '. 'oo m .., M ,.* ,,, on • m '. = ..,- • ,. ' oo m 'OO ~ ..,m • - ,oo m ,oo ~ ,.- • •• •• .' ,. - ,.," '" '. 'x m • - ,oo'. • ,. '. m .. D ,oo•m • ,. '" m .. m ,"." '. '. " m ,. D '.'x ,. ,- 'x m '" - '"on ooo ... 'x m o. ,.. '.'x ". 'oo 'oo m ,. 'n ",'x '. 'oo 'oo 'x ,. '" '"'. ,. '. '. "' '" '" '00," ,oo ," ,.. m '. ". '.," ..' ,. x '" '" '" ...," ,.. .., ,. ", 'x ,.. ,..'. '" ,. • '" ,. n' ...'. '. ,- ,.. ~ , oo '" ••'. '. ,. ,. x, ,. '" 1.11," 2.01 ,.. '. m '" m ••m ", 'oo '. = '" '" ."," 'oo 'oo • ~ .. = '.,. • ,.. " . m •• = '",. ," ,n 'x m '" ", '"..' • .., ooo x' • m ".~ ,. ", . x ~ .. m •

• R·U-S-H,"'l1 o..der$ ShIpped S..... D'r R..,II""• FREE Freight on .11 prepaid Old...• EXClUSIVE 3 YEAR CONOfTlOt<tAl.. WARRANTY!• NO Min. Qrder-Ou.ntltr OIacounli A••II.bIe• bec:llC. , 0I0cle. In Stoct• LOI'Ig« H-. Mon-sat "·1~. Sun 1·7p• c.aor ....1oday-tD~ JtM ordIJf (518l& 33S7

Communications & T.V. UnlimitedDept n, 17 W..h lng ton SI~ R.n..IlI..... N.Y. 121«

DISTRIBUTOI'I INO UI RI ES INVITEDT.V.·C.B.·...MATEUR R...OIO·STEREo-MO NITORS-

ELECTRONIC P...RTS ..... C10S

lID YEARS WARRANTY!® EXACT Replacements for

SYLVANIA ~~ ..l~

ECG Transistor.Dlodes~Cs

SPINETCONSOlETTE IITl-IEATRERECITAL

62

ANTENNA SYSTEMS

TET Beams employ a hybrid system which combines separate full-size driven elements for each band with Hi-Q trapparasitic elements. The resulting antennas feature high radiation efficiency, 3 KW power rallng , and an excellent VSWRacross eu three bands.

MODEL 3F37DX 3F35DX- BAND 14 21 28 14 2 1 2 8ELEMENTS 7 5

~" ELEMENTS PER 20m 3 3"

BAND 15m 5 3-10m 5 3

ANTENNA GAIN 20m 8 . 5dB 8.0dB15m 10dB 8. 5dB10m 10dB 8.0dB

3F35DX FRONT BACK RATIO 2 5dB 20-25dBMAX. POWER INPUT 3kw 3kw

»> VSWR 1.5 (..r...) 1.5 (be~~.rf,

.> .' IMPEDANCE 50 rr 50 rr~//

- MAX. ELEMENT L . 10 . 5 m 10.5m~ BOOM LENGTH 7. 5m 5. am-»> BOOM DIAMETER 50mm 50mm

~- TURNING RADIUS 5.3m 5.25mWIND RATING 40m/ sec. 40m/ sec.- , SUITABLE MAST 50mm 50mm- I WEIGHT 23kg 17 kgI 3F37DX

,---" S W ISS QUAD VHF SERIES" - -,

5Q·22 TWO METER DUAL QUAD

The simple, lightweight 50-22 consists of a pair of twoelement quads on a single boom . Both elements of eachquad are driven with a phase difference between elements. The result is a two meter antenna with increasedgain and an improved front-to-back ratio when comparedto conventional designs.

SQ·22

•

KR·500KR·400KR·600:- -..,/,: I f,

~\ iii- ~ -

KR·2000

425 H ighland Par kway, Nor man, Ok lahoma 7 3069

Tel (4 0 5) 360 -6410 v"T E T U.S.A.v" Reader Service-see page 195 63

Dick Kelly W6BKYBox /4J7Campbell CA 9JOOS

The DXer's Secret Weapon- costs you nothing

Chart you r way 10 DXCC.

Fig. 1. Shaded areas show DX windows for my usual operating times. See text for details.

some connectors, etc., etc.,etc. Good grief ! Gettingseriou s about OX is goingto ru n me into seriousfinancia l problems! Therehas to be another way !

After some head-scratching and a little reading inbac k i ssu e s of h ammagazines (mostly 73), Icame up with a secretweapon for OX. With thissecret weapon, my OX cont acts went from a dozen o rso in twenty years of hamming to seventy-four in aperiod of less than sixmonths (no r counting XEsand VEs)! If 1 had beenmaking OX contacts at thatrate during my previoustwenty yea rs on the air, Iwo uld have (c an y oubelieve iH) 3,040 OX QSOsto my credit by now. OXCC,here I come!

" W hat 's the secret?" youask . " How can I get onet !"you continue. Well. youare in luck . I am going toshare my " secret weapon"with you for exactly what itcost me-nothing.

That's right, my weapon(show n in Fig. 1) cost notone red cent.

" You gotta be kidd ing: ' Ic an hear y o u saying ," that's nothing but a chartshow ing times in var ious

" So," I said to myself," you gotta get serious ifyou are going to work OX."

let 's see-p robablyshould get a l inear so I canrun a kW with the big guns.Gonna need a beam torep lace my forty/f ifteenmeter vertica l and thatmeans a tower with a goodbase and heavy-duty guywires . O h yeah, some coax,

. .." ", ',.. ...05 ·

- - - - .".- - --_ E Y~O PE_

through about m id-yearlast year, my tota l OX wasprobably less than a dozenco nt ac ts (incl ud ing XEsand VEs)-not an impressive record for some twenty yea rs of casual hamm ing. Which brings us tomy f irst observation aboutDXing:

Casual hamming doesnot produce DX contacts!

"'$.ICOI.. ' ~E ..ucl

-SOY ' " . .. € ~"._

,----- ,.,~U·~NO ox-----~ ------ " ( (I"OA t 0 )( - - - ---

-, -, -. -, , ., •• •• ., ." : '2 -".. .. 0. 00 " .. " .. '400 •• 00 '0" ~ .. ./'.. .../'... 00 " .. " .. " .. '... " .. .. ..

0.00 ->'... " .. " .. •• 00 ' " .. .... .. .." .. ->" .. " .. " .. " .. .... .... ..." .. ->" .. '0 " '... .... .. .. '... " .." .." .. " .. .... .,..E .;' .... ... " .. " .." .. • 0 ""' 0 " .. .. ,.- .... ... " .. ... '....... ."-'....~O •

.... " .. " .. " .. ... '0"" .... .... .... .... .. ... OAT T' ''E.. ..............

I

....E(OE~O [OP € U''' ~G

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... _u _ou [OH ...... G" OY. S

H aving recently (f inally) rec e i v e d QSl s

from all fifty states and app lied for my WAS award, Ibegan t hinking o f othergoals to pursue. OX cameto mind .

I have been a ham since1956, but, until a fewmonths ago, I had nevergiven m uch thought towork ing OX. From 1956

64

Connect to your receiver speaker, transmittermicrophone jack, and teletype machine and you're onthe air , State of the art design features make theTU·170 Ideal for HF and VHF auto slart operation.

• 5tablll aud io Irequllncy shi ftoscillator produces phaseCQhItnlnt sine wave tones

• 'rtt, co mpatible Inputs andoutputs for auxill iaryequlpmenl

• High IlWItl oulpul for scopeluning

TU-170 TU-170Kit 149.95 Wired 219.95

Watts input with a ve rt icalantenna . Actua lly, most ofthe OX ham s 1 work havebetter rigs tha n min e inthat they usuall y ha ve abeam of some kind . Whichbrings us to a no ther o bse rvat ion:

For working DX, the nextbes t thing to a time chart isa better antenna.

That is where my next investme nt is going. I figuret ha t a better skyhook is theabsolute best doll ar investment I can make .

I don' t know any big gunOXe rs pe rsonall y, so I ha veno t disc ussed my ide asabout OXi ng with anybodywho really knows how it'sdone . I do know th at myOX count has gone up as aresult of putting the charttogethe r and using it. Ifyou are a beginner at theOX game, it sure ly wo n'thinde r you any. So why notput togethe r a cha rt fo ryou r own t ime zone andgive it a try?!.

TU-170TERMINAL

UNIT

will be ava ilab le? The c ha rtshows that As ia and thePacific Isla nds wil l probably be in my DX window.This include s Aust ra li a,Ja pan, New Zealand, andRuss ia. I have found t hatt he Russ ians get up early toget o n the ai r, and theJapanese are o n t he air a llt he t ime (maybe ham sdo n't ha ve to work fo r a living in Japan !?). So, t hecha rt says that I can workYKs, Zls, JAs, and UAsafter din ne r d u ring theweek, wh ich is exact lywhat I do.

I am su re you get t he picture by now. OX is there tobe had, and the secret issimple:

Be on the air when DXstations are on the air!

"Yes, but what kind ofequ ipment doe s it take?"you as k.

Well, my experience hasbeen t hat t he average OXham is eq uipped with a ri gsimila r to mine: about 150

• Proved 170 Hz shl lt actlyefilter demodulalor

• Lighted luning meter loreasy tuning

• Current regu lated lOOP keyer& power supply

• '-"ut03tal wllh thresholdcontrol and soUd state relay

Prices good lhru June 30. 1979

t imes when they stay ali vea ll ni ght, but these timeshave been rare in my experience, so I can't de pendon tha t for OX. Be sidesthat, I li ke a good solideight ho urs of sleep everynigh t.

Armed with these twoassu mptions (which haveproven to be good enoughto d ramat ica lly improvemy DXing), I construc ted ac ha rt that shows my "OXwindows" to various partsof the world. Here a resome examples of how Ihave used the c hart.

let's suppose that I wa ntto work England . Let's su ppose, fur t her, t hat my timezone is Pacific Standa rd,U.S.A. (w hic h it is). lookingat the chart, we see thatEngland fa lls o n GMT (bydef init ion). Based on myf irst assum ption, t h eEnglish chaps are go ing tobe on the air fro m 'about1700 to 2000 during theweek. This pe riod of t imefa lls be twee n 0900 and1200 PST-righ t in themidd le of my work day!This mea ns th at I mu stwork Englishmen on weekends, which is exactly wha tI have do ne severa l timesre ce ntly a rou nd 1800 GMT.

He re is anothe r example.It has bee n ve ry d iff icu ltfo r me to work Africa.Looking at the cha rt, it iseasy to see why. Not iceth at the re i, o nly a twohou r window (19002000) dur ing my us ua lweekend operating ho ursand no window at a ll d uring my weekday o peratingho urs. It is obv ious that Imust get on th e a ir earli ero n weeke nds o r stay on theair la ter during the week if Iam going to improve myc hances fo r wo r k ingAfr icans. This illu strate show t he c hart can beuseful in p inpointing OXproblem a reas.

Let's take a look at onemo re example. Suppose Iwant to work some OX onWed nesday sta rti ng a tabout 1800 PST. What DX

places aro und the world."You got it righ t !

I am su re tha t my sec retweapon is no sec ret at a llto those guys who haveOXCC cert ificates hangingon thei r wa lls, but, fort hose of us who are OXnov ices, it can be a realdiscovery.

" Okay, how does a t imecha rt help with OX?" youask (if you are o ne of thosewho do no t a lready know).

"Glad you as ked that," Ianswer.

While t rying to think o flow-cost ways to improvemy OX abilities, I reasonedthat one requ ireme nt forworki ng OX is that the rehave to be some OX stations on the air fo r me tocontact. " Elementary, andobvious to the most casualobse rver," you say.

" Yes," I reply, " but theymust be on the air whenband condi t ions a llow contact between their pa rt ofthe world and my part ofthe world. "

"So," you say, "when areOX stations likel y to be o nthe a ir at t he same t imethat the bands are open?"You r ques tion ca n beanswered eas ily, but firstwe have to ma ke a coupleof assumptions.

First assumption: Hamseverywhere in the worldprobably have to hold somesort of jobs in order tobuy the groceries and paythe e lectrici ty bil l. Furthermore, they probably workabout the same hou rs t ha tyou and I work: 0800 to1700 local time, Mo ndaythroug h Friday. This be ingthe case, they probab ly geton the ai r du ring t he evenings and on weekends.(There a re some OX ha mswho get o n the a ir beforegoing to work in the morning, and I sa lute thosehard y souls and t ha nkthem fo r be ing the re .)

Second assumption: Thebands 1 work most -fo rtyand fifteen mete rs - willpro bably be open fromabout 0800 to 2000 localtime. I know that t he re a re

", Reader Service- iea paga 795 65

Foiling the Mad Kerchunker- frustrate him with this circuit

How to give ulcers instead of get them.

peater is st ill alive. A moreor-less quantitative definition (one that is necessaryfor this exposition) of a kerchunk might be stated: " Akerchunk is an unidentifiedkey-up (or transmission) ofshort duration on a repeater input frequency."Most kerchunks are wellunder one second duration .

With a decent definitionof a kerchunk, we may nowthink about how to designa kerchunk detector on therepeater . Once you havethe ability to detect thesestrange creatures, it's feasible to try to do somethingabout them . What a guycares to do depends beevilyon the situation, but let'slook at a few of the possibilities.

You can ignore them altogether if you can stand it.There is a minor questionabout the legality of continually repeating unidentified transmissions, butthat's not the point. Youcan listen to the kerchunking for a short time andthen shut off the repeater

"..001

" ";;lHOO

'"

,

• •1174 0 0

world is about kerchunkmg.

So what's a kerchunktAlmost everybody who hasoperated on repeaters forany length of time has apretty good idea, but thereare some who may not yethave been exposed to theVHF-FM equivalent of tuning up the HF-band rig onthe air without any identification . It's a pooroperating practice designed mostly to allow thekerchunker to see if the re-

),'

A. 8,C.OR,

,•

'"'"

00 '

li ilI " ' . n,,

709 0

'",,

• , '",I,

Fig. 1. Schematic diagram.

kerchunkers? Does thevery first one get youdown? Or does it take a fewto wear on your nerves? Orcan you stand it for hourson end? If you're in one ofthe first two groups, readon, but if you 're in the latter group, take a ride onthe Reading, and if youpass GO, collect $200 you deserve it for your patience . This article holdslittle for you except education about how grouchymuch of the rest of the

•

,

" ~I TT1... ER

,• 14 0 0"

,"00 '

• '0 ,.

'"

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Bill Wageman K5MAT/N5£E35 San JuanLos Alamos NM 87544

"',,,

Re pe a te r operators!Arise ! Fight back!

Show the cads you 're incharge! Stop getting ulcersbecause some refugeefrom the world of littlechildren is playing with histoy and kerchunking therepeater!

How do you feel about

66

for awhi le. This denies repeater access to everyone,of cou rse, but could resu ltin a certain amount of" peer pressu re" on t he guil ty culprit(s). You coulda lso, on t he first ke rchunk,meas ure the incoming frequency (assuming t here 's ad isc riminator o n the repeater), and t hen lock outonly those incoming signal s nea r that freq uency.This so lution is st ill notidea l, but it is already quited ifficult to implement unle ss you have a microp ro cessor-cont rol led repeater, so r have chosenthe midd le course.

let's suppose, for purposes of discussion, thatthe co nt ro l logic in you r repeater is TTL-compatib le.If not, you will have to usewhatever leve l shifte rs thatare necessary to make t histrue. Please note in t he d iscuss io n that I have assumed certain stated active s igna l levels-yoursmay have to be inverted.

So, somewhere you havea squelch-opera ted controlsigna l. I'm assu ming thatwhen the squelch is closedyou have a TTL high, andwhen it opens you have aTT L low. let me ca ll thi ss ig n a l 50 S· , fo r NOTSquelch-Operated Signa l.The overhead bar, o r t heword NOT, means the active signal is a low. If wecepacitivelv-couple 50S tothe inp ut of a 555 timer (or1;2 of a 556), that t imer wi llbe triggered whenever thesquelch opens, and its output will go high . If weNAND the outRut of thetimer with the 50 S itself,it ' s ev ide nt that if thesq ue lc h closes before thetimer goes low, we' ll get aTTL low out of the NANDgate . Thus we have a ke rchunk detecto r -if thekey-up is shorte r t han thetimer per iod , it's a kerchunk .

I have chosen to do twoth ings with this signal. It increments a co unte r a ndstarts another timer, whichI' ll c a ll the limit timer.

When the limit timer 'speriod is up, it trigge rs athi rd timer whi ch thenissues a short reset pu lse tothe cou nte r. We clearlydon't want to shut off therepeate r because it waskerch un ked once on eachof four consecutive days!

However, the o utput ofthe li m it timer is a lsoNANDed with anyone ofthe four o utputs from a7490 decade counter. If theo ne o utput is chosen, onlyo ne kerchunk is needed tocause the output of theNAND to go low. If thetwo, four, or e ight o utput ischosen, then it will taketwo, fou r, o r eight ke rchu nks during the limi ttimer's period to cause theoutput of the NAND gateto go low.

This s ignal is capac itivetv-coupled to still anothertimer, t he off timer. Thistime r gets se t when t heNAND goes low, and itsoutput stays high du ring itsper iod , w hic h may beanything you li ke . I haveNANDed t his timer's outpu t with a TTL controlsigna l I've ca lled KCENBl(Kerc hunk Ci rcu it ENaBLe).This is a signa l t hat must beprovided by you r cont ro lci rcuitry to enable (high) o rd isab le (low) the an ti-kerchunk circuit. If you don'twant to mess w ith t his sortof thin g, jus t tie that pin tovee t hroug h a 1k resistorso that the ci rcuit is alwayson.

The output of t his gatemight be ca lled OPR, fo rOPeRate. When t his output is high, t he repeater isal lowed to go on and offfreely wit h t he sq ue lc h,and when the output islow, t he repeater is d isabled . If you need t he oppos ite po lari ty to d isableyour re pe ater t ransmitte r,it's easy enough to run th issigna l th rough an inverter.Note that the fourth NANDgate in the 7400 can beused a s a n inve rte r fo reither t he input or the output signa l, if necessa ry.

There is a desi rab le

fourth connect ion to you rre pe a t er-c on t ro l lo g ic ,called RESET (NOT RE SET). A TTL low on thisli ne will rese t the off time rto zero, independent ofhow long it has been on(t he repeater has been off).This a llow s a cont ro loperator to immed iate lydefea t t he anti-kerc hunkci rcuit without disabling it.

Some of you are undoubtedly griping t hat rdid not consider part of mydefinition of a kerchunkwhen I designed t his circu it. I sa id a kerchunk is a nuniden tified key-up. So, inre ality, o ne shou ld checkto see whethe r o r not audiois present on t he signalbefore assuming it's a kerchunk. I chose to ignorethis aspect because I fel t itwas no t all that importa nt,it wou ld be easy to defeatw ith a Bronx c heer, and t hetim ing of the kerchu nk detector I used is so short t hatit is un necessa ry. If youhave read this fa r yo u probab ly have t he know ledgeto add audio detection ifyou want. That first gatecould be made into a th reeinput NAND gate and appropriate audio detectioncircuitry added.

The component va luesgiven in Fig. 1 are re co mmended as a first try andshou ld be satisfactory ifyou are actua lly us ing TTLlogic. R1 and C1 may haveto be increased to givemore re liable t riggering ifCOR is not a good sq ua rewave. R2 and C2 fo rm thetime constant fo r the kerchunk detec to r, whic h maybe a nything you like with inreason. Choose the Rs a ndCs for t he t imers by t he form ula t = 1.1 R C, where t isthe desired time in seco nds, R is t he resistance inOhms, and C is t he ca pac itance in farads. My ve rsiondefi ned a kerc hunk as akey-up of less than about200 ms , so any audio present is essentia lly irre levant.

R3 and C3 define t heli mit t imer period. I chose ava lue of a round 30 sec-

ends, but a lmost any reasonable pe riod t hat st rikesyo ur fancy is OK . The re se ttimer period is 10 microseconds and should be adequate for any TTL counter.

How long do yo u leavet he repeater off? R4 and C4determine this length oft ime, a nd I c ho se fiveminutes as a reasonable offpe riod .

It is desi rable to usegood e nginee ring pract iceswhe n bu ilding any logiccircu it, particu larly when itwill be used in what mightbe ca lled a host ile envi ronment. Be su re to do p roperbypass ing and shielding, o rglitches will be you r companion-cont ro l opera tor !Mecha nical re lays somewhere ahead of the circu itcou ld easily have contactbo u nce p rob le m s th a twou ld ma ke any tra nsmission appear to be a se riesof fast ke rchunks.

There are two prob lems Isee associated with the useof t his sort of t hi ng. It is notdesira b le to deny everyonet he use of the repeater justbecause someone is di scourteous to h is fe llowa mateurs. Some of t heworst offenders are likelyto get t he ir kick s by usingthis device to shut off therepeater so others can't useit! It is also undes irab le tohave a re peater " ke rchunked" off by a fluttering mo bile signa l. Ne ithe rof these problems is eas ilyso lve d u n le ss a mic roprocessor logic e lement isava i la ble-but tha t 'sanot her story.

I wo u ld like to t hankBob Cowan KSQ IN, trusteeof the l o s Alamos Amateu rRadio C lub repeater(WRSABU), who kindly permitted a shakedown cruiseof t his circuit, and t he c lubme m ber s a nd re pea teruse rs who put up with thewh ims of a guy who wanted to see if anyth ing sho rtof mu rder could effectively di sco urage kerchun king.Remember CRANK: Courteo us Radi o AmateursNeve r Kerc hu nk.•

67

·--------------- - - - - - - ------------Alexander M . MacLeanWA 2SUTINNNIZVB18 Indian Spring TrailDenville NJ 07834

Trends •In-

Surplusit's not what it used to be

Don't give up hope.

Rad io amateu rs reapedone of the f irst big

benefits from su rplus elect ronics. This bonus fi rst appeared after WWII, whenthere was lots of surp lusmilitary equipment on themarket, and lasted wel l into t he f ift ies. Many of t herigs sold only needed simple modification to gett hem on the ham bands.There were plenty of sma llparts avai lab le fo r t hebu ilder, too.

To a la rge extent, thishas changed. There is lessof the wartime surp lusavai lable, and the pricesare not a ll that great. Also,it is many yea rs o ld nowand behind the fie ld inseve ra l cases. We werespoiled by its simplicity.There is no equiva lent now.There just is not that muchmode rn su rpl us milita ryequ ipment fo r t he ham.And the pr ices are higherfo r what there is.

The sit uatio n lo ok sbleak. Actua lly, it looksbleaker than it rea lly is.There is plenty of surp lus

68

ava ilab le, but the field hasc ha nged. While there maynot be the drea m ri g jus twaiting to be picked up fo ra so ng, there are ent irecategories of worthwhilesurp lus tha t can be of greatben efit to the a mate ur.

It should al so be pointedou t that the amateur is nolonger the main user ofsurp lus. There are schoolsand industries, as well ase lectronics hobbyi sts, using surp lus now. It mayhel p someone who wouldlike to sta rt ta king adva ntage of t his to outl ine thema in catego ries of what isava ilab le a nd w here itmight fit into hi s p lans.

Many still think of surplus as be ing synonymo uswith military surplus. Thereis st ill milit ary surp lusavai la b le, a nd new ereq uipme nt bei ng released ,too, but probabl y the bigges t category of surplus isindustrial surp lus.

Le t ' s sta rt w it h t hemilitary. There are st ill theolde r tube rigs ava ilab lefrom the wa r and the fif-

ties. It is mostly the receive rs that are eagerly so ught,some o f them perhapsmore eagerly than theywarrant. You can pick up arugged , so lid ly-built receiver that will do workhorsese rvice for you . You ca nalso buy some th at are extremely hard to service. Forexample, the R-390 series ishighly regarded but difficult to maintain . Parts area real problem .

There are also a numberof tube-type compone ntsst ill ava ilab le. This goes fo rhigh-power projects and soforth . You may have problem s finding a reli ablesou rce for ine xpens ivesma ll parts for a tube projec t, though. There is somenewer solid-state militarysu rplus coming through,but at a higher price th anwhat makes surp lus buyingattract ive .

The next biggest ca tegory o f military su rpluswould be test gear. Youcan pick up some militaryversions of civilian gear ata low price. However, this

may not be what yo u need.Mu ch of this is lab-gradegear, wh ich sounds nice,but if it needs any sort ofservicing to be put back ino rder, yo u may have problems. You co uld wind upwith somet hing that yo ucan't even use. Here yo uhave to we igh you r troubleshoot ing experie nce andyo ur test ben ch.

It is schools a nd smalle rindustries that benef it themost from thi s if t hey cancheck o ut the ge ar themselves. They may wind upwith additional equ ipmenta t reasonable cost with theaddition of jus t thei r owntime and expertise.

In the same way, there isindustrial surplus of readybuilt test gear, too . Unlessit has been go ne over foryo u by the se lle r, yo u havethe same problems as wit hmilitary su rp lus. If it'doesn't work right, can yo ufi x it yo urse lf?

There are a few hiddenpitfall s with mu ch of thi sgear. A lot of the postwar

gear uses the early printedcirc uit boards. A lot of itreceived co nt inuo us-d utyse rvice. That a nd age havedone things to those PCboards.

When you go to work onthem, you may find thatth e b oard itself ha sdeteriorated to the pointwhere it ca uses intermittent problems (the foil maybe sta rt ing to peel), andthat adds up to a serviceheadache.

A lot of equipment is ofhybrid de sign -mixedtubes and transistors. Sinceit is precision gear, thetolerance is important. Bythis time it is long out oftolerance . The cos t to sta rtat the beginning and bringall the sectio ns up to tolerance may be so out of s ightas to be impossible. If thecos t doesn 't get you, thelack of av ailable replacement parts will.

The use of mixed tubesand tran si stors, particularly ci rcuits that mix bothtogether, represents a ca reful blend of the worstfeatures of both tubes andtransistors . That meansyo u will be trying to makean out-of-tolerance circuitfunction well. Hybrid circuits are more difficult toserv ice at be st. Often thesecircuits were riding right ont he ed ge o f a usab le sta teof- the-a rt tec hno logy. Theywere apt to have very littletoleran ce for variationeven when new. Trying toget them to function aso u t-of-to le ra nce circuitsmay not be practical.

The used , uncheckedpr ice may look very attractive, but can you fix it? Thec heck ed or good cond it ion(wo rking) price may not bethat good when comparedwith a new, o r kit, price forgear that may be s im p le r,but will do the actual jobyo u need. A rule of thumbwould be that you sho uldhave at least equal or better grade gear and expertise than you are trying tose rvice.

That's the part that looks

so bleak . Where is the nice,easy, and cheap part? Well ,it's all in how you look at it.There are areas which areele ctroni c he aven forthose who can use it. Theseare in the field of industrialsurplus. First of all. how doyo u feel about so lid sta te?This is where the action is.In fa ct, the val Lies here areoften even better than theva lues that are fondlyremembered from the lateforties and fifties.

Solid sta te is mostl y lowvo ltage. It also becomeso bso lete almost instantly.Manufacturers dump it bythe to n. Just two example s:A 1967 cata log li sted theSN7400 for $6.50 each andthe SN7490 fo r $2 3.20.No w you ca n get theSN7400 for about 16¢ andt he SN7490 for about 45¢.That's a few ce nts o n ad ollar . And those 1967pri c es had co me downquite a bit from the originalprices. In th a t f ield, individual so lid-state device sof a ll sorts ha ve beenpriced lower, and the sma llparts to go with them areavail able a t com pa ra b leprices. This takes care oftransistors a nd digital ICs,but th ere is more . Eventhough they are newer,consume r-oriented ICs areal so o n t he surp lus market.You ca n not only buy so meo f the o lder co nsumer fCs.but al so so me that a re st illin use co mmerc ia lly. Thisgives you whole sect io ns ofequ ipment.

You a re familiar with thea ud io a mps and preamps.There are also rf sectionsand specialized ICs avail able, and are they evercheap.

For what is available,yo u can often build a transistor or IC circuit for muchle ss than an experimentaltube circuit of the sametype . Power su pplies arealways a high-cost itemwith tube work . With transis to rs and ICs, there is somuch ava ilab le in partsand built supp lies that thecost is not a major factor.

There are lots of rf transistors and power typesavailabl e for the expe rimenter, so in that a rea yo ucan work with so me reliability.

Whil e tube part s a rehard to come by, thi s isreally only in one area.Old-style tube thinking isexpens ive, but there is o neway th at you are ahe ad oft he game. Take advantageof the state-of-the-a rt intubes. What? You did n' tknow tubes had cha nged?Then you haven ' t had towork with TV sets muchlately.

There is a lot of tubetechnology des igned foruse in TV sets. This hingeson a line-opera ted supp ly(most ly wit ho ut a tra nsformer) of about 100-200vo lts. The TV tubes arebuilt to work well in thisrange . There are lots ofmodern compac tron multisec t io n tubes that hamsand experimenters haveyet to tou ch. And thebenefit s from them aregreat. There are plenty oflow vo lta ge parts forreceiver and TV repl acement use around, even insu rp lus. There are a lsomany power supp ly transformers a nd parts ava ilable, too. This puts a tubec ircu it cost on a par withtransistor work. The initialcap ita l cos t for bench su pply and so me parts will beslightl y higher, but o nceyo u have them, yo u havethem, a nd the difference isonly a few doll ars.

So you still have the option of going tube or transistor at a reasonable experimen ter's price. Keeping to re ceiver vo ltagelevel s is the key. O nce yo ugo abo ve t hat vo ltagerange, the price goes upfast.

There is st ill more . Thereare a few areas of specia lized sur p lus to explore.The comp ute r field did notjust dump a few measly ICson u s . There is al s oread y-built co m p u te requipment. To name a few

items, there are power supplies, keyboards, video terminal units, and whole sections o f sta nda rd businessequi pment or iented towards computer interface .If yo u know what it is andwhat to do to ge t it going,the re a re ba rga ins fo r theknowledgeable .

The re are some o therareas of com me rcia l su rplus, too. These are moreconsu me r-oriented . Manybra nds are re all y the sameo r si mi la r e q uip me n tbought fro m o ther manufactu rers. The re a re lo ts ofhi-fi-tvpe com po nents a ndsemi-complete eq u ipme ntth a t ca n be utilized with litt le work. These pr ices areoften qu ite low.

In sho rt, there is a not he rrena issance of su rp lusu po n us, bu t the times a ndtechno logies have changed.With some wo rk to updateand upgrade you r basice lect ronic kn owl edg e ,muc h is adaptable to hamo r other experi me ntal uses.There a re a fe w gaps t hatmake it a bit rou gh o nso me types of building.These make it seem asthough there is no t mu cha vailabl e for buildin g .Ham s in parti cul ar arebothered by this, as certai nkey ite ms a re just not rightat hand at su rp lus prices. Abig headache is tu ned c ircu its. It is hard to get theco il stock wh ich used to bea part of eve ry p roj ec t. Theslug-tuned coils a re hard tof in d , too . Th er e a resou rces, but the price is ata premium . There are waysaround thi s; however, t he reis anot he r problem.

The othe r half of thetuned ci rcu it is a va riab lecapaci to r. The usu al smallva riab le with a shaft for akno b is not th a t commonor ava il abl e t hese days.This make s a ll sorts oft uned ci rcu its fo r receive rsand transmitters hard tobuild , part icularl y wh en anautho r uses a spec ific partin a n a rt icle. There arewa ys thi s might be eased .There are eas ily-ava il ab le

69

sou rces fo r toroid coresand information on usingthem in circuits . They arenot t ha t common in construct io n art icles, though.

Tuning can also be don ewit h va racto r di odes inmany circuits, bu t th is isa lso not commo n in manya rticles . Ot he r parts area lso not com mon. Themodern i-f st rip parts, suchas crystal or cera mic i-ff ilte rs, whic h a re quitecheap fo r ma nufacture rs,have not shown up o n thesu rplus market. The sta nda rd receiver l-fs. in pa rtic ular, a re hard to comeby. Even the o lde r-sty letra nsisto r i-f t ransforme rsare no t commo n items.Many const ruction a rt iclesuse very expens ive a ndhard-to-come-by filters fo rco nst ruct io n . There a refew simp le alternativesgive n. Power stages arealways a problem. Whenthe voltage or power goesup, t he price goes up and

the item becomes hard tocome by.

So me ham items havebenefited from all of thistechnology. The frequencyco unte r as a ham item is sonew that it is still co nsidered exotic, and yet inthe few years since it hitthe ham market, the pricehas dropped steadily. Atfirst, they had to be homebuilt to get any pri cebreak, and they were fairlyexpensive then . Now youcan bu y kits and readyb uilt units for less than youcan bu ild your own.

A counte r that wouldhave cos t industry thousands just a few years agocosts a ham a few hundred.A less-costly unit will st illbe more accurate than anyfrequency standa rd available to hams up to now.

However, we st ill havethe problem that our basicpurpo se, co mmunicat ionseq uipment, is not so easilyse rve d by the su rp lus

market. The nearest thingto it is the conversion of CBgear to ten meters . Thatmay catch on in quantity,but in the meantime it'smore symbolic than a major force.

This apparent lack inmodern surplus should notreally be such a majorproblem. What it means isthat we have not yet solvedsome of the technical problems in utilizing what isavailable for our morecommon amateur uses.

This is what is ca ll ed aculture lag. The material isthere, but we have just notfully adapted it to our purposes .

It would seem likely thatin the next few years therewill be some breakthroughin the use of modernsurplus that will bring atime of simple but effective home-brew ham gear.This will probably have aneffect not unlike that ofthe coming of the available

frequency counte r. In particular, it will put equipment within reach of manywho are not able to spendmuch to get started. Thereis very little simple ruggedequipment at a beginner'sprice, particularly equipment that can compete inreal performance with thesto re-bo ught.

That's the big problem.Even for the same money,there are few who couldbuild a receiver that wouldactually work as well as acommercial kit or readymade unit.

Better utilization of theavailable surplus now, a ndwhat may become ava ilable in the next few years,should produce projectswhere the cost, complexity, and ava ilab ili ty vs. performance ratio sho uld befavorable enough so that itwill be a tangible inducement for many more hamsto build some of their gearagain .•

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V'" Reader Servlce-sH page 195 71

Robert Glaser N3/C3922 Algiers RoadROfldof{stowfl MD 2/J33

An 8080 Repeater Control System- part IV: addenda

2#1 MessageYou are hearing an amateur radio repeater . Very simply, a

repeater consists of some electronics equipment whichboosts radio communicati ons range. A repeater has a receiver and a transmitter operating on different frequencies.They uti lize antennas located as high up as poss ible.Because of the high location and very good quality equipment, repeaters can receive transmissions from much further away than can be normally done and can be heard at afurther distance than Iscommonplace.The repeater ret ransmits weak signals, permilling walkie-talkies and mobile etatrona to communicate with each other up to a hundred milesapart or more, when without a repeater, the range may be onIy several miles or several tens of miles.

Repeater operation Is but a small part of what Is availableto the radio amateur, or ham, as he is commonly called .Hams routinely talk to other hams around the world on theshortwave bands . Some operate the internat ional Morsecode and others use single sideband, a modern form ofvoice communication. Many hams operate radioteletype,and some even transmit pictures across continents. Thereare some amateurs with test-scan television stations oftheir own.

Ham radio is a fascinating hobby. Some hams like to buildequipment and some just like to talk, but most do a little ofboth . Hams keep up wllh the ever-growing technology of today. Amateurs built several sate lli tes, had them placed intoorbit, and can now easily commun icate through their veryown sate llites, called OSCAR (for orbital satellite carryingamateur radio). Some hams even have homemade computers completely running their stations!

Amateurs have a lot of freedom to operate on the air andbui ld their own equipment. This is because each and everyham must demonstrate to the Federal CommunicationsCommission before receiving a l icense that he has an understanding of both radio law and electronics theory in additionto knowing the internat ional Morse code.

Ham radio is both a fun and an educational hobby. If youthink that you could develop an interest in ham radio, contact the Baltimore Amateur Radio Club at PO Box 5344,Baltimore MD 21209. Or dial H·A·M-T-A-L-K, HAMTALK, onyour telephone for further information.

This has been the two-pound-one message. Two-poundtwo gives general informat ion, two-pound-three suppliescurrent club information , and two-pound-tour explains moreabout the repeaters.

Listing 1. The "old code" command.

Severa l addi tions havebeen made to the co n

t ro l system. The LM3Q9Kregu lator Ie in the + 5-volt

power supply has been rep laced w ith an LM 323K-5,w hich has a h igher cu rre ntrati ng. A n "old code" com-

m and has been added t othe program, the MohawkM e ssa ge Re pe a te r hasb een swapped for a standard 8-trac k player, and at el epho ne switc hove r network has been added toshare a sing le te lephonel ine w ith two rep eaters.

The O ld Code CommandThe Bal timore Amateu r

Radi o Club c hanges itsau topatch access code annua l ly. I added the o ldcode com mand t o m ake itc lear t o users that theirt o u c hto n esI w ere accep ted , but that the o ld access code was used and nolonger acti vates the autop at ch. W he n t he o ld codeis used, afte r the ca rrie rdrop, the control systemsends "OLD CODE" in CWo

OLDeO: CALLLXICALLJ MP

;;;OLOMS: DB

DBDBDBDBDBDBDBDBDBDB,,

••CODTB : DB

DBDBDW

The p rogramming is simple. and Listing 1 showsthi s rou t ine. The routineca lls WCD, load s the HLregi sters w ith the messageaddress, and CW is ca lled .In the code table, the o ldaccess code now points toOlDCD.

The Tape LoopThe tape m ach ine de

scribed in Part I developeda prob lem, and the o pportun ity was taken to repl aceit w ith a common 8-trackt ape player . Th is is mostsu i tab le b ecause a loopconf iguration is requi red.The primary d rawback tothe Mohawk Message Repea ter was that the recorded message had to be exactly as long as the tapeitself. The new system is

weDH,OLOMSowTTON2

80H ,SPOFOR ,04BH IL90H ,080H ,SPOA 8H ,eOFOH ,090H ,n40H ,E80H ISPo

,•12 1tOLDcn

~ 72

21'2 MessageWelcome to the Baltimore Amateur Aadio Club's 07167

repeater, WA3AFM. The transmitter is located at the oldWBAl tower on Park Heights Ave. The repeater has receivers north of the beltway on Old Harford Aoad, at the WRBStower near 195 south and the beltway, downtown at 4000North Charles Street , at the QTH 01 K3VC and N3JC at thetop of the Jones Falls expressway, and a f ifth receiver inRandallstown. A voting selector feeds the best signal to thetransmitter.

At the transmit site, there is also a duplexed 44O-MHzrepeater, 444.35 in and 449.35 out.

You will note that a short click is heard after releasingyour carrier. This signifies that the repeater timer has beenreset and leaves t ime for breakers . It is not necessary to letthe repeater carrier drop. 07167 has an autopatch limited totravelers and club members, t hough open to anyone foremergency traffic.

The repeater is set up to block touchtone signals fromrepeating. There are several codes that anyone is welcometo use after proper identif ication. One-pound-one links the67 machine wit h the 440 repeater. To acknowledge thatfunct ion, the repeater senefs an "An in Morse. The repeatersremain linked until a star is sent , again acknowledged withan "A" . Two-pound-one plays a tape giving a brief rntrooucnon to ham radio. Two-pound·two gives th is recordedmessage. Two-pound-three supplies current c lub tntormation. rwo-pouno-tcur gives more Information about ourrepeaters. Tape messages can be activated at most onceevery ten minutes. Three-pound-t hree will disable therepeater'S blocking function untutne carrier is dropped, permitting the tones to be repeated. Any touchtone digits sentafter four-pound-tour will be verified in Morse after the carr ier drop. stve-pcuno-uve will repeat what was sent during afour-pound·four operation, or the telephone number dialedduring an autopatch, whichever was last.

The contro l system lor the repeaters Is an 8080-basedmicroprocessor which performs the various functions, in cl uding multiple identifications as well as red ia ll ngte lephone numbers for the autopatch.

The Balt imore Amateur Radio Club has another two meterrepeater , 34194, wh ich is a spli t-s ite repeater in t he NorthernBaltimore area. We hope you eoloy the use of our repeaters,and we would like to see you at our meetings the first andthird Wednesdays o f the month at the Ames MethodistChurch in Pikesville at 8 pm. listen for interesting bulletinsweekdays on 61 at 7:30 am and rebroadcast on 94 at 6 pm.Code practice can be heard Mondays at 9 pm on 34194.Should you desire to contact the club, write the BaltimoreAmateur Radio Ofub, PO Box 5344, Baltimore MO 21209.

2#3 MessageThis is the two-pound·three message. Two-pound-one

gives an introduction to amateur radio, two-pouno-twc supplies a generalized message, and two-pound-tour providesinformation about the repeater equipment.

Th is repeater is sponsored by the Baltimore AmateurRad io Club, PO Box 5344, Baltimore MO 21209.

Where is the current OXped it ion? What is the WWV prcpa.gat ion forecast for the upcoming week? When is the nextlocal ham fest ? To f ind the answers to these and other cuesnons. l isten to the BAAC bulletins weekdays at 1:30 am on01/61 and at 6:00 pm on 34/94. Keep up with your hobby.

(In CW at 35 wpm: Hams constantly strive for proficiencywith CW.) Code practice sessions are held on Monday evenings at 9:00 on 34194. Call In your requests next Mondaynight and test or improve your code speed.

Remember to dial H·A·M-T-A-l-K, HAMTAlK, in theBaltimore area for current Information. Spread the numberaround to your non -tram fr iends.

Don't lorget to wri te an article or two for the clubmagazine, the Modulator. If you can help out with amateurradio cresses. contact W3HYY.

Is there something that you can do or suggest lor thec lub? Come to some meetings and volunteer-we'd love tohave your participation.

BARC meetings are he ld at the Ames Methodist Church inPikesville at 8 pm. Business meetings are held the f irstWednesday o f the month . General meetings inc lude apresentation and are held on the th ird Wed nesday 01 themonth. Everyone is welcome at both meet ings.

The September meet ing will be a discuss ion of spark-gaptransmission and ham radio of years past . The OCtobermeet ing will be a tour of the Emergency Medical Aadio Ser vice at Sinai Hospital . November's meeting boasts a talk onradio-controlled models. The January meeting will be tne annual BAAC auction , the February meeting will have demonstrations of antennas and their patterns, and the Marchmeeting will be all about our repeaters. Try to Join us atthese meetings , if possible.

more versatile and allowsthe message to be anylength up to the le ngth ofthe loop itself . Since thetape player is stereo, it isconvenie nt to p lace themessage aud io o n the rightchanne l and a tone o n theleft c ha nne l to ind ica tewhen the message is finished. Standa rd 4D-minutetapes su pp ly 10 minute sper track . The cont rol circuitry activates the d rivemechanism upon request,and whe n the message isdone a nd the tone is en-

countered, the tape systemdisconnects itself from therepeater and continuesrunning until t he metallized strip signifying thebeginning of the tape isre ached, shutti ng off t hemachine . A bonus is thatthe ta pe s can o nly be act iva te d once every tenminutes. A KILL comma ndha s been added to a llowtermination of the ta pemessage when desired .

The tape player has fourpai rs of t racks, so t hisfeature was exploited to

provide four d ifferent tapemessages. The o riginal single 2#2 tape request is expanded to fo ur, accessib levia the codes 2#1 . 2#2. 2#3,and 2#4. The microprocessor re membe rs which trackthe tape player is on andadvances the head a ssembly to the requested tapetrack . The 2#1 message isfor non-hams. It briefly explains what amateur radiois all about and is usefulwhen someone asks whatyou r handle-talkie is fo r.2#2 is a shortened versionof what it was befo re. 2#3supplies current club informatio n: net schedules,meet ing progra ms, etc . There lat ive ava ilability ofa-trac k re corders permitsmont hly updates to bemade. The 2#4 message is amore detailed desc riptionof the repe aters.

Fig. 1 shows the tapeloop inte rface. This ci rcuitry is bui lt into a minibox and mounted to thetape player. The only connection between the tapeplayer and the control system is the 16-pin DIP plugas before. The tape playeris a standard 8-track designed for automotive useand operates from a12-volt power source. Acoperated players could beused with the addition of arel ay to connect the unit tothe ac li ne from a 12-voltcoil. The circuit is quitesim ple. Relays K1 and K2p rovide t he switc hi nglog ic. Normally, both rela ys a re de-e nergize d .When the sta rt pu lse fromthe processo r grounds thefloating half of t he K1 coil.the re lay pu lls in . TheSENSE contacts on the

73 ~

,INITIALIZATION PROCEDURE TAP4: MVI B, ), J"" TAPC, ••BEGIN: XRA A ,

ST> LeXR ,INR A SEEK: LOA TRACK ,SEEK ADVANCESSTA TM.CP; ,TRACIt • CPI • :HP-AD TO TRACK

RESET: LXI H,TIME-' JC SEElt2 :SPECIFIED, SUI • ,IN REG D, SEEK1: STA TRACK, J>'P SEEKORr. 2000H ,THIRD ROM $££K2: MVI A, )

TAPE't MVI B,O , TAPEX PLAYS C!"!P BTAPE: LOA OUTOM ,THE TAPE ON RC

ANI 2 ,1'RACK X LOA TRACKJR, ITON2 C"" B

TAPC: LOA OUTOM R'ORA A CALL STEPJM TTON2 INR ACALL SEE}!; JMl' SF-Elt ,CALL NCO ,LXI O,0UT3!"! ,MVI B,80H ,CALL BITS STEP: PUSH PSN ,STEP ADVANCESOUT PORT] PUSH B ,HEAD ONE TRACKCALL DELAY LXI D,QUT4MCALL BITe ,PULSE TAPE MVI B,40HOUT PORT] CALL BITSJMl' TTON2 OUT PORT4, CALL LOELY, CALL BITC, OUT PORT4

TAPE21 MVI B,1 CALL LDELYJMP TAPE POP B

TAPEll MVI B,2 POP PSNJ"" TAPE RET

TAPE4t MVI B,3 ,.lMP TAPE ,, ,, LOELY: MVI A, • ,LONG DELAY, LOLY' : CALL DELAY

TAP' I MVI B,O ,TAPX SAME AS OCR AJMP TAPC ,TAPEX BUT FROM IN' LOLY'

T"P2: MVI B,1 ,CONTROL CODE RETJRP TAPe ,

TAP): MVI B,2 ,JMP TAPC ••

Listing 2. Tape commands.

player are normally open, normally low. This allows power to the tape player. only when K1 is activatedso the sensing transistor is K1 to latch, supplying The PTT line is grounded and K2 15 not. Likewise,

2#4 MessageWR3AFM consists of two separate repeaters: a 440-MHz

repeater and a two meter repeater. The 444.35/449.35repeater Is a duplexed single-site repeater. The 07/67repeater consists of five repeaters spread around town withthe common input frequency of 146.07 MHz. These satellitereceivers transmit via 440-M Hz link' frequencies to the 146.67transmitter site. Each link has a Station Master antenna, a146.07·MHz receiver, a 44Q-MHz transmitter, a control shelf,and a CW identifier. The IDer Is required to satisfy FCC requirements, and for our purposes they continuously identifywith a row-revet, low-pitch tone. This can be used to determine which receiver has been selected.

At the transmit site, a voting selector chooses the bestsignal from the five links and sends it to the 148.87·MHztransmitter '. The transmitter drives a 250-Watt amplifier,though only a portion of that power reaches the StationMaster antenna through about 500 feet of feed line. All ofthis equipment is of the General Electric MASTR series .

The repeater control is performed by a dedicated 6080microcomputer system. This consists of 57 Integrated circuits and has 3K bytes of ROM, 258 bytes of RAM, seven

~ 74

etqht-btt output ports, and three eight-bit input ports. Thecontrol program is over 1500 lines long. The 8080 accomplishes the user codes , the autopatch, and permits elaborate control options to be accessed via toucntones reomotely.

The 34/94 repeater Is also a sptn-srte repeater. Thetransmitter is in Towson and directly feeds a Station Masterantenna. The receiver is co-located with the 07 receive link atthe Charles Street site. The 07 and 34 receivers share thesame antenna. Therefore, the coverage of 07/67 necessarilyencutte that of 34/94. With the exception of the link transmitter, which is a Progress Une, the 34194 equipment is allGeneral Electric MASTR. It is necessary to walt for the beepto reset the three-minute time-out timer. Additionally, on34/94, it is required to let the entire repeater carrier droponce every twelve minutes. This Is because the drop delay ison the link transmitter, which causes it less wear and tear.

This has been tape message two-pound-four; two-poundone gives an introduction to amateur radio, two-couno-twcsupplies a generalized message, and two-pound-three provides recent club information.

KILL: LD' OUTOH , lULL TAPE OUT 4H: OS ,0 .... , OUT5M: OS ,J M TTON2 OUT6M: OS ,LXI D,OUT4M OUT7Pol : OS ,MVI B,80H ,CALL BITS ,om PORT4 ,C'LL DELAY COOTB: DB 2CALL BITe DB 12 "OUT PORN DB ,JMP TTON'2 OW TAPE 1, DB 2, DB 12 ,t, DB 2

STEPR: LD' OUTO,.. ; Po'ANUALLY OW TAPE20 .... , ,STEP HEAD DB 2JM TTON2 DB 12 "C'LL STEP DB JCALL ROGER ow TAPE )JMP TTON2 DB 2, DB 12 ,,, DB •, OW TAPE4ORG )OOOH ,RAM BOTTOM DB 7, DB J

TTDIG: EOU • DB n "OS 25 ,SPACE FOR DIGITS ow KILLNUHBR: OS 12 ,TEL . 1 DB 2lOADS: EOU • DB n • ••

OS ,.. ,SPACE FOR STACK, ID ' 5 DB ,STACK: EOU • ow TAP 1OUTR1 : OS , DB 2OUTR2: OS , DB n •••OUTR): OS t DB 2TIMER: OS • ow TAP2NOTtM: OS , DB 2LCKR: OS , DB n •••IDS: OS , DB JION: OS , ow TAP )TRl\CK: OS , DB 2TIME: OS , DB t t •••!"'ASK: OS , DB 4LKROG: OS , ow TAP 4OCTOM: OS , DB 0OUT1Mt OS , DB 0OUT2Mt OS , DB n

"OUT)M: OS , ow STEPR

Listing 3. Switch command.

memory of which track themachine was last on a ndadvances the track untilt he desired one is re ached .A bette r a r range me ntwould utili ze a tape machine which has individu allamps to indicate the track .These signa ls could be sentto input ports of the pro-

leads on the SENSE contacts a nd the stepp ingsolenoid a nd bringing the mout separately.

A conside rable amo untof software is ne cessary tocont rol the multi ple-tracktape system. The systemwo rks by dead reckoning;the processor maintains a

audio is a va ilable onlyunder the same condit ions.At this point, the tape isrunning, the repeate r iskeyed up, and the tapeaudio is feedi ng the t ransmitter. The right and leftaud io c ha nne ls have a1D-Ohm load resistor toprotect the audio outputstages. The left channel isstepped up in voltage, rectified, and fed to a tonedetect transistor. Most ofthe left channel is empty.At the end of the message,a tone of almost any frequency is placed on theleft c ha nne l for five to thirty seconds . The tone-detect trans istor detects thetone and activates K2.Immediate ly, the PTT andaudio li nes are releasedand the repeater is freedup. K2 latches th rough the

grounding contact. Bothrelays remain latched, continuing to power the tapeplayer, until the meta l fo ilon the tape reaches theSENSE contacts . This unlatches K1 , which releasesK2 , and all retu rns to therest mode.

The track solenoid in thetape playe r usuall y requires several Amperes todrive it. Relay K3 drives thet rack so lenoid a nd isdrive n by an open-co llector output bit on theprocessor. This permits theprocessor to cont ro l thetrack-select mechanism. Aground on the Kill li nesimu lates the beep tone,killing the tape message. A'tz-vclt power supply is inc luded to power the un it.The tape player must bemodif ied by breaking the

SWTCH: LXIMVICALLOUTCALLCALLOUTJMP,,,

COOTB : DBDBDBOW

O,OUT 4MB. 2BITSPORT<DELAYBITCPORT4TTON 2

59nSWTCH

,SWI TCH TO, 450 RPT,ON PHONE

"

75 ~

Fig. 2. Tape commands.

until the desired track ,passed in register B, isreached. Validity checksare made to prevent possible erroneous requestsfrom pulsing the track linefor long periods of time.

The Switchover BoardOur 449.35 repeater ha s

separate autopatch circuitry, and we had been using asecond telephone line forit. To economize, we decided to utilize the main146.67 auto patch line forthe other repeater , Thetelephone swit c hoverboard decides which repeater is to have access tothe telephone line. Thephone line rests on themain control system, allowing control over thesystem via the telephoneand permitting two meterautopatches. When an autopatch is requested on444.35 , if the line is not inuse, the line is switched tothat machine. The line remains there until the autopatch is terminated , Thetelephone line will only begiven to a repeater if theother one is not using it atthat time. If the request isnot granted , a simulatedbusy tone is generated andsent to the seco nd requesting repeater. To accomplish the remote base fun ction on the 449.35 repeater,

I

"' s-oee ~W ". E"T CURflENTT"ACK T~AC"

SHK ,

M ," ""8"", o.c1 ' NCRE MENT

" , STEP._,~"

~ ~ ~aU(S1 Eii -:, TRACK ,: OU T er '• "ANGl' '

•

_ _ _ _ _ _ __ .J

•-•~ 0", ClJIlH!:NT

'"~.-------- ~

'"' OU~UNT • ,: ~EOuESTE D :: TRA<;I< :

-... --------•-•

•

'" , ~ ST!:PTPACK

~

( Peru"" )

ones whi ch do not havethem. There has been littleproblem with incorrecttrack selection.

listing 2 shows the tapehandling software , Thefour co mm a nds, TAPE1,TAPE2, TAPE3, and TAPE4,correspond to the 2#1 , 2#2,2#3, and 2#4 codes. Commands TAP1 through TAP4c o rre s po nd to the 2*1through 2* 4 codes for useby control operator s .TRACK is the variablewhich specifies the currenttrack . Upon initialization,TRACK is set to 1, corresponding to track 2, This isbecause 2#2 is the mostcommonly used message,and, after a power failure ,presetting the program tothat track gives the highestprobability that the processor and the machine arein sync hro niza t io n.

Fig. 2 shows the varioustape commands. Register Bspec ifies the desired trackfor the SEEK subroutine.The KIll com mand pulsesthe KILL line to the tapecircuitry, sto pping the message . The STEPR commandsteps the tape track andacknowledges with an " R" .This is used to resvnchronize the machine and theprocessor ,

The SEEK subroutine isshown in Fig. 3. SEEK advances the head assembly

Fig. 3. The SEEK subroutine.

TAP Z

TAP'

TA P 4

Tl P 3

T .,.

Ew

. '~V

SE~S[

CQl<TACTS

• • s

nON 2

STE PR

1",,~BL[ O

C"L..L

'" STEP~

ICAL.L~,'"

thi s approach becau se thetape players with the added track lamps are not asreadily available as the

1I NE

PuLSE" LL

0_' 0_'

EN."l~,- . '" ,- .1·- ·1- ~P$> ,~

no.-. ,- .I C lL~ I~"

I ClLl I."I

ST~~ T I..~

TRACKSOl ENoOIO

Fig. 1. Tape loop interface.

.'lv H 2v TOTAPE

Pl.'f"

fTO~ 2

[ NA8UO~o r ES

no...

TA PE 4

TAPE ~

TAPE 2

TA PE I

• -., :t-+", ,,, ,, ,

, ,, ,,

r , ,,

II,

, ,, ,, = c . ." " '-' 3040

IQf yl

'" •

" m-{UH40T-l2

II, ,

" t oo"l~ r.

,

,

,

, " eO LO, 1

""r-- ~-' 1-~ r---', , , ,, : 'J6', , ,, ,

1m :m J;

~ ," , ,,, ,, ,

rP: i,

"", .,, • I, ,, , ," orr , , •, , ,.,

...;. , ,, , ,, , ,, ,,, , ,, , ,

dr •.- , , , ,., ,,

II, ,

, L..____ ~

~ ", "'L • ___ .J

t '1'" " II ' 0,

cessor, and it could advance the assembly untilthe desired lamp was activated . I chose not to use

•

~ 76

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_1 4.8117

,_______, RING

.<"'-- - - - __r 4. 811 '

""......."'- POflT 4 . !liT Z

--- - - -- '"

.'-------,

~oc , .,

L.to4-- lez ·9

~,

COM<ECTOR

Fig. 5. Modif icat ions to processor board.

AcknowledgementsThanks go to Ed Mes te r

WA3 HQX fo r his help inwiring the ta pe unit a nd fo rta king over the responsib ility of preparing t heta pes. Apprecia tion is alsogiven for the gol den voicesof Matt de Rouville K3 MR,De nise O live r, DeborahYost, Jim Hardi ng K3DRJ,and Pa t Biggs KB3CE, whohave re cord ed tapes forus. •

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SoftwareThe sof tware patches d e

sc ribed m ay be included infull o r in part s. It may bepossible to fit the addi t ionsin t he space remain ing inthe second ROM, depending upon how much spaceis ta ken up by the four d iffe re nt IDs and the singledigit tel ephone num bers.However, fo r us, it wasnecessa ry to expand to athird ROM. The last ROMis o n ly a bout o ne-t hirdutilized, so much more canbe a dded before it becomes necessary to wire ina socket for a fourth ROM.

Main Board ModificationsA sm all amo unt of w ir

ing must be ad ded to themain board to permit thenew circuitry to o pera te.The new connecto r wiringis shown in Fi g. 5. Twodiode s a re used to crea tet he AP+ RB + PHC signa lrequired.

II ING..~'"

,

+ 24 V

v" Reader service-see page 195

1 ~ ,' 7~'"

drives a Darlington trans isto r which dri ve s theswitc hover relay. The numbered co nnec t ions go tothe phone connecto r onth e main co ntro l sys tem. Ifthe processor grounds theGRAB line, th e telephoneline will rem ain on the co ntrol sys tem no matter what.When the processor pulsesthe 450 REQUEST low, theten-second timer is a ctu a t e d, s w itc h i n g th ephone line to 449.35 . Whenan a uto pa tc h request ismade on 444.35, + 12 vo ltsis present o n the 450 APlin e . The AP + RB + PHCline com ing from the processor board signifies thatthe phone line is in use.

The software to implement the 59* co mma nd isshown in li sting 3. The 450REQUE ST line is pulsedlow, and the com mand exits.

;);"zoo ~,

,., - •

• '"

" "~F) •J; •

'.m· IZV HN

• • .. .1 • .", ,, ~~ A.- m ' 5~ A.- .';), ;), .

• II•+ 12 V

QutsT 6<>-,

'00 .1 . ,. •' r", • ,. , ..', ~~ Ir-J ;+ oo'f

> •

"'); o.o.A ~'/1:

I )f, ,o.;h 74C 1~

r' • •, >

•.. 0

+ 12 v,. f-" ">

",,

1~C1~

C W > •,

p+~al 1 W'~ ..

"Fig. 4. Switchover board.

after dialing into the control syste m, the code 59· isse nt. This switc hes theteleph one line to the449 .35 repeater for 10 seco nds . During thi s period,signals present on 444 .35will be heard on th etel ephone. If the a utopatch code is sent beforethe ten seco nds e la pse, theau topatch will be activated, the remote base function is realized, and theline remains latched untilkilled.

The swttchover board isshown in Fig. 4. The relay isnormally relaxed and passes the phone line to thecontrol system. Two 5555gene rate the busy signa l.The 1Ok potentiom eter se tsthe level of th e busy toneto the repeaters. A singleD-type flip-fl op handlesthe switchi ng logi c. Thefl ip -flop is CMOS and

..•

,..

Bill Schmidt WB8VQD734 N . JJth StreetMiamisburg OH 45342

Bob Shattuck WB3GCPBox 203A, Rt. IGillett PA 16925

RTTY Transceive for the KIM-1- requires video terminal and AFSK generator

No noise, no oil.

Computer-generated RTTY station: Note use of inexpensive bla ck and white portable TV, SWTPC CT-64 video terminal, and home brew interfacing box.

~ 78

Se ve ra l good articleshave appeared here in

the pages of 73 Magaz ineconcerning the use of theKIM·1 microprocessor forRTTY work.'.".' This ar ticl edescribes a n easy-to-useprogram for RTTY transceive when teamed withWA50XP's article.' It requir e s no a d di ti o na lmemory for the KIM. It isalso designed as a "s tandalone" program for RTTYtransmission at all stan-

dard amateur RTTYspeeds.

Basically, what we de·sired was a complete RTTYstation without the need orbother of mechanicalprinters, TOs, or reperforators. The resultantsystem sends and receivesRTTY at 60, 66, 75, and 100wpm and has a built-in buffer for " a u t o- s t a r t "transmissions, auto-shiftbetween Baudot lettersand figures , and, finally, a

built-in 10 for the end oftransmission. The programdoes not need to bemanually stopped toswitch between transmitand receive and backagain . The resultant systemis straightforward to useand totally silent.

What will you need tomake use of this program?Basically, you 'll need aKIM-1 interfaced to amoderate-speed video terminal. We use 1200 baud,but find that the receiveprogram has to be sl ightlymodified to allow it tooperate at this slow speed.Higher speed terminals willrequire no modifications tothe receive program. Ofcourse, to use this programfor transmit, any terminalwill work regardless of howslow. As long as you're interfaced through the sta ndard KIM-1 TTY pins , thespeed of input won't matter. The program will simply convert the input ASCIIto Baudot and output it atany desired speed. We'vefound, though, that, onreceive, the terminaldoesn't have time to out-

put the decoded characterand get back in t ime fo r thenext start bit. WASDXPmentions running his terminal at 4800 baud; wesimply don't have anythingth at fast ! At 1200 baud,we've found that simplyremoving the last ISRDE HALF (change hi s line0267 to EA EA EA) willallow hi s receive programto work on slowe r termina ls. Comments would bewelcomed if you haveother ideas.

You'll al so need an AFSKto convert the output ofthe transmit program tothe proper tones . The program defines a mark as pinPB7 high, a space as PB7low. This TTl level outputcan be used to drive anAFSK directly . We use acouple of sections of a7404 hex inverter as a buffer. If you have a reason tointerface directly to a standard 60 mA loop, youmight c o ns ide r the optoisolator approach usedin an earlier article on th issubject (see the referencesat the end of this article).

The transmit program

Char. Baudot ZP l oco S 52 53 $ 4A 24T 06 54 & 2E 26

A 62 41 U 72 55 1A 278 4E 42 V 3E 56 ( 7A 28C 3A 43 W 66 57 ) 26 290 4A 44 X 5E 56 3E 38E 42 45 Y 56 59 3A 3AF SA 46 Z 46 SA 6A 2CG 2E 47 1 76 31 1E 2EH 16 48 2 66 32 I 5E 2FI 32 49 3 42 33 ? 4E 3FJ 6A 4A 4 2A 34 cI, OA 00K 7A 48 5 06 35 III 22 OAL 26 4C 6 56 36 space 12 20M 1E 40 7 72 37 f igs 6E 06 Note 1N 1A 4E 8 32 38 nrs 7E OC Note 10 OE 4F s OE 3' 62 20p 36 50 • 36 30 stop 16 28 Note 20 76 51 ! SA 21 bell 52 2A Note 3R 2A 52 .. 46 22

Table 1. Code conversion. Note 1: "Figs" and "ltrs" were included in this chart so that you can manually produce themwith an ASCII keyboard. The program produces them automatically whenever needed, The y are included for testingonly. Note 2: The "stop" or British pound symbol (depends on the receiving machine) can be sent by typing a "+ " onyour ASCII ke yboard. Note 3: The "bell" can be sent by typing a " *" on your ASCII keyboa rd. Other ASCff keys are "it-legal" and will not produce a Baudot equivalent.

Close-up of home brew interface box. Others might consider bringing all peripheral pins out to miniature phonejacks and all controls to outboard switches.

deserves some commento n the methods used . Afterinitializat ion of the Itrs/figsflag. the co mputer awaitsinput from an ASCII keyboard . Upon receivingthat. it ISRs to a subroutineca lled STATUS where theincoming data is tested. Ifbit b is found to be a zero.the ASCII data was ei the r anumber or punctuation. Ine ithe r case, the computermust check whether thelast character se nt wa s a lsoin uppercase Baudot. Ifnot. then the computer willhave to send the fi guresco mmand before it sendsthe characte r just input. Ifit determines that the lastcharacter was indeed uppercase. then all it needs todo is o utput the new character.

The same method holdstrue for lowercase. but inthe reverse sense. The computer is initialized in the"ltrs" mode, since you rfi rst input will probably bea lette r. Should you type anumber o r punc tua tionfi rst . the computer willsense this and o utput aBaudot fi gures cont rol andthen you r character.

Since we have chosenPB7 as the output pin forthe transmit prog ram, a10k pull-up resistor will

need to be added. PBl o nthe KIM-l has no internalpull-up (to permit collector-QRing with other devices). Simply co nnect a10k Y4 W resistor from PBl(A-15) and vee (A-A).

Even before the co mputer ha s c he c ke d thestatus of the inco m ingcharacter, it first rules outthree special c ha rac te rs:space, line feed , and carri age return. A "space" produces the same effec t as" unshift on space" in somemechanica l p rinters. It'snecessa ry as you 're not going to have a ny idea of thekind of p rinter the othe rstation will be using. If youtype a string of numbersand then space to anotherstring of numbers, the computer will shift down on thespace and back up on thesecond string of numbers.The result to the user ofthis program or the stationcopying o n the othe r end isinsignifica nt . In ot herwords, type whatever youwa nt and you can be surethe othe r guy will copyregardless of the se tup ofhi s printer I

So why do we also disregard the line feed andca rriage return as far aswhether o r not to send thefigs/ lt rs command? The

main reason is that it simp ly does not matt erwhether a Baudot printer isin upper- or lowerc a sewhen either of these co mmands are sent. So theco mpute r leaves you in themode you are in.

After the status of the input c ha racter has beendete rm ined a nd fig s/ltrscommands sent (if necessa ry). th e cha racter input isc o nve r t e d to Baudot,sto red away, and thenpicked up by the XMT subro ut ine . Tra nsmiss ion ofthe resu ltant Baudot is accomplished in mu ch thesame manner as by a mechani cal p rinter . Th e

cha racter is sent o ut, bit bybit, with a start b it (aspace). five da ta bits, and astop bit (a mark). Thelengths of both the startand data bits are determined by the va lue loadedin to the o n-board KI Mtimer at loca tion 03CO.Depending on the speed oftransmission des ired. loadthe va lue contained inTable 2. Likewise, since thesto p bit is longer than ast a rt/da ta bit , lo c ati on03E8 mu st have thi s del ayconsta nt loaded. The program is set fo r 60 wpm aswritten , since th is is by fa rthe most common speedfo r a mateu r RTTY trans-

~ 79

put to your AFSK. Instead,anything you type is storedaway in memory for "fullspeed ahead" transmi ssion. How do you know ifthe buffer becomes full?Every characte r you typewill return with a bellso und ing if yo u're using amechanical ASCII pr interor a tone if you're using anelectronic terminal. Theprogram is set up to a llowabout a three-l ine (at 64characte rs per li ne) buffer.You ca n cha nge this atlocat ion 0332 . Whe neveryou're finished typi ng you rmessage into t he buffe r, itcan be sent by typ ing "Cont rol T." Remember to turno n yo ur AFSK and transmitter first , though! Whenyour e nti re message hasbeen se nt, the p ro gramagain loops to the begi nning and awaits your nextinput.

You ca n also load yo urID into a special 10 bufferwhich is a lways ready to besent when you type "Control I." See Table 3 for initial loading instructions.Since you 'll c e rt a in lydump this program toaudio tape, every time youload, your program andalso your ID will be readyto go. You can use the tD aswe do or make a slightchange. Since we send the10 at the end of o u rt ra ns m issions , we ha vecompletion of the 10 automatically jump us into thereceive program. This is acco mplished at line 0321 . Ifyo u want to use this program without WASOXP' srecei ve program , thenyou'll need to c hange o nlyth is one line (see Table 4).This 10 is in RTTY, so you'llneed to either 10 verba llyor in Morse to satisfy FCCrequirements .

A few notes shou ld bemade about the ac t ua lASClI-ta-Baudot code conversion table (see Table 1).This table takes into account all normal Baud otcha racte rs . Figs and It-scommands are incl udedfor testing, but, since the

+0.3

99 33

13

00

comple te c ha racte r, thep ro gr am lo ops to t hebeginning whe re the nextinput is awa ited .

Note that, when yo utype a charac te r requ iringa shi ft , there is a quick twostep sound as first the command for figs/ltrs is se ntand then the cha rac ter,separated o nly by a stopbit. You'll probably getco mme nts on thi s frompeople with mechanicalprinters, as they'll be usedto " li ve" typing whichwon't usually produce thiseffect. Also, if you're a veryfa-t typist, you may haveto ~ause slightly since thecomputer won't be readyfor your next character until it's co mpleted the aboveoperation. Normal typistsand pick-and-punchers cand isregard this warning!

The program does morethan just allow real-timetransmission of RTTY. Italso incorporates a bufferso you can type a shortmessage into the computerand have it output the entire message at full speed .This is accomplished in theBUFFR sec tion of the program. Gett ing into thi smode requires o nly thatyou type "Cont ro l B" (thatis. pu sh the co ntrol keydown a nd hold it downwhile you type a letter" B"). You' ll notice that further typing is no longer out-

+ 1.6

18

135.17

12

+2.4

"

14

153.60

de si re anot he r s peed .Upon transm ission of the

- 2.0

"

15

159.74

60 wpm 66wpm 75wpm 100 wpm

45.5 50.0 56.9 74.222 20 18 13.33

31 30 25 19

163 150 133 99

IlIlII

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!lOll IllS1 I51allIETIf 1512Il!X:~ !ffi'l1!l:«; 12114 lllt6 lSI Dl H t£ IIIIll( 8JJI4 (JM¥ Zltl1 FlI9: IQ IlWIlIWT MllBi1ll (JM¥ 1'lt11 filiI!:1R.111lllIlillilID 11lll1ll1llJm 12121 1m! t£ E 9:III'i mt4 !ffi'l11llll11l s 15 IIl18 fill 9: Dl H t£

Terminal unit provides both 60 rnA loop for mechan ica lmachine when we want hard copy and TTL level signa'sfor the computer.

Example o f weather broadcas ts you'll be able to rece ivewith the KIM. The y are usually high ly coded as th is one is,but decoding manuals are available and we've found theNW S most helpful.

~ 60

Baud ratestart dataU'" ms.)SlOp(t '" ms.)Normal totalchar. time(I '" ms.)KIM 'otalchar. time(t ", ms.)Percent error(Allow ± 5%)Hex to load a'03CDHell to load at03E8

Iebte 2. RTTY timing tsbie and delay cons tants. This table supplies data used by theR r TY transmit program. The values supplied for toce tions 03( D and 03£8 must be loadedif you want to transmit at a speed o ther than 60 wpm (the program is preset for this speed).Dela y cons tants for receive are covered in W A5DXp ·s ertic ie. '

m ission s. C ha nge theabove locat ions o nly if you

BfQBfGIN(plus an NOP)

JM PNOP

fA

02

grams. It's interesting andunusual to see the KIM decod ing Span ish.

If you' re in a Qsa andwa nt to ge t from receiveback into transmit, type aspace. At high speeds. thecomp uter may not pick itup the first time. Try agai n.This is the so le purpose oft he modifi catio n toWA5DXP' s program appearing in Table 4. Wedidn't want to have to resetevery time we wanted •.tosend or receive. With thischa nge. the computer isable to do a ll the work foryou.

These program s havebeen used on the air in

~ 8'

E1

DOEA

4CEA

0249024C

Add:

0200 2C 40 17 BIT SAO0203 30 03 BMI0205 4C 00 03 JMP Transmit0208 A9 80 LOAimm020 A 2C 00 17 BIT PAD0200 4C 4E 02 JMP Back to Rcv.

Table 4. Changes to WA5DXP's program to adapt it to thistransmit program to allow transce ive. WA 5DXP's programappears in the October, 1977, issue of 73 Magazine. Theabove changes af/ow switching back and forth fromreceive to transmit without manuaf/ y resetting the computer each time (see the article for details). If you want thisprogram for t ransmit only and do not want to incorporateWA5DXP's receive program into it, only one line needs tobe changed:0311 FO

work so well we could seeno sense in re inventing thewh e e l. We 've copiedeverything from 60 to 100wpm with no difficulty. Ifyou're so inclined. the WXtr ansmissions a t 14 .395(LS6. 850 shif t. 100 wpm)are a good deal of fun .Al though the data is heavily coded, you' ll see someplain English. This frequency is a lso one availableq uite near the top of a hamband and is accessible fo rthose without a generalcoverage re ce ive r. Youmight a lso check out 7.405(USB. 850 shi ft , usually 66wpm) if you'd like to catchSp a n ish lan gu a ge tel e-

1\.-1341iliI)l1l.1\.-1ll FUlBJ.-1lIlJIlEmI~ICI()'{S II LII; [QJIIIl;, II. TEIIIJIII II lJI Vlll5!1OlJ1Hli

AAI'I1<.fl)TTIJOIIl f(l[Sl II flJiTlI;; EIlRTIl1 Yl1I!IRll. 34; IR1Jll

33; /llO£S1IR CITY 32; 0MNI1i'f ll; Il5T 1IllIlIIl<, llII6 IIm!I

YrlMOIIIl; lIWl' 2); m YUI.II 24; IP.lIIDi YIIlOOlERlM1ED 23;~ YIllIIU!lRllli 12; III.\!lIIIPTIl1 YBlRIDGRl Ill; IIUSTa. 19; QIDI; f'Il!( ImlJ&IIl5T \lIl17;~ 14 YLOIISTlR CITY lZ.~~

IIffi lllZB2I0: IB2B•

The computer won't mind foreign languages as this spparent sports broadcast proves . With the computer's ab ility to copy any speed. you 'll be able to print m uch - butnot allof what you hear.

Change:

minor timing errors havenot been corrected by theprogram. There's simply noneed to, as any printer ,mechan ical o r electron ic,can handle errors up to5% . Since we used thedivide-by-1024 position ofthe KIM timer, even i n~

cre me nts of millisecondsare not possible. Correction factors can be programmed in , but we foundthese consta nts plenty accurate fo r any use you'llprobabl y ever encounter.One thi ng's for certain: Amechanica l printer isn't going to care eithe r way.

The re ce ive programwhich we've referred tomany times has performedwell here for some tim e.We had conside red writ ingone, but found this one to

Decide what yo u want sent.Example: " DE WB8VQO elr elr 1/1 "

Convert it to ASCII using the chart below:

Tell the computer how long your 10 is. Thisnumber, in hex, is loaded at 031E.1f you're nolfami liar w ith hex, take the last location ofyour 10, add one, and use only the last d ig it.

Example: My 10 ends at 001 B. If I add one,that 's 001C. Using only the last digit , I get"OC" as the hex nu mber to load at 031E.Disregard the number a lready at 031E.

Table 3. How to load the ID with your call.

Step 1:

Step 2:

A·41 N-4E 1-31B-42 ().4F 2·32C-43 P-50 3-33D-44 ().51 4-34E-45 A·52 5-35F-46 S·53 6-36G·47 T·54 7·37H·48 U·55 8·381·49 V·56 9-39J-4A W-57 0-30K-4B X-58 space-20L·4C V-59 elr-QOM-40 Z·5A IIf-QA

Step 3: Place your 10 into memory beginning at 0100 .Example:

00'0 0 440011 E 450012 space 200013 W 570014 8 4200'5 8 380016 V 560017 Q 510018 0 44001. cI, 0000lA cI, 000018 III OA

Step 4:

program supp lies themautomatically, you' ll p robably never use them. ABaudot "figs" is producedby typing "Cont ro l F" and a" ltrs" command by "Control L." If you are in the"ltrs" mode and type a" f igs" command, you ' llreally get two of them, asthe STATUS subro ut inewill supply one of its own!The same applies to typingthe "ltrs" command whenin the " figs" mode. Takethis into account if you'reincli ned to experiment.

Delay constants for thetransmit program appear inTable 2. Since only fo urspeeds a re leg al o namateur ba nds, only cons t a n t s fo r th o se ar epublished. Percents of e rror are a lso included, as

News agencies, especially transmitting in Spanish, aboundon the low bands. Copy is not oeriect, but then we use aPLL-based TV and no liltering. A better TV should produce perfect copy!

numerous QSOs and havebeen found to create aqui et and efficient RTTY

station. Aside from the advantage of saving the ou tput from a mechani cal

printer, we' re incli ned tothink this is the RTTYof thefuture-no noise, no oil.There's an obvious plus tobeing ab le to send andrece ive at any speed without c hanging gears. Changing speeds is as easy as typing in a couple of se ts ofnum bers.

Co m me n ts a re we lcomed and inquiries willbe answered if you' ll include an SASE. Our thanksa lso to K8NlM who spentcountless hours o n the airhel p ing with operationa ltests and to WB8ZVlwhose suggestions led tomany of the ideas incorporated into the program. •

References1. "Try Your KIM·1 On RTTY,"

WA5DXP, 73 Magazine, Oct.,1977.2. " Rl l Y With The KIM, "K4GCM, 73 Magazine. Sept.,1977.3. "KIM-1 Can Do It." W4CQI. 73Magazine, Feb., 1978.

KIM·, SourcesltnlormaUon

1. KIM Customer Service, Commodore International, 950 Rittenhouse Road, Norristown PA19401.2. Johnson Computer, P.O. Box523, Medina OH 44256.3. Computer Warehouse Store,584 Commonwealth Ave .,Boston MA 02215.

Books and Newsletters1. " The First Book 01 KIM,"ORB, P.O. Box 311 , Argonne IL60439, 59.00 postpaid, 176 pgs.2.6502 User Notes , POBox 33093, N. Royalton OH441 33.

0)00 " 0> INIT 1.0.4.1.. 1'\1 U.l1 ze in 0)90 .," "".., Retrle~. eharaet.r

0)02 " '" STUp " H r .- .0<1.• • 0) 9 2 '" '''' Put i ll ll. u « hhr,, '" ao ,. " IlEGIN J"Sft GRTCHA.Il GU ASCII d.. t.-. 0 ) 9 ) " 00 LDA~P.ll. Look-"p s.."d.ot0 )01 " 00 STAEP Store d..t. 0) 9 5 " 00 STU p Stor. 1t0 '" ze " " JSft STATUS 0 )97 ec ee 0' ",SH :utt .nd .. 114 1t .,,'" 'C '" " .I JIF IlI>G I. 0 )9A 60 '"0)01" <2 00 10 ..."'- Ch a r :t 0 ) 9 8 ., '" PICS UlUp Te.t St. t " a Ylas0) 11 " .. ,..,

1.OA~p,ll. St . r t rtlad. . t 0010 0) 9 0 ec U &1:.. U ORlt_20 ) 1 ) " 00 STAz p Sto... eh. ...c t ... 0)9 ' ., 00 .....- If - l t r . o......t •0)15 es .. """

sa.._ :t O) AI " .. STU p0 ) 11 ee " 0' JSlI. STATUS 0 ) 1. ) " 00 ....., a _ t r 1.... oh....ct.rO) lA " .. ""., C. t 1 0 ) 1.5 " " STAz p T• • p . Ckar . Sto r .0 ) 1C " ,n 0)A7 .. " ....,- Ilalldot - f l S.- e_not0 ) 10 80 ec C1'11_ Do" e wI th '" 0 ) A9 " 00 STAz p St o u 1tO) l P 00 " BIlE 1001 0 ) A8 "

,." J 8B :tlr'l'

0) 21 '" 00 " .Ill' UCUVI 0' '' ., " wup ft_ t r 1e .._ eh. ..."t...0 ) 2/0 <2 00 ""'''' ....,- Ch.r :t "00 '" XII0 811-1 "" i"\It 111 X ulll.hr0) 26 " " " m, JSB CETCKAB Input to b"ffer 0 ) 81 " 00 I.O.l~p,:t LoolI: -"p t1a"clot0 ) 29 cs " CJlF1_ Co"trol --r -' 0 ) 8) " 00 STAz p Stor e "on•• ralon0) 2 8 ec " B.EQ :tllT8 0) 85 " .. " JSB UT0 ) 2 0 " 00 0> ST.... b • • ll. stor e ch.r.ct.r "" 60 '"0))0 " "" 0'" " 00 XNORII_2 1.OAzp R_trh..e "har."t.r0))1 80 " CPX1... Illl f h r !IIU t 0)8B " eo " .III' ll.IIORII-10))) eo " BCS IlUfUL "" .. 00 '" LOlllu. Clear :(0 ) )5 ec ee " JMP GKTB O) CO .. ec LlJU•• Def1n. P1l7- Oll t Pllt0))8 ., " BUI"UL LOA1_ ASCII " b U" 0)C2 ec " " STAab . """OnA 20 .. " .lSI!. OI11'GHA B • ncl. rll1l! 1tI O)CS " 00 "" LOAzp Cit nor d Ballclot0))0 " ee " JIU' GET! 0)C7 " ee AND1.. Ch . r b I t . ' -I03/00 ee " ''''' STbp StOrti lnIf h r H elt 0)C9 80 ce " STAab. '"0 ) 4 2 <2 00 "",- Clear X OJCC .. ., serr 1.01.1.. Tl.e. 221: • •0,", " 00 0> ll.Jrl'801 LDAIlb.,ll. R••d. bu.f h r 0,," eo 07 " ST.... ll.

"" ee ea S'''', sa.._ ll. 0 ) 01 zc 07 " TGHJ[ - l 8U . ba t l,e _o"t ,0 '" " 00 STU p :nor . ell. r .et .r "'" " " IU'L TCI!J( - l t;o ' ".It .0,. , " " " J 5.Ii STATUS 0'06 ee '" Solt lip nn t bitO)/oE " " ""., G_t X "07 ce 06 CP:f1_ St . rt/DII t . d.on e 'O)SO ee no< "09 " " 00"' M Q STPBT0)51 '" " C.I'll.I P 8Ilrr. r I1&l t uaehedt O)OB 06 00 ASLlp ,., ne l t b it0)5) " " &;Q B.EG II 0'00 '" cs " JIIJ' LTll0 )55 " " " J IU' l "TB.l Ol EO 06 00 ~'" ASl.tp ' " . t op bit0 )58 ., 00 STATUS 1.OAzp 01. ,,11: ch.r.ct. r O)EZ ., 00 LDAz p

"" cs ac CJlFl _ - Spa c.-'

" '" 80 " " STAab. "'" 5 top blt • f 870)5C " " eea LTRS 0 ) E7 ., " "".- 1'1... ) l e • •0" ' cs .. Cl'I!'1.. -Llne Feecl"' 0)£9 ec 07 " STAa b•0)60 " " BEQ nIT O) EC " 07 " TCHK_ 2 BIT.b. Time ·01l.t '0)62 cs 00 C"Pb. wC.rr1.@ 8 a.tllrn "' ccee ro " IlPL TCIlK-2 No' ..... It.

"" " .. BEQ Ell.Il' 0)1"1 60 '"0)66 cs .. CIIP1•• Control " I"'0)68 fO " BEQ ID0)6 A cs ca CMP1.. Co n t r o l "8-'0 ) 6C ee ss BEQ e UPI"Il "'"0) 61: .- 00 BI Tl:p T.. a t chAr.c ta r0) 70 se " IIVC I"IGS Bit 6 • ze ro '0)72 ., '" L'!'RS LOUl' Tlat St a t ,, 1 PI..0 )7" eo " BEQ SI>TL Ir " f1l!. - , r ... t .0)76 " 00 UU UlAzp G. t ~a"tIlr Re.erTed Locat1 o" ••0)78 '" ,.u Put ln X r.sl.t.r0 )79 " 00 LDAEp .l LooII:-up Iaucl.ot 0000 Ctl....ete r StOrti (Pr l _ rrl0 ) 1 11 " 00 STUp Sto... con...r.t OIl 000> sa.... X "0 )70 ec '" 0) .ISS :tin' a l>l1 ul)<1 It • 000' SilTe X ez0 )80 60 '" 000' 8Ilrrer U.lt :Ito,..0)81 .. .. S!1'L Ull1•• foot fIal! to "'H r ." 0.... - Ltra /Plg. St.tu. ~~0 ) 8 ) " '" S1'Az p 'N', o.. r a c t e r St o r e 11'''.'''1'. 1'7)0 )8S ., 00 ...." B.trl••• e~a ...eter0 )87 " 0, STAEp r.ap. Ch.r . Sto... 0010-001'_ 10 Sto...s e Are. If•• l." . Lene; th .. lb c".r . c h r .'0 )89 .. " .....,- Ila"d.ot - l t r .- eoaaal\d (se e Tabh ) t or In.t ..... e tlon.)0)88 " 00 STA~p St or e it0 ) 80 ec " 0) J SB :tIlT . M. . e n<! a . • • • • nd ue T.bl . 1 for o the r r. aer.ed. zero paS. l ocaUona •

Fig. 1. Program listing.

~ 82

• - -•

• ••• ••

• • ••• •

"• • • •• • •

,• • ,• • •• •

• • • • •u ....

•

•

p

\

-

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MICROCOMPUTING

areHas It All • • •

Ask for Instant Software at your local computer store, usethe handy order blank provided at right, or order your software by phone-call Toll Free 1-800-258-5473.

Action Games

BUSI NESS PACKAGE I Keep tM bookl fOf a smallbusiness with you' TRS-80 lIIvel 14K , The 81. p.og.amsinc luded a.e:• G....'.I Inlorm.llon- The Ins truc t lonl 10' Using thepac kage.• FInd A..e l Control _T his will give you a liS! of you.!I.ed asse ts a nd te,m dep.e c latio n ,• 0a1.1I Input-Th iS p.og.am let s yo u c 'e a te e nd 'eeo,dyou r g e neral ledlle . on ta pa for fast access.• Monl h and V'll' 10 D. I. M-.ge- This p.og,am willlak e you. mo nthly ledge . da la a nd gIve you a yea. to daleledge r.• Proll1 and losl- With Ihis p'Oll ' em you ea.n Quiekly

get t..al bala nce lind p.olll and IOU lIa'ltfTlenlS.• V.a. End Balanee - This p<og••m . ,11 combi... all

you. dlla I,om lhe prolit and lou stat""""'It inlO a yea,end belanee ~t.W,'h ' h IS~kall". you can ma ke you. TRS«Ia . o,'dngpert..... Order No. oo13R S2I.IS.

DEMO I This package Is just the thing to Show you'I' ie nds whal you r TRS·SO can d o. Inc luded a'e:• Comp u" , Compo.... - COmpo" e .nd pllY m"sic us ·lng only a standa rd AM ra dio.• B...ball - Pla y baseba ll with you. compu te, wh ile I'does 'he Kore. eeping,• H..... Race- Pla c e you' bel and cheer you. pony ' 0

Iha w,nn",' , Ci.cle.• ESP_ Tes t you, poWf!f$ of e .t.asensory perceplion.• HI·lolTlc:·lac·loe- Gu.ess lila see,,,t number 0< oet

th.ee in a'ow• P.,.I,. Around lila RoM - C.n you f,gu'" out thesee.el behind the live dice?• Slot Machl... - Tu, n your compu'e< ,nIO' one-a,meao.nd,t. TheM P<Oll.ams .equ"e a TR$-80 level 1 4K.Order No . OO2OR S7.15.

Business

DATA TAPESTop quali ty high densit y audio cas

settes for data storage. Each cassetteruns 30 minutes, and is fitted with convenientl y marked labels that make cont rolling your " data bank" a snap. Sold in tot s otlour. Order No. 0067. $7.95.

BUSINESS PACKAGE Itt Th 'S pkk. ea.n e ....nge you.TRS«I into. lull .""'iog pert .... IOf any oos;nesaman:• In.....tory_ Ma inta in II COfTlp\;le,-based ,nvenlory for• eons'anl invenlory syslltfTl .• Ccwnmillon,. and P_..-let you. compu, ....

figu'e OUI mllrlcup a nd discounl calculll'ions. Hies ta .and mor•. ThiS Is a perfect Iimeuv,ng PlIC kall" lor anysmallOOlir.ess,For lhe TR&-80 level I .K. Order No. 00I1R S7.15.

BASIC AND INTERMEDIATE LUNAR LANDER Bring YOU'laflde< in under m..nual control. The BeSIC 'f8f&ion;s ro<beginners; the Intetme<!'a 'e _sion ~ more d,fllCuil.w ith a chOIce of landing a ' elS and 'ugged te<'a,n , Fo<one playe' w ,th a TR&-80 level I 4K. L_ I II 16K. OrderNo. 000l R S7.1S.

BusinessPackage I

SpaceTrek II

KNIGHT'S OUEST/ROBOT CHASE/HORS E RACE Thilva.ied pa c _age o r on" pla ye. ga mes will g ive yo u hou rsof lun,• Knlght' l Ouall - Ba ttle demons to gain t'easure andbecome a rull lle<l ged knig ht.• Robo' Cha..-Deslroy the dea dl y 'obots withO ute le<:l,o cu ting yo" rs e l!.• Han. Rice - Pla c e you. bet . nd c hee' you. reese 10the finish line.The se p.og,ams ,equi.e a TRS-ao level I 16 K.Order No.0003R S7.IS .

DeSTRO Y ALL SU BS/G UN BO ATS/ BO MBER HilS

package of Ih'ee p'Oll'aml il fun ro< lhe whQlellmily. In·e tuded a'e.• Dont,oy All SulK-Hun, down flt\ltfTly subs wh,le

a void ,ng m,nes and lorpedoes. A one playe. game,• G"nboal . - On. 0' two play",s can try to blow each

o lhe.s Ih'pS out 01 Ihe wa'e.• Bomber - Ca .e lully 'el"ase you. bom b to des t.oy themoving subma.ine . A one p la ye< g ameTo enjoy these p,og/aml you'll need a n~s·ao l e v,,' I 4KO,de . No . 0021 R 51.iS.

TANGLE/SUPERTRAP These two p'og.a m s .equ i.e fas tre fle xes , a nd a goad eye 10 ' an g le s '• Ta ngla _ Ma ke you r op pone nt c ,a sh his line into anobstacle.• Silpert..p - Th is p.og.a m la a n a dvanced ve rsi on 01

Tan g le with m.ny use' contror op lions.Enjoy these exc ,t lOg and g,.phlc.ll y beauHlu l P' og ra ml ,Fo ' one ()I' two pla ye.. with a n 8K PET. Orda. NO. OO19PS7.IS.C AVE EXPlORING/YACHT ICONCENTRATION The l eteree p<og'amsa.e nol only ' un . but stimulating a l we ll:• C.... bplorlng _ 5e. ,e h lor Il'bulous l,eaSU' l!$ a,

you e xplore the magic cave , For one pIayet'.• hctrt - One playe< can enjoy this game based onYa htzee• Concenlrallon - Two playe<, can pil lhei, memories,n this prog.am based on the poptlla. ' e le'ris ion showYou 'U need a TRS-80 with l_l I and 16K. 0nSef No .oo10R S7.9$.

SPACE TREK II P'oteclllle quad'ant trom Ihe InvadIngKll ngon warsh ips, The Ent erprise ia &quipped withphasers, photon torpedoes, impulse power. and warp I "dr ive. II' I ~ou a lone and your TR5-80 Level I . ,(. leve l II16K.g.intl tile enem y. Ord.. No. 0002R n .es.

RAMROM PATRO lfTIE FIGHTERIKUN GON CAPTUREBuck Rage.. """". had ,t so good. Eng..ge in e .!late.·,,,st,, .. wa rl.. 'e with '• Ra mrom Pa t,ol - Des!loy t he Ram.omsh,ps beroreIhey capture you• Tie Flgh'.,- Des l'o y the e nemy Tie hghte,s andbec ome a he.o or Ihe ,ebellion.• KUngon C.ptu.. -You mUSI c a p'u.e Ihe Klingo n Ih,pint act. U', yo u and you. TRS·5O l ev e l It 16K bal1linga c ,o l s the gal u y, O'de. No , 0028R S7,9S.

TREK·XCom ma nd Ihe Enl"' p< 'se 0II10U KOu' lhe QU"O,' an I 10' "n"m1 ..... ships. Th's p..c k..g" not on l1 h..ssupe'b g'IPh,cs. but includes p,og.amming r()l' opl,onalsound " IIKI'. A one pla ye . gam" la, tM PET 8K. O.d••No . OO32P S7.IS.

OUBIC·4JGO·MOKU Play IWO a nc ient games on you rmode rn PET, The two p.og.ams 'ncl uded are :• Oub lc ·4 - Play a mult i-dimens io ned game 01 trc-tactee• Go·MollU- Li ne up live 01yo u' men while bloc king thePET', movesThe.. one pl.ye, games '''<lu" e 8K or memo,y .O,d• • No .OO:UlP S7.I S.

CAR RACE/RAT TRAP/ANTIAIR CRAFT Enl01 tM se chal·le ng lng , !lm tilled p.og ra ms'• CI' R. c. - Yo u a nd a I.;end can ' ace on a enoree oftwo I ra eks ,• Rat T' l p _ T,ap the rOIl in his maze with yo u. t..o catsFa , one pla ye .• An UI I. e..II - A,m a nd shoot do wn 1M enemy a ir·plan". Re Qu" es l e vell " K TRS·BO. O.der No .OO11R S7,95,

PENN V ARCADE Enjoy Ihis fun tilled package Ihal's asmuch fun as a '''011 penny a.cade _ ..1 I I.aet,on o r tl'lecost!• Poelry- Compose t.ee _se poel'Y on you. com·

pu ter,• T.ap _ Conl.o l ' wo fT\OYlng I,nes . ' once .nd 'est you.

COQfd"...t,on• Poller - Pla y hve card d.aw poker ..nd ..t you, PET

de..1 .nd kfKIP seoee• SoIIIII"-Ooo', botlle< '0deal , Ie' you. PET handle

,r.e c...ds ,n Ihis " 0'<1 ra -.or,t" ·· c...d g.a.me• bl·Em·Ups - Find oul how many sll" you. 0Qbt>Ie.can N' UO bero<e the g ame,s overTheM Si. orog••ms requ"" Ir.e PET w"h 8K Otdet No .llCJo4.lI p S7,1S.

SPACE TREK IVT,ade or wage Wi ' on;ll planetary scaleThi$~k-o. includ es'e Stellar W. ",- Engage and """"0)' T,t! tog"''''' ' In you.attack on lI'e Deaul Sta•. For one playe<• ~.'Ion SImulation - A,,,,opl.yeo' game wl\ereyOOJCOfl1folthe economy o f two ne 'liIhbo,,"g planetsYou <Me,"".guns or bulll!f. ...,' Il you, TRS-eGL_t II Hill 1,_;;::.: : : ::::IOrO« No. OO3<IR $7.95.

SPACE TREK III Let yourself I/O to 1M ' I ' ends 01 1MIIOla. system-and Del'Ond This paCkage ,neludes '• S ' 81'a. WI tS- Shoot down the T,,, lIghters anddell'OY the De..lh Still .• Planetary Lander-l ..nd you. s~K,al1 .nd planl1OU' rtag ac'OSllhe sol.. , s1stem,These one pla1er g ..mes .eqU"" a TRS«I lr<el I " 1\0nSef No. 0031 R S7.IS.

Educational Games and Simulations

Home and Personal

BOWLING l ei you. TRS·80 set up the pins and kll'l!pscore. Doe player can p ick up spares and get str ikes. Forthe TRS-80 Level 14K. Level II 16K. Order No. OO33R $7.95.

CHECKERSJBACARRAT Play two old favorit " " w it h your

'"• Cheoch..-Let you. PET be you , eveNeady opponen tin t his computer-based ch ec kers program.• a . carrll- You have both Casino a nd Blackj ack-stylegames in this realis tic prOll ram.YOUI PET with 8K w ill oller challenging p la y anytime youwant. Order No. 0022P $7.95.CASINO II T his craps program is so good, it's the nextbest thing to btt ing in Las Veoas or Atlant ic City. It willnot onl y play the game wit h you , but also w ill te ac h youhow to play the odds and make the bes t bels. A oneplayer llame, il requires a PET 8K. Order No. 0015P 57.95.

AIR FLI GHT SIMULATION Tum your TRS-SO Into an air·pl ana. You can p' actlcI:I takeotts and land ings with theben l:llit 0 1 lull instrumentation. Th is one-player s imula·tlon requires a TRS·SO Lever 14K, Ll:lvelll 16K. Order No.0017R $1.95.

GOLF/CROSSOUT Have tun wit h these exciling one·playa r games, Included arl:l:a Golf - You won' l need a mashie or puttee-cor a ceo

die. to r that matte r, 10 enjoy a challenging 16 holes• Cronoul _ Remove all but the center peg in thi s puzzle and you, neighbors w il l call you a genius .You 'll need a TRS·SO Level ' 4K. Level II 16K. Order No.0009R $1.95.

GOLF Wil hout leaving the comtort 01 yo ur cha ir, you Canenjoy a computer ized 18 ho ll:lS of gall wit h a completecho ice 01 clubs and shoaling ang les. You need nev ercance l th is game because 01 ra in Onl:lortwo p layers can

enjoy Ihis game on Ihe App ll:l wi th App ll:lsoft II and 20KOrder No. 0018A S1.95.

DOW JONES Up 10 six p layers can en joy this e xci tingstock markel game, You Can buy and sl:lll Slock Inresponse to chang ing market conditions. Get a taste ofwMt playing the market is all about. Requires a PET wit h8K. Order No. 0026P S1.95.HEX PAWN/SH UTTLE CRAFT DOCKING/SPACE CH ASE!BATTLESHIP This 'oul ·ga me package Is sure to providehours ollun l or the who le l amily.• Hex Pawn _ Turn your TRS·SO Into a model 01ar tific ialIntelligence by p laying a Slmpll:l gaml:l ,a Shutlle Crill Docking_ land your snutua cIa" on t hestarship-even through very ing gravity l ields !a Spece Ch u a- Seek out and destroy the enemy de ltathaI's hidden In the star field• aallleahip - You must find and destroy the enemyfll:ll:lt.This package requi res a TRS-80 l evel I 16K. Ordar No.0041R $1.95.

SANTA PAR AVIA ANO FIUMACCI O Become the rule r 01a medieva l elty-state as you struggle to crea te akingdom. Up to si x playera ca n compete to see who willbecome tne King or Queen I lrs l. This p rogra m requires aTRS-SO Levell & 11. Ordar No. 0043R $1.95.

CARDS This one·player packaga will let you p lay cardswith you r TRS-80- talk about a po ker face!a Draw I nd Stud Poker_ Thl:lse two programs will keepyour gama sharp.a No-Trump Bridge_ Play this popular game with yourcomputer and develop your strategy.The pac kage name says H a ll, Requ ires a TRS·SO LevelII 16K. Order No. 0063R $7.95.

MIMIC Test your memory and rellexes with the l ive di'·terent versions 01 this game. You must match the seQue nce and location of signals displayed by your PET.Th is one·player program Includas optional sound e ffec tswit h the PET 8K. Order No. 0039P $7.l15.

BOWLlNGTTRILO(]Y Enjoy Iwo 01 Aml:lrica 's lavorltegames tea nstcrrrec in to p rogram s for your Apple:• Bowling- Up to fOUf pla yers can bowl while t he App lesets up the pins and keeps score. Rl:lqui res Appleso ft II.• Trilogy _ This p rogram can be anything 'rom a sim plegame of Iic·tac·toe to an axercise in deducli ve logic, Forone pl ayer.Th is fun ·filled packageleQulres an Ap pll:lwit h 20K. OrderNo. OO4OA S1.95.

BACKGAMMON/KENO Why sit alone when you can p laythese fascin ating games w il h your TRS·SO?• Backgammon- Play aga inst t he computer. YourTRS-SO will give you a stead y chall",nging ga me that'ssure to sharpen your skills .• Keno- EnjOy th is popu lar Las Vegas gamblinllgaml:l.GUl:lSS the r ight numbers and win big.You ' lI need a TRS·SO Levell & II. Order No. ooo4R $1.95.

OIL TYCOON Avoid all spills, blowouts and dry w",lI s asyou battle to become the world' s richest oil tycoon , Twoplayers become t he owners 01 compet ing oil companiesas they search for o il and control t hei r companies, Re·Quires a TRS-SO 4K Level l & II. Order No. 0023R $1.95.

CASINO ' These two programs are sc good. you can usethem to check ou t and debug your own gambling evete m !a RouleU. - Pic k your number and place your bet wit hthl:l compu ter version 01 this casino llame. Fo r onep layer.a Bl lckJeck- Try out this version of the po pul ar cardll ame be fore you goout and risk your money on your o wn"surellre" system. For one player ,This package requires a PET with 6K. Order No. 00 14P$1.95.

DA MEX

--------

BASEBALL MANAGER This pa ir of programs will let youkeep statistics on eac h 01 your players. Obtain batting,on-b ase, and fie lding ave,ages at t he tou ch 0' a finger ,Data can be easi ly stored on cassette tape for later cernpar tson. All you need is a PET w it h 8K, Order No. 0062P$14.95.aOWLING LEAGUE STATISTICS SYSTEM This packagl:lis thl:l an swer to the prayers o f harried boWling le aguescorekeepers. The Bowling Leagu", Stalistics gvsternwill keep a compu terized list 01 league da ta. taam data.and data l or each bowler. It is extremely flexible and hasa total 01 16 diU", rent options to let you modi ly t he proglam to suit your league's rule s. The prog'am is vl:lryeasy 10 use and has e xtensive " buil t·ln" aids to help youalon g. Requires TRS·80 Ll:Ivel II 16K. Order No. 0058R$24.95.

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Send me the followingInstant Software:

o Check 0 Mo ney Order 0 VISAo MasterCh arge Explfatlonda te _

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Peterboro ugh NH OJ4!l8

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Instant Software

today !

To order by phone, call

to illree 1-800·258-5473

(MasterCharge, VISA

and AMEX order accept

ed) or ask for Instant

Software at your loca l

computer store.

I Qu an tit y IOrder No. I Pfogram nam l:l I Un it Cost I To ta l cost I

Shipping $1 .00

Instant Software Inc. Dept. 73-ISA2 Tota l order

I

II

~ I"0•••E-e I0•• I0

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a Sli tus o f Homea- This program will allOW you tokeep track of antne e xpl:lnses involved in bu ilding onehouse or an enl ire subdi.islon.e Au l o Expenses- Find ou t e.aclly whal it costs you to

drive your Car or truckThese programs requi re a TRS-80 Level l 4K , Order No.0012R $1.9S.

PERSONAL WEIGHT CONTROU BIORHYTHMS Let yourPET help take care 01 your personal hea lth and sa fety :• P. rlonat Welghl Con l rol_Your PET will not on lycatcutete ~ou your ideal weigh t. but a lso otter a deta iledd iet to help contro l your ca lo ric intakea Blorll ylhma- Find out where your critica l da ys are forphysical. emotional. and intellectua l cycles .You 'lI need only a PET with 8K memory. Order No. 00051'$1.95.

ELECTRONICS I This pac kage wi l l no t onl y calculatl:l thecompon ent values fo r you, but will draw a schl:lmaticdiagram too. You' ll need a TRS·SO level 14K, Leve l II 16Kto use'• Tuned Ci rcuits and Coil Winding - Design tuned clecuits wit hou t reso' l ing to cumbl:lrsome tab les and catculations,a 555 Ti mer Ci rc u its - Qu ickly design astable o rmooostaure t iming circuits using this popular IC.• LM 381 Prump Ou ign- Oesign IC preamps with thislow no ise integrat ed circuitTh is pac kage will reduce you, designing t im e and let youbu ild those circuits l ast. Ord.r No. 0008R $1.95.

PERSONAL FINA NCE I Let you r TRS·SO handle a ll thetediou s details the nexl lime ~ ou f igure your tinances :a Personal Fln enca I-With th is program you can con

Ha l ~our incoming and outgoing e xpenses,• Ch ec kbook - Yo ur TRS·80 can ba lance your

chec kbook and keep a detailed list 01 expenses lor ta xtime,This hand~ financial con tro l lor the home requires onlya TRS·80 Levell 4K , Order No. 0021R $1.9S.M ORT GAG E WIT~ PREPAYM ENT OP TIO N /FINANCIER These two programs will more than pay forth emsel.es if you mortgage a home Or make in·vestml:lnts;a Mortgage wilh Prepa~ment Opllon_ Ca lcu late mort ·gage pa~ml:lnt scheocres and sa .e money wil h pre·payments• Financier - Calculate wh ich Investment WIll pay you

the most. figurl:l annua l depreciation. and compule thecost 01 borro wing. eaSIly and Quickly,All you need to become a linancial wizard wi th an 8KPET, Order No. 0006P $1.95.

STATUS OF HOME S/AUTO EXPENSES Two long aw aitedprograms that have got to save you money at work or inthe homl:l;

H AM PACKAGE I This versatile package lets you so lvemany 01 the commonly encountered problems in electron ics design. With your Level I 4K or Level II 16K TRS·80. you have a choice 0"e Bn lc El lH;t ronics wilh Voilige Divider - So lve prob·lems inVolving Ohm's Law. voltage d ivid l:lrs. and RC timeconstants.a Dipole end Yagl Antennn- Design antennas easily,without tedious catccrettcos.This is the pertect packag e 'or any ham or technician,Order No. 0007R $1.95.

Electronics

Keyboard Konvenience- simplify entry of BASIC programs

Throw in an LED for good measure.

-evcc

,".

~lEO

SN74ODN. Pin 14 is + 5 V dc and

'60 n

llPOT S "tT~K, ------------7/~'W ",,. ,,

'8 0 II

·~~oc

DPDT $W 'T~~, -----------.,~," ' '~~D~- . ,

•,c,<'s- '0

Fig. 2. IC3a, b, and cpin 7 is ground.

Fig, 1, tct s = SN740BN AND gate. IC2a = SN7404N inverter. Pin 14 is + 5 V dc on both ICs and pin 7 is ground,

punctuati on, etc., are st i l lunder the control of theshift key . Both circuits aredifferent methods of implementing the same fun ction depending on whattype of Ie gates you haveavail ab le.

The LED indi catesupper- an d lowercaseoperation, but it can beeliminated since the position of the sw itch or theoperation of the keyboardwill indicate which modehas been chosen. I ju st likelots of lights.•

Rod Hallen WA 7NEVRoad Runner RanchPO Box 73Tom bstone A Z 85638

I re ce nt ly repl aced myup p erca se-only k ey

board with on e thatgenerates both upper- andlowercase letters becauseword processing is o ne o fmy personal com p u t ingg oal s. However , thi sneces sita te s co ns ta nt lysh i ft i n g when ent erin gBASI C and assembly langu age programs. The twocircuits here (Figs. 1 and 2)all ow either uppercaseonly or both upper- andlowercase operation at theflip of a sw itc h. Numbers,

There' s a new, eighth OSCAR satell ite in orbit , and the AMSAT team helped put it there I

Your he lp is needed for future satellites. Join AMSAT and support the new, advanced Phase III series of OSCARs, engineered to provide communications overtranscontinental distances for hours at a time,

Send $10 membersh ip dues to AMSAT, P.O. Box Z7 , Washington , D,C,Z0044. Life membership is available for a tax-deductible donation of $100or m ore , payable In quarterly Installments i f you wish.

Phase JII sate l lit e so lar cells may be sponsored for $ 10 each , andwe 'll send you a certi ficate spec i fying the cells you are sponsoring.

For a tax-deductible contribut ion of $ 1,000 or more , we'l leven Inscribe your name on a plaque to be placed In orbitaboard the Phase III spacecraft for posterity , and we'l l sendyou a replica honoring your contribution .

Dues and contributions may be charged to VISA o rMaster Charge. Phone us at (Z0 2) 488-8649.

~ 86

, t I-

Documentation DOW Include. " P ETCommunication with the OutsideWorld" which outlines use of the

memory expansion bus. IEEE bus.parallel port. file control . vstem. etc.PET Computer with Basic BASIC programming

course (free) -7 9 5add on full sized keyboard for fast typing -1 2 5

WRITE FOR A LIST OF THE LATEST INACCESSORIES FOR THE PET

KIM-IA COMPUTER FOR HAM RADIO

APPLICATIONS• =,,~ \

THE COMMODORE(P)ersonal (E)lectronic (T)ransactor

The PET 2001 microcomputer is a complete t urnkey computer with a number of features especially

applicable to ham radio.-Heavy duty steel cabinet for RF shielding andrugged use.·6502 CPU, 8K user RAM (expandable), 14Koperating system with 10 digit BASIC, fi le controlsystem, cassette operating system. This is one ofthe fastest interpreter BASICS a vailable.-72 Key Keyboard with all ASCII characters available without shift. Lower case and graphics availablewith shift.·9"C RT with clean, high resolution display.-Progra m editing uses movable cursor to INSERT &DElETE characters ANYWHERE on the screen!No need to retype lines.-Butlr in real-time clock and interval timer.RTTY and MORSE programs a vailable which trans forms the PET into a complete computerizedRTTY ICW terminal.-Memory expansion bus allows 65K RAM. ROM.and VO expansion.-Twc VO methods standard: BBit parallel portw/handsheke, and lEEE-488 bus for multipleperipherals . IEEE supports high speed 8 bit transferto any of 15 different devices on-line simulta neously·PET floppy and PET printer with advancedfeatures available

A LL ITEMS A S SEM B LE O!TESTEO

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KIM·I • ...-.. .uppIy.2~ hook.: " Thor FInl 800Il of KIM' · Po\ooerNl6502II",opi.....esOQr. now .....cond RNB.I-UE theComputen<l:...t f'Tovr"'''''''lIIa Mic:.ocooopulft: 6S02 '. , 111M .. P"obal>IlIl.... bnf fOJ1ced by4~\pIu>.Coo'"lobol W"prowndnq!-oo.w ,w.{O)in the held KL\11Nional pack_ on mic:rocompul.... avalla". II'>CIuo»s Iktinga of 0Yft Moo) 13 «ichoorog modn and -",anced aoct.loc '""""donnwnI.o""" 'I '19.00 p.,......~. 5VSOIrlllIly....:l &a_ program.! SpodaI p.,kagr. KIM, ",lIh 3.........t. !UN ....... an o-ff.coenl, la.l. and.-y 10P""7"'" and 12\1. 8V at 4 .....,. . 16 Vall~ '40.00

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W ould you believe it'spossible to work

DX(( when the band isn't

open? Well , you can workDX(( even if you don'thave a ham license , It's not

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Fig, 1. Program lis ting,

Get a load of Instant Softwareand a whole new world ofelectronics design with your TRS·SO

Turn your TRS-80 into the most versatile 1001 on your workbench . The Electronics I and Ham Package I series of programs will save you hoursof ted ious cal culations. You can design circuits in a fraction of the lime tt took you previously . These programs will draw a complete schematicdiagram of your desired circuit with all components labeled . You can even design a c ircui t around part s on hand! And you'll Qat your designs offthe drawing board and into production FAST. Save time, money, and energy as you get more fun out o f el ect ronics !

Electronics I Ham Package I LeYel l " K, Level ll 16K

If you're still des ign ing c ircuits the old fash ioned Ham Package I - We had 10 call it something , bu t thisway, let the Electronics I package introduce the latest pa ckage is no t only tor hams. It's great tor any ex -way to go: per imenter or technician in need ot a dynam ic reference

Tuned Ci rcui ts and Co il Wind ing -Design tuned ctr- o t popu lar elect ron ics formulae. The included programscu its for audio and rad io frequencies. Thi s two part pro- will ca lcu late:gram will find the missing two values trom any two of the 1. Ohm s Law-Easily perform s ca lculat ions involvingtcncwrnq. frequency, capacitance, induc tan ce , or reec- voltage, current, res istance, and power.

tance . The co il winding sec tion will calculat e the number 2. Series and Para llel Calculat ions-Find the value foro f turns and wire gauge req uired for a c lose wound, air or capaci tors or resi stors in pa rallel or series ci rcu its.slug tuned coil from the inductance, diameter, lenqth ,and pe rm eability 01 t he coil. 3. Vol tage Dropping and Vol tage Dividing -This will

555 Timer Ci rcuits- Timers , both monostabl e (one. give you the value of a dropping resistor and the euecttveres istance of t he load.shot) and astabl e (oscillator), can be easily designed wit h

th is two part program. The program wil l a lso draw a com- 4. RIC Time Constants-This section w ill calculatep lete schematic on the sc reen o f your TAS-BO. the resistance , capacitance, or the t ime delay of an RIC

lM381 Pream p Design-You too can qu ickl y design circuit.an IC preamp. With th is program all you need to do is 5. Dipo le and Yagi Antennas-These two prog ramsenter the parameters o f the perform ance you want, and will compu te t he dimensions of an antenna to your exactthe program does the rest -right down to drawing a frequency and give you an on-sc reen display-complet ede tail ed schem at ic o f your c ircuit on the screen ! with all mea su rement s!

To order by phone, ca ll ton tree 1·800·258-5473 or ask lor Instant Software at your local computer store.

-----------------------------Send me the following Instant Software: Check Money Order VISA AMEX

MaslerCharge Expirationdale _

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Name, _

Instant Software Inc. Pete rboro ugh, N H 03458

73-ISF1

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Quantity Catalog Program name Unit Cost Total cost

"""'" Ham Package t $7.95

""'. Electronics I $7.95

Blank cassetles tor da'a $7.95000' sloraQe - on lots 01 lour

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write programs lor Instant Software, Total orderand send me your free software cata-

easy, but the award is commensurate w ith the effortput fo rth. So jump in withboth feet and t ry you r luckwith Computer DXCC. Ifyou don't want to use th isprogram as is, read on. It isadaptable to many otheruses.

The o r igina l p rog ra mwas adapted from a quizprogram in Basic Programming by Kemeny andKurtz . Over a period ofsome six months, we haveupdated the program againand agai n. Somehow ,every t ime we work a newcountry, it ends up being inthe prog ram !

The Program

The prog ram as listedg ives comp lete inst ruct ions in the opening l ines.Line 30 asks for your nameor ca ll , and it is stored as

H $.

The program al lows youto se lect a " c l ass" o fDXCC, which is determinedby the number of countriesthat you p lay. The maximum is 50 countr ies fort he Extra Class DXCC. Thecountries are arranged inthe data statements in anincreas ing order of d ifficulty.

You automatically w in ifyou answer 90% correct.Thus, if you answer co rrect ly t he first 45 out of the50 Extra Class countries,the program will go d irectly to t he certificate awarded to the w inners.

[f a cou ntry name isgiven, you mus t supply t heprefix . If the pref ix is given,then you must supply thename of the country as it

appears on the ARRL DXCCCountry Li st. You are giventwo cha nces to answereach question wi t hout penalty . The number that youanswered correct ly is considered worked and confirmed. W ro ng answers areconsidered as worked on ly.The prog ram keeps trackof your worked/confirmedreco rd , as wel l a s apercentage c o m p u t e dfrom them. A certificate isawarded to those whomake the grade.

Program Breakdown

Lines 10 to 150 supply informati on on how to playthe game. Lines 160 to 440set up the computer for thenumber of countries thatyou want to work (variab leN in l ines 380 to 440). Lines500 and 510 set va riab lesW (fo r you r worked coun-

tries ta l ly) and X (for thoseconfirmed) equal to zero.

The main body of theprogram sta rts at li ne 520.The loop is completed atl ine 720 and is executed Ntimes. Line 530 read s t hefirst two pieces of datafrom line 880- in this case," Guant anamo Bay" and" KC4." Notice that thedata is set up to alternatethe country's pref ix and thecou nt ry's name as thequest ion.

Line 540 sets up var iab leT to keep track of whetheryour answer is the first orsecond t ry . Line 550 printsthe country or prefix, andyour answer is recorded in560 as C$. If your answer isrigh t, t he program jumps to650 and your worked andconf irm ed tallies are incremented by one each.The current record i s

OK, nZCiMO . TIns IS A CiA,Ml'; DESICiNEU rc rEST YOURA,BILr Tr TO IDENTIFY PREFIXEs AND COUNTRIES THA,TIf,U BB WORKED A,LONG THE dY TOWA,R!l IUlCUvINCi TKEA,!IlERICA,N RADIO REI.:.Y LU.GUE 'S OJ( CBNrtJRY GLUBAwARD. YOU IolAY SELECT THE CLASS OF DXCC TM', YOUWANT 1'0 TRY FO~ ACCDRDINC 1'0 THE FOLLO'dINGNUI!BERs OF COU~TR1E.:; ,

OK? >QE RMA NYdRONG. LID . THERE IS A BAND OPENINC . TRY AGAIN .DK~ FEDERAL REPUBLIC 01' GER1o:AI>-YCORRECT , r., CE CUESS .YOU NO'1i HA Y;;; 10 I I~ 'dORKED I CONPlRllL<:D .

IF THE COUNTRY I~ AN ISLAND, T!lEN TilE ~ORD ' I S LAND' IS ~OT IN THE M~:E.

ALL COUNTRY .liAiO.ES ARE TAK.C.N FROIl TltE ARRL'~ j)XCC LIST.

THE NU~BER CO~IRY~D IS THE ~u~mER RICHT.OXCC IIlLL BE A'~ARDED FOR 90% CORRECt .YOU WILL GET TNr CHANGE~ TO ANStER COR~"CTLY.

IIIlICH CLASS Of DXCC DO YOU ;/ANT 'to TRY fOR?ENTER THE CLASS EXACTLY ...S usno UOVE? ) ~ OvIG E exec

~OVICE IIXCGGENERAL IIXCCADVAICEII DxecEXTRA CLASS DKCC

15 COUNTRIES25 COUNTRIES35 COUNTRIES50 COUNTRHs

YV? ) VESEZUELACO~RECT , NICE CUESS .YOU 110.... IlAVE 11 I 1 1 dO~KED I CONI'l~~D .

I1'ALY~ ,. ICO~RECT, IIICE CUESS .YOU NO·t! HAVE 1 2 I 1 2 ~O~KED I CONFlRI,;EO .

Kl5? ) PUE RTO ~ICO

tlRONG, LID. TIlERE 1s'" !lAND OPENINC . TRY ACArIl,KZ5? ;> NAV.o.S~susz YOU ...cULD!!'T RATHER TRY fO~ WAS? rtili CORRiCT ANStl~R, CAN4l. lOM.YOU NOiJI IIA VB 13 I 12 tlORKED I COllFIRI>lI':D.

CUA~TAliAMO <lAY? l<:C4CORRECT, IIICE GUESS.YOU 110"' HAVE: 1 I I IiORKE:D I CONPI~~ED.

COLUMBI A? ) i!XCORRECT , NICE GUESS .YOU NOIfl !j}VE 14 I I) ~ORKED I CONFIRMED.

GA~Y TONeRE 1lA4Fn AIID CHRI S . <:I NER I12GRAIflAR D tlA 2Gr.O AN !lONORARY COMPUTER

1I0VICE DXC C

AFTER CAREfUL SCRUTI NI...~1ION 01' YOU R .o.PPLtC.o.TION, TIlE tlRITERSOF THlS PROORAM TAKE G~EAT (NOT ALL THAT GREAT) PLEAS UREIN AiJlA RDI NG YOU NOVICE exec.YOU IIA VE ...CKlEVED ... 92 .85714 ~ ~ORKED I CONFI RMED RECORD. FB IYOU RETIRE ifII'l'H 14 I 1 ) WO~KED I CONFIRMED.SINeE YOU DID SO iiELL, WIlY HAVEII"T YOU MADE execFO~ REAL? NO, YOU CAN' T DO It ON 2 I'lETERS.AND NO~ FOR YOUR CE~Tl fICATH SUITABLE FOR FRAMING •••• • •.

CANADA? ) \11'.:CO~RECT, NICE GUESS.YOU NO ~ IlAI'E 2 I 2 tlORKED I CONFIRMED.

TI~ ~COSTA RICACORRECT, NICE GUESS .YOU NO~ IlAVE ) I ) WO~KE:D I CONFIRMED.

FMIC E? ~ F

CO~RECT, NICE CUESS.YOU NOti HAVE !o I 4 1fI0RKED I CONI'IR)\[D .

KP!o~ ~PUE~TQ RICOCOR~ECT, NICE GUESS .YOU NOlo" IlA VE 5 I 5 tlORKE D I CONPI RMED.

10"7 ~UNI TED STATES OF AMERI CACORREC T , NICE CUESs.YOU NOiJI HAVE 6 I 6 WORKED I CONFIRI'.E/l .

Q~ ) ENCLANDCORRECT, NICE GUESS.YOU NOlo" HAVE 7 I 7 1i0~KED I CONl'IRrr2D.

BELGIUM? >ONCOR~ECT, IIICE GUESS.YOU NO iJI HAVE: 6 I 8 1I0~I(ED I CONFIRMElJ.

DDDDDDDDDDDDDDDDDDD110 DDDO DODO DD00 0000 DO110 aDDO DD110 DDDO DDDO ODDDDDDDODDDDDDODDDDO

rx xxxx xx

xx rxxx xx

xxxxxx

"xxxx

xr xxxx xx

xx Xl(XX xx

cccccceecccc

cc ccCC CCccccccccccccCC CCcc CC

ccccccCCCCCC

CCCCCCCCCGGG

GC ccGC cccccccccoccccCC CCCC cc

ccccccCCCCCC

Xl!:? ) MEXI COCORRaCT, !>"ICE CUESS .YOU 1I0'1i IlAVE 9/ q .ORKED I CONl'IRM.i::D.

1). WA2CMOUNIVAC 1100 Is Cl.UR AND car ,

Fig. 2. Sample program run.

~ 90

printed and the con f irmedfigure is compared to t he90% figu re of the countries worked of your class .I f they are equal, or if theconf irmed figu re is greater,a jump is made out of theloop at line 710 to line 760.Othe rw ise, t he loop repeats .

Assuming that you answered w rong just once,line 580 sends you to line480, which is printed . T isincremented by one andyou go back to line 550 . Ifyou goof aga in, l ine 590sends you to line 490,wh ich is pr in ted; L= 2, sol ine 610 is ski pped and theanswer is pr in ted via l ine620. li ne 630 inc rementsonly your worked tally. Ajump is made to the printof -vour record in l ine 680,and the rest proceeds asnoted above.

If y ou haven 't jumpedout of the lo op by the timeyou have gone through it Ntimes, you haven' t made

90% correct. In that ca se,the p rogram goes to line85n by way of 750 and endsat CJ999. If you did win, theprogram goes t hrough l ines800 to 840 and into t he certi fic ate subrout ine . Theprogram then returns toline 850 and ends at 9999.

Modifications

Th is program was written on a Univac 1100 at theUniversity of Miami. Itshould run as is on mostlarge co llege and highschool computers. If youwant to run it on yourm icro, some changes mighthave to be m ade in the int er e st s of co nse rvingmemory. You can eliminate lines 10 to 260, but, ifyou eliminate HS in line 40,it won 't be there to printyour name or calion thece rt i f icate in the subroutine. You could alsodecide on just one c lassand elim inate everythingup to l ine 450, except for

giving N some value equalto the number of countriesin your list. You cou ld alsoeliminate the subroutine,but the certi ficate is nice,especia lly if you can get aha rd copy of i t. Of course,you ca n c hange the d ata toany countries o r prefixestha t you w ant, excep tt hose beg in ni ng w ith anu m b er suc h as 5Z4 variables like those won'tbe accepted by the compu ter. If you don't want toalternate c ou nt ry-p re fixcou nt ry , you can set u p thed ata to print either thecoun try o r the pref ix al oneas t he quest ion. You canalso make the game easierto win by changing the winning percentage on line700 and also the print statement on line 230.

One o f t he n icestfeatures of the pro gram istha t , by changing the datastate ments, you can ad aptDXCC in to a qu iz , such as

naming the capitals of thestates. Just rewrite the datalines to read state-capitalstate-capita l and so on. Thenum ber of different quizzes that can be der ivedfrom thi s format is end less.

Note that our Univac accepts l ine 1030, the command " page." This allowsou r pr in ter to print the certificate on a separate page.You might have to make aloop of print statements ifyou want thi s fea tu re butlack t he page command.

Conclusions

W e have spent manyhappy hours w riting andplaying DXCC. If you reall ywant to get into it, tryrandomizi ng eac h classand making a large datal ist. W e hope you enjoyDXCC, and, if you come upw ith any more modifi cati ons, send us a list of yourve rs ion. W e would like tosee w hat you 're doing.•

91 ~

A Low-Cost Circuit Board Holder- price tag: 45¢

.The st ingy solution.

Russell W. SIHlrlJJa Gayll' St .Papillion NE 68046

I f you are still chasing PCca rds across you r work

bench, you may be interested in a cheap cardholder for PC boards. I wasbitten by the computer bugthis last winter and decided to build a syste m fromscratch, using MSI and LSIch ips and standard 44-pinprototyping hoa rds. Afterevaluating a number of

92

CPU chips and " o nehoard" systems, I decidedto build a system based onthe Popular ElectronicsELF.

My goals were: to learnas muc h as possible, tokeep the project within mylimited budget, and to endup with an expandablesystem . The ElF was lessthan S100. and I felt itwou ld be easy to expandwith ot he r ha nd-wi redboards . I d idn' t feel competent to make my ow n PCboards, so I c hose the pro-

A $.45 card hofder,

totype board and wmngpencil method.

After collecting thenecessa ry parts and designing a layout, my first proble m was ho ld ing the PCboard so that I cou ld use awiring penci l in one handand a soldering iron in theother, My first thought wasto locate a professionalcard holder and vise (suchas the PANA-VISEl, but itcame down to a choice betwee n using my limitedcash fo r expensive equipment or buying computer

hardware. I chose the latter, electing to solve thecard-holding problem withmy junk box and some leftover ingenuity .

After making sketches ofmy ide a (F ig. 1), the nexttask was to collect parts .Rummaging among my bitsof this and that sto red inthe garage, I spo tted ahardwood stave from ashipping crate (2" x y. " x18") and a short length ofthreaded rod (v.;" x 12"). Inone coffee can I found five1 % " screws left over froma curtain-hanging project (Iused molvbolts after thecurtain fell down), and inanother coffee can werefive washers and two wingnuts from a TV anten nathat blew down lo ng ago. Itpays never to throw anything away!

That left me with so meT-nuts to pick up at thelocal hardware (a packageof five fo r 4S¢). With thisco llection of bits andpieces, I hoped to make aPC card ho lder for a standard prototype board (4" x6" o r 4" x 9"). The size ofthe holder can be se lectedto suit your own needs. Thesmall Radio Shack boardswill fit if they are slipped insideways.

To bu ild the ho lde r, I cuttwo pieces of hardwood

$Dollar thoughts $ $

to consider about the

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How does the cost of the Drake system really compare toalternative methods of getting on 144-220-440 MHzfm?

AFirst of all. there is no direct comparison possible,because the Model 1346 Drake UV-3 is the only rig inthe world offering 144-220-440 MHz fm in a single box-and it is fully synthesized on each band.

BThe nearest comparison would be to add the suggestedlist prices of three sepa@te units of competitive fmrigs presently available. It would work outapproximately as follows (and you would end up withthree separate units to power):

2 Meters (Synthesized to 5 kHz) $ 449.00220 MHz (Synthesized to 5 kHz) . .. . . 449.95440 MHz (23 channels, crystal) . . 349.00Crystals (Assuming 20 per 440 MHz radio) 120.00

Total compet itive price ..... $1367.95

R. L. DRAKE COMPANY

But wait-even at those higher competitiveprices you'd still be missing these features

included in the UV·3:

1. Full synthesis on all three bands2. Extra djode-proqrammable fixed

channels on each band3. Priority scan fea ture on each band4. Everything in a single box!

For your homework, then, ponder the follo\.Ving- a t asuggested amateur net of $795.00, the Model 1346Drake UV-3 (144-220-440) is, to say the least, anincredible value. It gives you a real reason to trade UP!

Pri<:e:> and specifications subject 10 change without notice or obJigati01l.

93

and the vise -which eve ryhobby ist shou ld have onhand.

In using the "c hea p cardholde r, " I find it usefu l toplace a small mirror on thewo rk bench under the PCcard so t hat it is easy tosee if wires pushed throughfrom the other side a repos itioned correctly . It isnot d iffic ult, however, toflip the ho lde r over tocheck wire pos ition a ndfl ip it back again. I hopeyou find this as useful atoo l as I do . •

~-----------

W'NG --_

""

Fig. 1.

bottom block in the viseand bent the rod approx imately 70 0 . In t his positionI can swi ng t he ho lder in anarc or set it in position bytighteni ng t he wing nut atthe bottom of the 2" x 2"b lock . I can position t heholder at any 3600 pos itionon the e nd of the rod byt ighte ning t he wing nutbehi nd the buttb lock.

A coat of va rnis h finis hed the job. A PC cardhol der fo r less than 4SCf!That is not counting thethreaded rod (abou t $1.00)

center, and drove aT-nutinto t he hole . I now hadtwo b lo cks with T-nuts.

Next, I faste ned t hefin gers on the 2" x 4·3f8"block, o ne to each end . Ifou nd it advisab le to predr ill the sc rew ho les inboth the bu ttbloc k and thefi ngers. I dr il led the fingerho les so they wou ld just fitover t he sc rews . This madethe buttb lock ho les snugenough to keep a good gripo n t he sc rews .

I assembled the ho lde rby th read ing a wing nu tabou t th ree inc hes o ntoone end of the rod , with thewings toward the cente r.The n I pu t a was her on therod and the n t hreaded onthe card holde r. I t he nt hreaded the remain in gblock o n the rod with theT-nut faci ng the wing nut.Twistin g it unti l the e ndprotruded below the end ofthe b lock, I slipped on awas he r and a wing nu t.

At this po int I put t he

(%" x %" x 8") and thenp ut a 1/16" ke rf down thelength of each piece. Thiskerf was to hol d the ca rdonce the woode n finge rswere sec u rely fastened tot he buttb lock with the four1 V2 " sc rews . I cut the 1 V2"X v.." x 4-3/8" bu ttbloc kfrom t he remaini ng ha rdwood and beve led oneend. The bevel a llows adjustab le tension fo r onefinge r, permitti ng a snug fito n a va riety of similarsized cards. (I fin d sma llvar iatio ns in d iffe rentman ufac tu rers' cards.)

Bef o re faste n ing thefingers , I dr illed a 5/16"hole in the center of th eblock and two pi lot holesfo r the sc rews at each e nd .Nex t, I tu rned t he buttblock up so t he na rrow sidefaced me and drove aT-nu t into the 5/16" hole .

I then se lec ted a 2" x %"x 2" section of the re maining ha rdwood, drill ed aSf16" ho le th ro ugh t he

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94 V" Reader Service-see page 195

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Keym Electronics

95

User Report: the IC-245- good things come in small packages

Only two reservations.

/979

R. Stanley Dicks W8 YABox 331, RD2Triadelphia WV 26059

As many amateurs noware doing, I recently

decided to upgrade from acrystal-controlled twometer rig to a synthesizedtransceiver. I wanted anall-mode rig, but one whichalso was compact enoughto use on FM from mysmall foreign car. Aftersurveying the currentmarket, Idecided to try thelearn 1(·245 with sideband

adapter, and I definitelyhave not been disappointed! The compactness ofthe rig is truly amazing: Itcontains a fully-synthesized two-meter FM transceiver, a digital display,and a sideband/CW adapter, all in a box not muchbigger than most two-meterFM rigs alone. Crammed into this box are 47 transistors, 8 FETs, 241(s, and 61diodes, and one heckuvatwo-meter rig!

The 245 is fully synthesized from 144 to 148MHz. From 146 to 148MHz, it tunes in 5-kHz

This is the Icom 1(-245.

steps, and from 144 to146 MHz in 100-Hz steps.There is, however, a buttonwhich allows one to tune in5-kHz steps below 146MHz, making sweeps ofthe band more rapid. Tuning is accomplished with asingle large knob, eliminating the two or three switches and knobs which oftenmust be turned on othersynthesized rigs. The knobhas a solid feel and has aclick-stop mechanism sothat it clicks and holds firmat each increment. Thisprevents possible drift dueto jostling in the mobile,

and also allows for tuningin heavy traffic withouthaving to look at the rig. Ifone is on .76, for example,one can go to .79 simply bycounting six clicks on thedial (at 5 kHz each).

The rig comes with aquick-tuning adapter knobwhich easily can be slidonto the main knob, allowing rapid tuning across theband-especially on SSB.The digital display is largeand easily readable, withfour digits (146.52 readsout as 6.520), and an automatic dimmer so that thedigits are dimmed in a darkenvironment (in the car atnight) and bright in highambient light. They shinebrightly enough to read inall but very strong, directsunlight . The meter indicates relative power ontransmit and signalstrength in receive.

The unit has an ingenious dual vfo system, alsoin use in Icom's 701 and711, which allows almosttotal versatility in settingup offset frequencies. Under normal circumstances,one Jines up the vfos 600kHz apart, and they thentrack together for the routine repeater split. However, it is possible to program any split desired from5 kHz to 955 kHz . The in-

•

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fea tures fo r only $169,· now and forsome time to rome. Features that meanvalue and versatility, li ke 26 rangesand seven functions, including conductance (wh ich m e a sure s leak a g e to101°0'- And three-way overload protection. Hi- lo power ohms. And more .

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A bottom view of the JC-245 shows the five connected cans containing the helicalresona tors which are responsible for the rig 's excelfent selectivity. The final transistor;s inback.

struct ion manual says t hatthe unit ha s an automati cre verse ci rc ui t so t ha twhe n tun ing from 146 to147 MHz, the 600-kHz splitwill automaticall y reverse,mak ing it unnecessa ry tothrow a switch to reversetransm it/re ce ive frequencies above 147 MHz. Ano te accom panyi ng t hema nual. howeve r, statest ha t, " due to cus tomer reque sts," t his autom at icreversal system has beendefeated by the add it ion ofa single sho rti ng wire . Thenote says tha t the wiremust not be removed whi lethe ri g is in warranty. Assoon as my warranty expires, I inte nd to removethe wire and see what happens; if the reversal systemfunctions, it would makere pe a te r access possib leanywhere from 146 to 148MHz without the necessityof throwing a single switch.Nifty?

The 245 runs 10 Watts onFM (true FM) and CW and10 Watts PEP on uppersideband. local stat ionsreport that t he audio isc risp and clean o n both FMa nd S5B, and that t he CWnote is excellent, with noc hirping or cli cking. Theyalso report that carrier suppression is excellent; evenwhen I am over 59, no onecan hear any carrier at a ll .

The rece iver section ofthe rig has the q ua lity forwhich learn has becomerenowned . Even in the presence of strong local signals, I have never heardany cross modulation orfront -end overload. Theaudio sounds sha rp for atwo-meter rig, and a rearpanel jack allows plug-inof an externa l speaker. Thereceiver seems to be q uitese nsitive on both SSB andFM. An FM signa l of 51 willbe full -quieti ng, a nd sideband signa ls a re regularl ycop ied whic h are o ut ofran ge of the ri g's 1a-Wa tttr ansmi tter. In fac t, there c ei ver ' s se nsi tivi tycauses some fru strat io n; I

98

hea r many stations I can 'treach with only 10 Watts!

On FM, the 245 has aconventional double-conve rsion system with i-fstages at 10.7 MHz and 455kHz, and on 55 B/CW it hasa single-conversion i-f at10 .7 MHz. Sensitivity isra ted a t 0 .5 uV fo r a 1a-dB(5 + Nl/N ratio on SSB/CW,and 0.6 uV for 20 d B ofquieting on FM. If anything, the ri g appears to bemore sens itive t han its ratings. The noise blanker fo rSSB/CW rece ption is quiteeffect ive at cancel ling t heoccasional hash-typeno ise s I have tried it on,and the rig is considerablymore impervious to autoignition noise than was myp revious rig . No matterwhat I did to try to suppress ignition noise withthe o ld rig, I had about S4QRN; with the 245, theignit ion noise is ba re lydi scern ibl e . The rece iverhas a sw itch to se lect aslow age rate for SSB reception, and the result isSSB whi ch so u nds assmoot h as low-ban d SSB o nmy Drake receiver.

O ne can cite featu resand spec ifications all day,but the proof, as they say,

is in the punch. The 245 is adelightful rig to own andoperate. It is compact andtherefore easily transferredfrom auto to house andback. Recently, I stuck it inmy suitcase along with asma ll 12-vo lt supply and awhip an ten na and too k ito n a business trip . Try thatwith othe r multi-mode rigs!Two-meter SS B operatio nfrom the 14th fl oor of ahotel is fun !

At home, with an 11-elemen t, vertica lly-po larizedbeam at 70 feet , 1can hearlite ra lly hund reds of repeaters o n the synthesizedrig and can regula rly ca llinto machines as far out as150 miles. This is one of thereal joys in store for thecrystal-controlled operatorwho changes to svnthestzation; t he numbe r of accessible re pea ters is staggering. The ve rtica lly-pola rized be am doesn't do wellon SS B and CW wheremo st ot her stations are using hor izontal antennas,but even with cross-po lariz ati on , the Ie om ' s 10Watts and sensitive rece iver provide regul ar contacts o ut to about 100m il es. The 245 gives onefull f le xi bili t y o n two

meters: FM work on any repeater o r simplex frequency, satellite work, weaksignal CW and S5B DXing,mobile and portable work ,and so on.

I can cite only two reserva tions abo ut t he 245 .Fi rst , it o perates only USB,and thus cannot be usedfo r mode J OSCAR work o nSS B; m ay be Ic om w il lcome ou t wit h a n l SBfilte r. Second, the photosensi t ive cell wh ich co nt ro ls the automat ic LE Dreado ut dimmer is locatedright bes ide the tuningknob . This means thatwhen the operator reachesup to tune the knob, oftenhe blocks light from thecell , causing the readout todim . It is only a minornuisance, and one soonlearns to move the handslightly when tuning sothat this doesn 't happen.

These reserva tio ns arenegligible when comparedto t he flexibility and performance which such a sma llpackage provides. I canhard ly wa it to get a horizontal beam up and a sma llli near amp to tack on to therig, and I am working onOSCAR antennas now. Seeyou on 144.200! .

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Eric Sho{khouser W9Cl527Spring RoadWashington JL 61571

The History of Ham Radio- part VIII

The early '20s.

Reprinted from acc News, apublication of the ChicagoArea Chapter of the aCWA.

A dna/wd dl'~,fptfon

with hookup d(Qgram!JQnd OOIuf'8 p~P'I~d b{;the Radio Dl'p<srrment,Nllwa,A Sllnda/) Cnll,t04 Mat't~( N,,,,<,,*. N. J.

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100

T he evolution of radiobefore, and to a great

extent during, the 1918 waryear was for the most partin the hands of radio amateurs and the experiment-

ers . The development ofthe vacuum tube and itsutilization required muchtime for laboratory research. The quenched-gapand crystal detector were

still very much in use . Considerable effort was beingput forth by commercialcompanies together withgovernment e ng inee rs,notably the Navy, to develop reliable means of generating undamped wavesalong semi-mechanicalelectrical line s . Th eculmination of these efforts was the Alexandersonalternator, providing highfrequency energy withpower up to 200 kilowattsto satisfy navigational andoverseas communica t iondemands.

Following the evolutionof radio art, two majorpatent-issuing c o rpo rations emerged in America,undertaking re sear chtoward larger and bettervacuum tubes to replacethe quenehed-gep and thealternator . They wereRadio Corporati on ofAmeri ca, a group consisting of General ElectricCompany, We stinghouseElectric and Manufacturing Company, and American Telephone and Telegraph Company, which

@

'1lyM. B. SLEEPER

RADIO HOOK-UPS

signifying broadcasting bya newspa per, private orpub lic organization, or person licensed for that purpose, including amateurs,was assigned 100 to 150mete rs a nd 285 to 485me ters.

O the r wavelengths we reintended fo r co mme rc ia lship to shore and overse ascommun ication.

General broadca st ingstations were on wavelengths sufficient ly diffe rent so as not to be hea rdwhen a re ceiving set wastu ned to another stat ion .This was to be dete rm inedby the broadcaster himse lf,using his own equipment.Amateu rs were supposedto operate most ly late atnight, usin g wavelengthsbelow 275 meters. The ea rly receivers had pract ical lyno se lect iv ity. They were

geographic ally close together decided by agreement to broadcast at diffe rent times of the day o rwere located some di stances a part, the li stenerwas denie d satisfac to ryre ception.

This trouble some problem of in terference bec a me so ac ute that inFebrua ry, 1922, the Department of Commerce drewup plans which rearrangedwavel engths to the broadcas ter and to othe r se rvicesas foll ows:

Public Broadcasting, signifying broadca st ing fromun iver s it ie s , public institutions, and stationslicensed fo r the purpose ofd isseminat ion of informat ion and fo r educ ationa lse rvices, was ass igned 485to 495 meters.

Private Broad cas t ing,

EVERYDAY ENGINEERING SERIESNORMAN W. HENLEY PUBLISHING co.'1 WE'T 4~ TH. STREET. NEW YORK

1922 EDITION

AMOK OF THE MOST ADVANCED CIRCUITSOF RECEIVERS.AMPLIFIERS AND TRANSMITTERSfOR DAMPED AND UNDAMPED WAVE WORK:

•

•

re aped the benefits of hisexpertise in wire less .

The market mushroomedwith the proli fera tion ofb ro a dc as t tran smittersthroughout the UnitedSta tes and the rapidl y inc reasi ng a vail ability o frad io receivers. Improvements in qua lity and reliability also cont ri buted tolowered cos ts . Vac uumtubes were produced bythe thousands, graduallyimpro ving th eir fun ctionbut remaining far from being a uniform product. TheUV-200 detector and theUV-201 amplifier were thema instays. All others weree it he r experimenta l o r leftovers from previous designs.

The year 1921 saw arap id growth of broadcastrad io se rv ice . Ele c tr icman ufacturing compa nies,un iversitie s, newspa pers,a nd many individua ls o btained perm ission from the ..Department of Co mmerceto become broadcasters .Radio amateurs had permission to transmit news,music, and items of interest over thei r sta tions.Broadcasting rece ived theattent ion and guidance ofva rious gove-rnment departments. Interest in radiowa s universa l.

This rapid expansion also had its reverse effects.Inte rest waned when d istu rbances occurred . Thereason - genera l news ande nte rta in ing music wasrelegated to one wavelength, i.e., 360 meters. Official government stationsb roadcast ing informat ion,we ather, and market newswere o n a wavel ength of485 meters. Not all st a tionsheld to these wave assignments accurately . Deviations gave some stat ionsadva nta ges over othe rs .The re wa s no t e no ug hro om fo r all to commun icate with out excess ive c rossovers . The1921 -1 922 rece ivers werenot built to be selective orto avo id overlapping sign al s . Unl e s s s ta t io ns

pooled patent license s,and then Haze ltine Corporation, an independentlicensing holder. This was atime whe n many patent appl ications were floodingthe patent off ice coveringci rcu it designs, and manycomponent parts were e ntering into the assembly ofradio re c e iv er s a ndtransmitte rs. The two companies acted init ia lly ashol ders o f patent rightsand issued li censes. Manyind iv id uals and sma ll o rga nizations, do ing privateresea rch, were filing pa tentapplications on hundredsof ideas pertai ni ng toradio, t hus leaving the budding ind ustry wide open toma ssive co nfus io n. Thelicense holde rs tri ed tomeet this ava lanche of newdevelopments by issuingwarnings to developers, inventors, and all those whowere act ive in the field, includi ng those who purchased radio parts fromdea lers and jobbers . Thewarn ings read , " the assemblyof a rece iver is o nly fo ryour own private, experimental use, which includes broadcast rece ptionof music and e ntertai nmen t, not for broadcastt ransmission and NOT FORSA LE ." In o the r words,lice nses had to be o btainedfirst by dealers or jobbers,manufactu re rs, o r assemblers to go into business .With such regulat ions,back-door trad ing becamecommonplace, and manyinstruments fo und o ut letsdesigned to ci rcumvent therestrictions.

It was to be expectedthat to satisfy the demandof the li sten ing pu bl ic,t he re would be concernse ngaged in building and assembling receive rs. Duringthis period, it wa s notpossible to standard ize a nyspecific design because ofthe extremely high rate oft u rnove rs a nd obsole scence. The radio a mate urwas busily building andassembling se ts for hisfriends and ne ighbors, who

101

in .~

2';5 FO U RT H AVENUE NEW YO RK

the type La place into thehands of the uninitiated .They were mean t for therad io amate ur and experimenter.

For sho rtwa ve re c e ption , wh ich in cl udedbroadcast, the int e rn alc a p a c ity o f t he tubeproved a bar to a nystraightforward solution .Rea liz ing that the vacuumtube was at the hea rt of theproblem, Major Armstrongcame up with a sol ution inthe c ircu it principle namedthe heterodyne a nd superheterodyne . It is based o nthe mixing togethe r of twofrequencies in o rder to p rodu ce two fr eq uen c ie swhich are equal to the su mand difference of the othertwo. 1n so doing, an intermediate frequency wasprod uced which could bemore effective and responsive to the characteristicsof the avai lable tube . There sul tant ampl if ic ationwas a compariso n of thevoltage applied to a seco nd detector in the ci rcuitto tha t of the incoming te rminal voltage .

A receiver bu ilt alongthese line s required a serie sof 6 to 8 tubes and gave exce llent amplification. It requi red skilled manipulation of the co ntro ls, sinceadju stments had to bemade at numero us pos itions to track the freq uenc ies of the incoming signal.Sens itiveness of the supe rheterod yne re ce iver wasproven by Paul Godle ywhile a t And resen. Scotland, in December, 1920,when he logged numerousAmer ican sta t ions duringthe tra nsa t lantic initial OXcontest, related in pa rt Vof" T he Hist ory of HamRadio."

In anal yz ing the vari ousci rcuit combi nations of theheterodyne, it was foundt ha t the o peration of thesyste m proved a little toocrit ica l, especially since,to avoid interaction, individual tube s were required for detection andfor rectifi cation . As a

rece ive rs fo r t he monitoring of phone and/or co ntinuous wave signals . Itcovered 160 to 450 metersand was designated theth ree-coil ultra-audion . Itwas designed as a sho rtwave regenerative instrumen t composed of a seriesof individ ually-wired sectio ns and was hooked upas a compos ite asse mbly .Hardl y a receiver for useby the gene ral public .

Rece ivers could be assembled following the circu its illus tra ted in handbooks like the one issuedby M. B. Sleeper entitledRadio Hook -Ups. The illustrations basically used aco il or two, a tuning co ndense r, and either a crystalo r vacuum tube detectorplus a pair of headphones.The tubes ava ilab le wereleftovers, des igned duringthe wa r by French, Ge rman, English, and American laboratories.

They were not very reliable and rarely gave uniform results . It was not unco mmon to find a backro o m laboratory co mingup with some exot ic tubedesign. The intent wa s totry to improve such und esirab le cha rac teristic s a sexcessive fi lament currentdra in, objectionable intere lect rode capacitance s,and short -lived filamentemtssron.

The radio literature ofthe 1920s carr ied instructions on how to assemblereceivers ut ilizing varioustypes of coil s (t hese incl uded un ive rsal , honeyco mb, u ni la t e ra l, duolater a l. bi- and m ul t ilatti ce), tuning condense rs(of t he stra ight line wavelength, st ra ight line freq uency, book-type design),vanomete rs. and ve riocoupiers tied to a vacuumtube or two in cascade.

In 1920, the radio amateur a nd the avid listenerhad available receiversmanufactu red under license , They were known asG rebe CR inst ruments .These receive rs were not

the circuit presents either amore negative or a morepositive reaction. The objectionable feature of a regenerative circuit was se lfoscillation, which was uncontrollab le in the handsof the average user. Thewhistles and howls comi ngfrom the lo udspea ker o rhe adphones we re shoc king and became un bearab le.

Under suc h unstablec o n d it io ns, the rad ioamateur c a me up withno vel innovati on s , especially when tuning tocontinuo us wave signa ls.When using his audiotrontube or his Mar coni ,De Forest, Donie, or Connecticut "vacuum bottle"fo r t hat critica l adjus tmentt o b ring t he re c ep ti onunde r co nt ro l, t he presence o f a magnet in t heproper vicinity of the tube,held at certa in angles tothe bulb, would increasethe intensity of the signa l.Close adjusment of themagnet gave excellentresults.

Early in August, 1919,the De Fo rest Company announced o ne of the first

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very broad tuni ng, unstable, and consumed agreat deal of energy, operating from dry ce lls andsto rage batteries . Radioreceivers whi ch could beo pe ra ted from the sta nd ard 115-vol t c ircu it hadnot yet a rrived ,

In 191 4, Major Edwin H.Armst ro ng invented a rad ioreceive r circuit known asthe re genera tive circuit. Heobta ined a patent fromthe government on October 6, 1914. This c ircuitdescribed the use of thevac uum tube in a detectoro sc ill a t o r c o m b ina t io n.Va cuum tubes we re atthat time only in the experimenta l stage, c rude lyc o nst ru c t e d, unreliable ,and not readil y avai lab le.Conseque nt ly, ve ry littl edevelop ment took p lacebefore 1917 to test theunique appli cation of theArmstrong circ uit wirelesssignal reception .

The regenerative principle in the circ uit is mostsimp ly described by sta tingthat when energy is app liedat the input terminals of ac irc u it connected to avac uum tube in osci llation,

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the inherent design faults.About th is t ime in the

e ra o f wireless evolut io n.

able.Well known. in 1922. was

a re ceiver c a ll e d theneutrodyne. It was desi g ne d a ro u nd a nonregenerati ve a nd non-oscilla t ing confi gurat io n. Whenproperly constructed andassembled. the one thingthi s c ircuit did not do wase mit object ionable whistles. The neutrodyne reliedo n st ra igh tfo rwa rd cascade amplification of theincoming signa l. It startedwith one or two stages ofradio frequency am plification. then detectiona nd reinforcement witho ne. two. or even threest age s o f audio frequencyamplifi cation . It was apopular receiver in its dav.The set suffe red from a nun du e a mo unt of inte rna lnoi s e . gen erated andamp lif ied due to mi smatched component parts.inte rna l tube disturbances.and la ck o f sufficie nt tuning controls to balance out

re sult . tuni ng be c a memore com p lic a te d . Enginee rs remarked tha t ifsome way could be fou ndfor tuni ng adj ustments tobe set and sealed in thelaboratory by skilled engineers leaving relativel ysimple adj ustments to theo pe rato r. t he re c e iverwould be the idea l.

The m a i n d iffi cult ywhich had to be overco mewas the instab il ity from thecombination of high amplifi cat ions desired. The solution hinged on overco mingth e generated osc ill a t io nswhen the number of tubesof the 1921 ·1922 vintagewere hooked to one anothe r in cascade. Much effort was expended in des ig n ing intert ube tran sformers of ai r-co re. specia liron-core. spec ia l co u plings. a nd windings. to ba lance the impeda nces fromstage to stage. Instabilitywas the proble m. again depending o n the tubes ava il-

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S1l)95

Model EL·l058,o.OogI 0... 'OlIN:.... "'""""e-.... eon- G.-0fId1<011 101........, _..... 2_ 1 · _11.(0.,._ "_

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S7495

•

TUfTS....13 Radio Electronics

209 Mystic AvenueMedford, MA 02155(617) 395-8280(800) 225-4428

OPEN OAILY 9-1SATURDAY 9-6

Zip _

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_EL-5OO1'U .ll19l~~o:e-..f_l t "",I""', CompIo> NumtIOf , ""0u0il!l1O: !Q1IIl VOClor >nilSI'U""'" CI~..r ,• Ill "". f!I N ' " "" <1.... lltt , Il...IOIS_ ~ •..._-......• __... 1 " 1......_.-. ...... . R_ · Ilf__•._·o..tM _ ....C",-,-...-• • ' • I " 11","'

52995 S4995

~~~~~....AUTOPATCH - Ready to go!

g ,.en Kiilrod"Antennas

Model EL-5806_ 'lIN' _ Stlonl"'<c_ ..... '_n...• •·.... _ ..n· '_-• ".,...._ !of 2. 10...._• ."1...... ,....."..,• 1.., 10 fOOl HH....,.ll lCO

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RX·ll0-S229RX·l10S-S269TX-110H-S249TX-110l-S159

Model MB II $285C-.lt ll B.lu"l $315

..... '" trIoS comP<t1eIY __ concOl>\ ,n '8COI>"If_deSoQn_·.. pn:oduC.., ••_,,,..a>-...._n"'_~ ~ .. su__0 _ COSI'_ IOSlofI ..",. _10< tho......." .a COSl bl .... n·"o_ a com_ 5 to.nd CW·SS8 If__

T ~ .... the am. 'eu, band ,ece ''''' ' vou '• • bee"""Oil ing fo, < 11'0 per'ec1 !<;I, lh. newcom", 10o",a le u, ,a dlo who ",a ni•• 10... co.t ' Oee tve r 10moM",.n the ""',on on In" ham 11'001, Of kl,Ine old "me' .....o wan la en . ,1,. ,"".'v.... wi thOul ".""9 10 .".,nd .. toll"no

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T.... RX_ no's saIHl s,... <lnI9n. *'11'1 hogn __!nf'1y _""Iy.•ncl dyn '" 'anv- moo._ ~com_._ '" _ e "'iI _ .. ~"'_........ v", bo<'.-- of 'IS ptooty '" .-gn_.,.. _ • ...,..., ._"9<_nng.!he cOS!",_",-,lOw

Card expirat ion date

Name Call _

Order: _

Address _

City State _VISA

Prices FO B Medf or d MA.MA res ide"ts add 5% salest a ll .

Min imum $3,00 forshipping & handlingon ALL ORDERS.

• Reclti ..... CW _ ....... . , SSB, Lo",.' 5......b.ar>d on 3 S end 1 MHI II.""" Uppet S,~Nr>d on U, 2'. end 28 "'HI 1>0"""

• Bui ll-ln AC ...., _ loud .~ .

• U ClTIIrIG NEW FE..t u lle:: t RX_ "O con--'S10. "a-x t.__0,. c>Iu99<>lI '" !heHoi-no T, T.... r- undo...., btaItKhed *'''' "'• •_. ,1_

A REAL BRE ...KTHR OUGH IN VERSATILE LOWCOST .. M...TEuR EOuIPMENT!

ATLAS RX-ll0

liB II poOy.....:· Conslatll SWR _ ,10"119 - P'I!CO$OI)II lu...,"O 01I,..... amp - H. ,monlC SUppl8SStOf1- Re<;e, ..... ,npul ,mped. nce---malch,"'II - M• • ,mu m POW.... I'. " s!e. to .nl....... - Con1," U(H,lS I'eq.ancy cove••ge 1.6 10 30 ""Hz - P.ee ,s oo" lun ' n<;! 01 a"Y ...."., ~.. . .............In O<'~, ..,Ill SWR o! 1 1

liB" ".Iu.."- F,nes! QUlIh ly. mad....-USA~" -Y,~. Plee,soon. ..sy·lo-<ealI Iha l5 ....<In360 ",.ooul - Opt!Of\lll 3000 ... n Balun Iot'. !w'" Iel>d ....,~""

T he most convenient way to o rderl Ju5t call our C rtcli t C.rd OrderDepartma-nt 9AM·9PM. Your order w ill be processed immediately you 'll be rece iving it even more q uickly than if you'd sent it bym ail. Any way y ou look at it , our same-day service p lus our specialte lephone credi t card service equal the fastest way to shop by mail!Helpful hint : To make your o rde r as c lear as possibl8, fi ll in allinfo rm at io n o n this order fo rm, then read it w hen you call.

• f_J co..._ 3~OOO "HI . 70001500 ' HI . ".000-'4.500 kHI , 21,000-21,:;00kHl . 28.000-29.000 kHI

• All Solid 51.0" , 1I1g~ Pl't1o« "."". OHllIn. E , .cenenl Sen.'t••,ty Sel.';l"" V. and Dynam'cRange 5u"""o' 10 Moal Recel. e'S cu"enllvon 1m. m.'k,,1

Add The nc·no Modu lfl Co fhe RX·"O• nd PRESTO I A Complete Ham Sa"dTransceln , .

TX-110 TRANSMIT MODULE

INTRODUCING THE EXCITING NEWATLAS 110 LINE

A high perlorm.nee Hem Band RfKel••r.1.f8nt..' ic low price.

• " .....-. CW _SS8~_.. .... ....... .....·,.._c_.on .5In.0<J9I'l1O.......... :<>a1Ol'9 .....z on ,0-....

• C-.. of 15 • • " . "'Po" (X 20D ..altO ....puI, ..~n--pIoI...

Mod.220

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Mode l HK ·2$ 19.9 5• S a me e sH K., . l enn a s e 1 0'th o $B w h ow'1h to toco- .po ra le int heir· ownKev. r .

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Mod. 210.; '; '

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Model 221

Model HK-4 $44.95• Com b",. tion on HI( 1"

HI( Jon ...m.. ba!le

Model HK-3 $16.95• Deluxe " •• ight kev• He• • Vbo... no need to a lfach todesk ,• Yr'.ellmoolhaction

Model300

8 RUlliaDaGUlliaaa

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VanGordenEngineering

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HI·maALUN.......I.........1.. 100,•• ,...............,.h.".....•.....~ •••r&_

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· _ ,,·'_ -·"" 1. _ " ,_, _."" ",_".,20_. M'''' ~_ '''__

THE HAM-KEYNOW 5 MODELS

•

Model HK·5AE lec;tronic: Ke y er _ $69.95

• N. w CoIbinet color- k.y ed tomatc h molt modern re d io equ ipm ent • Iambic ci rcu it for squee zek.ying • Se lf -com pl e ting d o ts &dMhes • Do t memo.y • Ba tte ryop.ra ted w ith p' OI/ i$ion fo. externa l pow er . B u ilt · in , id. to nem o ni t or . Grid block or di rec tkeying . Speed, \/ol ume. ton e &weight CO n t ro ls a ll mounted o nfr ont Pa ne l. • Fo. use w ith e xt er·n al peddle, suc b e S H 1(., O' HK ·4• Can be u$ed a$ Code p. setteeOsci l la to r wi th s t r ei g h t -key . $u chas H I( ·3

Model HK-1 $29.95• Du.oI_~••~le

• '"'"""v ba.. "",'h non , " pru t>t>e.- feel• Peddles . . . ..... ible too" "" ,.... or close

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H..clphone J.ek 80_....'" 0ulH; ,_ lUo, "",,'UI

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$14.30

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o- ..e-"o ""-00» $24.50

HTC·2l 'On1. " """ ~" .. . " ..",." C","co 01"'" 0'0 ' ~M """ "",,' '''m'o, _,.'6 ""...", 100 3ooo +< , ,Ow ,m"" O_.n,o 8-10 Q......

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PC ·l00HMdphone .-F ~c:om""'- .,,_..._ I<Io'I'\I .~ .'...... , ".-~_... -"DO' • • '" !Ill . ' 1000 ""

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$16.95'.

PROfESSIONAL HEADPHONES& HEADSETS

$9.90

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TELEX. Lightweight Headphones

I

HFC·91J""'"''''"_,,",n A«"u'''< d.,., of\ "",,,_""" .""-"<n ,"'.11'.''"''', 00:;w '" SSB '0" ''''''''0''«' e-:IO_.;no_ ..._ .. _ "XI - 3000'" '._.

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• (II'.' ICf• 0 • qI ./ fModel C610

(SW L 6101 Model C 1320 Model C M 6 10 Model CM 1210

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Modll l C 1210 Model CM 1320 Mod el eM 13205

tandard • jc c m • H eathkit . Kiln . C legg . Regenc;y • Wi lson . VHFEng . Drake . And O t h l!l"$ '

LIFETIME GUARANTEE 'NOW ON LY $9.00 A PAIR '

M.l ke /Model Xmlt F req. Rec. F req .

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World Rad io T'Handbook 197.~~ ...__ ... ._-,-..._---------,-- ......-- ... ...-_.. ----'--.-._-"-'-'- -- -- -'--"'-'._._..... .._-_.-' .::.::.::.:........._.,~-.....'---_., ---'''----,~--,....._..._---.::::-_:':':':•. ,·Go......::~..._.....

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M od el W5115 1' Self-.u ppo.,ingl$850.00

HF Verticals 10-80 Meters. ,,!f id e m tOP .ing • f iborglasstriP forms . e namot illd wi,e coils• sol id al u m inum caPlICitOfl . notunirtg requi red • f u ll co mp. eslion Glam p . • omn id irec t io n alc overfllle . reinforc ed base . m asto r groul'ld mount ing .p..mar kedMlC t ion s • eas y assembly . sup.r iar Qua lity

3 BAND 2 0-1 5 me,.. lIModeiAT Y. 3 $49 .954 BAND 4 '20'1 5 ·10 mete r s!Mode l ATV-4 $89.955 BAND 80 · 4 0 ' 20 ' , 5'1 0 m e t ...sI Mo d e l ATY- 5 $ 109.9 5

SST T. I RANDOM WIREANTENNA T UNER

A U bUld o~ration (1 60.10 m o:oto:on ) . i1e ny rand om le"lth of w ire . 200 weU o u tp ,pow ", capability - will work with virtuaUe ny tl'Ul sco:oi.-u . l dooe\ (a t p ortabl o:o o ! hpmo~nbon. G r..t for e pBrt mo:on u and holoro oml - sim p ly nln e ... Ire insid o:o . outwindow o r e nyplece a veilaNo:o . Toroid uduclOF lor small size : 4- 1 /4" x 2-3 /8" " 3 'Buill-in n eon 1un..u p indieator. 5 0-23e onn o:oet o r. Attte ctiY o:o bronze flnish..d 0:01e toeure . Only $29.9 fo

SST T.2 U LTRA TUNERTunes out SW R on a n y co." fed a nten .... Iwdl as random wires. Works gle at on ,b an d s (160-10 m e tn s) wi th any transceiv.r u n ning up to 200 wa ~~1 p ow er o u tPut.Ieere ase s u sab le bandwidth of any antenruT une, out SWR o n m ob ile whips Ir o'Inside vour cal' .U.... toroid ind ue to r a nd specially m adclplelton (o r smaU siu : 5 '..." X 2 '.. ' x 2 ......R ue , ee1 . yet compac t. A tttl,cuYe bronlf inishf,d e n closure. S0- 239 co .. C'O n nec tOIe re used f o r transmitter input and C'O.X he n ten n a.. Con vemee t b lndlll& POlts Ue Prtv>ded for rando m wire . n d grou nd C'O In ect inne, Only '49 .9 fo

SST T_3 IMP~DANCE TRANSFORMERMi tchel 52 o h m coax t o the lower imp,...anee o f e m obile w h ip o r ' ·ut ical. 1vosi lion s witch wi th taPI , p l""d b etw",n. nd 52 o h ms . Broadband from 1-30 MHWill work wi th yl rt u ally UlY t ransce lyet ·300 W.U put p ut powe' u p.b ili ty . S0- 23c o nnecto,s. Toroid in d uc to r for small si z .2-3 /4" Il 2" x 2-1 /4 ." A tU'ac u ve b ron!finish. O nly '19.95

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SHIPPABLE

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I.ONC UT EUMlN TlUMI:NT PlAMET EIlTl·."'''G "ADlI 'SfOIl,",.. ltD G.. INTIJl JIllTN I5" 11 0 1"llt:~"EN{-Y

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HF MONOBEAMS10 15 20 METERS

10 Mnlas

10-15·20 METERS

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KAIOIlI.NG · XlOO .,. . n $ OOEP.aou UOOGTMlOIa • • • , .,.

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$259.59complete

COMMUNICATIONS WITH ATB·3 4

BEAM 1,

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4 ELEME

ENJ OY A NEW WOALD OF OX

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_,10. _ _ .... _A.R r· 11. .. 0 . D. " ...,__ ..... I __ of 110_ _ . 1 _" Ioo.. ""J__....hoI.. 10 1· 111: - 0 . 0. _ no., C'l' _

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3 /4. 1e1/4. 2 MITI. IIAMS

HIGH PERFORMANCEVHF YAGIS

•.. .. TW'" ' Goooo .... _ .. _ , _ ......... _--- -.... .-...._ - ......... . _ 1I r n .... _ , , "'''.,_- tD"" _ _ "'" ""__ __.... _"',......-

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... .. " "" _ .... , _ .. ¥H'P.L'NP _._-_ - .--- __..--- _.._-_ _-.. ....._..- ...._ ..

D'''''' U..,._ . on YPK - 00-- _-.....- ..._-_ .........-._-----.."."",.."-.." '-",,,..,,'......-

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Am,'ou' No''11 , ~5

51995

COI<fYERSIOfoI KIT.lRX·2K

Fo< >l ad ,nl/'AW-J 0 ' A~·S

A'()"('or AW-IO

::"u, eraft h.. Oretl ted .....th• • tint by maIl inr tho...rId·• ..-t _ Jar 2 _to.antenna IlO'ko .. rood·I1Io ....... Rinro Ran,.. ia dov~ from tho bpJt

' R.2 . ilh thrM half w.'.... in pll and • _ oir hth".~e mak hinr , t .. b. Rinro Ran ';Y"" ... nl......ly_ uP of radiation for botle• • i......~. It ia:unabaf ",",u a br'C*I f""'l ......y ran,. u>d prrteot ly...k ht'd to M: ohm ooax ,

.lRX ·2 . 121-110

.lRX ·220. 220-225

.lRll ... SO. US...SO

_ po rlo. .... t..-~. ,..1 ''''. , _ ._.____ ,--.100.. _ C'O "","II, , 10

,.. _ po.un . k.... _ .. p " . rood I '" _ 10

01 broocl " •• .....-._.R . OM _ II _._ . .. " 0" _ 1/." . ... _ 11. ...... 011.- n.iOk . 1 Ioc. n. J _ ~ OI_. _ 100.. , J/O" _ , I '~._. n.o_IOol_ _

... I ~/t~ - I ,n " _ . IIU b - Y)' POCO

..-_. Bropt'..' ...caoIp!&looI-. ooIJ-_' .. ... , S/. " ...,,,. :I _~ .~_ I "". __ ..__.... All __, bo 001 lor -'_1 or

n _ 1po!a. iu._.,... IN__I_o4l b1 ol..- • • ,_ .. _

.\<."11 '" lIu i lt~...... I, 10. ,,' .-..:t $:I __• -r-••• ' R ......,.. _ -rUol .001~ .... .."" _,.,...,_ .....rl .._,.

-~- ,- .- .- 00-

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ro.. llI..L DUAL SlAC''' lITi_ _ .1''''''' '..~ _ .._ _ .. lNo_ C (>. h _ . ...- ,.-.- _._ ' 1 • • _"-.. • •_ __ _ dlor_-. .. _ _.",,_.....oo .. .-.. ",to . ,,·>oN .."' _....__ ,... _ .....". II ...,.

>dol No.~m · S K

jM-SK

,.-

e S e 6 • 10 I LiMI NTS

6 METER BEAMS

4.5 dB' - 6 dB"Om nidirectional

GAI NBASE STATlON

ANTENNASFO R

MAXIMUMPERfORMANCE

ANDV ALUE

RINGORANGER

for FM

. -......... ............ " _-- _...... ..-..,. .....---A'ori< r..n q..~tinr into rMn' repeat... and n lHld l ho-.di.. . of fOU. d, ,-..,t .....Iaou .,th tho .... Rinrolanr:•.r "" ca n up date ycMlT vr-nl AR-2 Ri......1Ih lhoIimple -.Id,tion of Ih ia ute...... . k,t . 'Tho- kil i l..oe..... pll inr notwork and _.,. olomont ut ionL1lI0 ly modil\cat...... I't'q .. irod OR y to mak ..~iu in the IOJI Mction of ,....r antorn....

189.95164.95209.95169.9 5154.95279.95

lM'C~OWAVE

II.TEllFe OMPANY, ,"c

H'IIlIesl qua'ty, Ame<!Can·made -brand't,anStSlors ate f" ty p<tl t~tlld lo< VSWR.. ""n and ove,load , 'e ve' se pola" tyH'IIhty e~ecl ,ve ~at ..n~ ",g as.u'e . long.te. ""able pertormance Blac~ eflO(\lZedconte.,..... ". <;lus"" KL~ .... 'usoon. ,1>.1.. H ..n, fu ll '-"!Ilt> ftn. onboth .i.-.l

PA 4·70BCPA 15--60 BCPA45-- 120BCPA 4-40CPA 15--35CLPA 15--11 0CL

.....av."",·...' CH" ••,. ",' ., ~ , ,~ . • ._-0- "", """~- ......,- ,_....',.."~_-" .... ' . _' ~' " ' ' 20 '''• """_ ~k",'" _~.• ' ' ''_ '' ~~_" '" • 0 0__' " , _• "",, ' 0' "" ' " ,. ....." , .... , -...,

. '..~~ ' _"'"0"-"

THE@lbl D),~ELJABLEIIEYCO

"W 2VS" aNTENNa COILS

.... ARMED F ORCES F A C I LITiE S - ARO UND THE WO A L[- F OR OVER 10 YEAR S!COM PL ET E KIT (Nothing elsneeded )

• 2 ea. W 2 V S AEYCO KW-4T R A PS• 1 ea , W2 A U 'BIG S IGNA LBA LUN 1: 1• 12 0 F t. RUGGED #1 4 .Str a nd Copp..r Wire. 2 ea. W2AU SH A T T ERPROOE ND·sula l0rs• IN S T R UCT IO NS• $ 48,25

• Negligi~e insert'on loss on receive.

• American made by KLM ,

-,.~""~.,,,,.

UH"",," 0""''''' ' '_~,,,,,,.__• • On" ' ~ . .... " ..'.... '..... e--"". . '_~,~._~" ~,. > •-~. ",..".... "" "'~., . .,~.., ' ..~,~-'.. ._' _,:~~:::l ...;:'.::;" '~~ : ~:~=~I=-

W2AUfVV2VS.5 BAND10/80 METER ANTENNA KIT

bV UNADILLA/REYCO

GIVES YOU OPERATION ON10. 15.20 .40 .SO METERS( DE S IG N E D CL OSE LY T O 5BAND T R A P DI PO LE PARAM.ET ERS PER A.R.R.L. H A N DBOO K. HF ANTENNA CHAP.TER 2 1 ' A MULTI B A N D TRAPANTENNA' )

Eve' v Componen t o f T hi s K it is aHig h lV Crafted, old Line UN·A D I LLA/ R E YCO PrOd uc t Ti m eTested b V HA MS. COMMERCIAL

tt I IICOMI

KLM RF Power Ampl ifiers

• A simple. adc-on-nnrnediatery Manual, eemcte-posmco switchingRF amplifier. is optional .

• Merely coa x-connect amplifier • Models lor 6.2,1'10 meters. 70CMbet ween antenna and transceiver. amateur bands plus MAR S coveraqe

• No tuning! Etficient strip-line • Two types: Class C for FM lew.broad band deSign, Linear lor S58 ,1 AMi FM/ CW.

• Automanc! Internal a r -sensorcontrolled relay connects amplirierwhf!never transmitter IS sWitched on.

New Model List PricePA 2·258 $ 74.95PA 4.70Bl 189,95PA 15-40BL 109.95PA 15·80BL 179.95PA 15-160 BL 259.95PA 45-14QB L 219.95

• An extremely '''9Q&d, h' 911 qual 'I~ . rad IOWill! 15 channe l capac ily• The 'C s,ze cells may ee replaced ""thrO!'Cllargeat>e ce ll s 01 the same size and verys,m~e mod,lication maoe 10 p,ov,de FULLCHARGE f,om elthe' the auto elect"ca l system 0< the IC·3PS powe, supply wh,1e theIC -215 '5 in ope,at ion. ThIS leatme '5 POSS'bte due to 'he BC·20 baUery pack andcha 'ge ,.

IC·215 -$239.002 Mei er FM Port able

..$26,50

"'.50$26.50

$14.50$ 26 .50

so$26, 50

$28,50

$,.. .50$26 5D

"

""""

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PREAMPLlrt R"F d8 WIllED,

rsao

ao"

Tempo

ac..ze....ac"

DEL UXE.lIN se

s

SPECIFICATIONS:Po",e r: 6 VOC to 18 VDC (12 VDC

' eco m m e" d ed lSi ze' e. S,ngleSlage : 1" " 1'4" " 'I, '

b, Double n age, 2" " 1 Yo" " "'''MOSFET , FT 0601 . 500 MH z.dual·ga le 1--==------ - --------------------

di ode prolecled MOSFET

loO......o.<:<:nlO."•'.-.... ..~-~- ........_._'OMOL ',,,,n lO.'"'.....-...._ _ ,,""" ......_... ...-~"'- " • • 00 .. _ _ ""OX

channelsin the palm

of yourhand

Tempo presents theSl SYNCOM. ..the world's

first synthesized 800channel hand held

transceiver

2 METER

""'AIRC RAfT

""b METER

'"AIRCIlAFT

SATELLI TE

HIGH BAN D

11~ METER

II

DATA SIGNAL, INC.

so 10 S4

FREQ,(MHr)

U5 10 13'1

215 I" )00

no 10 225

108 10 144

1% to 174

144 to 148

T his amazing pocket sized rad io represents t heyear's b iggest breakthrough in z-meter comm un icat ions.Other units tha t are larger , heavier and are simi larlypriced can o ffer on ly 6 channels, The 5YNCOM'S priceincludes t he battery pack, charger , and a t elescop ingantenna. But , far more important is th e 800 channelsoffered by the 5 1. T he opti onal touch tone pad show nin the i llust rat ion adds great ly to its convenience and wehave available a 30 watt solid st ate power ampl if ierdesigned to give the 5YNCOM 5-1 th e fl exibi l ity ofopera ti ng as a mobile and base st at ion as w ell.

SPECIFICATIONS

DELU XE RECEIVER PREAMPLIFIERS

Ideal f or Receivers - ConvertersHigh Gain - Low Noise

FEATURES:• Small size. Inc r..ases senSl!lVUV of mosl , ac..'ve"• Gold-plaled cop pe, shieldIng• S,ng le 0' dou bte slage mode ls• Diode p,Olacled. d ua l"galed FE Ts

......" 0.00.." . ... ... " 10_.f., f,,,,,u,...,, ", _.,,'....2 ""9" O' """"'. """" ,,_) . " 0' .,_O<l ...."'"

,_, c.~.... ' ~",0 • ....-r ...-._._" ..-c.. _ 0<0," ,,~. _ _ ... .............~.. .,_ ~, _.-

-"-' ......0_ .. _ • • ,_. ". ~~ " • . " •. , • • ~.. ""-' -..,-,..--- ..... ,_ ...._.

_ Model T A-33. 3 elements. 1 0 .1dB for werd \lollin (eve- isotropic:sou rce) - $264 .00- Mo d e l T A-3 3 Jr.• 3 el ements,10.1 dB f orwa.d Oain love . Isetropic source) - $ 191 .00• Model MPK _3, 7500 Wattl AMICW and 2000 Watts P.E.P. SSB$67 .75• Model T A-36. 6 elements$392.75_ AK.60 mast p late eceo t ..$ 14.50• Mo d al CL.33, 3 elements$30 4.75_ Mo del C L·36, 6 elementl$392.75_ Model CL-203 , 3 elements$290.00- Mo d e l TA-40 KR - 40 m e terconverl ion kit - $ 1 19.50

WATT BATTERY CHAR GER110 V · AC Cha.ge• . . . usa W C·12( $ 19.95) for 1402, 1405 . 1407,2 202. 4 502 ; use WC· 14 ($ 1 5 .95)fa. Merk u, IV.A CC ESSO R I E SBC 12 - $1 4 .95CI GARETTE liGHTER M0 8 1LEPOWER PLUGSPEAKER MICSM 1 _ for Models 1402, 140 5,140 7, 2 20 2 ,45 0 2 .SM3 - (Mark II, Ma,k I V )SM2 f o r Mo de ls 140 2 . 140 5,1 407,2202, 4502. ($30.95).RECHARGEAB LE BATTERYPACK SUse the follow ing N i.Cad PackSfa. the u ni t you select:BP·1 - 1 0 lo o se cells - 5 0 0 mA( 14 0 2, 14 0 51- $ 18 .95BP·2 - strap p ed cells _ 600 rnA(1 405.2202, 4502) ~ $24.9 5BP4 - Ma.k iI. Ma.k IV pac k $20,9 5BP· 7 _ 1407 S M h igh p o .... . p ack_ $24.95O ther opt ,ons include : To u chTone@) Pad (installed o n ly ), TE · 1T o n . En coder , TE-2 En c oda rlDecode,. BN C R u bber DuckAnt.nn.. TNC R u bber DuckAn t.nna.

.........0._a-."".., '0,__•r oo ,"' ~••""" _ _ ... _ _ •- _ - -.. _.~._", ..,"' "M'" _ .., ..~ _" ~ ._ ~ ..._ __.._,- ,~ , _-_..... ... "..... '.. ',,. _.- "fl_ _ .-__ 'K

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I e SAVE YOUR RADIOI

t' Ii'

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high .low p ower OPtion switch ( 1or 12 wans , whan u sed mobile orbase ), built ·in co n n ec to rs f or e ,, ·t .,nal . n ten na, speaker andpower . Whether you·.e ju st g.t ·t ing you ' leet _1 o n two·mete~,

O. a seaso n ed amateu" v ou' ll findt h e WE · BOO t o be th e most lig h t·w eight, lIerlat ile base/mob il.;por tabl. rig on th e mar kel today.T he WE·800 ce rnes c o m p le t e withp lug -in Ipeaker .microphone,mobile moun ting bra cket/ha n d le ,rub ber lie" antenna. 1 2 V DCCha ,ge. Co, d. ins tructio n bookletand 9 0 day limited w arranty.R e c hargaable inter nal b a tt e rypack Optional .

LEAT HER CAR RYING CASE• LC-1 f o ' 1402 S M _ $1 8. 95• LC·3 for Mark II, IV - $1 6 .9 5• LC-2 _ all others - $ 18.9511 0 V - A C DESK BATTERYCHARGERFo. new un itt Mark II , IV - usethe Mode l BC·2: f o r Models 1402,140 5, 140 7. 2202 and 4 502. usaMod•• BC 1. $ 40.95

~ • . B ' , ...,,, ,.

~•. B'.".", _ ~ "' ..

-~.,<>-,- -• ,"""... T,_ .....,,'U"•.·...'-' .... ~• __ , _ " H ..",.._,~._' <-- b ' " ~'''_'''·"' ....~-.. .... .._ ... ~."' - < .........._-..._---.......-......."-- -...._...._--,--,- ... ..,,, '"''''" - ..,- ,.. ..,,, "".... "' ..

~'" " '·"0-00' ." "... " ......... ' ''fl " , ,,

NYE VIKI N G S PEED_X KEYSNYE VIKING Standar d S~ffl-X keys reatun smoot h. ad justab leb ee r ir\l s . h ea vy-d u t y silver co n tacU. end art' mo woU-d on a h ea vy0 ....1 die cut baM> with b lack wrinkle f inish. A ... ilab i.. wit hstandard. or Nevy k nob . wi t h . Or w ithout sw itc h.. e n d with nick elo r brass platffl key arm and hard ware .Pam per youneif with e Gold.Pleted N Y E VIKING KEY !Model N o . IJ4-3JC-004GP bas e n t h e s m oot h act ion featunl c fNYE S peed·X keys in a I p ..dal "'preM> n tat ion" model. AUbard were 1$ h ..avily ,aid plated and i t is mount ed On On ylC ....iJr. .. jetblack plastic s ub -bu!!. Pric.. 150.00

CODE PRACT ICE Sf:!

NEW 2 ME T ER MARK Ii ANDMARK IVA I the smallel1 size hand-heldseller ma. k. ,..,., the .adios featuree "cellent adjac..... t c h a n nel ....eet;"; ty, and innermod /image reject ion. T he a ttrac t;.... b lue-gravLe"an@outer case il .ugged anddu.abl.. Ma,k II ( 2. 5 watt)$229.9a Ma.k iV (4 w att)$ 259.98

R iding the c res t of t he new walleo f ....... Iti ·ch.nn.. two·meter r igs isthe Wilson W E-BOO. Designed a san all -pu rpose mobile o r portableunit. th e WE·BOO is lo aded w ithe nough fealu'. to sat isfy e ll""the m OSt diw:rim in at ing am ateur.The " BOO" is for ch a n nels, from1 44 to 14 8 MHz in 5 KHz steps.u p Or d own 500 KHz for y o u rlocal repeat... . There ar e ellenpro ... ili onl f o r pre-programmingf ille 01 y ou r fallorile Irequencie!'o r c h a ngin g t o two option al onsets. in ca se vou. area repeate r isnonstandard. Add to these feat ure s; inte.nal 'ech a , ge ab le p o w erpack optional (use!' 10 A A NiCadc ells. n OI incl ud ed), detachablerubber l ie" a n ten na, b u il t -in$-mete r /outpu t i n dica to • • b u ilt -in

beige colored base," 4 Y." , weigh t 2 ~

1979

' H E " LIG H T N I N G BUG"'IB R OPL EX H igh O u al ity Sigals at All Speeds. F lat p .....dulumlOdel. We ight 3 Ibs. 8 o z. Stan.a .d _ PO l ished Ch.omium topa rn, g rav besa . $6 5.00tandud $49.9 5

' HE IM PROV ED "O RI G IN AL"'IB RO P lEX. Suit a ble f o r A ll:Ianes Of Transm itting WorkJhere Speed and Perfect Morse" e Prime Es sent ia ll . Th is greatew Vibroplu, il a smoolh andasy wo. king BUG. It has wonoma o n land end "a for itsladIY , p .ecilion end e e se o f>anipulalion. Can be slowedo wn to 10 wo.dS pe. minute OrISS Or gea red 1 0 as h igh ' ate of:>ftd n desi .ed . Mein tains the.me high quelitv signal a t what·""r w>8M1 , insu.ing e esv recep,on under all condi tions. Weighttbs , B oz. S ta nd a rd $49.9 5

!elu"e _ Chr o m iu m base and)P parts. with jeweled movelent. $65.00

' H E .. C HA MPION" VI B R O· I -!LEXleight 3 Ibl. 8 oz. W itho u t ci.cuitlose,. S tandard fi nish Only. 0"'0.ium f in ished t op perts. wi threy crystal base. $46.50

.-".,

There'S,nothinglike It •

' IB RO- KEY E R'ver t h e veil" , we have had manyJquests for V ibtoph,,, par u to besed f or co ns truc tio n o f a k ey ing' ech a nism for an , e tec r-o ntc·a nsmini n g u n it . This beauti fu lnd most eff ic ient "Vi b ro Keyer"; ide al f or t hi l job .EAT UR ES OF THE "V IB RO.EYER ", Bellutifulze 3 ;-'''ounds'Same lar ge lize COn ta c t l as f urished on O"u". Vib.oplex .'~me ma,n frame and sup e.nishad pa,tl al Oelu". Vib,o,..'Colorful red finger and thumbieces.Ha s the sam. smooTh and easy

perating Vibrople" t.u nion levelA .eal " G em" adjul1abl. to sui t

Our own " tas ta"ta ndard - $ 49.50; Deluxe F Inisn65.00

AO IO A MA T E U R CA L L BOOK. 'r nere's n otnlno like it! F oreignad lo A m.ueu r Ca llbook OX Llst

,gs - Unite d S tates C all book II K &W Listings.514.95 - OX $15.95 - u .S_

"C.. ...

S LINKY! $ 43.95 Kil A LOT ol.n.......;n a LI TTLE .".<0 N.w Sl,n~,,\!9d.t><>I.·

w ith h.lio<;aI lOading ,.o.atn • 110<>"oign.l • • li tO w.......ng'h 10"11'

T h is electriclllly SfT\ltll 80/75. 4(& 20 meter antenna ooer"" ..any length from 2 4 tQ 7 0 ft . • n (extra balun or trensonalch nlNd..:• pe>nable - «eets & SlO'" irminut..s • small enough 10 fit It

a nic Or apt. • lUll legal po.... , flow SWR o "lIr complelll 80175,4 0 & 20 meIer bands • muc~

lower atmospheric neMse pick ,ufthan a verticIII & ....eds no 'ediah• k it inci. II pro of SPKially-mlldt4 " d;a . by 4 " long coils. conts;ning 335 ft. ot radiating conductor. balun. 50 ft. RG58/Lcoax , PL259 conneclo' . n"IOI'rope & manual .

• 02.1 ..'" ..n", " IU"' ".m.",0"1< . ".".'.d ~... no..........'.~"""••, .•9IN C ... "CL'....0.,.,. ...)..,.....S VG·:W••~ ..

.n. INC .I~. '0' n.'" ••"._......I N C T E l .".' T ••.)..,....... VG ·'" Ad 2s ..c pl.p , .. 31 -00. · 0 '0 ,."' INC "'" ""p-11." ...

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AST A T ICMIC R OPHO N ES

::::-A·.-:'-~---

TEXAS RF

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TR A N5VE RTE R5,M MT 144/ 2 8 2 5 9 .9 5MMT 144/ 5 0 2 59.95MMT 4 3 2 / 2 8 S . 329.95MMT 4 3 2 / 5 0 5 . 329.95MMT 4 32/144S . 38 9.9 5RECE IV ING CONVE R TERS,MMC 14 4 / 2 8 65 .95MMC 144 128LO . 7 0 .95MMC 4 3 2 / 285 . 95 .9 5M MC 432/14 4 . 95.95MMC 1 2 9 6 / 2 8 . 85.95MMC 1 2 9 6 /1d4 85.95VARACTOR TI PLE R ,MMV 1 2 9 6 . • • . . 11 0 .9 5ATTENUATOR5,MAA 16 . . . . • . . . • . 2,7 .9 5

MICROWAVE MODULES

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PP·2pp.,

M series is fo r mou nting to SUf

faces inaccessible fr o m th e re arlwalls, mobiles, systems int.nf_ce,oanels, tes t eq u ipme nt ). K se r iesIS s ..lf-contained w i th • re l ayinside the e ncoder. W h e n keys .r.pressed contact closer occurs with• 2 sec. d ll ie v (ad ju stab l e ). Cont a c ts a re r _t ed at 110 rnA II' 28voll$ switched, 500 rnA car ry .PP·2K contains delay ."clusion

for t'J,e f o unh column. HO .......f. I..::..::..::..::..:....::..::..:..::.:....::..::_~:.:.:...jby jumping 0-5, 4th column isrestored, Unit is op....abl. trom4 .5- 6 0 volts at temperatu res h o m0 ". 1 40° F . OutPut level wilt dr i"eany tntnsmitter or System. Adjustab e output I....... is c on t ro l ledwith 'lin " " , reme lv stable multi -turn trimpol. w faecess from thefront at the encod. (no t behindl ,saving time for le..,el .etting.which amount. to hours wheninvolved wla ,ystem.PP 1 $55 ( 1 2 keys ), pp 1m $55(l e tt e ri n g opt ional add $1 1, PP ·1K$66 , PP·2 $58 . PP 2 m $58 lIetter ing optional add SU . PP 2KS69 PP 1 A S68 (to r standardc o m m hand-heid I-

cpipoceommunications

The Bencher U lt im a t e P ad d le ...a dual leve r. iambic key_ paddlethat will inc rease your speed.accurac y & opera t ing comfort.• ADJUSTABLE CON TACTP O INT SPACING Precisionscrew adjustments on each set o fc o n t llC ts make e xact settings easy.ContllCt posu are split and lockedby Set sc rews. eliminating theneed for loc k n u t s .. W I D E RANG E O F T ENSIONADJUSTMENT _ Tension on finger knobs is maintained by a longexpansion spring. Dual screw ad·justments adjust spring tension tomatch you' ··fist.··• SEL F ADJUSTING NEEDLEBEARINGS - Keying shafts pivotin nylon bearings that " f :o a t" onmachined brass fittings. $pfingtension prevenu Ir_ play andslop; eliminattlS contilCI bounceand bee klash.• SOLIO SILVER CONTACTPOI NTS _ The contact points aresol id silver for a life time of flawless keying.. P R EC IS IO N .MA C H I N E D COM·PONENTS _ Main frame . contactposts. spr ing POSt and beari ng ringar" all machined from solid bran

polished a n d ch rome platedfor du r ability and ric h appear"ance. The Bench" r Paddle 100l<s asy ood as i t works!. H EA V V S TEEL BASE ; NON.SK ID FE ET F in ished in anattractive black w rinkle f in ish(c h r o m e p la t in g OP tional) . Iheb ase measures 9 . 5 c m x 10 .2 c m x1 ,3cm t hiCk. I t weighs 1 kil o g r a m .and wi t h in non ·skid r Ub b er f eetis as solid as a r ock .

Madel B V- 1 S tandard Blac k Base· . . $39.95. M o d e l B V -2 Po lishedChrome Base ... $49.9 5 .

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a Boom mou n1O'd ..,.pa<I ..... m><'''''-pI'oonor d"j, ", .. ud u.llty . und..lon«l............ prod too.. v."...... ..,n .ontrol10.. you ad",., fo' op"mu m module. .....

a c......._ " a.."p ..... you monl'Of Inpr,n.)· .... _ h. bl to d... u ","o.h.... BIork. out ..n..""n n..1 ...,......100 t.t•.s. of un_k.W. A &<; pl.,,,,

a Hudbo..d ...If .dlU'" fOf .omlorublo...., ""~. 10", h OUR Spnn,·n.. h,nl~

... '" J"" dIp 11._. on and off . "h_, 0 .... h.nd R"~R'W. rOf n lhl Of loft...

a IW._....n boo hunl on ...ncion! m"'''''·p/I_ rl,p

a Compaor, ","1 m h.ld •• Ik • • ".h I... you...p I>olh h...<10 on l h . _ h...1 ro< ..Iffd,,"nl lob .s. of unbn-.hbl. ABS p l. ....

• 81r ,I' ,n F~:T ',.n"&lm .mphf , . d . p"m'••opn" ou' pu' 10 any' .."' mpo-d.n....

• Compo"bl~ . "n m ..... '''0 ••y ,.d ,.,. in'rl uclln~ 40~h.n....1C 8 un,,,

• 8~ , 1 ' ~ " V~l. .., ","d fo, ~..)' mou n. ,n. of,1>. ..1ll . ..".n

• M.M ,n US A'SPI;Cl f IC ATIOSS

•:..ph"n~ ' m l"'d:on..... .nd 11 1><' II ohmo . dyn.m,.

~l or;"ph.. n. ' l'l"': EI ....I ... , ... p. ... o<Mor'l'phrn• .f' . 4 U.""y ,'

....,."..., 200-6000 H.Ampl. r;.. , 'Yl"', • rET I..n.,.'o<>

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('II "1"" '. '0" • Amol~u,'r.dlD 01'<""0'" •r"l; e• • nd f".- ••hid.. . Ambulu<• ••nd.m.,••n.)' ".h,d• • • Tn.. . nd ',u.h.. .M..,n . p l...u,• • nd ",o,k bo.'• • Con ·."U<llun . nd <I _m"lllion r ........ [ndu,"; '• 1. ommu nlro" o n• • s.cu,, ')' p."ol• •A" po,. '0 .... ' . nd l round ... . ",• • II. ·mo' . 1,,0.<I.u, .nd T V ·c.m~.. c,.... .yo ......'" ond f".......eh u n, ,, ,

J. W. Miller Presents...

,j.. $69.95

T_.., ..... _ I wi'" ouperklf_"Elecl.-l-e-tlor- _ ,,*I opftoo . and

p. I.....~ I l ~ ..... . wllC!l.

rOR 8ROADCAST·Q UALITY TRA~S

MISSIOS A~D U:CEl'nOl' rOR 80TlI\!08IU c vrrs Al'D 8AS'r STATlOSS

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$12 5.0045.0038.0027 .5017.00

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MODE L PLF employs a d ua lqa te F ET providing noise fi9 ores of 1.5 to 3.4 db., depending upon the band . Theweak s ignal performance ofmost receivers as well as im <l <jeand spurious rejection a regreatly improved . Overall gainis in e x cess of 20 d b . Pa ne lcontains switching t hat transfers the antenna d irec t ly tothe rece ive r or to the Preamp .Mode l PL F 11 7 V AC, 60 Hz.Wired 8< Teste d $ 49.95

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Th' 4360. 4362 HAM ·MATE Dic.";o". 1w,,,.moter, '" ,n"," io n typo in,"un1<n" (ot m"," , ingfO''''''d 0' «!le"od """,,, In SO-Ohm ''''',i,1"'n' mi" i" n li,,<,. Th.y if. d ir<" de""ond,"" o('h' m<,dd4J THI<ULlNE. W"'mew _ thop'of"'ion.1,tind.ro of lhe ;"o um y --and ...ill'''"f.lt l, m<.,"" RF po... , no ... "no«,ny I"" d,'"nd" ,,,n, ["h ..."",'\<'« i' ",,"oe up of • pre<i",, 'ym"h ,,,,o """ i"n " f 50-ohm lio•• , ro,." bf< ""n,i ng.fe"....n" n" mot" "'fib""o in ...,,". , II mou"'e<l,n . hlgh·,mpa" pl."", h"",,og. It" t hl< 'VP' "fsolid (on",,,,,[ i,,n and th. Oi,." ioo,f THRULI ~ E

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model 4431

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• 6 THRU 160 METERS• TWO MOOELS AVAILABLE• RECOMMENDED fOR

RECEIVER USE ONLY• INCLUDES POWER SUPPLY

• Model 43 Po_r Measurement Versatility.Variable RF Signal Sampllll' (built-in)

Bii\BEkKlronk CDrponItlon

ALL BAND PREAMPLIFIERS

MODEL 4 3E l emen t,; ( T ab l .. 1 ) 2 ·30 M HzElements (T able 1) 2 5-1 000 MH z

Ca rry ing case fo r Model 43 8< 6 e le mentsCarryinfl Case fo r 12 e le ments

thein,1"._._,_.,- , ~ - - -i\i

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Now YOu can receive the weak s;gnals with the Ameco PT·2 p"..amplif ier!Model P T-2 i. a c o n t in uo us tun ing 6-160meter Pre-Amp .pec if ically d esigned for usewith a transce tve r , T he PT ·2 com bines thefeature. of the wel l ·k nown PT with newsophistica1ed c o n t ro l ci rcuitry that perm itsil to be added t o virtu a llY an y transceiverwilh no rnodifice tio n, No serious h am ca nbe without one . Prlce : $74.95.• ImpTO..... ",,,"itin ty . n<I oi~tvl l -lo- noi....Ii" ._ ",-10 oi~l. up 10 26 db.

• For A"1 no ~s u.

• Uypu.... il... lf .u lomahull~ whffl Ih. I,an...ri..r io 1.....milbD(!:._ FET amplifiH p..... "'p<rior cro.. n"'dulalion prolKbon.• Simpl~ 10 in. laI,l. • Ad.anc.,d ool id ,. lal., circuil r~· .

_lmp' o•.,. immunil~' I" Iran....i, ., ironl-ffld ,,..,rload by "... of ito It"ill,in a ll~ nu.I OT.• Prondf.. maol". PO" '" control for . Iali"n ""I"ipm~n1.

~~:~sc~~. p=~~~nan~~YZs;~,a~ts:.~~~et~~r s-::e~~~ c;:u;:::;measurement is made.A mpl itude o f the RF sample is adjustable b y depth-of-in sertioncontrol knob on t he front o f the wattmeter.Model 4431 uses the same Plug-in Elements as t he Model 43 (withinits frequency and power limitations ) .

R EA D R F WATTS D IRECTLY! (Specify Type N or S0239 connecto rs ) 0.45 - 230 0 MHz, 1_'jQ,000 Watts ±5%, lo w insertion VSW R- 1. 0 5. Uneq ualled eco nomy a nd fle l< ibility. Buy o n ly t he e lement(s)coveri ng yo ur p resent f requency and power needs, add el<tra rangesla ter if you r requirements e l< pand.

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:) CATCNG ELEC I RDNICS UMITED

FREGUENCY-AGILEAUCIC FILTERIVIodel FL1

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l59 bit, f i..ld progrl mm abl .. . code iden ·t ifi er wilh built-In . " ut leh ta il ao d10 t imers .... , . • • . 42:9 5wire d and le" e d , nOI program me d , 59.95wired and le"ed , programmed 64.952,000 o h m dyn am ic m ike wilhI'.T .T. an d co;1cord .. . 13.95lone . "ueleh de code' , . , . 59.95inSlali ed in re pea l.." ind udi oginle,fa.. acce..o r;es . . . . . . 94 .952 lone decoder . • . •. 39.95..me as above-wired & leSled . 64.954 po le he lic al ' ''' '",alur , wired &. te.l ..d .,wepl l uned 10 144 MH z ba n ] 4 .9 5..me as a boye lun..d 10 220 MH z ban 34.95..m.. a.abo,e luoed 1,, 4 3 2 MH z ba n 34.95

R F pow... amp. wir..d & lested. em i..ion lW·}'M·SSB IAM

I'ow ..r Pow.. ,In pul O ui pu l

lOW 70W~W 70Wl OW i50W30W 150W2W 60Wl OW f>OWlOW 120WlOW 40W2W 4l)Wl OW 1I0W

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w/fold ·back c u. re n l lim it ing a nd, ,, e,,o lla g.. pro leelion . 274.95

" nll, dn' e s pacod dupl .. ' e r ..2 mt" 600 KHz sp.,·ed dup le.., .wired . nd lu ned 10 f '''<1 ue n<· y ..2 20 MH ' duplex er , wi, ..,J audluned 10 f'e<1ue n ry . .r"'k moun t duple,.. , • ... ..dou !>le . b ie ldr d dupl .. , .. ~ab les

wilb I' l 259 e o n" "cl" rs (pr .)sam.. a' ahoye w; tb ty pe N,'oo nee lo," (pr,)

Band144 MH z144 "1Hz144 "1Hz144 MHz~20 MHz2~0 MH z220 MH z420 MHz4 ~ 0 MHz420 MHz

accessory lilte r for above r e~ei~ er

kin give. 70 d ll adja..n lc ha nne l re jectio n .....10 m lf R ~' f run! end 10 . 7 MH ' ou lf> ml, tl. F froot end 10.7 MH. o"t2 m I. tI.I' froo l end 10.7 MHz oul220 MHz k F f",nl end 10. 7 MH,ou l .. .4 32 MHz RF f",nl en d 10. 7 MH,ou l10.7 MH z I~' m odule incl ud e. 2pole crys lal f ilter • .. .. .45 5 KHz IF sla~e plu . t 'M deteclorau dio and "'l uelet> hnard .

..me as abo'e-w;red /I< lest ed ." .n.mill ..r .. cil.. , 411 MH z..me as aboye -w;re d &. le. l..d300 mili iwan, 2 m tr I'ansmill .. ,SlI me so . b"'e -wired &. tesl ed

C'O R 2 KilSC3 Kil

co l Kit

Crys lals

CWIO Kit

e W IDlWIDMIC I

TS IWIT .TS I W/T.

TIl) Kit ,TD3Wrr .HLI 44 WrrH U20WrrHU ll W fT

C0 2 Kit

UH Kit

OT HE R PROD UCTS BY VH F ENG INEER ING

rx aroe WrrTX43 211 Kit .TX43111 WITTX I SOKil .TX I 50W rr

IlI'lA 220

IlI'lA412II SC-U

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ModelOlC 10 /7 0OLC 2/70OLC I Of l 50OLC 30fl 50BLD 2/60BLD IOf60BLD IOfl20OLE 10 /4 0OL E 2/40IIlE 10/110

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R~432 K it . .

n' 10.71' Kit .

FM4 55 K;I .AS2 Kil •

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REP EATERS

SYNTHES IZE RS

TRANSCEIVERS

RECEIVERS

TRANSMITTE RS

I~q8..

POWE R SUPPLI ES

POWER AMPLIF IE RS

, ensllneerllns

49. 9 559.9549.95

59 .95

59,95

69,95

69,95

44.9571.953 4.9565 .95

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649.95899.95899. 95949.95

$ 64.95129.95

64.951 29 .9 5

74.95131 .95

74.951 3 1.9 5

84.\1 514 2.9 5

Co m plete 6 m tr ~'M n ansceiver kil ,20w o ul , 10 c hon nel ""an with C..e( Ie.. m ike and crysl al.). . . . 259.95. ame" oho~e, b ul 2 ml r &. 15w o ut 2 59.9 5some .. oboye n eeI'I for 2 20 MHz 259.95..me • • aboye n ee pl 10 w all ond432 MHz .,. . . . ••.•tr an""ei~er case ooly , , " ,tra n. ceiyer case a nd accessori....

,epealer-6 me le , ( less crysll ls).re puur- 6 me le" wi,ed &. le. ledrepeater- 2 m lr - I 5w-com plet e( Ie.. crysU I.) 599.95, epea ler - 2 20 MHz-I 5w -cum plele(l ess c,ynah) . . . • .. . 599.95repea l..- IOw I 1l - 4 ] 2 MHz(Ieso c,yslal ,) • ,' epea le, _1 5w.n_ 2 mn, .,epeater-15 wo ll _22 0 MH •.repeuer -I Ow an - 4] 2 MH • .

15 amp-12 yolt ,egul.led power supply wlc ase , w ffold·bock c urre n I limiting ond oyervollage prol ec t;on. . . 99,95same as . boYe-w ire d &. le.ted. . . 134,952~ a m p - 12 yult regu lat ed po wer '""pply w fc..e, w/fo ld ' bock curren llim; l;ng .nd o~er yollo ge prolecliun""me as oboye - w ired on d lesled •same as PS2 5C w ilh met", . , , .ume as .bo~e -wired aod le.ted .

2 mtr s yn lhe. izer, t ran.m il o ffoe l'pr oVam ma ble from 100 KH z -IOM Hz .(Man ofhe ts with o p lionaladapte,,) . • , • . . . . . . . . . . 169.95•am e a, above - w ire d & te. l ed . . 239.95..me a, SYN II Kit exce pt 2 20 ·215 "1Hz .• , • • . • . . . . . . . 169,95~me as a boye-wiud /I< le' led . 239.95

2 m l' power amp -ki l I w in -2 5wuu t will> s..lid sUle swi l c l> i n ~ .

CoSe, Conn.ct" ... · , .• • , • , . •2 m l' p"w", amp -lOw in _40w"ul -relay swi lc h ing .6 m lr power amp. I w in, 2~w o ul .Ie.. c..e , connec tor! &. swi tc h ; n ~

2 m lf p owe, s m p - I w ;n _ 15woOI- less case, c Onn eclo," and

:;;::;~~nJA i4 4i is'k'il ' h'u i :2 5"; :similar 10 PA I 4 4/ 1~ fo, 22 0 MH zp"wer am p --s;mHa, t o 1''' 144/ 1~cHe l" l Ow and 43 2 Mtll

I'an,m ille, o cil e" I wall , 6 m l' .Sam e as a~u~e -w;,ed & tes tedI'an,m ill er exc ile' _ I wa ll _ 2 m ITssam e a. al>o~e-w;red & te.le d.I,an,mine, odter - Iwan - 2 20Mill

28-35 "1H z FM r~ce i~er wilh 2pole 10,7 MH , crY <l~1 fi lle r ..sam. a••I",y. ~ w i r.d &. te" cd.36-60 101H z rey, w /2 pol. 10.7Mill crY',.1 f illN .""me as " bon - w;..., d &. c• •ted14 0-170 101H z rev, ""/ 2 pol e10 . 7 MHz n Y' lal lilt• •. .sa me as . bow - wi ,ed &. t•• te d2 10-24 0 MH z rey, w/2 1',,1.10 . 7 MHz nys lal filln .' am. os ab,ne _wi,rd &. t."ed4 32 MH z rey, w/2 pol e 10.1Mill crys tal filter .same as abO" o-wired & te" ed

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_ ,.,"" l KW PE P 0 Cu,_''''''\I ~ A 0 IISWR@ 50) OI>m, ' .3·' .... to ' SO"' ftz 0 '......'0""",.no «0...." "ogl'g'o,"

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'....... ' . omc,.~O<~ .~

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T _ ...

0 ", '"T••n.~,," ",000 ""m.-~,.. _ ...T_ ~ O m.". .""."''' .'''5"....... " • • • , ,",..._ .""M,,,,,,••,.... "".'...'_.,

Also ...AlA_DUX· ..... Wo....d Coil.Un,form· p,!Cn =""om \i ,"""10 6 ""' , . ..mot... ~ 'ne.... to'0 'ne iO<\g. ' to 32 t""" "'""""n. no. 8 to M . 2< AW(;

",,,,,. , 594----0I'OT

2- moter mobile AT-200 Antonna Matcher. Use your carsAM/FM antenna for yo ur 2·metermobile rig. Tunes from the f rontpanel for max. ou rcu t, min.VSWR ( 1. 2: 1 o r less for mOSt c a rantennas). $24.95

Model 372 CLlPREA MP. G e tm a x im u m legal modu lation withou t danger of splatter .

' ' 'm.._ ," ' ''''.OOO.n,",' ' L_ " .m..... ''' '. 2<l m""...",",",_ a. " ' 0 ••0",,,.., ..._ oa m"".""C"'••' 'm__• 00,0 00 .,,,"'

'._ 0-..." ~..,,"'"..,,.. , ,........ ..... 000'" ''''..".,-- ...~..' '''T..m~.' ".'""...

BARKER"WILLIAMSON, INC.

$ 1 6.7 5

""".. ' '15., n,t"" '0 , KWI'EI'"'ode' '95-. ,,,"" '0 l t<W P EP

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' OO,OOO ••~.•m""..., ,. 2<l ~ , ,, ,yo,,,

' 0 • •"m'h."'R' •.OOO . ' m.. ... " ' . " .. y ,8~ ' U• • • • ,.,...." ,a " .'''" . " ...".,T ~ "' ~ . .." ...,, ""

, . "" , ' m,,",,"~.

,""", L....~..,_G","0.'. "' c. ...0.'... ,m_...,.'.w~

" ....'.."' '",," ".<0 ..,~.

2 How Co..laI a wlto,,"10< w. lt ...__ tnoMod.. 593-5,....... poiO,

3 ' 000'"",,

. ........ "",••_" M H, " " '" M~" . 7~."'.""..._ b..... '" "., _ , ,_2 "'M, _ 4 MH ,.' M H ' _'M H"• M ~'_ ,. M H, ... M H , _ >o "' H"" MH , _ • • M H" .. M H , _ , .0 M~"

"O M~ ,_ ".MH'

~

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Model 331 A transistor dip mo terPortable RF single gonerator .

signal monitor, or a bso rp t io nw a vemete r . Lightweight ( 1p ound, 6 ounces with a ll coih),battery . powered unit is ideal for ..,.field use i n testing t ransceivers, ~~i',"'":'''''

tuning antennas, etc. Can also be If--,·· ''.· :::,--~''''-..,,.,.,,,.,.,,---used t o measu re capac it y . ind u c- ;tance, c ircuit Q , a nd other f a ctors . I nd i sp e n sa b le for experimenters, it is easilv the mostversa tile i n s tr u m e n t in the shop.Continuous cover a ge f ro m 2 MHzto 230 MH2 in seven r anqes ,

Coaxial antenna chan geOlle r relay .Model 37 7 .

Oow.. A. ,,". 'OOO w.M. cw.,_ w."' .... ,~_" L_ ,• •• , .. '. DC .. , .. MH,• • _ A...".~"" • .0' . " '"0'0'. . . . ... , >0 ...' • • Cc~_ _ • UH' To.. SO·" .0 .... _ _ • h" . , ~....,.."'......" , .."'''. , "

- -

--

~ w. nU ' m."m.m,"" ... » . "H,""......, . " "8. o.c ' • • 0M ~,

. ., ••1.1 to.' •• , oc ,. ' 00 MH,:~,~~i":'. t: ~:~.OC '" ,,. "M,,,, ,........

_56'"

'._c_"..-.'_m'.~".~.

••'",...no ... ...'., ~.

s ign ed for use wi th 5 2 · to 75-ohmn o o-rea c nve loads. and a re powerrated at 1000 watts AM, 2000watts SSB Connectors are UHFtype. Insertion loss is negl igible .a nd VSWR is less than 1 . 2 : 1 u p to150 M H,. Crosst alk (me asur ed a t30 MHz) is 45 dB between adjac en t o u t le ts and 60 dB betweena ft erna t e o utlets.

Wide ra nge a ttenuator - Model37 1 -1. Seven r ocker switches provide attenuation f rom 1 dB t o 6 1dB in 1-d B step s. Switches a remar ked in d8, 1-2-3-5-- 10-20-20.Sum of a ctuated swi t ches ( I Nposition ) gives attenuation. Wi tha ll switch es in O UT position,there is NO in se r t io n loss. Atten·uator ins t a lls in c o a " ia l line u sin gU HF co nnectors.

Model 374 dummy l o ad wattm e t e r - T o p o f the Li ne - 1 5 00WATT RA TING Oil Cooled .Our h ighest power combinationunit. Rated to 1 500 watts input(in termittent) . Meter r a nge s a reindividuallv ca lib rat e d f o r h ighestaccu racy.

"00'"""' ....... OC ,.300 ..~,~.... c_ ...~ , . "". "o ....,_.w" A _ ' '''''' w'''' DC ,,_m"_L....... ',..'......"

~".m ""'; "'''... " ...._ A.nO'" . ' •. 0 00, 0300, . , """' ....", c• •_ ,.. "" ,,. i_ ....'~ ... __,."" ". , . ~........ no" . ...' " ,,,..... " " .00

-_.,

6 PROT11 )( ,"" ch G,ov<"d' oil ~'cel" ,<I••" edo"" ,,, t c"c" ,t

!> PAO TAx , ..' tCh G' O"nd' oto ~ . c."t ~lO<; ,.",

"", p"t <" c"" S, . t h ....,' ch """ t'On 9' ""nd,

oil 0 '" "

B,.. , .. on 'Y. ,or 1t mo" n ,, "'l 0' ',",,'ot< o~~O'( 'or , .. ,,, ......

,

,s

,2 S""" ,,, 2·""i~, 2·"",,,,.,., , ..ot ch ""'" '0

...., tch on_ Af d ....,.... ,~ or "'" 0 ' .... '..<o",,~c ' 'On ,n 0 <0. _,,,. h~. s... " u'~ 10_1

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.9 S

17.9 5

18 .50

,.,"""

.... PRICE

'" 1 8 .9 5

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~. 14.00

""', 1 2 .50

.." 17.50

\,todel 333 dummy 10 00 wattneter FaVOrite Lightweight'ortable-250 WATT RAT ING (l,;r Cooled. Ideal field service uni t'o r mobile 2 -way radio - ce,n a r in o, bus in ess band . Best for:lRP a m a teur uae, CB, with zero:0 5 watts f ull scale low power'ang e.....-<."-

~...".._"-...,..............._ ,'"•••."'.-. "'.......~.

COAXIAL SWITCHES AN D ACCESSORIE Sfor .n'..,,,,.~;on"'" R f " " ' Ch,"lI

--iig h Power 1 000 WATT"eATING _ Oil Cooled _ mode l13 4A dummy load wattmete r.) u r most popu lar co m b ina t iOnm it. Ha ndl es f u ll amateur pewee.~eter rang"" in d iv id u all V ca li)rated. Can be panel mounted.

::OAXI A L S W IT C H E S A N D(l,CC ESSOR IES for antenna .., Ie c,io n a nd RF switching. The...l ig h -q u a lit y switches have set the't an d a r d for the industry for' ears. Ceramic switches with sil ·er alloy COntacts and silver· ,l la t ed c o n d uc t o rs give unmatchedlerformance and rel iability fromlud i o f requencies to 1 5 0 M Hz.I &W co a " ia l swi tches a r e de·

_ no

...._~, A._ o.c ,. _ MM'~ ... " '-- ", .. " , ' . .. . M~'Oow.. A_ '000 _~, .,.. ,._"''''""L

w... ... '..h.' ~"'~'m• •• m " m "" "m;'

"""~,.. " _ 0- '0 , " U'O.O _ .o- ' GOO'..... 'CO._,'" .0 ,,. '•• m.'~.", ......"s... • '0.--.._"...~.., '''~.• ,~. 0' ''.00

onl}' 837.95

~.-,. ,-,-• -. """'~ ; '0 •

i " ':.1. '.~. ~.•- --- .• • ••

T,,,,e, In" "\I'K " 0.o ~· uo"'oo,, _ .......~fed ... run,l..m ..-1'"(1641_11I m ele", ).,\ 0 " nol _nl ' I.. 21111_I. KF ",,' .>u•.K" t!Jl,·.I. Tel ,".._1_" .~., - • 2 .... •.2111 -

SSTT-4I ·LTH.\ n ':U:N un.I ·:u:

SST T-3 'IOIIILE"IIJt:"I\..~(:E

TIL\NSFOIUIEIl

SST T-ot (!LTIl.\ T11Nt:1l

' ·!.TN.\ T1 ·x f.M "F.I.l ·XF. \In''·h~,unY. n ,,·n ''8 _

......~ f~<l ... ruo<loo"" ,,"'I'e " 0 lOll " ..0.1~ I HlO.. W;.." ."."" T"o~ OJ," 'he SW K " n "."r 80'<00U f","',,'" .-frl,·leo' "1"''''11''0 " f ,,0\' "~. ll ,,"' e . ",,,bll< .1'""""I,· _",,h 9 ·~2 "' · ~.~ · • :100 " ." " KF...11'.1 ""1'01>111 '" • SWR _ el e .. 8'Uh 2·,'"1,,.....·.,k • ,\ ..1....... S.U.. h .... 1, ..' , 1"""',','0 I" ,,,

,'" ", f" <1 DOl '""''''S. """I, "" ,,'1,,·. ,or h,,"·' ."., ,,, .... .Em"" ,,, , .\1 ..........11 1..... 2nl'l .,f, 11 1110\ ' ,{." 1',,<"1" 'rs ' .\ It ,,,,., I"'" 10 "",' fl" 1,1,.. ,I ,.",'l" s " ,~ .

only $64.95

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~169.00194.00109.50169.0010l.00

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Phone: llOl-6:16-5J45 H ours: 7-5 M on -Fri

COAX

Send stamp for price sheet anddescriptive Information. PRICESDO NOT INCLUDE SHtPPING. W.ship only to .50 Stores. Prices aregood as long as manufacturerholds above list pr ices.

OMMUNICATIONS SERVIC

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BONUS: Extra 3% Discount onmerchandise when order is accompanied by Cashier 's Checkor Money Order.

Trl-Dand DeamsMosie, lA·)). J ele.entsMosie, n·Jl ] ele.etltlH,-Gain non. low PowerH,-Gain TH)MKl ) ele.enhH,-Gain TH6DUX, 6 elerlentlOTHER SPECIALSClsIlcrah ARX·lC,~",h 1141·11C,~",h 1141·22Alliance HD-B RolorHusller-see March Inue of B

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LYTL-LOAD®

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·MONITOR YOUR SIGNAL DIRECTLYFROM THE COAX LINE

·5-2000 WATTS PEP·OUTPUT: .3lv-l.Iv RMS '-'DO WATTS·'NSERTIOH lOSS LESS THAN

.2•• (3-30 Mhz.)·USEFUL RANGE: .5 to 150 Mhz.Eliminate jerry-rigging when you need tomonitor your signal. The CoaxProbe"will work on both frequency counters andoscilloscopes (of proper bandwidth) .Just connect the probe into your coax lineand hook up your test equipment.Because of its low loss. you can leanIt in while you operate!

S"T ilL-I Ii.'H.... I)I · .'1~T LOA.U. IIMMIII' I' rl'I AI 1·22"~lIb,Scul<<I,;1..I.I<" .'s' " .

onl}' 817.93....T t 'L-1 14 UU. t ·Lnt·li.. Ioluo, " 1.':110"", ...,, 1, ~I,,,,,h "0<1 <10,. 81... . . 1 I'" , h " f ",,'"11o;8"lI f "I r", """ .10;..... I 1U\ ' .\ f·

nnl}"822.95""I;T H-I " .\I.I·:\" r..,"".........<I. loes ""nwnul}"85.00t ·..11 (1 1 111 11 7 ... ,.,.7 10 0 ...... .. c u. II •• \ '1"1; .\ .0" ~.,I . .. t ·"- rot"'.

Model 594• 2 Pol. 2 Pos ition• Cro",.11f 45db

(measu red 81 30MHz)

Model 593• Slngl. Pol. 3

POSit ion withgrounding et allunused poSItions

• Crosst.lk (measured at 30 MHz) llii -45db between ad jacent oullels and 60 db between alternate outlets

Now! A dummy load that's just theright size for tow power work . Ratedat30 watts for 30 seconds, the Lytlloa(j«l is perfect for Qrp work.a-mete rs or any application wherelow power and small size are required . The lytl-load1l has a rangeto 150 Mhz with SWR of 1.4:1 at 150Mhz and 1.1 :1 at 30 Mhz.

30 WATT DUMMY LOADFOR QRP AND 2·METERS

All Eagle products carry a 10 day.money back (minus shIpping) guar·entee. Please add $1 per order for ship·ping.

OR DER TODAY FADM

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Portage. MI 49081

LOCATED AT 4475 W. MILHAM ROAD

Specifications lor both switches

• Po""., 1 KW·2 KW PEP• ImpedeneB 50-75 ohms• VSWR 1.2:1 up to 150 MHz• Dlm.nl/ons 1:t.. " high . S" Wide, 3" deep• Weigh! 1 lb.• Mount Wall or de sk

.... 823 Available at your B&W dea ler

Gti~- --=-' 8811<er & WIll,amson. Ioc .

: 10 c..... 51. Broslol . Pi! 19007T~: i21S) 788·$581

T .. n .... e ...

",·..ot 8 ,' h"" k " . n",n,·~' " ...I..._ "r ".... r"'" ~l .f". " .\"1 " .\ .\ ,1<1 11;' sh'l'l'lnol ,,0,1 h.""III"oI ( '"H f ,,·sl.. k ,,, s . ,,".. ....ks I"~,

1; ... ..... I .. e l .\ 11 SST 1...." 1,,,,"' "". ",,,'''''1111''0'"I h ' oI"" ""l t ~"d 1'", I ~"·u, . I" ,,, 10 11110>,,. 110 \"\' """h,' " .,,, ,,,,.,, "'1 11"" III '\Ul '~ I;,. u 1',,11 " ' 1'0", ,1 Iks"shll ' I'I"~'lf ~'"'' u,~ n,,' s"ll,fl"d f", am' " ·n ...." ,

ELECTRONICS ~'"w c BOX 1 L AWNDALE . C A LI F90260 · f213J 376-5887

114

~c. V" Reader Service-8N page ' llti 115

W2NSD/iNEVER SAY DIEeditorial by Wayne G reen

Much of the crowd wandered off to visit the tab les of ham gearbrought in by dealers such as Tufts Electronic s, a carpetbaggerfrom Massachusetts- a state known to most New Hampshire oeopie for the tons of beer cans brought up by thousands of worldfamous Massachusetts drivers and dumped alongside New Hampshire roads on weekends. Here is aging, paunchy Wayne in thecenter, lis tening to John Seeney of Cushcraft tell why his newmagnetic-mount two meter antenna is selling so well. John had adisplay set up in one corner of the Tufts booth and kept a lot ofhams enthralled with his hyperbole.

An excited mass of bidders, vying for every piece of gear, no mat·ter how useless, is here letting its enthusiasm run away with Itselfover a particularly exotic rig.

haven't seen so many GonsetCommunicators all in oneplace in years . .. I wonde rwhat the new owners do withthem?

Manchester is only 35 milesfrom Peterborough, but then,New Hampshire is a very sma llstate and most towns are notvery far apart. Sherry and Ioften drive up to Manchesterfor a busi ness lunch or dinner.The shoppi ng is good there,100, particularly since there isno sales tax in New Hampshi re.After visiting other sta tes, itfeels funny to buy th ings andpay on ly the price marked.

There is a part icu larly good

initials of that club) mountedtheir second annual auction inManchester just before Lincoin's birthday . Chancy lime ofyear for something like th is, asthey found out last year whenMothsr Nature dumped abunch of snow on New Englandthe day before the auction, effectively keeping most everyone home.

The crowd was excellen t thisyear, and the Roving Camerawas there to catch all t he action . The auction brought outtons of vintage ham gear for ayearly change of ownership. I

from page 4

The auction is held in an armory in downtown Manchester, acavernous piace.

Jeff DeTray, the assistant edi tor and publisher of 73 and KilobaudMICROCOMPUT1NG, managed to contain himself through someof the more frantic bidding, returning with naught but pleasantmemories of underbidding on equipment for which he wou ld haveno earthly use.

Here's Chuck Martin WA 1KPS trying to beat off the fran tic buyersof ham gear. Actually, I'm no t kidding about the auction doing wellfor some of the commercial exhib its. Tufts did their best day of theentire month in sales as a result ot me sales made this day . . . lotsof 520s found happy homes. Chuck, who would much rather be skiing, gave In to commercial pressures and brought a truckload ofstuff to New Hampshire, thus ensurin g more healthy signals fromthis relatively rare state.

116

• • • • •615 868-4956

for theBest615 Sou th Galla tin Road, Madison, Tenne u e e 3 7115 .... A40

r- best prices. best service.best t rades e-,

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JANUARY WINNERJohn Murray W1 BNN was the

overwhelm ing winner in ourJanuary Most Popular Articlecontest. He wi ll be receiving a$100 bonus check for his article, "50S! Ship in Trouble! "

line of Instant Software program packages.

ger of things to come as far asthe publishing of programs inbulk is concerned . These areavailable from many of thecomputer stores, a few RadioShack stores, and from InstantSoftware, Inc. A few ham sto resare starting to set up computerprog ram sales centers. Tuft sElectronics is carrying the fu ll

A computer store from Boston had a display at the auction, attrac t·ing computeris t Hal Chamberlin . . . one of the earliest publishersin the field. Hal put out The Computer Hobbyist from NorthCarolina before wising up and moving to New Hampshire. Hiswork with cassette systems lives on in many of the commercialsystems today. Hal, by the way, was one of the first people I contacted when I thought up the idea for starting Byte magazine. Hedidn't seem to think that a magazine would do well for microcomputers, so I next tried Hal Singer, another editor of an excellen thobbyist newsletter. He didn't think much of the idea either, so Itried Bob Albrecht, etc., finally getting down to the chap I eventually picked, Helmers. I understand that Helmers has been sort of"retired" by Byte, so perhaps those who turned down the job madea better decision for the long run.

On tne left is Lynn Panciera-Fraser, the production manager forboth 73 and MICROCOMPUTING magazines. She's working withSherry Smythe, our Executive Vice President In making someChines.e st~amed dumplings. I was not too' busy making myspareribs With black bean sauce on soft Chinese noodles to snapthis picture.

t ion s quickly and easily calculations such as Oh m'slaw, frequency vs. react ance,series capac it ances, parallelresistances, volt age dividers,etc. There are also programswhich give you th e dimensionsfor dipole and yagi antennas.

One of the more useful aspects of computerized calculations is the ability of t he TRS-SOto draw the schematics of theci rcuits and antennas, completewith the dimensions .

With approximately 30% oft he computer hobbyists alsobeing radio amateurs, the salesof the Ham Package I programswere not expected to be low,but sales reports from InstantSoftware marketing show thatthis package of prog rams hasconsistently been one of t hevery best sellers. Only theSpace Trek 11 and the Air Fl ightSimulator program packageshave consistent ly been outsell ing the Ham Package ! SpaceTrek II has been running about40% ahead of the Ham Package, and Air Fl ight Simulatorhas been running about 15%ahead.

At $7.95 for the eight programs, the Ham Package has tobe one of the belter prog ramvalues-and perhaps a harbin-

mu ltimeter art icle authored byWA4AIH in the April , 1978, issueof 73. I need the source for theGeneral Inst ruments AY-3-3550IC and the Intersil ICl 8052ACPD.

Ed McKenzie WA3PHlMillersville State College

Millersville PA 17551

Th is is Steve Murray K1KEC,who apparently lost his razorand scissors a few years ago.Steve is another skier, thoughhe missed the yearly pilgrim·age to Aspen this January.Steve has been deeply involvedwith repeater frequency coordination for abou t ten years .

need help with the digital

SOFTWARE SURPRISEOne of the more pleasant su r

prises in the new softwarepubllsblnq business has beenthe sales of Instant Software'sHam Package I. This is a groupof eight different programs forthe Radio Shack TAS-SO microcomputer. These programs permit you to make most of th e ordinary ham slide rule calcula-

I need a schematic andlormanual for a Sideband Engineers model SBE33. I will payfor photocopying and shipping.

Jeff Taylor WINlUR #1, Box 40A

51. James MO 65559

Ham Help

supermarket in Manchester,loo-Ferretli's-so I stoppedby and found they had somefresh Chinese noodles! Now,how often do you see those in asupermarket? A few days later Igot busy and made up a batchof spareribs with black beansauce on soft noodles. This is adish which I always get when Ivis it Hong Fat restaurant inChinatown in New York (63Motl Street). II's so good, youcan become addicted to it .Imagine my surprise when Ifound that I could make it evenbelterthan Hong Fat! It's easy,on ce you figure out how to doit.

Not to tu rn 73 into acookbook, but there are a fewdishes which I've learned tomake which are fi rst rate , if youare adventurous in you r eating .Qh, you're not? Okay . .. forgetit.

Over visi ting, to ok ing f ormicrowave gear bargains, wasJudson Snyder K2CBA, whomI've known for over 30 years. Asa matter of fac t, he used tobootleg with my ham rig beforehe got his own call. Jud is a biggun on UHF from the Troy areaof New York.

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Social EventsListings in this column are

provided free of charge on asp ace-available ba s is . Thefollowing information should beincluded in every announcement: sponsor, even t, date,time, place, city, state, admission charge (if any), features,ta lk-in frequencies , and thename of whom to contact forfurther information. Announcements must be received twomonths prior to the month inwh ich the event takes p lace.

SHREVEPORT LAMAY 4·5

Th e Shreveport Amat eurRadio Associat ion will hold itsannual hamtest on May 4-5,1979, at the Louisiana StateFairgrounds. Pre-rectstreucn is$3.00; $4.00 at th e door. This isan ARRl sanctioned hamfest.

NEENAH WIMAYS

The J.F Amateur Radio Clubwill hold us annual swaplest onSaturday. May 5, 1979, from8:00 am 10 3:00 pm , at theNeenah Labor Temple, 157 S.Green Bay Road , Neenah,Wisconsin , j ust off Highway 41at the Highway 114 or 150 exit.Facilities include a large parking area and a large indoorswap area with a free auct ion atthe end of the day. Food andbeverage will be available. Advance admission for tl cketsand tables is $1.50; $2.00 at t hedoor. Talk-ln o n 52/52. Fo rreservat ions, wri te to MarkMiche l W90P, 339 Naym utStreet, Menasha WI 54952.

BINGHAMTON NYMAYS

The Southern Tier NYAmateur Radio Clubs wil l holdtheir 20th annual hamfest anddinner on May 5, 1979, at theLutheran Fel lowship aecreetion Center, 3.7 miles north ofNY Rte . 17, Exit 71 N., on StellaIreland Road , Bi ng ha mton ,New York. There will be technical talks, pri zes, d isplays, exhibits, refreshments, and freeIlea-market parking. Ti cket sare $2.00 for general admissionand $7.00 for the banquet (inc luding general admission). Inside tables are $5.00 each, byreservation only. For ticketsand information, write toSTARC, PO Box 11, Endicott NY13760.

DULUTH MNMAYS

The Arrowhead Radio Amateur Club will hold its annualswaptest on May 5, 1979, from11:00 am to 3:00 pm at the FirstUni ted Methodist Church, 230 E.

Skyline Parkway, Duluth, Min·nesota. Admission is $1 .50 andtables are $1 .50. Refreshmentsare available on the grounds. Anauction will be held at 2:00 pm.Talk-in on .34/.94. For moreinformation, write Haro ld Simme rma n N9AMA, Swap fes tChairman, Route 1, Box 7, lakeNebagamon WI 54849, or call(715)-374-3231.

DEKALB ILMAY 6

The Kishwaukee Radio Cluband the DeKalb County Amateur Repeater Club will holdtheir 21st annual mooonoutdoor hamfest on Sunday, May 6,1979, from 8:00am to 3:00 pm atthe Notre Dame School, 3 milessouth of DeKalb between Highway 23 and South tst SI. onGu rler Rd., DeKalb, Illinois.Tickets are $1.50 in advance;$2.00 at the door. Indoor tablesare ava ilable or you ma y bringyour own. The ou tdoor setup Isfree. Talk-in on 146.13/.73 and94. For tickets and directions ,send an SASE to Howard Newquist WA9TXW, PO Box 349,Sycamore IL 60178.

LOGANSPORT INMAY 6

The Cass County AmateurRadio Club will hold its secondannual hamfest on Sunday,May 6, 1979, from 7:00 am to4:00 pm at the 4-H fa irgrou nds,Logan sport, Indiana. Go northof Logansport on Highway 25,tu rn righ t at Road 100, andfol low the aSY signs. Admission is $1 .50 in advance and$2.00 at the gate. Outside setup is free and undercover setup is $1 .00. Bring your owntables . There will be overnightcamping, refreshments, ladies'bingo, and door prizes. Talk-inon 146.52 and Logansport repeater 147.781.18. For information , write Dave Rot hermelK9DV L, RF D 4, Box 146G,Logansport IN 46947.

WA RMINSTER PAMAY 6

Th e Warmin s ter A mat eurRadio Club will ho ld its filth annual " Ham-Mart " f lea marketand auction on Sunday, May 6,1979, from 9:00 am un til 4:00pm, at the William Tennent Intermediate High School , StreetRoad (Route 132), two mileseast of York Road (Route 263),Warminster, Bucks County ,Pennsylvania. A registrationfee of $1 .00 per car includesone ticket for door prizes.Tai lgating is $2.00 additional .Indoor tables are available for$3.00 each. Talk-In on 146.1 6/76and 146.52. Fo r further lntorma-

tton . please w rite Ho rac eCarter K3KT , 38 Hickory Lane,Doylestown PA 18901, or phone(215)-345-6816.

SACRAM ENTO CAMAY6

The North Hills Radio Club,Inc., of the greater Sacramentoarea, is having their 7th annualHam Swap on Sunday, May 6,1979, from 9:00am unt il 3:00 ernat the Machin ists Hal l, 3081Sunr ise Blvd ., Rancho Cordova,Ca liforn ia. Take Hwy. 50 toSunrise, turn left , and go to thesigns. For information, writeCeci li a Pringle WB6PBS, Publ ic ity Chai rman, North H i ll sRadio Club, PO Box 701 , FairOaks CA 95628.

ELLiCOn CITY MDMAY6

The Po t o mac Area VHFSociety will hold its eighth annual hamfest on Sunday, May 6,1979, from 8:00 am to 5:00 pm att he Ho w a rd County Fa ir g rou nds, approximately 15miles west of Balt imore, at theintersection o f 1-70 and Rte. 32,El licott Ci ty, Maryland. A registration fee o f $3.00 inc ludesflea market or tailgate sales .Professional food and beveragecatering and un limited parkingwill be available. Talk-in on .52.For further information, contactPaul H. Rose WA3NZl, 25116Oak o-, Damascus MD 20750.

IRVINGTON NJMAY6

The Irvington Radio AmateurClub will ho ld its annual hamfest on May 6, 1979, from 9:00am to 4:00 pm at the PALBuild ing, 285 Union Ave., Irvington , New Jersey. Take theGarden State Parkway to Exi t143 north or 143A south. Therewill be refreshments andprizes. Tables are $3.00. Talk-inon .341.94 and .52. For informat ion, contact Ed surmarttsWA2MYZ at (201)-687·3240 evenings, or write to IrvingtonRadio Amateur Club, 285 UnionAve. , Irvington NJ 07111.

FRESNO CAMAY 11-13

The 37th annual Fres noHamfest wi ll be held on May11-1 3, 1979, at the Sheraton Inn,Cl inton and Highway 99, Pres.no, California. The program includes technical tal ks , swaptables and fl ea market, transmitter hunt on 2 meters (146.52),QLF contest , ARAL CD appointees meeling, ARRl·FCCforum , commercial exhibits,prizes, eyeball QSOs, prime ribbanquet, and more. For fullregistration and eligibility forpre-registration prize, send in$17before ApriI27,1979;it's$19and no pre-reg istration prizeafter that date. Talk-in on 146.34/146.94. For more information,contac t the Fresno Amateur

Rad io Club, rnc., PO Box 783,Dept. HF, Fresno CA 93712.

DEERFIELD NHMAY 12

The Hosstraders Net will holdits 6th annual tailgate swapfeston saturday, May 12, 1979, atthe Deerfield Fa irgrou nds, Deerfield, New Hampshire. Therewill be covered bu ilding s, incase of rain. Admission is $1.00,with no commission or percent age . Commercial dealers arewelcome at the same rate. Excess revenues will benefit theBoston Burns Unit o f t heSnrtners ' Hospita l for Cr ipp ledChildren. Last year we donatedover $1100.00. Talk·in on .52 and146.40-147.00. For more information, send an SASE to JoeDeMaso K1ROG, Star Route,Box 56, Bucksport ME 0441 6, orNorm Blake WAlIVB, PO Box32, Cornish ME 04020, or checkthe Hosstraoers Net on Sundays at 4:00 pm on 3940 kHz.

VANCOUVER WAMAY 12·13

The Fort Vancouver Hamfairwi ll be held on Saturday andSunday, May 12-13, 1979, atClark County Fairgrounds, Vancouver, WaShington. Registrat ion is $4.00 per person, whichinc ludes a drawing ti c ket.Tickets are also ava ilable at thedoor. Activit ies wil l include contests, seminars,commercial andamateur displays, family eventsand a large ham radio f lea market. Many prizes will be awarded, with the grand prize being an Icom IC-701 HF transceiver and power supply. Thefairgro und tactttttes Includetrailer parking and ample carparking. A catered buffet dinneris scheduled for Saturday night ,with musical entertainment inc luded. Price of the dinner t icketis $5.00 for adult s. For reorstranon. co n t ac t Ken Wes tbyW70VX. Registration Chairman,606 Miami Court, Vancouver WA98664.

DAYTONA BEACH FLMAY 12·13

The Daytona Beach AmateurRad io Association, Inc., w il lho ld its first namtest on May12-13, 1979, at the Holiday InnSurfside , Daytona Beach ,Florida. For Mom and the kids,there is the " dri ve-on" oceanbeach, and shopping in theo ceanside p laza . Ad van ceregistrat ion is $3.00 per fami lyand $3.50 at the door. For moredetails, contact Funfest chai rman David RuslerWA4zn, 1725Hope Drive, Ormond Beach FL32074.

SALINE MIMAY 13

The ARROW Repeater Assoc iation will hold it s annualSwap and Shop on Sunday,May 13, 1979, at the Saline,

119

ceiver. Talk-in on 147.855/.255or 146.52. For Information,write Tri-County Radio Association, Box 412, SCotch PlainsNJ 07076. or call Herb Klawunnat (201)-647·3461.

CROWNSVi l l E MDMAY 20

The Maryland MobileersAmateur Radio Club, Inc., willhold its annual hamfest on May20, 1979, at Camp Barrett ,Crownsville, Maryland, justwest of Annapolis. The gateswill open at 10:30 am. Ticketsare $3.00. Prizes will be awarded. Talk -In on 146.52 and146.10/.70. For information, contact MMARC, Inc., PO Box 784,severna Park MD 21146.

ROCHESTER NYMAY 25-27

The 46th annual RochesterHamfest and the New YorkState ARRl Convention will beheld on May 25-27,1979, at theMonroe County Fairgrounds,Route 15A, Rochester, NewYork. Advance registration is$3.75; registration at the gate is$4.00. The Saturday evening annual awards banquet tickets are$9.50 each. Unlimited outdoorflea market space is available at$1 .00 per parking space. It willopen at noon on Friday and operate until closing on Sunday.The indoor flea market space is$5.00 per table per day and isopen saturday and Sunday only. A limited number of camperhookups are available free on afirst-come, urst-serveo basis.Commercial exhibits and mostprogramming is located at theDome Center and will open at8:30 am Saturday. FCC tests forTechnician and higher classeswlll also begin at 8:30 am onSaturday at the fairgrounds.The ladies' shopping tour andprogram are free, but all musthave a registration ticket. ctrnoren under 12 are also admittedfree. For information, writeRochester Hamfest , PO Box1388, Rochester NY 14603, orphone (716}-424.1100. For tickets, write Rochester Hamtest-Tickets, 737 Latta Ad., Beenester NY 14612.

PORTLAND MEMAY 26

The Portland Amateur wtreless Association and the unfversity of Southern Maine RadioClub will hold a tailgate fleamarket on May 26, 1979, from9:00 am to 5:00 pm on the campus of the University of South·ern Maine, Portland, Maine. Admission Is one dollar. Food willbe available. Talk-in on 146.73and 146.52. For further details,contact John Taylor N1SD, 44Mitton St., Portland ME 04102,or phone (207)-n3-2651.

HAMBURG PAMAY 27

The Reading Radio Club will

STIRLING NJMAY 20

The 'rrt-ccunty Radio Association will hold its annual Indoor namtest/uea market onMay 20, 1979, at the PassaicTownship Youth Center, veneyRoad , Stirling, New Jersey,from 10:00 am to 5:00 pm. Ad·mission is $2.00 and tables are$5.00. Among the many doorpr izes will be a Tempo Sl and atu tty-ayntheslzed 2 meter trans-

EVANSVillE INMAY 20

The Tr i·State Amateur RadioSoc iety will hold its annualhamfest on May 20, 1979, at theYanderbugh 4·H Rural Center,Evansvill e, Ind iana. Grounds forthe hamfest will be open at 8:00am CST Sunday morning. Therewill be no admission charge.Tickets wut be on sale for doorprizes, which are a Kenwood520S and a Yaesu 227R. In eodition, there will be many otherlesser prizes awarded for hamfest attendance. exhibit tablesinside the hall will be $2.50each, and a a-by-a-teet space Ina covered area adjacent to thenemtest will be available for$1.00 per space. Food andbeverage will be avai lable.Satu rday overnight campingspace Is available for those soequipped. Talk-In on .75/.15through the Evansville repeater.

TRENTON TNMAY 20

The Humboldt ARC will holdits annual hamfest on Sunday,May 20, 1979. at Shady AcresCity Park , Trenton, Tennessee.There will be a flea markel ,prizes, ladies' activities, andfood. For further information,contact Ed Holmes W41GW,501 N. 18th Ave., Humboldt TN38343.

Spahl K1SYI at (617)-943·4420after 8:00 pm.

EASTON MDMAY 20

The fifth annual EastonAmateur Radio Society Hamfest will be held on May 20,1979, from 10:00 am to 4:00 pm,at the Easton Senior HighSchool catetonum on Rt. 50,just south of Easton at milemarker 66. From the Baltimoreor DC areas, go across theChesapeake Bay bridge; themile marker is about 27 milesfrom the bridge. There will benerntest signs on RI. SO, northand south. Refreshments wi1lbe available. There will be adonation of $2.00 with an additional $2.00 for tables or tangaters. Talk·in on 52 and 146.445/147.045. For more information,write Charles C. WalgrenWA3ZWX, Box 7, Trappe MD21673, or the Easton AmateurRadio Society, Inc., Box 781 ,Easton MD 21601.

19-20, 1979, at the Birmingham·Jefferson Civic Center Exhibition Hall , Interstate 20159 at22nd Street north (downtownBirmingham, 3 minutes from theairport). There will be en-ccootticned exhibit space and an indoor ai r-conditioned flea market. Ten t a ti ve f or ums areplanned on a wide range oftopics, from ARRL to microprocessors. Meet ings will include MARS, ARRL, Alabamasection netsJARPSC, and others. On-site FCC exams wil l bead m in istered on Satu rdaymorning. Prizes include a DrakeTRlDR·7 send-state transceiver,a Kenwood TS-82O, and a DrakeUY-3 (complete). There will be abanquet on Saturday night atthe Exhibition Hall, with specialguest entertainer Jerry Clower.Fa m il y activities includegames, movies, and bus toursof area sightS. For information,contact Blrminghamfest '79, POBox 603, Bi rmingham Al35201.

DURHAM NeMAY 19.20

The Durham F.M. Associat ionwill hold its annual Durhamfeston Saturday and Sunday, May19-20, 1979, at the South SquareMall, Durham, North Carolina.Plen ty of prizes, exhibits, andprograms will be offered, andthe XYLs can enjoy shopping.Ladies' bingo will be held onSunday. Free tailgating spaces,under a covered, dnve-tn-andsell flea market, come with aone-time $3.00 general reqtetratlon ticket, with vendors anddeal er s inc luded. Elect ri calpower will be available. Harmonics and un li censed XYlsare admitted free. Talk·in on147.825·.225, 145.34·.94, 222.343.94. For more info rmation,wr ite DFMA, Box 8651, Durham~C 27707.

BURLINGTON KYMAY 20

The Kentucky Ham-o-gamewilt be held on May 20, 1979, atthe Boone County Fairgrounds,Burlington, Kentucky, For easyaccess, take the Burlington exitoff 1·75 south. There will be achance for pri zes included withthe $3.00 gate ticket. There willalso be hourly drawings, exhibits, a fl ea market , and refreshments. Talk-In on 146.19/79 and 52152. For more mforrnation, contact NKARC, Box 31,Ft. Mitchell KY 41017.

WEBSTER MAMAY 20

The Eastern ConnecticutAmateur Radio Club will sponsor an electronics flea marketfrom 9:00 am until 6:00 pm, withan auction at 1:00 pm, on May20, 1979, at Point BreezeRestauran t, Webster, Massa·chusetts. It will be held rain orshine. For more informationand fl yers, contact Richard

CADilLAC MIMAY 19

The Wexaukee ARA will holdits 19th annual swap and shopon saturday, May 19, 1979, from9:00 am until 4:00 pm at theNational Guard Armory, 41 5Haynes Street, Cadillac, MichIgan. Tickets are $2.00. Therewill be free parking and lunchesavailable. Talk-in on 146.37/.97.For more information, contactRobe rt Bednar lck W D8RZL,Pub li city Dir ector, WexaukeeARA, Cadi llac MI 49601 .

BENSENVillE IlMAY 19

The Radio Amateur Megacy·ere Society will hold its thirdAntenna Measuring Contest onsaturday, May 19, 1979, startingat 10:00 am on the grounds ofthe Flick-Reedy Corporation,corner of Thorndale and YorkRoads, Bensenville, Illinois.Equipment will be available tomeasure the gain and swr of 2meter, 11/. meter, and 70 cmantennas. Equipment for higherfrequencies will be brought if advance request is made. Prizeswill be awarded for the highest ·gain antenna in each ca tegory.Refreshments will also be sold.For further details, includingdirections, write Joe leKostajWB9GOJ, 2558 N. McVickerAve., Chicago Il 60639. Pleaseenclose an SASE.

BIRMINGHAM AtMAY 19-20

The Birmi ngham AmateurRadio crub, Inc., will ho ld itsBlrminghamfesl '79 and Alabama State Con vention on May

Michigan, fa irgrounds. Admission, including parking on thefairgrounds, is $1.50 in advance and $2.00 at the door.There will be food, prizes, and acovered area for trunk sales, aswell as indoor tables. Becauseof Mother's Day, wives will begiven free admission. Talk-inon 146.37/97, 223.181224.78, and448.5/443.5 MHz. For addit ional details, write ARROW,PO Box 1572, Ann Arbor MI481 06, or ca ll George RaubAD8X at (31 3)-485·3562.

WAUKESHA WIMAY 13

The Milwaukee UHF Society,Inc., will hold its second annualSpring Swapfest on Sunday,May 13, 1979,starting at 7:00amon the grounds of the Waukesha County ExpositionCenter, Waukesha, Wisconsin.There will be prizes and refreshments. Admission is $1.50 in advance and $2.00 at the gate.Some indoor space is available.Deal ers and exhibitors arewelcome. For information, writesweetes t. Box 49, North PrairieWI 53153. Please include anSASE.

120

hold Its annual hamfest on Sunday, May 21, 1919, beginning at9:00 am, at the Hamburg FieldHouse In Hamburg, Pennsylvania. There will be door prizes,food , tailgate sales, and dealerspace available. The hamfestwill be held rain or shine. Talkin on .311.91 and 146.52. Formore informat io n, write TheReading Radio Club, HamfestCommittee, PO Box 124, ReadIng PA 19603.

SALEM VAMAY 21

The Roanoke Valley AmateurRadio Club will hold its annualhamfesl on Sunday, May 27,1979, at the American LegionBuild ing, Apperson Drive, Ylmile west of the intersection ofSouth 11 and 419, Salem, Vir ·glnia. There will be fine prizes,including a first prize of a Ten Tec 540 transceiver. Inside fleamarket tables are $3.00 and tai lgaters are $2.00. Tickets are$2.00 each or 3 for $5.00 In advance. Al l tickets are $2.50 atthe door. Tal k-in on 146.88,146.985, and 146.52. For ad·vance tickets, send an SASE toGeorge Moore WA4GFX, 701Apperson Drive, Salem VA24153.

LOUISVILLE KYJUN 29-JULl

The Louisville Area Computer Club will hold its 4th annualComputerlestTM 1979 fromJune 29 through July I, 1979, atthe Bluegrass ConventionCen ter, Louisville , Kentucky.Activities Include a flea market,semina rs, and exposition, aswel l as act ivit ies for the enti refamily. Seminar and expos it ionadmission Is $4. 00. Pre-reats tered Ra mad a Inn gues ts\$29.00, single; $34.00, double)receive free admission. For advancema il in formation, writeComputer fest ' 79, Lou isvilleArea Computer Club, PO Box70355, Louisville KY 40210, orphone Tom Eubank, Chairman,at (502)-895-1230.

UPPER HUn NZJUN 1-4

The 1979 Annual Confe renceof th e New Zea land Assoctetlon of Radio Transmitters willbe held on June 1-4, 1979, atUpper Hutt , New Zealand.Visitors are welcome to attendth is conference. For registrati on forms, cont act t h eSecretary, 1979 Con fe renceCommittee, PO Box 40-212, Upper Hult Nl.

ST. PAUL MNJUN 2

The North Area Repeater Association, Inc., will hold itsAmateur Fair '79 on Saturday,June 2, 1979, at the MinnesotaState Fairgrounds, St. Paul,Minnesota. Th is is a swapfestand exposition fo r amate ur

radio operators and computerhobbyists. There will be freeovernight parking lor selfcontained campers on June t stonly. You may sell from you rcar in the giant fl ea market orfrom the available insidespace. There will be AMSATand microproc essor exh ibits,FCC, ARRL, Minnesota Repeater Council booths, and manyprizes. Admission is $2.00. Forinfo rmation or reservation s forcommercial space, write Amateur Fair, PO Box 30054, SI.Paul MN 55175.

WENATCHEE WAJUN 2-3

The Apple City Am ate urRadio club will hold its HamFest on June 2-3, 1979, at RockyReach Dam, 7 miles north of thecity on Highway 97, Wenatch·ee , Washington . Reg is tr ation fee lor amateurs is $3.00(which includes one ticket forthe prize drawing), $1 .00 fornon-amateurs, and c hil d renunder 12 are free. A banquetdinner will be held on Saturdaynight at $5.00 per person. Freecamp/trailer space will be provided at the park. Featured w il lbe equipment displays, a VHFtune-up clinic, an art s andcrafts show/sale, a swap shop,a photography display, exhibits, a tour of the PowerHouse, a film on the life ofThomas Edison, and a potluckdinner on Sunday at 1:00 pm.For information and reservat ions, contact the Apple CityAm a t eur Radio Club , 71 3Grandview Avenue, WenatcheeWA 98801.

MANASSAS VAJUN 3

Th e Ole Vi rgi ni a Ham sAmateur Radio Club, Inc., willhold its annual hamfest on June3, 1979, at the Prince WilliamCounty Fairgrounds, located VImile south of Manassas, Virginia, on Rte. 234. Gates will openat 8:00 am but tailgaters mayenter at 7:00 am. General acmtesian is $3.00 per person, withchildren under 12 admitted free.Tailgating is $2.00 per vehicle,with over 300 spaces avai lable.Prizes include a 5-band SSBtransceiver, a synt hesized 2meter transceiver, and a Bird 43wattmeter, plus many more.Breakfast and lunch are available on th e premises. Featuredwill be an FM cli nic, a YL program, a children's program, CWproficiency, and aSL bureauprograms. Indoor exhibit spacefor dealers and manufactu rersis available. For information,write to Sam LebowlchWB4HAV, OVHARC, PO Box1255, Manassas VA 221 10.

WEST HUNTINGTON WVJUN 3

The Tri·State ARA will hold its17th annual t rarntest and family

picnic on June 3, 1979, startingat 10:00 am, at the camdenAmusement Park, West Huntington, West Virgi nia. There willbe a planned program for th eXYL and kids, or you can enjoythe amusement park if you prefer. There is a possibility theFCC will administer amateur exams. There will be major prizes,a large fl ea market, exhibitors,and displays. Dealers are always welcome to space in thecovered pavi lion. Talk-In on34/94 or 16176 . For more information , write TARA, PO Box1295, Huntington WV 25715.

ISLIP LI NYJUN 3

The Lo ng Island Mobile Amateur Radio Clu b, Inc., w il l holdits Long Island Hamfair '79 onJune 3, 1979, from 9:00 am to4:00 pm at the Is li p Speedway,on Islip Avenue (Rte. 111), justone block south of the Southern State Parkway, Exit 43, orsouth on 111 from Exit 56 of t heLong Island Expressway, Isl ip,Long Island, New York. Therewill be over 250 exhibitors.General admissi on Is $1.50 andexhibitors' admi ssion is $3.00per space. Wi ves, sweethearts,and children under 12 are admi tted free. There will be ma nydoor pr izes available for allticket hol d er s . Tal k- in o n146.251.65 and .52. The rain datewill be June 10, 1979. For information, contact Henry WenerWB2ALW, 53 Sherrard St., EastHills NY 11577, or phone (516)829-5880 days or (516)-484-4323nights.

STEVENS POINT WIJUN 3

The Central Wisconsi n RadioAmateurs , ltd., will hold itsswaptest p icn ic on Sunday,June 3, 1979, starti ng at 10:00am at Bukolt Park, StevensPoint, Wi sconsin. There will bea picnic area, refreshments,equi pment sales, and prizes.For information, write to Frankl. Guth W9BCC, s ecretaryTreasurer, Central WisconsinRadio Amateurs, ltd., 1632Ell is Street , Stevens Point WI54481 .

PRINCETON ILJUN 3

The Starved Rock Radio Clubw ill hold its annual hamfest onSunday, June 3, 1979, at theBureau County Fa irgrounds,Pr inceton , il linois. The fairgrounds are centrally locatedand easily reached via routes80-6-34-89-26. Wa tch fo r th elarge yellow " Hamlest" signs.There will be lots of room forthefree sweepers' area and parking. New equipment dealers,manufacturers, and their representat ives are Invited to requestdetails on reserving space inour inside display area. Therewi ll be food and refresh ments

availab le during the day.Camper, van , and tra iler spacesare available for a nominal feeand shou ld be reserved in advance. Please include an SASEfor map, motel information, andadvance reservat ions at $1 .50, ifpostmarked before May 20($2.00 at the gate). For more inf ormation , write W9MKSIWR9AFG, Starved Rock RadioClub, RFD #1, Box 171 , OgleSbyIL 61348, or phone (815)-6674614.

CHELSEA MIJUN 3

The Chelsea Swap 'n Shopwil l be held on Sunday, June 3,1979, at the Chelsea Fairgrounds, Chelsea, Mich igan_Gates will open for sellers at5:00 am and for th e public from8:00 am unti l 3:00 pm . Admission is $1 .50 in advance or $2.00at th e gate. Chi ldren undertwelve and non-ham spousesare admitted free . Talk-In on146.52 and 146.37/.97. Proceed swi ll benefit the Dexter HighSchool Radio Club and theChelsea Communica tionsClub.

ALLENWOOD PAJUN 3

Th e 8t h annua l MiltonAmateur Radio Club Hamlestw ill be held on June 3, 1979,rain or shine, at the AllenwoodFiremen 's Fa irgrounds , located on US Rte. 15, 4 milesnorth of Inters tate BO, Allenwood, Pennsylvan ia. Hours arefrom 8:00 am to 5:00 pm. Registration for sellers is $2.50 advance or $3.00 at the gate. XYLsand children are free. Featuredwi ll be a flea market, an auctio n, a contest , c ash doorprizes , a f ree portable andmobile FM cli nic, and superv ised chi ldren's act tvtt tes .There will be an indoor areaava ilable, p lus f o od andbeverages. Talk-in on .371.97,.341.94, and .52. For furtherdetails, call or wr ite KennethHering WA31JU, RD 111 , Box 381 ,Allenwood PA 17810, or phone(717)-538-9168.

BEMIDJI MNJUN 9

A hamfest will be held onJune 9-10, 1979, at Bemidji Fairgrounds, on the wes t side oftown on Highway 2, Bemidji,Minnesota. There will be a complete program for hams, nonhams, and kids. Camping will beavailable on Saturday night.Tab les are available at nocharge. Tickets are $1 .50. TalkIn on 146.341.94 and 3935. Formore information, wr ite JerryPottratz WBQMSH, Rte. 2, Box239B, Bemidj i MN 56601 .

MEADVillE PAJUN 9

The Crawford Amateur RadioSociety wi ll hold Its f ifth annualhamfest on Saturday, June 9,

'21

1979, at Crawford County Fairgrounds , Meadvil le , Pen nsylvan ia. Admission is $2.00.Gates will open at 8:00 am.Bring your own tables. The costto display is $2.00 for an insidearea and $1.00 lor an outs idearea. There will be door prizes,refreshments, and commerc ialdisplays . Talk-in on .041.64,.8 11. 21, .631.03. For details,write CARS, Hamfest Commit·tee, PO Box 653, Meadville PA16335.

GUELPH ONT CANJUN 9

The Central Ontario AmateurRadio Flea Market will be heldon saturday, June 9,1979, Irom8:00am until 4:00 pm et Centennial Arena, College Ave. W.,Guelph, Ontario, Canada. Commercial displays will open at10:00 am. Admission is 75C perperson with children 12 yearsand under admitted free. Admission for vendors Is an addi·ttcnat $2.00. There wi ll be ala rge indoor and outdoor fleamarket, commerc ial exh ibits,free balloons, free handout s,and operating ham stations.Ta lk - i n o n .52/. 52, .371. 97VE3KSR, and .961.36 VE3ZMG.

SENATOBIA MSJUN 9·10

The lourth annual Trl·StateHamfest will be held on June9-10, 1979, in the col iseum ofNorthwest Junior College,senatobia, MiSSiSSippi. Indoorarr-ccndtttoned space will beavai lable lor manufac tu rers,dealers, and distributors. Forinform at ion, con tact Joel P.Walker, 1979 Hamtest Chai rman, PO Box 276, Hernando MS38632; (601}-368-5277.

AKRON OHJUN 10

The Goodyear Amateur Radio Club will hold its 12th annual hamfest pi cnic and fleamarket on Sunday, June 10,1979, from 10:00 am to 5:00 pmat Goodyear Wing loot LakePark, near Rtes. 224 and 43,east 01 Akron, Ohio. There willbe five main prizes, including aYaesu FT· l01ZD, a Mid land13·510, a Wilson Mark II, aDrake MN·4C, and a Bird wat tmet er. Featured will be a largeIlea market , auction , and picnicarea. Tickets are $3.00 each ortwo for $5.00. Tal k -i n on146.041.64. For more Information, contact D. W . RogersWA6SXJ, 161 South HawkinsAve., Akron OH 44313.

MONROE MlJUN 10

The Monroe County RadioCommunicat ion Associationwill ho ld its annual tremtestSwap and Shop on June 10,1979, Irom 8:00 am to 4:00 pm atthe Monroe County Communi ty

122

College on garsrnvrne Rd. o ffM-SO, Monroe, Michigan. Donation is $1 .00 at the gate. Therewill be plenty of free parking,free trunk sales and indoortable space. Features will include a contest, an auction,commercial displays, and UHF,VHF, and HF technical sessions and demonstrations.Talk·in on 146.131.73 or .52. Forreservations and information,contact Fred Lux WD8ITZ, POBox 982, Monroe MI 481 61 .

OAK RIDGE TNJUN 14·15

The Oak Rid ge Ama te urRadio Club will hold the OakRidge Amateur Radio Convention and Hamfest '79 on July14-15, 1979, at the Oak RidgeCivic Center, Oak Ridge, Tennessee. Admission is $1.00.There will be commercial andflea market exhibitors. FCC exams will be given on Saturday at8:00 am . Features for the ladiesand kids Include movies , a tourof the Museum of Science andEnergy, or the pool, picnic, andplaygrounds at the Civic Center.Camping facilities, motels, andrestaurants are convenientlylocated. The week of July 9-16will be proclaimed AmateurRadio Week in Oak Ridge by theMayor. Talk-in on 146.88, 147.72,and 146.82. Local talk-In on146.52. Anyone interestedshould contact Charles ByrgeWB40BE, PO Box 291 , OakRidge TN 37830.

DUNELLEN NJJUN 16

The Raritan Valley RadioClub will ho ld its eighth annualham fest on Sat urday, June 16,1979, from 8:00 am to 4:30 pm atCo lumbia Park, Dunellen, NewJersey. For details , wri teRaritan Valley Radio Club, RD3, Box 317, Somerset NJ 08873,or phone WB2MNE at (201)35&8435.

MIDLAND MIJUN 16

The Central Michigan Amateur Repeater Association willhold Its fifth annual Swap &Shop on June 16, 1979, at theMid land Coun ty Fairgrounds,Mid land, Mich igan. There willbe computer demonst rat ionsand door prizes. Donation is$2.50 at the door. Talk-in on146.73 WR8ARB and 146.52.For llckets and in formation ,send an SASE to A. L. WertW8001 , 309 E. GordonvilleRoad , R #t12 , Midland MI 48640.

CROWN POINT INJUN 17

The lake County AmateurRad io Club will hold its 16th annual Dad 's Day Hamfest onJune 17, 1979, from 8:00 am until 5:00 pm at the Lake CountyFairgrounds, Crown Point , In-

diana. The event is all indoors.Donation Is $1.50 in advanceand $2.00 at the door. Tab lespace is available on a ttrstcome, first-served basis. Therewill be refreshments, a picn icarea, ample parking, and a zooand playground area for thechildren. Talk-in on 147.84/.24.For information and advancedtickets, write LCARC, PO Box1909, Gary IN 46409.

BARNESVillE PAJUN 17

The Schuylkill Amateur Re·peater Association will hold Its2nd annual namtest on Sunday,June 17, 1979, at LakewoodPark, Barnesville, Pennsylvania,along Rte. 54, 3 miles east ofExit 37E on Interstate 81 . Gatesopen at 9:00 am, rain or shine.Registration is $2.00, with XYland ch ildren free and tai lgaters$1.00 additional. Indoor tablesare available at $2.00 per table .There will be large indoor andoutdoor display areas , prizes,plenty of parking space, amusement rides, pi cnic tables, andrefreshments. Talk-in on 147.781.18 and 146.52. For more Intermatron. write SARA Hamfest,PO Box 901 , Pottsville PA 17901.

TORRINGTON CTJUN 17

The CO Radio Club will holdits first flea market , rain orshine, on June 17, 1979, at theTorrington Fish and Game, Torrington, Connecticut. unoershelter tables, tailgate space,light lunches, a raffle, and a YLbake sale will be featured .Talk·in on 147.84/.24 and 146.52. Fori n f orm ati o n , con t act Bo bWlfH P at (203)·266·7232, EdW 1JSU at (203) -482- 1837 ,Everett K1AOE at (203)·482·0523, or write Dave JohnstoneWB1COB, 19 Margerie sr, Torrington CT 06790, or phone(203)" 8H 348.

BEllEFONTAINE OHJUl1

The Champaign logan Amateur Radio Club, Inc., will holdits annual hamfest on Sunday,July 1, 1979, at the Logan county Fai rgrounds, South MainStree t and l a ke Aven ue,Bellefontaine, Ohio. There willbe free admission and doorprizes. Trunk and table salesare $1.00, and there wil l also bea bid table. Talk-in on 146.52.For more information, contactJohn L. Wentz W8HFK. Box102, West Uberty OH 43357, orFrank Knull W8JS. 402 Letayette Ave., Urbana OH 43078.

DUNKIRK NYJUl1

The Northwestern New YorkRepeater Association and theNorthern Chautauqua AmateurRadio Club will hold their LakeErie Internat ional Hamfest on

Sunday, July 1, 1979, at thefairgrounds in Dunk irk, NewYork. A la rge flea market areaand plenty 01 free parking willbe provided . Tickets are $4.00at the gate or $3.00 in advance.RV hookups are available. Forinformation on advance salesor for a map showing easydirections from 1·90, write toDick Brinkerhoff WB2HEF, 1235th St ., Dunkirk NY 14048.

INDIANAPOLIS INJUt 8

The Indianapoli s AmateurRadio Association will sponsorthe Indianapolis Hamfest onSunday, July 8. 1979, at theMarion County Fairgrounds, onthe southeast corner of Indianapolis at the intersect ion ofInterstates 74 and 465, Indianapolis, Indiana. There will becommercial exhibitors anddealer displays for a fee o f$30.00 per booth. The commercial building will be open from12:00 noon until 9:00 pm onSaturday and will reopen at 7:00am on Sunday. Camper hookupfaciliti es are available on thefairgrounds for overnight parking II you arri ve on Saturday. Alood and drink vendor will havea setup outside, while a prcteselena! caterer will have teenIlles inside. For more information, write to the IndianapolisHamfest , PO Box 1002, Indianapolis IN 46206.

CANTON OHJUl15

The fifth annual Hall of FameHamfest will be held on Sunday,July 15, 1979, at Stark CountyFairgrounds, Canton, Ohio .Tickets are $2.50 in advan ceand $3.00 at the ga te. Mobilecheck-in on .191.79 0r .521.52. Forinformation, contac t MaxLebold WASSHP, 10877 Hazelview Ave., Alliance OH 44601 .

PITISFIElD MAJUt 21-22

The NoBARC Hamfest will beheld on July 21·22, 1979, at Cummington Fairgrounds, Pittsfield,Massachusetts. There will betech talks, demonstrations, anddealers. Flea market admissionIs $1.00. Advance registration is$3.00 si ngle and $5.00 withspouse, and $4.001$6.00 at thegate. Gates open at 5:00 pm onFriday for free campi ng. Talk-inon 146.31/.91. For reservations ,contact Tom Hamilton WA1VPX,206 california Ave., Pittsf ieldMA 01201 .

ESSEX MTJUl 21·22

The International eraererWaterton Hamteat will be heldon July 21-22, 1979, at the ThreeForks Campground, ten mileseast of Essex, Montana, on USHighway 2. Registration is at9:00 am. Tal k-in on .52 and

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Con tinued on page 165

JACKSONVIllE FlAUG 4-5

The Jacksonvill e HarntestAssociation is pleased to announce the 1979 Jacksonvi lleHamfest and ARRL North Flo rida Section Convention to beheld on August 4-5, 1979, at theJacksonville Beach MunicipalAuditorium, Jacksonville, Herida. The locat ion is just oneblock from the beach, whereU.S. 90 meets the sea.

Advanced registrations areavai lab le at $3.00 per personfrom A. J. Cutting W2KGI/4, 30310th St. , At lantic Beach , Florida

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BOWLING GREEN OHJUl29

The Wood County AmateurRadio Club will hold its 15th annual Wood County Hem-e-namaon Ju ly 29, 1979, at the Bowl ingGreen Fairgrounds, BowlingGreen, Ohio. Gates will open at10:00 am, with free admissionand parking . Dealer tables andspace are available. Trunk salespace and food will also beavailable. Tickets are $1 .50 inadvance and $2.00 at the door.Prizes will be awarded. Talk-inon .52 K8TtH. For information,write Wood County ARC, c/oEric Willm an, 14118 BishopRoad, Bowling Green OH 43402.

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C~OMMUNICATIONS"ELECTRONICS" ~c,********************

tton starts at 9:00 am Saturday.Activ ities start at 1:00 pmSaturday and conti nue until2:00 pm Sunday. l adies maybring their hobbies and itemsf o r a white -e lephan t sale .Featured will be prizes , a fleamarket, bunny hunts, entertai nment, a home-brew contest,and more. A potluck lunch willbe served Sunday at noon. CallIn on 3800, .34/.94, and .76simplex . For information, wri teJohn Juul-Andersen VE7DTX,8802 Lakeview Dr., Vernon,B.C., Canada V1B 1W3, or LotaHarvey VE7DKL, 584 Heat herAd., Pent icton, B.C. , CanadaV2A 1W8.

MARSHAll MOJUl22

The Indian Foothil ls AmateurRadio Club will ho ld its 4th annual hamfest on July 22, 1979,at the Saline Co un ty Falrgrounds, Marshall , Missou ri.Tickets are $2.00 each or 3 for$5.00 in advance; $2.50 at thedoor . Regist rat ion is at 8:00 am,with lunch at 11 :30 pm (all youcan eat) and the drawing at 2:30pm. Prizes include a Tempo S1,a Dentron Jr. Monttorr tuner,and many more. There will befl ea markets for the OM andXYl. There is no charge for f leamarket tables this year, butreservat ions are reques ted .There will also be old and newequipment displays, a 10·Xbooth , and other activit ies forthe XY Ls. Talk-in on .52, .28/.88,and 147.84/.24. For informationand ti ckets, write Norman Gibbins WBlllSZI, 692 North Ted,Marshall MO 65340.

EUGENE ORJUl21-22

The 4th annual Lane CountyHam Fair will be held on July21 -22, 1979, at the Oregon Nat ional Guard Armory, 2515 Centennial Blvd., Eugene, Oregon.Registrati on is $3.00, and an extra drawing ticket is given withadvance registration. There willbe disp lays, lectu res, contests,swepshop. transm itter hunt ,and entertainment. The faci lit ies provide plenty of free parking for motor homes and trailers.

For information and advancereservat ions, phone or writ eWanda or Earl Hemenway, 2366Madison, Eugene OR 97405 at(503)·485-5575.

.34/.94. For more information,write aracrer-watertcn Hamfest, PO Box 2225, Mi ssoula MT59806.

MOOSE JAWSASKATCHEWAN CAN

JUl27·29The Moose Jaw Amateur

Radio Club wi ll hold its 1979Hamfest (Part tcltest 79) on Ju ly27·29, 1979, at the Saskatchewan Techn ical Inst itute, 600Saskatc hewan St. W., MooseJaw, Saskatchewan , Canada.Registrati on will be held on Friday evening with a full day ofactivities on Saturday culminati ng in a banquet and dance.Most of the meet ings and workshops wi ll be held on Sunday.The re wil l al so be a busyschedule for the XYLs.

OLIVER BC CANJUl28-29

The Okanagan Internat ionalHamfest wi ll be held on July28-29, 1979, at Gallagher LakeKOA Karnpsite, 8 miles north ofOliver, B.C., Canada. Registra-

V" Rea der Service-see page 195 123

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Remember, you can Call Toll Free: 1·800-633·3410 in the U.S.A. or call 1-800-292-8668 In

Alabama for our low price quote. Store hours: 9:00 AM til 5:30 PM. Monday thru Friday.

••.,....-

RSGB Books0","' ,...' 11_ 5.'....... T~Compreller-.I _ 0" am. "'" ....,"ttlles"'u." .,ed " ,'n prClu'es ."" en.", I N .l0059

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......._ C_ e-... .,03·T f ,om 8 ' 0 18

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TRAINING PACKAGESTAPES

73 co...""N",, 'C. TnltClry Tapes prep. ,,, ,ou 10< '~ FCC,,""'C. ,, ' .... CIO• •" p'_""'d m.,,,,,.' c." l>e'e--I.....ed m.n, 1Imn I N 2630ti 15.15

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MORSE(TX'RX)

TRANSCEIVER

Feature.• ASCII &. BA UDQT• Auto Sync . 1-150 WPM• Microcomputer I nterfa ce

• Partial Kit '95•

• Full Kit '225•• Asse m bled &. Tested *295.

TERMINAL UNIT

MRS·100

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....... KEVER O PTION ALMC / VlSA OROf:R flY PHOSE ....1(3

»XITE:X CORP.I:Ul:!'" ~l'lItrun P. o. uO... ·W:!! IOIl.. 11;1,... "Ii-,; !:- ; r,:! -IO c1l4 1:11"6-;11'\59

SCT·IOO STANDALONE VIDEO BOARD °

• P artia l Kit '95.

• F ull Kit *Ul7•

• Asse mble d &. T e ste d '187.

COMPLETEDYBOARDTERJDNAL'S50. Kit 295

(t.... Mon'torl

.ONlTOR'138.112" BIlW)

NEW MFJ DELUXE 3 KW Versa Tuner N

95

MFJ ENTERPRISES, INC.P. O. BOX 494 ... MS2

MISSISSIPPI STATE, MS 39762CALL TOLL FREE., _, 800-647·1800For technical lnlormation, onlrrlrtpair stltus, InailS., IlrtlldI COi,tit.,ntaI USA, call 6010323-5111.

leaturr for Ira turr with other tuners. Compare itsvalue, its quality and rts pertormance.

Afttf • truly sldr by sldr ClmpanSH, you'llbe convinced that its value, quality and teaturesmake It a truly outstanding value.

Why nol vlsil your dr.lrr today? If no dealeris available call toll -free 800-647·1800 and orderdirect from MFJ. $8.00 shipping.

Insur.s mallimum powe, toantanna at minimum SWR•

EXCLUSIVE RF AMMETER

AI metal, 10. pt01llt cabinet gives RFt protection. rigid Construction. Black. AOOlIlzed alumloumfront panel. 5x14x14 in. 20 pounds.

A Dip stanel lilts tuner lor easy viewing.Efficient, rncapsuLIted trn1tr 4:1 !lakin. 500 pI.

6000 volt capaci tors. 18 position dual inductor,17 amp ceramic rotary switch. 2-/. meters.50-239 coax connectors. Ceramic feedthru torrandom wire. balanced line. Binding post for grouoo.

QUAL[!;, Ev.ry slngl. unll Is testrd tor pertormance and inspected lor quality. Solid Ameri·can coostncuoe. quality components.

The MFJ.9S4 carries • lull one year limitedwarranty.

For your nllrlsl MFJ lIeal.r. call totl-/ree800·647·1800. Stop by your dealer. Compare it

_..•

_.--~." ; ;,1/'- - '- -,. ,.....- -

The MFJ·984 Deluxe 3 KW Versa Tuner IV gives you a combination of features thatonly MFJ offers, like .. • exclusive RF ammeter, dummy load, SWR, forward, reflectedpower meter, antenna switch, balun. Matches everything from 1.8 thru 30 MHz: coax,balanced lines, random wires.

,7 I~§~:'j.(.!!,,~-:, ~V -'v'-"' I::.~n~ .. _

.....~_._ _'011

TIlb Is MFr. Mst 3 KW Yen. fUlllr IV. Thet.f'J.984 lkluxP 3 KW Versa Tuner IV gives youa combmabon of quality. perlormance, and lealures thai others can', touch at Ihis price.

PERFORMANCE: You tift run up 10 3 KW PEPand contjnuousl)' match any leedline from 1.8 to30 MHz: coax, balanced hne or rafldom wire.

FEATURES: A 10 amp RF ammeler insuresmaximum power 10 antenna at minimum SWR.

A UP'l1te meier gives SWA, t!)"Ward. rellectedpower in 2 ranges (2000 and 200 watts).

A fIellble anlenna Iwllch le ts yw select 2coax lines thfu tuner and 1 thru or direct, orrandom wire, balanced line or dummy load.

A 200 Witt 50 ohm dummy loll! 'ets you tuneyour exci ter off air tor peak serromarce.

130

AMATEUR RADIO'S DlGGESTMAGAZINE AT IW.F PlUCEI

v. -l'OUto"'"__ lOClIo· lftCllIUIM ......, .UI 1* CClPJ. 7~ Mogoldne UO 011 tile_.lIOIl-tIoot'. sao1*yeM You _ flgIlI rlIIllg U1l1by.......... .....,.V ...........tNI~.,...OIIt1le-V................. ., tNlldnd to pro.. to l'OU dlot 7~"pul"'".....,.......,...OllJtNng...l'OU-Iluy..........

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Since1963

Sma II Orders WelcomeFree 'Tech_Data' Flyer

Iron Powder and Ferrite

TOROIDAL CORES•

AM leO I\I.:.+.,.... Al B J-\.MVUlUlb

12033 OTSEGO STREET, NORTH HOLLYWOOD, CALIFORNIA 91607In Germany E I ~ ~lron lk laden, W'lhelm - Mellin SIr 88,4930 Delmold 18 West GermanyIn Japan To~omu ra uecuevcs Company, l1d . 7'9, 2·Chome Sota·l(anda. Chlyoda -Ku. To.yo. Japan

Shielding Beads , Shielded Coil FormsFerrite Rods. Pot Cores. Baluns. Etc

DEALERS WANTED-OVER 300 WORLD· WIDE

AUXILIARY POWERfor Emergency or Portable Operation

....012

light wt Portable Alternator Stand·bypower for HamEquipment. household needs during powel outages oroperation In remote areas, Operates lighting.refrigerators, heating systems or other appliances Ineluding Ireq. sensit ive loads such as TV sets, indue·ten motors and fluorescent lights, Solid-Statevoltage regulation. 37501'0' rating : 25% surgecapacity, 1201240V at 3L3/15.6A, 8 HP/3600 RPMB&S engine, Alternator draws Just ellOugh engine output to meet load resulting in up to 25% fuel savings.l ow interference, Advar.ced design Dr ip·proat con.structicn protects windings from rain and dirt esseing long life. One year warranty by manufacture r.30'l x 18"1'0' x 19"H. 128 lbs. Shipped via TruckPREPAID (No extra charges) ... , , , , .. , $659 .95

Electric Stlrt . . . $110.00Banery Charging. . . 11 .00Spark Arrest Muffler . . . . . . . . . .. 21.00

Models avai lable with 1350 10 7000 watt ratings.Write fo r our Quote and additional information,

Mastercharge or VISA accepted

OUTDOOR OUTFITTERS705 Elm Ct. Waukesha, WI 53186Ph. 1·414·542-7772 • Ken, N9KS - Mgt.

-• UlUS ·rllrs ·USULITDRS• QlU HITS ' UHUI urs• IODI/MUT IOUTS -WIU• U.lE -COU(CTQIS

FUll' POWER, qUALITYHAM ANTENNA PARTS

AT YOUR DEALER

WlITE FOI fUll ClTHOG[ h eIn. 3h St..,p. l

1:1014 :12,n••

'"

• Aulo. send & receive: R"Y & CWo• Complete hardware & software.• Connects to lRS·80 User Pol1 & key/headphone jacks.• 10 message memenes . 255 char. ea.• Keyboard buffer-allows Iyping ahead. $99• Usn built·in Pll or uternal TU. • •• Morse Irainer·random sener words. kit• Includes hardware, eassene & manual. $129• Requires lenl" Basic & 16KRAM. •

wired• PET version avai lable , 69 95 klt / 99 95 wired

Wrlle Otcall tor detailed brochure

TRS-SO OWNERSSend-Receive RTTY & CW

• Th O ri llllllll~ l.i . &.", .t. 'Sl lfStn IIU• Shi,ltn Hlr4w, re.$tllt4 ASSISTINCE?"cuunTHD till : Hun GUn ISOH , wn lOT

TIll' Fret 800 · 4 48- 1666Ins Colleet 315' 437-3953 ]

132 ,., Reeder Service - see page 195

95

•

• DC VOLTAGE• DC CURRENT

• AC VOLTAGE• n RESISTANCE

• AF OUTPUT - DB• 20k fl PER VOLT• HFE DC AMP FACTOR

• ICEO LEAKAGE

.....

MODELYF-370

•COMPARATIVE VALUE 49"

YF-370 '29.95Shippi ng, Hand ling and Ins... s3.00

DSI INSTRUMENTS, INC.7924 Ronson Road, Dept. G, San Diego. CA 921 11

Every YF-370 is factory assembled , tested , an dincludes diode protected meter movement witha fused input and an extra fuse. The swi tch assembly has double wip ing gold plated contacts toassure years of trouble-free service. A t this lowprice buy two...one for the car and one for the shop.

CAll TODAY TOLL FREE: (800-854-2049) Calif.- R.a.CALL (800-542-6253) TO ORDER OR RECEIVE MOREINFORMATION ON osr. FULL PRODUCT LINE OFFREQUENCY COUNTERS RANGING FROM 10HZTO 13GHZ

TERMS: Me - VISA - AE - Check - M.D . - COD in U,S Funds.Orden outside of USA & Canada, please add $5.00 addItional 10 coverair shipment California residents add ~ Sales Ta .

SPECIFICATIONS

Me....'_l M...ur_ tR_ gn A C«l'K)'

DCV 0- .1V - .sv - 2.5V- ::!:. 3% tstOV· SOV - 2SOV - l000V

ACV 0- 10V - SOV - 250V - z 4% IslQOOV 30Hz to 30kHz

DCA o - SOj.lA - 2.5ma - zsrna z; 3% Is- .25A

n .2 to 20mfl :! 3% arcRange x t x tux tk x 10k

dB + tore - +22dblor 10VAC + 4% ts

ICEO 0- 150j.lA x 1k 0- 15ma :! 3% arc, 10 0-15Omx 1

lc :! 3% arcHFE 0-1000@x l0-i,

MODEL C1000 10Hz to 1GHz• INCLUDES BATTERY PACK• AUTO ZERO BLANKING$49n95 . AUTO DECIMAL POINT

:;]-- • 10MHz TIME BASE

MODEL C700 50Hz to 700MHz• INCLUDES BATTERY PACK• AUTO ZERO BLANKING$36t\Q5 .AUTO DECIMAL POINT

:;]-- • 10MHz TIME BASE

Accuracy .. . that's the operational key to this rugged advanced design Model ClaDa l GHz frequency counter .. . asigni ficant achievement from OS!. ThaI's because you get. .. .1 PPM 0° to 40°C proport ional oven time base ... Bui ltin 250 8 preamplifier with a 6008 adjustable attenuator ...x1D & xl00 audio scale r which yields .01 Hz resolu tion from10Hz to 10KHz equivalent to 10 sec. & 100 sec.G ate Time ...Selectable .1 & 1 sec. time base and 50 ohms or 1 meg ohminput impedance ... Built-in battery charging circuit with aRapid or Trickle Charge Selecto r ... Color keyed high qualitypush button operation .. . All combined in a rugged blackanodized (.125" thick) aluminum cabinet. The model C-1000reflects OSI's on going dedication to excellence ininstrumentat ion for the professional service technician,engineer, or the communication industry.

ALL NEW! All UNPARALLELED OSI QUALITYI The modelC 700 700 MHz frequency counter features. . . .2 PPM0° to 40° C proportional oven time base .. . 25db preamplifierwith a 60db adjustable attenuator. Built in battery chargerwith a rapid or trickle charge selector . .. Combined in arugged (.125" thick) aluminum cabinet makes the C700ideal for the communication industry and professional service techn ician.

3600A OWNERS: Up date your 3600A frequency counter toa C 700 includes, new back board, .2PPM proportional oven,25db preampli fier, rugged .125" thick aluminum cabinet,order 3600A-700. Unit must be returned to OSI factory formodification.

DSI GUARANTEED SPECIFICATIONS - FACTORY ASSEMBLED - MADE IN USA-Proportional Oven 50Hz 7SMHz SOOMHz Number Size

Frequency Accuracy Over To To To 01 01 PowerModel RllnGe Temperalure 75MHz SOOMHz 1GHz OIalt. Dlall. Reaulremenl. Size

C700 SOHz 10 7QOMHz .2PPM 0° to 40°C 50MV 10MV NA 8 .5 Inch 115 VAC-BATT 3"H x 8"W x 6"08 to 15VDC

C,OOO 10Hz to lGHz .1PPM 0° 10 40°C 20MV 'MV >50MV 9 .5 Inch 115VAC-BATT 4"H)\ 10"W x 7"""08 to 15VOC

- All Units Are Fectory Assembted, Tested And Cerry A Full 5 Yeer LImited Warranty -Model C 700 $369.95

FREE••••• • • •••••••••••••••••••••••• •••• •• •• ••• •

: Strongest warranty in the counter field. :: Sa tisfaction Guaranteed. ••••••••••• ••••••••• ••••• • •••• •••• ••••••••••

FOR MORE INFORMATION

Call Toll Free: (800) 854-2049DSI INSTRUMENTS, INC.

Cali fornia Residents, Call Collect: (714) 565-8402VISA . MC • AMERICAN EXPRESS. CHECK . MONEY ORDER . COD

7914 RONSON ROAD, #G. SAN DIEGO, CA 92111

3600A-700 Factory Update (3600A only)Includes Labor & He-Calibration $199.95

Model C 1000 $499.95

Opt. 011 .3GHz (C1 000 0nly) $ 99.95

Opt. 02 .05 PPM 10MHz Double Oven00 to 50'C Time Base (C10000nly) $129.95

Ant. 21 0 Telescopic Ant./BNC Adapter $11.95

ARE YOU ON FREQUENCY?

MODEL 3600A .5PPM 17° - 37°C

$1 9995 . AUTO ZERO BLANKING• AUTO DECIMAL POINT• INCLUDES ANTENNA

SAVE SHOP COSTS WHEN ADJUSTING XTALSMEET YOUR QSO ON FREQUENCY EVERY TIME

The 3600A and 3550W Frequency Counters represent asignificant new advancement, utilizing the latest LSI Design... which reflects DSl's ongoing dedication to excellencein instrumentation, for the professional service technicianand amateur radio operator. Befo re you buy a o sr instrument you know what the specifications are. We publishcomplete and meaningful specifications wh ich state accuracy over temperature and sensitivity at frequencies youneed. And we guarantee those specifications in writing .

MODEL 3550W TCXO

$14995• INCLUDES INTERNAL BATTERY HOLDER• SAME AS 3600A LESS OVEN• SEE SPECIFICATIONS BELOW

MODEL 3700 .2PPM 0° - 40°C

$26995 . AUTO ZERO BLANKING• AUTO DECIMAL POINT• INCLUDES ANTENNA

PORTABLEI TAKE IT TO THE MOUNTAINS ORUSE IT MOBILE - TAKE IT WITH YOU ON FIELD DAY

ALL NEW! ALL UNPARALLELED OSI QUALITYl The model3700 700MHz frequency counter features ...•2 PPM 00 to400C proportional oven time base ... Bui lt in battery tricklecharger less batter ies ... Combined in a rugged (. 125" thick)aluminum cabinet makes the 3700 ideal for the communications industry , pro fessional service techn icians, andsophisticated amateur radio operators.

3600A OWNERS: Update your 3600A frequency counter toa 3700 includes . ...2 PPM proportional oven, rugged .125"thick aluminum cabinet, order 3600-A - 3700. Unit must beretu rned to OSI factory for modi fication.

051 - GUARANTEED SPECIFICATIONS - MADE IN USAAccuracy Number Slle--, F,equHlcy Ove' @ @ @ " " Powe' Sin

Range T.m~etur. 146MHz 220MHz 450MH z Reedoul. Readout. ReqUirement.

3700 SOHz - 700MHz Proportional Oven 10MV 10MV SOMV 6 .S Inch 11SVACor 3"H x 8"W x 6"0.2 PPM Oc _ 40°C 8.2 - 14.SVOC

3600A 50Hz - 600MHz Oven 10MV 10MV SOMV 6 .S Inch 11SVAC or 2',,"'H x S"W x S"O.S PPM 17° _ 37°C S.2 - 14.SVOC

3SS0W 50Hz - S50MHz 1 PPM 65° _ 8soF 25MV 2SMV 75MV 6 .S men 115VAC or 2W'H x S"'W x S"O8.2 - 14.SVOC

99.953600A - 3700 Factory Update (3600A Only)

Includes Labor & Re-Cafibrati cn $Strongest warranty in the counter field. :Satisfaction Guaranteed.

- ALL UNITS ARE FACTORY ASSEMBLED, TESTED AND CARRY A FULL 1 YEAR WARRANTY -• NO EXTRA COSTS •

FREE Sn! here t USA de d Model 3700 . . . . . . . . . • . . . • . . . . . . . • . . . • . . . • . $269.95Ippmg anyw ere m .. ,an ana a.All other countries. add 10%.· .

•· .See Your Dealer or

Call Toll Free: (800) 854-2049DSI INSTRUMENTS, INC.

California Residents, Call Collect: (714) 565·8402VISA. MC • AMERICAN EXPRESS · CHECK . MONEY ORDER . COD

7914 RONSON ROAD, #G, SAN DIEGO, CA 92111

Model 3600A $199.95

Mod el 3550W $149.95

Option 03 20-Hr. Rech argeableBattery Pack $ 29.95

1000

. S8U5

.1 ss... NC _

...... NC V/S4........... NC •

(800 854-2049)

".. G20

DDVETRDN

,ARC~ TRANSM ITTER -w,tt! au tuDes and

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137

Improving the Sabtronics 2000- make a good DMM even better

Easier maintenance is a bonus.

Photo 1. Th is is the display board o f the Model 2000 DMM, showing the added transistorsthat drive the decimal poin ts.

138

James D. r o-ett tt N8AM R146400 J Terrace ViewBlocksburg VA 24060

Shortl y after the ad forth e Sa btroni cs Model

2000 digital multimeter appeared in 73 Magaz ine, Isent in my check for one. Isus pect tha t qui te a largenumber of othe r people

did the same, s ince myorder was delayed severalweeks. When the DMM finally a rrive d, I assembledthe kit and, to my surpri se,it worked the first time Iturned it on. After calibrati on , usin g the supp l iedresisto rs as references, themeter's performance compared quite favorab ly tothat of a more expensiveDMM.

I was pleas ed with themeter for its performance,and pleased with myself

for taki ng advantage of agood dea l, until I noticedthe meter would not zeroon the ac sca les. With theinput leads sho rted, thedisplay would eventuallysett le down at about 0.5vo lts on the tun-volt sca le.A quick c heck showed thata ll of t he ac voltage andcurrent sca le s were affected .

At first I assumed that Ihad made some mistake incons truct io n, but checkingwith two other owners of

the Mode l 2000, I foundthat they noticed the sameprob lem.

Fortunately, the des igne rror is easy to cor rect. Iwi ll describe the necessarymod ification, plus a reloca tio n of t he fuse ho lderand insta llation of nicadbatteries and a cha rger fo rconvenience.

After I st ud ied the boardlayout and schemat ic fo rthe DMM, I tried a fewthings that looked as ifthey mig ht correct thetrouble. I found that if Iunhooked the +6 vo ltsthat powered the decima lpoi nts, the meter wouldzero properly . Appa re ntly,the high level de li ne thatfeeds t he dec imal points islo ca ted too nea r the lowleve l ac lines on the ma inPC board. You can seethere is q u ite a mess oft races ca rrying the varioussigna ls to the range andfunc tion switc hes if youcheck the layo ut diag ramsin the manual.

Befo re I desc ribe themodifications I made tothe ci rcuitry, I wa nt to saythat I have had no co ntac twit h Sabt ro nics on thismatter. I hope they corrected the prob lem in la termodel runs, but I do notknow. Obviously, you cancheck to see if you r mete rhas t he problem by sim ply

DISIILU C' ''CUIT IO.All

Fig. 1{a). B/ock diagram of decimal point driver circuit ry ofthe Model 2000 DMM before modifica rion. ca refu l. Pre pare the three

d river t ra nsistors by bending the base lead of eachone back ove r the case sothat it is pa ralle l to theother leads but pointi ng int he opposite di rection .Solder one of the resistorsto each base lead . I usedj Ok-Ohm re sisto rs with thejunk box transistors I had,but you may need to usesmaller values (o n theorde r of 2k) with so me transistors.

Working on the back(side of the boa rd withtraces) o f t he disp layboard , solde r t he collectorlead of one of t he prepa redt ra nsisto rs in the hol emarked DP1 where yo u re-

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Photo 2. This pictu res the rea r of the DMM, showing theadded fuse holder on the right and the charging jack andcomponents on the feft.

as to the diagrams a ndphotographs I have supp lied .

Pho to 1 shows how thetrans isto rs a re mounted onthe d ispl ay board . First, unsolder the e nd of R49 that isnea rest the edge of the mainPC board . Bend this resistorst raig ht up so that itis perpendicular to theboard . Solder a s h o rtlength of hookup wire fromthe hole where you justremoved R49 to the groundlug on t he input te rm ina lsof the front panel. Nowre move the three wires o nthe dis play board ma rkedD P1 , DP2, a nd DP3. Youcan d o th is without rernoving th e board if you a re

Fig. 2. Schematic of decimal point driver circuitry. R49 ispart of the original DMM circuit. The transistors are addedto the back of the display PC board. Rt , R2, R3: 2.2·lOkQ(see text), !4 to 'Vz Wa tt. Ot. Q2, Q3: any silicon PNPgeneral purpose transistor, such as Radio Shack 276-1604.

139

modify a ny of the traces o nthe PC boa rds.

Fig. 2 shows the ac tua lschematic of t he added circ uitry . The transistors d rivethe dec imal po in ts; theswitching a rrangement o nthe DMM main PC board isnow near ground potentialand ca rries only the smallbase current needed todrive the t ra ns istor s .Alt hough a small PC boa rdwould ha ve a llowed a nea tinstallation, I did not th inkit was necessary for so fe wp ar t s. In t he follow ingste ps, refer to the d iagramsof the PC bo ards in yourSabt ronics manual as well

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shorting the input leadsand punc h ing u p t he10.().volt ac range.

If you ref er to Fig. 1(a)and compare the simplified diagram with theschemat ic in your manua l,you will see that the rangeand function switchesdrive the decimal pointsdirectly off the + e.n-voltline through R49 (150Ohms). Fig. Hbl shows ablock d iagram of the circ u it afte r mod ifica tio n.The mod ification requ iresonly th ree garden-vanetvPN P tran sistors and threeYz- or ~-Watt resi stors.You do no t have to cut o r

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Fig. 1(b). Block diagram o f the decimal point driver circuitry of the Model 2000 DMM after modification.

Fig. 3. Charging c ircuit for nicad ba tteries ins talled in theMode' 2000 DMM. Adjust R4 for l ao-rnA chargingcurrenr.

moved the wire previ ously.Install the other two t-ansiste rs in the hole s markedDP2 and DP3. Solder t hee mitte r leads of all th reetransistors together and attach a wire from the emitter leads to the free end ofR49 on the main PC board.Fina lly, so lder the freee nds of the wi res youremoved from the disp layboa rd to the correspondi ngresistor on the driver transistors you insta lled . Thiscompletes the decimalpoint modif ication and themeter should ze ro properlyon all the ac scales after afew seco nds. After you aresu re everything is working

properl y, you may want toinsulate the tr an sistorswith some si lico ne rubbe ro r tape .

The second modificat ion to the Model 2000 wassim ply the moving of thefu se ho lder. I manage toblow the fuse in my DMMabout once a month bypu nc hi ng the cu rrent button with the leads conne cted to a battery. Sincethe fuse is mou nted insidet he Sabtronics meter ,changing it requires thatthe case be disassembled.Unfortunately, I cou ld nottrain myself not to blowthe fuse, so I did the nextbest thing - I mounted a

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pa ne l-type fuse ho lder o nthe right rear of the meter(Photo 2). I c ho se a Rad ioShack (27D-365 ) fuse ho ldersince it extends o nly 0.5 emon the back of t he pane l. Ifyou install a fuse ho lder,short out the o ld one onthe PC board. A short pieceof a potentiometer shaftworks very nicely fo r this .You must use shie ld e dcab le running to the fuseholder since the power supply of the meter generatesconsiderable no ise and thelonger input lead will pickthi s up.

The last thing I did tothe DMM was insta ll rechargeable batteries . Ifyou use your meter verymuc h, you will find thatreplacing batteries is noto nly a nu isa nce but also expensive. I used some surplus nicad C ce lls that Iordered fo r $1.50 each. Inorder to cha rge the batterie s without opening thecase , I in s t all e d aminiat ure pho ne jack in

the ot her pane l on the rearof the meter (see Photo 2).For charging, I used one ofthe littl e transformers withwhic h the phone companypowers the d ia l lam ps insome phones. The simplecharging circuit is shown inFig. 3. It yo u have one oft hese t ra nsfo rmers (w hodoes n 't?). a 1 2-0 h m ,Vi -Watt resistor fo r R4 willgive the proper charge cu rrent for 1-Ah cells. If youdon't have a transformer, aRadio Shack 12.&-volt trans-former (273-1385) will givethe proper 1QO-mA currentwith a 33-Qhm, Yz-Wattres istor . Do not try tomeasure the charge current with the batteries installed in the meter unlessyou use another meter.

It yo u make these mod ifications to your DMM, youwill have improved performance on the ac scales andthe uni t wi ll be eas ierto ma int ain . I will be gladto answer any questions accompanied by an SASE .•

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IU(E•••

Turn Signal Timeout- eliminates two-wheeled embarrassment

Thirty seconds is the limit.

Photo of the turn signal timeout.

HOWQrd R. WorthillgtQ" K IOTW17Frrmofll St.Oxford MA 01540

s there a motorcyclistwho has not felt dumb

142

and hazardous after discove ri ng that he has hadhis turn signals on for fiveminutes after making aturn? Here's a simple circu it to time them out inthi rty seconds, if youforget. A few new bikeshave a similar device; some

riders install an audible indicator-but this is notdignified, honking away.

The 555 is used as a sta ndard monos table timerfrom the Motorola LinearI.e. Data Book. Refer to theschematic. When the turnsignal switch is turned on,

pins 2 and 4 go high, whichstarts the timer and beginsto charge C2. Pin 3 ishigh, keeping the relay off.When C2 is charged to 2/3Vee -thirty seconds in thiscase -pin 3 goes low andsinks t he rel ay coil whichopens the turn signal circuit. When the turn signa lswitc h is t urned off, pin s 2and 4 go low, which reset sthe 555; at this time Q1turns off and prevents (2from being charged. so youwill have a full 30 secondsof flashing time at the nextintersection.

(3 is needed to preventfalse resetting while flashing . My theory is that ( 1'sde lay keeps pins 2 and 4high e nough to preve ntrese tt ing du ri ng the timewhen the flasher opens theci rcu it. Somehow, ( 1 hasto be elect ro lyt ic ; atantalum-type does not dothe job. Too large a ( 1causes a long reset delay.

Due to variations in forward voltage drop amongsilicon and germanium diodes. and due to variationsin flasher rates, I suggestthat the Q1 base re sistor bea 250k trimpot. I found t hatit shou ld be set a t 80k us-

The

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neui-trorucs corporation15800 Commerce Park Dr, • Brookpark. Oh io 44142 ""H36

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serous of its pu rpose!Credi t is d ue to K1lCU

for his idea, and for the useof his Kaw as a gu ineapig.•

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Schematic for the turn signal timeout.

..

It works! It's imperfec t,and requ ires resetti ng intraffic jams. It even seemsto make itself unnecessaryby mak ing one more con-

sta lled under the left sidecove r of a Kawasaki 900where, conven iently, the rewere two unused we ldednu ts o n the battery box.Afte r installatio n, my hindsight saw tha t there wasspace for t he entire kludgeunder the ta nk. The ci rc uitcou ld be made muchsmaller fo r other machi nes,if called for.

Wiring to this bike required cutting the left andright turn signal wires afterthe switch; these we refound in a harness underthe fuel tank. These fou rpoints a re then connectedto the NC re lay contacts,keeping in mind which is" in" and "o ut" for sensingpurposes .

For fully solid state, Idon't see why 2N3055-typetransistors could not beused instead of a rel ay, ifyou want to tolerate theirvo lta ge drop . Kno w in g555s, possi bly t he timershou ld be set longer fo rcold weather riders.

ing l N9l4s, and l 80k using1 N34s, in order to keep Q1on, and th us cha rge C2. Theexact re si stance requ ired isqu ite c ritica l, but prov idesreliable operat ion, o ncedetermined .

Time-out is dete rminedby the fo rmu la: Ilsec.l =1.1 x Rl x C2. R1 is in meg'ohms, C2 is in farads , andtolerances of componentsreq u ire experimentation,which exp lains my six-second discrepancy from thefo rmula .

Any OPOT relay with5-Amp, or so. contacts, and12-volt coil should do,keeping in mind the2()().mA sinking capabilityof a 555. I used a Potter &Brumfield Rlo-E1·X2·V185.

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Looking Westfrom f}ItJgt 6

along these lines is a far betteralternative than brute- forcevigilantism, which lowers thoseInvolved to the level of the ot fender himself.

Finally , to those who still feelScott l ookholder got off easy,let's look at the overall picture.Lawyers I have spoken with tellme that a viable estimate of hislegal costs would be between 4and 6 thousand dollars. Add toth is another thousand to satisfythe tine, and financially It mayhave cost him close to $7,000.Only he and his attorney knowfor sure. Then, too, he has lostthe use of something many ofus hold dear: the ability 10 communicate via his amateur station. Remember, the court madeit a provision of his probationthat he not utilize his amateurprivileges for at least a year.There is also the possibi lity thatthe FCC will beg in proceedingsto revoke his license, therebymaking his QRT period permanent. Nobody knows if this willhappen, but it is a distinct possibility. No, SCott Lccknctderdid not get off easy by a longshot. II cost him dearly , andhopefully it will be a lesson toothers who have thoughts of engaging in similar illegal activities.

While we are on the subjectof mal icious Interference, Iwould like to discuss anothernew type with you for a moment.One might almost call it "legalinterference," but it is morallywrong nevertheless. It usuallyshows up when a group of twoor three who want to see justhow much they can get awaywith take over and monopolize agiven repeater. They carefu lly

structure their remarks so as tonot violate any ru les and regulations as set forth by the Commission , but nonetheless theirstatements are constructed insuch a way as to " get the goat"of all others who may be netening . Usually, they will not recognize breakers, and those who domake It In find themselves tierassed In one way or another.These bothersome people playII strictly by the rulebook, in cluding proper station ident if ication at the prescribed Intervals. They always " stand ontheir const itutional right of freedom of speech" and in doing sotake away yours and mine. Ifthis sounds all too familiar, thenyou have such a fact ion in yourhome town.

What can be done aboutthem? First , all of us have to remember that our amateur licenses are not a guarantee offreedom of speech. Rather, it isa privilege to communicategranted by our government , andit can be revoked any time thegovernment sees lil. There areno rights stated or implied.Herein lies at least part of thesolution. Since a repeater Is nota public ut ility, the l icensee isunder no obligat ion to providethis serv ice to those he deemsare abusing it. The repeaterowner-operator has one very effective weapon at hand: theability to take away the toy fromthose who do not appreciate it.Many owners hesitate to takesuch action, fearing that a timewill come when some user willwant to make an emergency calland the system will be off. True,this can happen, but if the sameamateur wants to make this calland the repeater is beingabused by those who do not re-

speer It, he will have no betterchance then anyway. It is up tothe techn ical minds who produced the myriad of FM relaydevices which now stretch thelength and breadth of th is nat ion to fulfill their obligation tothe amateur community by tnttiating a cleanup of the bad onthe-air operation . If they do not,and if abuses cont inue to grow,they will only have themselvesto blame when the ax fallswhen the FCC and other government agencies start to do it forthem. Repeater owner-operators have more than just atechnical responsibility to erectand maintain a system. There isalso a moral obligation to ensure the proper utilization of agiven system. If they fail in this,they should not be permittedthe privilege of continued system cwnersntp. The day inwhich a repeater owner-operator can isolate himself from therest of the amateur communityis long gone. His responsi bilities are clear-cut and hemust discharge them for thegood of the community.

THE SOME·PEOPLE·NEVERLEARN DEPARTMENT

Maybe It would be belter tocall th is " Once Involved, AlwaysI nvo lved. " This might bethe motto of Bob ThornburgWB6JPI. Alter two years o f p0litical h iatus, Bob was electedearlier this month to the chairmanship of TASMA, the organization which replaced the oldSCRA In the middle of 1978. Bobsees his job as one of unitingthe various special interestswhich abound on two meters.Frankly, it looks as if he has hiswork cut out for him. WhileAssociation membership bythose involved in other aspectsof two meter operation hasbeen steadily on the rise, reopeater owners seem to be staying away as if to protect the or-

ganlzatlonal structure change.Late last year, Just around the

time of the change, a rather vileletter was circulated to many orall area repeater owners callingfor the destruction 01 the SCRAand its new open-doer policyand "a return of political powerto those competent to administer it." The letter went on to givesteps which should be taken byrepeater owner-operators to ensure that the above would lndeed happen. However- andthis is very important-the letter was bas ically unsigned, acondition which thus destroyedits overall credibility. Whetherthis letter has had anything todo with the lack of organizational interest on the part ofrepeater owner-operators cannot be determined. One thing isclear. They are staying away,and Bob will have quite a jobduring the next twelve monthstrying to bring them back intothe fold. It won't be the f irst timethat Bob has pulled off a miracle. He is very adept in that regard. Can he do it? If he can't,nobody can.

Already, Bob has supportfrom virtually every other seqment of southern California'stwo meter society, including theweak-signal people and repealer-user groups. Indeed, he is avery popular and well -respectedindividual in this area who honestly cares about his fellowman. He has taken on a very bigresponsibility, and we wish himwert.

It's hard to find a reason forthis lack 01 initiative on the partof this area's two meter repeater owners. No one reasonseems to predominate. Somespeculate that many of the oldliners who helped start votuntary coordination are just tiredof the political arena and wantcut. As with any organization,attrition along these lines is 10be expected. No one group of in-

In attendance at the TASMA meeting were Jim Rieger WA6EZLand ED Tippler WA6KYZ. Jim is probably the nation's best authority on linear translators.

148

Marlene Thornburg WD6FBI sips soda as Herb Gordon W6KBDexplains her new duties as TASMA treasurer.

dividuals can be expected tostand In front of the fi ring lineforever. In other cases, it's obviously apathy. They have theirsystems operational and notn ing else concerns them. Whyshould they get involved? Theyneed involvement like they needa headache. More predominant,however, is an unspoken sentiment which seems to say thatthe organization no longer represents those whom it was established to protect-the southern California repeater owneroperator-and that opening voting membership to all Interested amateurs has weakened thepolitical position of the repeaterowner. Therefore, why shouldan owner-ope rator bother tokeep membership in an organization in wh ich he is no longerin the majority position. Thiswas the view stated in the letterdiscussed earl ier.

Jt 's interesting to note thatth e 22D-SMA, which was formedat the same meeting , suffersnone of these ills. The 220 people of this area, system ownerand spectrum user alike, seemvery together in their goals andviewpoints. Structurally, thetwo organizations are almostidentical , yet 220 keeps its repeater owners as memberswhile two meters can't. Why theunity on 220 not found on twometers? Is it because all 220spectrum users see the USWARC proposal as a commonenemy? Is it that they havewatched the development oftwo meters and have sworn thatthe same pitfalls wi ll never occur on 220? No one can righ tlysay. However, at this time, the220 people of th is area are farmore toget her than any othergroup. Perhaps II's time foreveryone to step back and takea good look at what has putthem in such a position. The220-SMA is going strong, andwe can all learn from them.

All the above might lead youto believe that two meters inthis area is in a disastrousstate. Far from it. TASM A's 2meter band plan has been accepted without complaint, andwhile repeater owner support isdwindling , support from allother sectors of the two metersociety is strong and growing.However, making overall spectrum management work takesthe ongoing cooperation of allusers. Those who own and operate repeaters are a key part oftwo meters, and it' s to solicitingtheir active support th at Boband his staff will be dedicated.

DX·ON-A-REPEATERDEPARTMENT

Southern Cali fornia is knownas an area of " repeaters wi th apurpose." Over the past fewyears, we have seen systemsdeveloped for just about everyreason under the sun, including

one for the exclusive use ofschool children. Now, thanks tot he Southern California OXClub, even HF OXers have ameeting ground of their own.According to club presidentDave Bell W6AQ, while not thefirst system of its type in the nation, the AD6PIR system willserve as more than just a localgab channel for OXers. The clubhas great plans for the newly es·tablished system, and the tuture seems bright with promise.AlreadY,1t is used to alert members as to where the rare onescan be found . In the future, onemight even hear actual on-theair seminars on the art of OXchasing.

Whi le Its prime usersh lp Ismade up of OXers, AD6P (1 44.88in/145.48 out) Is an open repeater which lnvr tee all area erneteurs as well as visitors to LosAngeles to utilize its facilities. Ifyou happen through LA andwant to meet some of its top OXenthusiasts, then drop in on thesystem or, il time permits, attend one of their club meetings.You wilt find either one a rewarding experience.

ON·THE·MOVE DEPARTMENTJim Hendershot WA6VQP,

network director for Wesltink,asks that I pass along the newsthat the new Westlink stud iofacilities are tully operational attheir new location in canogaPark, California. The new studiofeatures such amenities as cartridge tape units used to gatherand pre-edit items for the newscast and additional post-production duplicating equipmentto cut down the reproductiontime of finished cassettes. Hesttn hopes to expand the reproduction facilities further whenfunds permit the acquisition ofmore cassette recorders.

What started a year and a halfago as a small undertaking toproduce a weekly amateur radionews program has grown to anenterprise which serves thenews needs of thousands ofamateurs nationwide. Now inits seventy-second week of con secutive operation , the westlink Amateur Radio News Setvice has become a vital link inkeeping us all informed ofevents which affect our day-today operation. 11 is still free toany group or individual whosupplies blank cassette tapesin SASE mailers. For more infermatron about this service, contact Jim al Westlink's new address: 8331 Joan Lane, CanogaPark CA 91304.

HF INTERNATIONAL:AN OUTSIDER LOOKS INIt was not until after I ar

ranged the interview with Normand Jeanne Meuller that I firstbothered to listen to the spectrum HFI calls its home, CBchannels 32 through 40. I ex-

pected to hear the same type of"10.4 Good Buddy" operationas is found on what CBers callthe "lower 23," but was quitetaken aback by what I actuallyheard . Frankly, it sounded a lotcloser to 20 or 40 than to what Iexpected . Operation seemedvery structured and in no wayhaphazard . Other than thestrange-sounding dual causrqnbit (HFI members utilize boththeir assigned FCC call signand their HFI call or " HFnumber") , the operationseemed as if it could be takingplace on any of the amateurbands. 1 was shocked, perplexed, and maybe a bit mad.After all, here I proudly sat withan amateu r license displayedon t he walt. Who were t hesepeople to play ham wi thoutbothering to be hams!

The following Sunday I metwith Norm and Jeanne. Uponentering Norm's office, I notedtwo things immediately: an absolutely marvelous amateurstation in one corner, and alarge poster of Jerry Lewistout ing HFI in relation to theannual MOA campaign. lnquieing , I learned two things rightoff the bat. It was indeed anamateur station , and Norm waslicensed to use it. " My god," Ithought to myself. " An amateurruns HFI?" The MOA posterwas also explained. HFI and itsclose to 50,000 active memberswould be participating in the1978 Labor Day Jerry Lewistelethon . I thought again 10myself: " These are the badguys who are out to destroyham radio? The bad guys every one had told me about? Someth ing doesn't jive. Bad guysdon't do nice things l ike this! "

The questions I asked rangedfrom simply what was HFI andits goals to what their officialstand was on specific matters.Basically, here is what I learned:HFI is an organization of hobbytype SSB users operating in theupper portion of the 27 MHz personal radio band. It was founded to promote the use of SSBcommunicat ion In that particular spectrum and to give theSSB CB hobbyist an organizational structure of his own. Atits peak, HFl boasted more than90,000 members, but this wasprior to the reorganizatio n.Though it is still quite largeprobably still better than 50,000at the latest estimate-no exact figure was available at thetime of the interview.

Norm asked that I make itc lear that HFI does not condonethe use of excessive and illegalpower levels or out-of-bandoperation. In his rema rks, hemade it clear that an HF numberdoes not always mean that theholder is a current HFI member.Therefore, those operating illegally between the 11 and 10meter bands are not necessarily

HFI members, t hough somemay still use their HFI numbersIssued many years ago. AU ofthe foregoing has been rerterat- 'ed to the members of HFI in recent membership mailings, inwhich Norm stressed the needlor legality in day-to-day on-theair operation. Another point Iwas asked to emphasize wasthat HFI, under the currentdirection of Norm and JeanneMueller, never backed or condoned in any way the actions ofMr. Richard B. Cooper or hisCommunications Attorney Service. Norm's basic commentarywas that Cooper/CAS was detrimental to both the amateur andCB services and would eventually cause both harm. Contrary to popular belief in amateur circ les, HFI was not one ofCooper's ardent supporters.

Norm sees todev's HFI as anintermediate ground betweenAM CB radio and the amateurservice. He would like to seeHFI take an active role in helping the CBer make the Change,with as minimal an environmental impact on the amateurservice as possible. He believesthat the education of the transfHoning CBer is the key. However, such education can onlycome about if the FCC acts tocreate " SSB only" channelswherein the AM CBer can getaway from the " 10-4 Good Buddy" attitudes of AM and learnproper operation from his SSBminded peers. HFI feels that ifsuch were the case, actual onthe-air amateu r-oriented training could be accomplished (es·pectauv if CW were permitted).

As an amateur himself, Normsees one of amateur radio 'sgreatest problems today to bethe uninitiated AM CBer whohas the technical expertise toobtain an amateu r l icense buthas never been educated In themoral and operational valueswhich amateurs associate wi ththeir hobby. He specificallycites many of the problemsprevalent on FM repeaters as anexample of this lack of properindoctrination. Again, in relation to the amateur service, hesees this as an avenue for active HFI involvement.

While HFI would like moreSSB-only spectrum for its members, Norm does not leel that itshould come from the amateurbands. Rath er, HFI endorsesproposals Which would placesuch spectrum directly next tothe current 4Q-channel Class 0allocation and above it In anarea below 10 meters (wit h abuffer zone between the tw o).HFI fee ls, however, that suchcan only come to pass if all HFmembers obey the cu rrent regulations as written-especiallythose regarding proper stationidentification at prescribed Intervals and respect for bandedge and power limitations. The

149

organization knows that only amass show 01good faith to theFCC will have any meani ng. Tothat end , HFl's literature constantly reminds its members 01these precepts.

Above all , HFI wants to become a respected member ofthe hobby radio community.They want amateurs especiallyto know that they are not theenemy. They want to be constdered as friends and workingpartners. It has taken me a yearto sit down to write this, a year01 waiting to see if I was beinghanded something substantialor just hot air. I have fo ll owedHFI's progress these past 12months , and what I was told ayear ago is subs tan ti ally t rue today. Norm and Jeanne Mueller

are two people who are si ncerely devoted to their beliefsand who are very posfuve-thtnking people. Under their leadership, HFI has taken many giantleaps toward its prime goal.

Whether you like or dislikeorganizations such as HFI isunimportant. What does countis that today's non-amateurhobby radio enthusiasts areresponsible for a good percentof all personal radio operationand cannot be ignored. Thereare many myths these days inamateur circles about how anyone who owns a CB radio is abad guy. Myths they are, and assuch they should be dispelled.There are good guys and badguys in every walk of life. Wehave both in amateur rad io, and

I'm sure that Norm has both inHFI. What is important is learning that we are all human beings with a common Interest,even though we may expressthis interest in different ways.HFI has said to us , " We want tobe your friend and work withyou." What will our answer be?You can let me know,oryou canwrite di rectly to Norm c/o HF International, PO Box 7576, River·side CA 92513.

THE WHATEVER·HAPPENED·TO·??? DEPARTMENT,

REVISITEDWi thout warning recently, the

FM a nd Repea te r co lu m nseems to have disappearedfrom QST! It 's well known thatlis editor , Lou McCoy WllCP,

has retired from act ive Leagueduties and now lives in one ofmy favorite places, New Mexico. I sincerely wish Lou manyprosperous years of ret irement,as well as many more happyyears of hamming.

However, Lou's depart ureseems to have left a rather biggap in Newington, one tha tshould be filled quickly. In thisday and age, when FM is on thelips of virtually every amateur,OST cannot afford to be withoutsuch a service to the ARRLmembership. The column isnecessary, and I, speaking asone ARRL member, would liketo see it re instated. Perhaps oneof you read ing this Is willing tooffer your services to the ARRL.Lou did a f ine Job with it , and hisact will be hard to follow.

MicrocomputerInterfacing_ _ ------'

from PIIfII128

This means that one scbroutine may call another. In thisway, a con tro l subroutine may,in turn, call a timer subroutine.When the timer subrout ine hascompleted its task, it causes areturn to the control subroutine.This situation requires twolevels on the stack, or four R1Wmemory locations , since twolull te-bn return addressesmust be maintained on thestack whi le the timer subrouti ne is In operation: (1) thereturn address for the timer-tocontrol link , and (2) the return

address for the controt-to-matntask link. The stack operationstake place automaticallywhenever a call or a return is executed. The call and return mstructtcns may be either conditional or unconditional , buteach subroutine must containat least one return instruction.

Recall that the 8080chip contains seven B-bit general purpose registers, the accumu lator (A), B, C, D, E, H, and L. Inprograms where subrou tinesare used, there may be registercon flicts si nce the subrouti neand the main task ma y both reoqui re the use of a specific

regis ter. Sometimes t his problem may be solved by choosi nganother register, but this Is nota lways possible , particu la rlywhen the A register and thefl ags are involved. To avoidregister conflicts, it is possibleto use the stack lor temporarydata storage. All of the internal8080 registers may be pushedonto the stack and poppedback into the 8080 as needed.Data is stored and retrieved asregister pairs, with register Aand the flags forming a twobyte word which Is treated as aregister pair.

The su brou tine In Table 1 is atime delay rout ine In whichregisters D, E, A, and the flagsare stored on the stack. At thecom pletion o f the SUbrout ine,the data stored on the stack isretrieved and placed bac k inth e internal regi sters. The comp lementary operations of stack

storage and retr ieval are calledpush and pop, respect ively.Notice that the stack pointer isin it ia lized at the start o f theprogram, before any other instructions are executed.

The use 01 subroutines in aprogram allows many complextasks to be subdivided in tosmall segments which are easyto link together and whichrelieve the problem of continuously rewriting Irequentlyused prog ram steps and routines. You will lind that a personallibrary of frequently usedsubroutines is tndtspensrbrewhen you are programming.

,,,,.o.M ocuqoe L.. E"" r '''G

e'JlQJlr

,I . >0<>1' Sot

.. - - - - -, l EACH1 '2.'''Zge I ...

"

Both errors are in Fig. 15. InFig . 15(a), the error Is caused bya possible " smear." At the topo f the f igure, near the middle,there is a pad lor the - 5-Vregulator. This pad is shownconnected to the adjacent circuitry by a fine line. This fineline is possibly a " smear" fromthe original silk screen andshould be removed.

The second error will raise alot of eyebrows. Basically, it isan invers ion. The grey area of

REVISW-,~ ,,,,

"

~

l\l n..... ",..~,

C A302M

~

" ,, Ie

,

("Building an Economy Receiver").

I have enclosed a copy 01 arevised i-f circuit which doesuse currently-available components.

Tom McLaughlin WB4NEX51. Petersburg FL

There are two errors In my article, " A Single IC Time Ma·chine," which appears on page148 of the February Issue.

M'LL..l R 20~1

•,,

,, .

8902·8 I-f units which I used inmy circuit on pp. 48-49 of theJanuary, 1979, issue of 73

•j :

I,,I,,

[l'ST'..G....C1.llCU' r

,.'

I have recently been advisedthat J. W. Miller Company nolonger has the 8901·B and

Fig. 1. Revised i-f c ircuitry, " Building an Economy Recei~er. "

Resistors are 'tr- W, 10%. Miller 45~kHz transformer: #2041-input 25k, 6OO-Q impedance; tl2042-output 25k, 1·kQ impedance.Transformers are a~aiJable from J. W. Miller Company, PO Box5825, Compton CA 90224.

r-~ ~ V'S£\l

I C'~C1J!T

Corrections

150

Reprinted from the Federal Register.

the PCB of Fig. 15(a) should berotated 180 · on the darkeroverlay.

H. M. Knickerbocker K6SKLa Mesa CA

In response to a leiter fromone of our readers, Lee AeedW5VRC (ex-W4ABL), aut hor of"Build An Economy ZenerChecker" (February, 1979, page137), would like to comment onhis zener checking circuit.

The problem is the inherentdanger of a t tanatormertessli ne-operated power supply.

Should the " hot " side of theac l ine be inadvertently connected to the "common" side ofthe unit, as it would if the ac

ReviewW hen the 1979 Radio

Amateur's Handbook made itsappearance last November, Iwas probably the f irs t on theblock to pay $9.75 and take apaperback copy home. TheARRL has put a lot of effort intopromoting the 1979 Handbookas being new and different. My1974 edi tion is worn from heavyuse and I moved it aside, making room tor tne newcomer, wi tha bit of re luctance.

The most obvious change inthe new Handbook is the size.Like QST, the License Manua/,and other League publlcatlona,the Handbook has gone to thebigger 8% " x 11" fo rmat. Thenew size makes older Handbooks look small and unimportant, but a quick weighing revealed that it was a scant 3V2ounces heavier than t he 2pound 1974 edi tion .

Old-timers will be glad toknow that Ohm's Law is stiliV = IR in the elementary theorysect ion. The basic principleshaven't changed, but t he theory

FCC..........Tfu. UTIA CLASS LICENSf

EII..Ina.l", a..n'lnll 0' (ANI' Toword 'h. T..lollroph" '."Ion of bo...ln.....n .. Fco..-..Hold....1 .... A"'....... biro fl..1 Clo.. u_

"."ADENCY: Federal CommunicationsCommission.

ACTION: Notiee of proposed rulemakIng.

SUMMARY: The Commission i'I proposing to delete § 97.25<d) from ItsR u les. T h IS proVid es credit toward thetelegraphy portion of the AmateurE xtra Class license examination toholders of the former Amateur Extra.First Cla.'<S license and Its successo r licenses.

DATES: Comments shall be filed byAp r il 30, 1979. llnd R e p ly comments

plug were inserted backwardsinto a receptacle or if the acsocket is miswired, it is cosetble to get line voltage betweenthe common side (which theuser may be holding) and an external ground.

As a remedy for this, the useof a small isolation transformeris recommended or, at the veryleast , a lk 2-Watt resistorshould be added in series withthe fuse.

A few dollars spent on atransformer is certai nly worththe safety wh ich it affords.

Gene Smarte WB6TOV/1News Editor

In my a rticle i n t he

chapters have been either completely or partially rewri tten.Bot h beg inning and experienced hams will fi nd the "RadioDesign Tec hni que and Lan.guage" chapter useful. In addit ion to a comprehensive discussian on tu ned circuits, a qlcssary of radio terms is included.

A chapter on vacuum-tubepri nciples will not be found inthe 1979 Handbook; in Its placethere is a greatly expandedchapter on solid-state fu ndamentals. The Handbook editorshave l imi ted the coverage ofthis vast topic to those devicesand applications that are mostapplicable to general amateuruse.

The chapter on HF transmitti ng con tains a nu mber ofcharts and graphs that enmtnate some of the drudgery of design calcu lations. The Hand·book's new size seems to lenditself well to this kind of presentation. Throughout the edition, graphs and charts are ln.eluded . One conspicuous area

shall be flied by M ay 311, 1979.

ADDRESSES: Comments sh a ll betiled with: Secretary, FCC, 1919 MStreet, N.W., Washington, D.C. 20554.

FOR FURTHER l NFOR M ATIO NCONTACT:

Mr. P h lHp W , Savitz, Personal RadioDMsion, (202) 632-7175.

SUPPLEMENTARY INFORMAT ION:

Ad op t ed: February 14, 1979.

Released: February 27. 1979.

By the Commission: CommissionerQueUo absent.

I , In accordance with t h e Adminis_trative Procedure Act,S U.S.C. 553,lU\d § 1.412 of the Commission 's RUles,the Commission hereby gives Notice ofProposed RUle Mak ing In the abovecaptioned matter,

September , 1978, issue("Nuclear Att ack !" ), I left out avery important" = " at step 193,Here is a procedure to fix theprog ram:1) Load the bad program intomemory;2) Press:GTO 193LRN2nd Ins

LRNThis will insert the" = " be

tween the "B" and t he "X" . Iapologize to all.

I have been receiving requests for a version of the gameto run on the Tl 58159, I will beglad to send anyone a programl ist ing for this machine, provid-

is missing, however. Gone is theindex of tube specifications andbase diag rams, The token coverage of solid-state devicespecs has also been deleted.

One of the most repeated lymentioned attributes of the1979 Handbook is the " NarrowBand Voice Modulation" chapter. The Handbook's coverageof NBVM is largely a rehash ofthe QST articles and , in somecases, is a word-tor-word reproduct ion , Experimenters look ingfor parts suppliers and discretefilter design information will bevery disappointed.

In the enthusiasm fo r NBVM,such modes as Rny, slowscan, and facsimile seem tohave been forgotten, It i sironical that a book devoted tostate of the art neglects even ashort reference to these " specialized communications techniques" t hat many ham/experimenters are Involved in.ARRL pubnceucns are sorelylacking in this area.

In keeping with the state-ofthe-art theme, the FM and reopeater chapter includes information on tone-decodi ng circuitry as well as a " practicalsynthesizer," However, there is

2, D u r ing t h e period rrom June 1923to June 1933 the Fed.. ral Radio Com.mission Issued Amateur Extra FirstCilLSS operator llcenses. SubsequentlY,the eQuivalent license Issued by theFederal Communications Commission11IM designated "Class A," and then,.Advanced."

3. In 1952 the CommiSSion createdth.. Amateur Extra CIlLSS license . Ob·taining this license rec utees successfulcompletion of written examinations Innine areas of basic, general, Intermedl·a te and advanced amateur practice.ThO'S<! written examination recut-e.ments are muc h mOre stringent t hanthose associated wttn the AmateurExtra First Class llc ..nse . Ho v.'ever . thet<"legTlLphy proficiency requirementfor the Extra First license was 211words per minute, which Is the sameILS the current requirement for theAmat<"ur E xtra Class license,

4. Recognwing this identical t<"legraphy reQuirement, the Commission, inIts Report a nd Order In Docket No .19163, released on September 13, 1972,amended §97.251d ) o f It.. Rules to erevide that credit for the telegru.phyportion ot the Amateur Extra Class

ed the request is accompaniedby an SASE.

Dan Everhart WA7WKA293 Lander Hall

University of WashingtonSeattle WA 98105

In " Impedance and OtherOgres" (February, 1979, page47, column 1), the fourth andfifth lines from the bottom read,in part: " ... PAY = ERMS xCos 8." Since we do indeedbelieve in Ohm's Law, the formulashouldread: PAV = ERMSx lAMS x Cos 8. To our read

ers and Georg Simon Ohm, weapologize.

Gene Smarte WB6TOVNews Editor

no complete schematic for anFM transmitter or receiver . Inthis chapter as well as in mostof the others, the editors havechosen to include many subclrcutts dealing with a specif icpart of a rig.

The chapters on propagation,transmission l ines, and antennas have been partially rewrit ten. Theory sections tend to bemore mathematically orientedthan ea rlier ed it ions, wh ilespecif ic construction detailsare fewer.

If you are an "applianceoperator" who doesn't care howyour station works, then youmay find the Handbook to be awaste of money. Highly knowledgeable hams looking for thelatest in microprocessor controlwi ll probably be disappointedwi th the 1979 Handbook. Begi n.ners searching for a wire -bywi re description on bui ld ingtheir f irst rig may be fru stratedwith the Handbook's contents.Like its predecessors, the 1979Radio Amateur's Handbook isnot a rigorous text on electron ictheory; instead, it is a referenceand idea book for hams w illingto think,

Tim Daniel N8RKOxford OH

examination be granted to Ilppllcan t..who p resen t proof of having continuoously held the Amateur Ex t ra FirstClass llceru;e and Its SUCcessor licenses.

5. Section 97.25(d) has now been ineffect fo r more th .... si x years. Recent·Iy, the number of persons seeking examlnatlon credit pursuant to this pro·Vision hM declined to the point wheresuch an appncanon Is now a rarity, AsIt appears that §97.25(dl has becomeobsolete, the Commission is proposlnrIts de let ion Irorn the Rules, effectivesix months from t h e adoption o f suchan o rder. This delay will give Ilnyformer ho lder of the Amateur Ex t r aFirst Class Ilcense who may remain atlnal opportunity W receh'e t e leg ra p h ycredit toward the Amateur Extra Classexamination.

6. The specific rule amendments .... eare proposing are set torth below. Au·thority for these proposals is contained in Sections 4(1), 5<e), ....d 303 otthe Communications Act o f 1934, asamended. We Invite interested partiestc submit comments concerning ourp roposals on or before Ap r il 30, 1979,and reply comments on Or before M ay30,1979. An original and five copil'S of

151

Arl'E"I>'x

Pa.rt 2 of Chapter I of Title 41 of the Code of Ft'dera! R e lll:Ulatlons II amended as follo....s:I . In section 2.106, loot not e NOt5. and footnote NO 82 lore amendl'd to I'f'ad ... follo ...·s:

1 Z,IM Tu le 01r"'l....""'J allora........

Jurlldldlon on ' r rad io . tatlo lll o n theNorthern M II.rlana Islands PUled fromthe Hlah Cornm.issio....r to the F'f'dtra!Communications Comm_on.

2. Certain amendmtntl to the ruinlO"ernlnr the Amateur RadIO Stl'V1ooeIn P&rts 2 and t'I of the Cocnmlsslon ',Rulea an roae try to ~nKt thechanae ol ltatUl o f the Northern MarIana laIanda. fio minor amt'ndmentlto P&rts 2 and t'I concern the ffPQu..ncy ban<ll available to amattur radioOPf'raton On the Northern Mariana I..1andl. The Northern Mariana blandslie In Rtglon 3. Mo:st of the ""'t 01 t heUnitt<! Stat.... !le" In R"lII:lon 2. Inte rnaUonal allot"a1lons tor t he Am,teu rRlIldlo SPrv lN! are d lffer!"nt lo r Rt'glon3 than for R e" lo n 2. Footnote N0 62 to12.108 and 11fl ·61(b)(4) a rt' being

W.o."".". DC Pun l ..nrr Povr ... ' I' WArn

am..nded to refk'oct thla.3. The other t'110 amendmtntl con

<.'I"m the use 01 the 1600-2000 kHsama teur band. Btnuse thll blond illshared with the radlon&TiPtlonILORAN-AI """t.ce. Input PO"-Iff IaUm ltt1l I.lX'Ordlna to aPOlTUlhlc &rPLThe charts in lootnote NOIS to p. l lMIand 1 W1 .11ltb Il21 an bO'in, am..ndPd toadd tht Northnn Mariana 15lands tothe list..

4, Authority for these rule "han,eeIs con taJned In s..ctlons 4(1) and 303 o rIhe Communications Act of 1934. ~CllUSl" t h f'IP am..ndments arc b&ldcallym inor cha n" ... In the ru lt-s t o re tlmthe addi tion of the Northern MulanaIIlan<ll to the Commission'. Jurisdlc·tlo n . t he Commission finds that. lorgood CloUse. the notice and public pre-

••

FEI>I:RAL CO U...CATIO..SCOllll .. ISSIO .

W' LLI ....' J . TRICARICO.Sec...tart/.

cedurH provilllOJ\l o f t he AdmlnLnra·uve Proc-edure Ad an una,""e oary (SU.s.C. U3(b lJ. For more lnforma Uo nabout thf'IP rule ehan,ps. con tact Mr.Robert cu.ler. P'Praonai Radio DlvI.sion, FCC, 181' " M" S t ......t, NW"W...~on.. D.C. 2OS!>4 (202-6346620 ).

5. Accordtnlly. It .. ordel"f'd t hat. e ftecuve MalTh 13. I'U. Part 2 andPart 11 of t he Commlalon', Rul... anamended ... set out In the Append ht .

, 8eca. 4. )03. tI Sl-al .. .. ammded, 10M.1(182; 47 U.s.C. n t. 301.1

•••••NOU ' ••1..1 · ••I U · ••

all commenla and ",ply comments' haU bO' furnlshO'd t he Commission.pursuant to Il.411il o f t he Ru l'"4. Re,p<m~nlllohln, each Cocnmilllionerto have a ppnonal copy of the com·menta may submit .... IoddIUonai siseopl<!l.. Membfors o f the public wilIhln,to npresl IntpTft1. In our propollollbut u.nable to provide the fPQul~

eopln m&Y partlcl~t.P Inlonn&lly byIlIbmlttlnl: o ne copy of their rom·!Dent&. without ~U11 to fonn. pro'fidO'd the corrort Dodtpt numbO'r illN>«=illed In t he hpadlf\l of the com·ments. AU comments ....d reply com·mftllll flI<'d in thll prOCPP'dlf\l sbouldbe aent to t h e 8Pcretuy. Federal Com·m unleatlo l1ll CommiMlon. WuhliaWn.D.C. 20!>54.

7. Individuals wlshln" to Inspect t hecommentl and rep ly commentl fIlO'd Int h la p~in" may do &0 durin" ",,,uII.!' business ho un, 8:00 A.M. to S:30P .M.• Monday throu,h Friday. in theCommission', Publle ReferefiU Room.I tt t " W" Stnoet. N.W.• Wuhinlton,D.C. 2OS54.

• . Por further Inlonna tton con lartWr . PbUip W . Snit&. Pfononal R&dlo[)I . \Ilon" FCC. 1tl' " M" Stffl't. NW.Wuhlnlton, D.C. 2OS54. (202) 632'JUS.

NCHl2 Consistent with Rl'&OluUon 10. Radio Re,u latlollI. Oeneva. 19!>9. In te rr"lI:lonal amat"ur contl\cla In thll band&hould be limited to th.t portion bO't'll""n 1000 .nd 1100 kHz. In the band 1100 to 1300 kH :r., t h e provlslo lll of No. 111 o fthe Radio Relll:UlaUonJI. Ofoneva. 19S' . I./"P aPpllCllbtlT. In addltlon, 1100 to '7300 Ulz ill not av&llable In the fo llo...·inlll: U.S .PO. Halonl' Bu er. canton. £nderbury. Quam. HOWland. Jarvil, North ..m MarianI. Islands. Palmyra. ""'erlean samoaand W .....e Is lands..

PITt t'I ot Chapter I of Title 41 o r the Code of Federal ReculltUo no la am..nded l01I lo llt"" s:2. In 8ect1on I'l _II , parqt"l.&)hl lb lt21 and Iblt41 an am..ndf'd to ...ad ... folio·....::

It7AI A..tllo.b 1""1 "" -..

'_ 'UI ,--,- I __ .n~ un_,_ ._,nI.- ,~ ,~ ,~ ,~ ,~

Do. ".,.ht OI>" .. ..n' Do,,"op, Do>'., H..-ht Do>'/ .. ..h '

• • • • •11&I.... ean.-. ""'""""'IT. H",,'and ._ 'OOin • • ''' /U ,../ 21O uom. l o h ......... ""<h'.,. "on",,'"......... ...._..._......._.__........._....._..- • • • • ''''2S..m ....... _ ........... _ ...................... ._ ~,. • • ~'"

~,.

• • • • •

.~,- ' ... ·I I':S ,n~·_

,~ ,~ ,~

Do>', .. ",h' OIJ< ,H.. h, Du/H..h,

• •

• • l00,~J

• • ,.. ... u• • ~,.

• •

•••••••

flUS [Am....d..d)

I. In 1 91.2!> para"....ph Idl I. d ..let.Pd....d pal"alll"aph (e) Ia 1"f'dt'.lrna t ed upvag....ph Id l.

",IIT 2-fI.EQUENCY AUOCAnoNS.ND 1.010 TI.EATY MAnnS:GENUAL lUUS .NO lEGULA_TION'

'.IT 97-A.MA.TfUll.OK) SEIlVICE

Fl::Dl:LU COllllIUIIIlCAr,o ..5Collllllllt...IO".

Wllll.ul J . TltICAII..CO.s«...tct'll'.

The Federal Commun l.,.,Uono Com_m~lon proposeo to am..nd PITt 9'1 ofChapt.Pr I of T itl e 47 of the Code ofF ..deral Regulatloltll ... fo llow. :

141 3lK1().-4OOO kRs and 'IUll).. T300 kHz I./"P not available In t he follo..lntI: U.s. __ions: Baker. Canton, Enderbury.Quam. Howland. Jarv1.I. the Northt'fTl Martana 1I1ands. Pll.lmyn.. Amerkan samoa and Wu p 1I1anda.

MAll,.• .,.. DC Pun IlInrr Po',,, ,,,, . 11 Wun

,-. ,UI 1$21 1I!oO ,.... II., ,n'_ '100 ,toO ' .~I '921 ''''>0 ,.... ,,'. '.".200{1.- '", '", '", ,", Ina k" a ,", I< U.Do" " ,. h, Do, /N;. h ' Doy/N•• n< ''''I1 t1I.", Do.,"L.'" Day/N I,h' ,,,,,,,,'.'', Day/NL.".

• , • • , • •

............,..... _'''''IT, H~.\and ._ '00':11 • • 'OO,.~ '00 '21 • • ,......0 .............-..... ......... Non""....- • • • • '00:21 • • 1". 21- - ~,- • • _ :1<1 -,. • • --• , , • • • •

IHam HelpAn obviously demented 73

author Is looking for 455-kHz i-fcomponents. These may be anything from standard l-I transformers to mooeratelv-prtceccrysta l and ceramic fil ters.

They must be easily appliedand usable with a wide range ofsolid-state devices, from junkbox transistors to IC devicesalso, with tubes if possible.They must give good results inan i-I strip used lor CW andforSSB receiver use.

Manufacturers, distributors,or surplus dea lers toon strenough to provide me witht echn ic al info , applicationnotes, and an easy way for 73readers to get their hands on

•

TR·3 , the TA·4, injects a tone in10 the grid of the VOX ampl if iercircuit. Possibly, the same maybe accomplished with the TR-3.

Ron Yokubaltls WBSTKQPO Box 3554

Austin TX 78764

I need the RCA manual seclions for t he hig h·band CMC-60FM eo·Walt "boat anchor" rig(t ransmitter and dynamotorpower supply only). I w illduplicate and return w ithin oneweek.

Jack Myers W3RU5740 Aubergef Dr.

Fairf ield OH 45014(513)-829-0511

I need help with an SA-G802-the schematic diagram orowner's manual, preferably.

Walt Persans WA2ZBE135 Roe St.

Staten Island NY 10310

•••

Alexander MacleanWA2SUT/NNNIZV8

18 Indian Spring TrailDenville NJ 07834

I need help in converting aDrake TA·3 to semt-breek-tnCW. I feel that there must besome circu its for this obviousimprovement of the TA-3 whichpossibly appeared in ham magazines in the 60s.

At present, my ts-vear-crcTR -3 mus t be manuallyswitched between transmit andreceive. The successor to the

the goodies may find themselves pestered unmercifully by73 readers wan ting to purchaseparts to see if the circuit reallyworks.

••

Ibl · ••121 · • •

. _ .........b .f 11Ilo. CoMom;"1II thoNorttoom M.rl.no Id...d.

AOENCY: Fedtora! Communicat ionsCommission.

AC.-n O N: Order IRulemakln, ).

SUM MAR Y: T he Northern Marianablands h... r ...,..n tly bHn added to theCommlsslon's Jurl.<dI~Uon. Certatncharts and table. In the amateu r rutes..... bO'lnJl am..nded to I'f'nect thillch an, e In the CommlMlon ', Jurisdi"·tlo n .

EPFECTlVE DATE: M~h n . 19'19.

AOORESSIS Ffodorral Conununica·, ..... ComlniAlon. 1'1' " M" St.. NW~WIolhIf\lton. D.C. 206iW.

roR FURTHER INPORN:.ATlONCONTACT;

Mr. Robert cu.... r , Prh..te R adioBureau 12tl2-4lU-et'l201.

SUPPLEMENTARY INFORMATION:

I n t he matt.Pr of amendments o fP&rts 2 and n 01 t he Q)mmllSlon',rul... conN!rnlna the Northern Mariana IIlan"'.

Adopted: FebrUAr y 22. 1919,R e leased: Mareh 2. 1979.By the Commission:

I. On January 9. 1178. u a steptoward nentual POlIUcaI union withthe United S tat N ... a Commo n"",lIh. the Northern Ma.rtana IIJand1t(':lome under the Jurladlctlon of thoselit.. 01 the United Stata ...h leh haveaenenJ I.fIpllcabUlty to the aeveralStain.. ~viousIy, th_ Islands 'l(ereadml nilte~ by t he United Stata forthe United Nationl ... PUt of theTT1IIt T ..rritoq of the hellk: W ....<ts.and those peraolll ieektnl autholizl.·tion to operate a n.dto ltallon ~~ reQulred to awly to th.. Rl,h CommlIalon..r of the Tt-ust Territor)' of thePactflc W ....<II. AI of Januuy , . IIna.t ht Communler.UOI\I Act 01 1934.be lna a IItw 01 "tnera! applll'ahlllty tot he Sl"ver&1 Statt&. bteame applicableto the Northtrn Mu lan , 15lan<ll. and

152

The Sangre de COSIo Mcu1talOS· ETOS backyard

WHY WISH YO'"' UG

ContestsTransmitting Stat ion

HAMU.S. Na vy Communicat ions AreaMaster stencn. Norfolk VA

Frequenclea (kHZ)

4005. 7380, 14400

Table 1.

t inuing climate of mutual assistance and warm esteem. Saterday, May 19, 1979, has beendesignated as the 30th AnnualArmed Forces Day.

A featured highlight of the nationwide celebration will be thetraditional rntttt ary-to-amateurc ro ssban d co mmunicat ionstests. These tests give amateuroperato rs an opport unity tode monstrate th eir individualtechnical skills and to receiverecognition from the Secretaryof Defense or the appropriatemili tary radio station for theirproven expertise.

The proceecmqs will includeoperations in con tinuous wave(CW), si ngle sideband voice(SSB), radioteletype (RITY), andslow-scan television (SSTV).

Special commemorative QSLc ard s wi ll be awarded toamateurs achieving a verifiedtw o-way radio contact with anyof the participating mi litaryrad io stations. Thos e whoreceive and accurately copy theArmed Forces Day CW and/orAnY message from the Secretary of Defense will receive aspecial comme morative certificate from the Secretary. Interception by shortwave Hsteners (SWLs) is not acknowledgedby QSL cards ; however, anyonecan quali fy for a cert ificate bycopying the Secretary' s mesosage.

Crossband Radio ContactsThe mlllt a ry-t c -a m at e ur

cro ssband operat ions w ill beconducted from 19/1300 UCT(Universal Coordi nated Time) to2010245 UCT May 1979. Militarystations will transmit on selected military fr equencies andlisten for amateur stations onthose portions of the amateurbands indicated in Table 1. Themilita ry operator will specify theparticular frequency in the amateur band to which he/she islistening. Durat ion of the contact should be l imited to threeminutes.

7.2·7.3

3.775-4.0

3.5-3,65

3.65-3,757.00·7.0257.025·7,0507.050·7.07514.00·14.025

21.0·21.221.27·21.40

7.015-1.1

G'HU.S. Navy Communication Station 1394. 1.520THURSO, SCotland, United Kingdom

HPOU.S. Navy Communication Station 4010. 13H.5. 13922.5Stockton CA

1•.075-14.1

NOTU.S. Navy Communication Station 7430. 15500vokosuka. JA

WAAHeadquarters, U.S. Army 4030, 6997.5,14405Washington. D.C.

" A2045th Communications Group 4025, 7315. 13997.5Andrews Air Force BaseWaShington, D.C.

Table 2.

14.0.14,121.25-21.45

7.050-7.100

14.25-14.35

14.225-14.250·

3.5·3.75

3.775·4.0

3,65·3.7757.0·7.15

14.G- 14,221.25-21.45

3.9-4,0

7.25-7,30

1.025-7.2014.025-14.20

14,275-14,350

14.225-14.250°

AppropriateAmateur Bind (M Hz)

7.00·7.050

rad io fra ternity and militarycom m u nication s sys tems .Since 1950, this event has beenscheduled during the month ofMay and has emphasized a con-

•

CW

lSB

lSB

lSB

cwl SB

LSB

CW

lSB

USB

AnY

AnY

SSTV

EmlsalonAnY

AnY

1341.5

13922.5

4001.5

4020 (4021.5)

4D25 (4D26.5)

1305 (1306.5)

.tOOl.5 (4003)

4005

aces

6910 (6911.5)

14390.5 (14389)

7380(1381.5}

1«4D (1 4396.5)

14455

MIlitaryFrequency (kHz)

7385

1315 CW139n.5 ON

14391 (14398.5) USB

13915.5 (13913) SSTV

4010 CW6989 CW

1301.5 (1303) LSB1365 CW14315 CW20983 CW

20998.5 (20991) USB

4030 attv6991.5 CW14405 CW

20994 (20992.5) USB

the contest committee will consider more cert ificates.ENTRIES:

Logs wi ll be fi lled out separately for each mode. Logs willfollow th e standard form andmust be mailed before 30 June1979 . Address entries t o :LABAE, UIT Contest Coordination, PO Box 07-0004, 70.000Brasilia, DF, Brazil. Logs received after August 30 w ill notbe computed for awards. Include a OSL, a sell-addressedlabel, and IRCs for personalcontest results. Note: Look forspeciallTU calls worldwide!

ARMED FORCES DAYMay 19, 1979

This year's observance ofArmed Forces Day marks threedecades of communicationstest s between th e am ateur

1<385 CW20988.5 (20981) USB

HPlNa vy CommunicationStationSan Diego CA

' SSTV from NAV will run Irom 1300-2100 UCT 19 May 1919• · SSTV from NPL will run from 16Q().2400 UCT 19 May 1919

NNNI)N CGUS Coast GuardMARS Radio StationAleu ndria VA

NPONavy CommunicationStationStockton CA

511110nNAVHeeocceners, Navy·Marine Corps MARSWashington, D.C.

NNNOMETUSMC Air Station MARSRadiO StationEI Toro CA

AWARDS:The lTV Trophy will be award

ed to the country which earnsthe highest number of pointscomputed as described above.The country which wins for 3consecutive years or 5 interlaced years wi ll remain inpossession of the trophy. Thetrophy will be awarded to therepresentative national association of radio amateurs of thewinning country. Gold , si lver,and bronze medals wlll beawarded to the 3 highest scor ing rad io amateurs in theworld on each mode. Cert ificates will be awarded to thehighest-scoring rad io stationsIn each country on each moc:le.Depending on the number ofcontestants in each country,

f rom page 21

"AU.S. Ai r Force MARSo'SITFA Radio StationWashington, D.C.

NNNONHZCINCL.ANTFLT MARSRadio steucnNor/o lk VA

WAAHeadquarters, USArmy MARSWash ington, D.C.

154

CW Receiving TestThe CW Receiving Test will

be conducted at 25 words perminute. The broadcast will be aspecial Armed Forces Day message from the Secretary ofDefense to any amateur operator desi ring to participate. Aten-minute CO call for tuningpurposes will begin at 20/0300UCT. The Secretary of Defensemessage will be transmitted at2010310 UCT from the stationson the listed frequencies inTable 2.

Rny Receiv ing TestThe Radloteletype (RTTY)

Receiving Test will be transmitted at 60 words per minute.Radio station " AIR" will t ransmit using 850 Hertz (wide) shift.All other stations will transmitusing 170 Hertz (narrow) shift. Aten-minute CO call for tuningpurposes will begin at 2010335UCT. The special Armed ForcesDay message Irom the Secretary of Defense will be transmitted at 2010345 UCT. This testis to exercise the technical skillof the amateur operator in attaning and adjusting equipment.Transmission will be from thesame stations and on the samefrequencies as listed for the CWReceiving Test.

Submission of Test EntriesTranscriptions shou ld be

submitted "as received." No attempt should be made to correct possible transmission errors.

Time, frequency, and call sign of the station copied aswell as the name, call sign, andaddress (including zip code) 01the individual submitting theentry must be indicated on thepage containing the messagetext. Each year, a large numberof acceptable cop ies arereceived with insufficient identification information, or thenecessary information was attached to the transcript andbecame separated, therebyprecluding the issuance of acertificate.

Entries should be submittedto the appropriate military command and postmarked no laterthan 25 May 1979.

Stations copying NAM, GXH,NPG, or NDT submit entries to :Armed Forces Day Test, Chief,Navy-Marine Corps MARS,Bldg 13, NAVCOMMU WASH·INGTON, Washington , D.C .20390.

Stations copying WAR submit entries to: Armed ForcesDay Test, Commander, UnitedStates Army CommunicationCommand , ATT N: CC-OPSMARS, Fort Huachuca AZ85613.

Stations copying AlA submitentries to: Armed Forces DayTest, 2045th COMM GPIDONV,Andrews Air Force Base, Washington, D.C. 20331.

MASSACHUSETTsaso PARTYStarts: 1200 GMT May 19Ends: 2200 GMT May 20

This year's contest is sponsored by the Greater New Bedford Contesters. A station maybe worked once per band, withphone and CW being separatebands for the purposes of thiscontest. No crossband or repeater contacts are permitted.Mobiles and portables may becounted as new contacts eachtime a cou nty change takesplace. DX stations count foraso points only when workedby MA stations.EXCHANGE:RS(T) and MA county or staterVE province.SCORING:

All stations count 2 points fo reach completed SSB exchange,4 points for each CW exchange.MA stations multip ly asopoints by total MA countiesworked plus states and provinces worked. Out-of-state etatlons multiply aso points bytotal number of MA countiesworked . As an added bonus,add 5 points to your total scorefor each sponsor stationworked (W1FJI, N1AS, K1KJT);sponsors can only be workedonce for bonus points.AWARDS:

Certificates wi ll be awardedto tst, 2nd, and 3rd place winners in each MA county as wellas each state. Two specialawards wi ll be given-one tothe ARC with the highest aggregate score In MA (min. of 310gs),and a second award to the station in MA who submits the alltime highest number of asos(now held by N1YY at 664 asosin 1978). In addition , a certificate will be given to stationsworking all 3 sponsors .SUGGESTED FREQUENCIES:

CW only-1810, 3560, 3720,7060,7120, 14060,21060,21 120,28060,28120.

Phone only-1820, 3960,7260, 14290, 21390, 28590,50.110.

Use of FM simplex is encou raged; CW must be in CWbands only !LOGS & ENTR/ES:

Logg ing must conform toFCC rules-date, time, band,mode, callsign, state and province worked, exchange RST.Submit separate summarysheet along with logs. Summarysheet information: name, call,mailing address, club affiliationfor aggregate score, total asopoints, multipliers, and totalscore. Deadline for mailing isJune 30. For awards and reosuits, send an SASE to ArthurMarshall W1 FJI, 60 MeadowAd., Westport MA 02790.

MICHIGAN aso PARTYContest Periods

1800 GMT Saturda y, May 19to 0300 GMT Sunday. May 201100 GMT Sunday. May 20 to0200 GMT Monday, May 21

Sponsored by the Oak ParkARC wit h phone and CW combined into one contest. Michigan stations can work MI count ies for multipliers. A stationmay be worked once on eachband/mode. Portable/mobil esmay be counted as new contacts eac h t ime co u ntychanges.EXCHANGE:

AS(T), a s o number, QTH =MI county or state/cou ntry.SCORING:

Multipliers are counted onlyonce. MI stations score 1 pointper aso times sum of states,countries, and MI counties onphone. Each CW contact is 2points per Q50. KL7 and KH6count as states. VE counts as acountry. Max. mu ltiplier is 85.Non-M I stations score a s opoints t im es nu mber of MIcount ies. aso points are asfollows: 1 pt. for each MI phoneaso, 2 points each CW aso, 5points each clu b sta tion contact W8MB. Max. mul tiplier is83. VHF·only entries same asabove except mult ipliers perVHF band are added togeth erfor total rnuttrpuers. No repeatercontacts allowed, but 5 poi ntsfor each OSCAR aso.FREQUENC/ES:

CW-1810, 3540, 3725, 7035,7125, 14035, 21035, 21125,28035,28125.

Phone- 181 5, 3905, 7280,14280,21380,28580.

VHF-50.125, 145.025.AWARDS:

Only single-operator stationsqualify. MI trophies to high MIscore, high MI (upper peninsula)score, high aggregate cl ubscore. Plaque to high VHF-onlyentry and high mobile. Certificates to high score in eachcounty with minimum of 30asos. Out of state-high outot-stete trophy and certificatesfo r hig h score In each state andcountry.ENTRIES:

A summary s hee t is requested showing the scoringand other pert inent informat ion,name and add ress in block letters, and a signed declarat ionthat all rules and regu lationshave been observed. MI stations include cl ub name forcombined cl ub score. Party contacts do not count toward theMI Achievement Award unlessone fact about MI is cornmunicated. Members of the MIWeek aso Party Committee arenot eligible fo r individ ualawards. Decisions of the contest com mittee are fi nal. Results will be final on July 31 andwi ll be mailed to all ent ries.Mailing deadline is Ju ne 30,1979, to : Mark Shaw K8ED, 3810Woodman, Troy MI 48084.ACHIEVEMENT CERTIFICATES

1979 will be the 21st year thathams have had t heir own program to publicize Michigan andits products.Just as fo rthe past

20 yea rs , t he Governor w illaward Ac hievem ent Ce rti f icates to hams wh o take an active part In telling the world ofM i chiga n ' s un lim it ed r esources , opportu nit ies, and advanta ges.

Cert if icates are awarded onthe following basis:

1)A MI ham submits log information and names and addresses (if possible) of 15 or morecontacts made to out-of-state orDX hams with informationregarding MI.

2) An out-of-state ham, Incl uding Canada, submits log lnformation and names and addresses (if possible)of at least 5MI hams who relate facts to himabout MI.

3) A foreign ham, excludingany resident of Canada, submits th e call let ters and name/address plus log information fo rat least 1 MI ham who has toldhim about MI.

4) Only asos made during MIW eek , May 19-26, w i ll beconsidered valid !

All applications for certi ficates must be postmarked byJuly 1 and mailed to GovernorWilliam Mill iken, Lansing MI48902.

For your in formation, th estate bird = robin, f ish = trout,flower = apple blossom, statet ree = wh ite pine, sto ne Petoskey Sto ne.

PERSONALCOMMUNICATIONS ESSAY

COMPETITIONThe Personal Communica

t ions Foundat ion is pleased toannounce its 1979 law st udentessay com petit ion.

Any person who is a stu dentin good standing at an ABAaccredited taw school on February 15, 1979, is eligi ble to participate. Prizes of $500, $250,and $100 are being offered. Inaddit ion, the Foundat ion wi llendeavor to have the w inningessays published in a nat ionalbar journal.

The general subject matter ofthe essay must deal with one ormore of the legal aspects of personal communications by useof amateur radio, Citizens Bandrad io, monitors, and/or radardetectors. With in th is area, suggested topics include, but arenot limited to, constitutionalissues, federal V. state and localregu lation, effects upon property use and values, zoning andtend-use consi derations, andcivil and/or criminal liabili t ies inconnection with equipment operation (exclusive of FCC proceedings).

Essays may be of any length.They must be typed, doublespaced. Footnotes must appearat th e end of the essay and confo rm to the current edit ion of AUniform System of Citation published by Harvard Law ReviewAssociat ion.

All essays must be rece ived

155

at the offices of the PersonalCommunications Foundationon or belore October 1, 1979.Contestants must include, Inaddition to their name, mailingaddress, and telephone number, the name and address oftheir law school. Essays will bereturned only if they are accompanied by a self-addressed,stamped envelope.

All entries will be jUdged by acommittee of the Board ofTrustees of the Foundation.Thedecision of the judges is final ,and all entries will become theproperty 01 the Foundation.Winners will be announced nolater th an November 30, 1979.

The Personal communtcet lons Foundation Is a nonprofitCalifornia corporation dedicated to the collection and dissemInation of legal research and Information concerning personalcommunications. Its Board ofTrustees is composed of lawyers, Judges, and law-schoolprofessors who are licensedamateur radio and/or CitizensBand operators. Inquiries andessays should be addressed toKenneth S. Widelltz, President,Perso na l CommunicationsFo undatio n. 10960 WilshireBoulevard , Suite 1504, LosAngeles , California 90024.Telephone (213}-478-1749.

THE SASQUATCH AWARDSponsored by the Chilliwack

Amateur Radio ClUb, the requirements are as follows: Eyeball contact with one Sasquetcn, radio con tact with twoSasquatch. Canadian and continental US work six amateursIn the Chilliwack District , ofwhom three shall be club members. OX stations work five contacts, of which two shall be clubmembers. Use all bands and all

modes with all contacts madeafter March 1, 1979. The cost Is$1.00 lor VENI, 3 lACs for OX,send log data only, a SLs not requi red . Apply to: ChilliwackAmateu r Radio Club, clo 317Marshall Avenue, Chilliwack.BC, Canada V2P 3J5.

Chilliwack ARC Members:VE7s-AFA, AHN. Ala , AKD,AND, BEN, BHG, BVU, BZY,EWO, EX, FK, NHF, PU, QN, RS,TL, ZI.Local Area Calls (VE7s)AGZ, AVZ, BBV, BDH, BIF, BLB,BPW, CSQ. Cia, CIW, CIX, COO.GM.

JEFFERSON DAVISMONUMENT AWARD

The Pennyroya l Am ateurRadio Society of HopkinsvilleKY will be operatin g portablefrom th e Jefferson Davis Mem·crter Park on June 3, 1979, from0001 to 2359 GMT. This certi fiedsequential award wlll be Issuedto any station presenting written confi rmation of contactwith a PARS member during theQSO period, or any ten Kentucky amateurs during the year.Awards may be obtained bysending $2.00 and the QSLcards to: PARS, PO Box 10n,Hopkinsville KY 42240. The aSLcards will be returned with theaward. Frequencies to be monttorec are as follows: Novtce-,3740, 21140, 28140; General 3970,7270,14310,21370,28610.

NORTHERN LIGHTS AWARDThe Northern lights Award Is

offered by the Northern lightsChapter of the QCWA and isavailable only to members whoare located outs ide the sta te ofAlaska. Make coni acts withth ree (3) members of th e Northern Ughts Chapte r on anymode, any band , and any timeafter November 11, 1975. This is

a one-time free award! Send alist of the three confi rmed contacts, giving the date and timeof the contacts to the secretary:J. W. " Mac" McQueen KL7AVX,1928 East Dimond Blvd., AnChorage AK 99507.

NOVICE WAS NET FORMING !For anyone interested, a

Novice WAS net Is torming al1400 GMT on Salurday mornIngs on 21.125 MHz. Net controlstations are KA8AKL andW08RUH. Check in with QTHand state(s) needed. listen forCSTWASN or NWASN to locatethe net. For more Information,contact Rick Todd KA8AKL,14470 Sasslake Rd., NewburyOH 44065.

FAR SCHOLARSHIPSThe Foundat ion for Ama teu r

Radio, Inc., a nonprofit organization with its headquarters InWashington DC, announces itsintent to award six schOlarships

for th e academic year 1979-80.All amateurs holding a licenseof at least the FCC Genera lClass or ecutvatent can compete for one or more of theawards if they plan to pursue afull-lime course of studiesbeyond high school and are enrolled in or have been acceptedfor enrollment in an accrediteduniversity, college, or technicalschool. The scholarship awardsrange from $250 to $800, withpreference given in some ofthem to residents of variousareas.

Additional information andan application form can be requested by letter or postcard,postmarked prior to June 1,1979, from: FAR Scholarships,8101 Hampden Lane, BethesdaMD 20014.

The Foundation is devotedexclusively to promoting the interest of amateur radio andscrennttc, literary, and eoucatrona! pursuits which advancethe purposes of amateur radio.

does not cause a problem withthe defense 01 our country. Inthis particular case, the CoastGuard Communications Station , Portsmouth VA, was ourinitial radio unit in contact withthe vessel. The Coast Guardhas several teletype and telephone networks set up between the Navy, Air Force,other Coast Guard units, andcivilian organizations in orderto help perform our missions.

During this case, many different military organizationswere used in the attempt 10 getassistance to this vessel. TheNavy assisted with the dtrectlon·finding work, which theysupplied to the rescue aircraft(to get It wi thin 1 mile of vessel),the Air Force helped with aircraft, and t he Coast Guard provided the major coordinationand communications effort. Soyou see, even though It seemedthat only one or two peoplewere trying to get assistanceand rescue these people ,several different groups, In-

handle approximately fi ve hundred separate search and rescue cases each year under thedirect control of the San JuanRCC. I do, however, rememberthe case of the HP3422,because of the part amateurradio played in saving thesepeople's lives. and because Iwas on duty at the time of theincident and recall some ot tneprocedures used.

The initial call for assistancewas copied by an amateur radiooperator in the States, who Inturn notified the Coast Guard.Because time is usually a veryIm portant factor in rescu ecases, the Coast Guard attempts to talk direct ly to th eunit for locating, aSSisting, andother Instruction s, rather th anusing the longer and not-soeff ic ient relay met hod. Although we do have a number ofclub and personal amateurradio stations, In an emergencysi tu ation t he FCC has allowedus to use any frequency withthe distress unit providing it

, .,'. .

THE HP3422

t . ~ lr:.'~ "[ ",)0-" ).) t· ·,·" ." - ~ .. . ~

•

1__1

Dear Mr. Murray,I enjoyed your article In the

January, 1979, edition of 73MagaZine concerni ng th e shipth at sank off Haltt.

I have spent the last 3 yea rswi th t he United States CoastGuard in San Ju an , PuertoRico, where I worked in communications and the RescueCoordination Center (RCC). We

John M. Murray W1BNN4 Kenwood CircleBloomfield CT 06002

... "'} .... , • •"1" ~

."

"-- '- ~ , ,~ ,,- - .• 1 ..~.'-( ..I1'~-.1 ~.. .. .~ .from~ '8

IISCothers would follow suit . . .lor what? People who subscribeto CST get their money's worthin the magazine. II they aresending In the money to buyrepresentation, then I think theyare getting chea ted. Sure, CSTcould be better . . . but it's certainly worth the subscriptionprice, even at the new rate of$18 per year . . . which is abouttime.

II there are any 73 loyalistsreading this. go soak your head./I there are any ARRL loyalis ts,go soak your head and lealle Itunder.-Wayne.

.. ,I I••

L\J"

156

zontal w ire adds so muchcapaci tance di rectly to a noisyground plane th at it is degrad·ing the performance of theheight above ground. A goodrule to follow in designing a" f lattop" horizontal wire is tomake the length about equal tothe height and to place aburied counterpoise of radialwires In the ground underneaththe whole antenna to provide agood eart h ground. This istypical ly the type of antennaused for transmitt ing radionavigati on beaco ns i n the150-kHz to 4QO-kHz range with aheIght and width of 15 to 20meters. While the radiat ion et trcrency is low fortransmilt lng atthese frequenc ies becau se ofth e very long wa velength , thereceiving efficiency can bequ ite high in terms of effectiveheight when used with a rownoi se, high-input ·lmpedanceantenna coupler crrcutt.

An attempt at il lust rat ing theproblem of a long wi re antennaw ith a low height-t o-Iengthrat io (as compared with a shortvertical Wh ip) is shown in Fig. 1.The downward point l ines Indicate the predominant ccupling to the ground plane, andthe dotted lines pointing upward show th e coup ling to thefree-space electric field. In reetworld antennas at low Irequencree, it Is often neces sary tomake a series of tw o-climenstcnat electrolytic tank experiments and plot the fi eldcontou rs by applying dc potent ial between an upper electrodeand the bottom ground planeelect rode conta ini ng the modelantenna. The resu lts are dif·f icul t to ill ustrate in two dimensions. Fig. 1 Is a rough ptetor ia l representation of th esituation , not to any scale, to il·lus trate the idea of effectiveheig ht (which is a purely mathematical concept). The mainpoint we are trying to illustratewith al l th is is that it is important to have t he probe (antenna)

'II II I\ \' " I r- E""ECTlvE HEIGHT, '~"~~T'------L, -----------.;, -~

CAP.CIT.m:f TOE · f 'ELD > 10'

LOOIG l 300M) NO~'IO/<lT.L WLRf un.....

Fig. 1. E-/ield pictorial representa tion o f VLF antenn as .

th en 100 cm (or a t -met ertheoretically perfect antenna)wou ld develop about 150 uV.Th is approximately checks outwith what WWVB says their6O-kHz signal level should be atmy locat ion In Ohio. The poi ntto make here Is that 3meters upand vertical In the clear is better than 300 meters long overthe bush.

There are a multi tu de o fother problems connected withoperating vertical wh ip ante nnas, but they can be solved. Infac t, these types of verticalantennas are now being used inmil itary and mari ne VL Fm onitor systems f or radi onavi gation thro ughout t heworld. The biggest sing le problem with all VLF E·field ante nnas is provi ding a rea ll y goodground system and relat ivelylow capacitance to ground att he antenna terminal. In VLFrec eption, we are t ry ing tom ea sure the potentia l dtt.terence between what we th inkis our local ground system andan ideal probe sticking out Intofree space. A long horizontalwire does not solve t he problem.

Another way of measuringantenna performance is 10compare the actual height (orle ngth) with the effect i veheight. Th us th e 2 lA-meter vertical has an efficiency of (60cm/(2.75 x 100 cm)}(100) = 22%,and the 300-meter longwire hasan efficiency of (20 cmJ(JOO x100 Cm))(100) = 0.07% . assuming all our measurements arecorrect . Even If we are off by afactor of ten, the short verticalantenna is still better !

St il i another way of lookingat the problem of a aoo-rneterlongwire is to consider theheight above ground. In th eW3QVZ case, it was 60 fee l , ora bout 20 meters , off t heground. The lead-in from thislongwire may be a more effect i ve an t enn a Ihan t he 300meters of tongwire. The hori-

U P"",, r. Nct TOGROIJ NO '~O'

supported g rants and contracts.

I enjoy reading 73 very much,although sometimes t he qual ity of the technical work is nottoo good. A case in point wa s arecent art icle regarding VLFsignal recept ion . In hi s articleabout a simple VLF converter(73 MagaZine, January, 1979),W3QVZ mentioned the use of a1000-foot (300-meter) longwi refo r WWVB, and only obtainingan estimated 20 uV at the inputterminal. In t heory, t he 13-kWerp from WWVB at 60 kHz willdevelop a fie ld inten sity ofabo ut 100 uV/m eter at W3QVZ 'sQTH In Woodbine, Maryl and(see NBS Special Publicat ion/;432). Now, does this tell ust hat a 300·met er longwi restrung out over t he landscapeonly has an effective height ofabout 20/100 meters or only 20em? Thi s, in fact, might be approxi mately true consideri ngthe input attenuat ion involvedand th e inherent difficulty ofm a k i ng acc u ra te si g n a l·strength est imates with a longwire antenna at VLF.

A longwire antenna systemis just not the way to go at VLF.The antenna looks more like anextended groundwire , wit hmuch more capaci tance to th evariable noi sy ground currentsfl ow ing in the earth than effect ive capac itance to the electricfie ld above. Thus, th e w ire ispicking up oroers-ot-mac nnudemore ground noise than Signal.W3QVZ's comment that the antenna leaves much to be desired , even when used with atu ned cncuu. is very t rue.

There is a much better approach to thi s problem of VLFsignal reception. A a-meter-orso ve r t ical wh i p ante nn amounted up as high as possibleand reasonably in the clear,with low capacitance to ground(but with a very good groundsystem at t he receiver andunderneath the antenna), canprovide an effective height of20 to 60 em. In Ohio, I canreceive WWVB 60 kHz with anestimated 150 uV/meter fi eld Intensity as developed on a 2 1A_meter sta ndard CB-ty pe vertical whip. In order to operate avertical, it is usually necessaryto have a unity-vol tage-gain ,high-Input-impedance circui t atthe antenna base.

In my case, a preampl ifier related to t hat presented in 73M ag aZi ne (May, 1978, pp .146·153), has a measured Inputcapacitance of 85 pF w ith noantenna connected. The 21A·meter vertical has a capaci·ranee of about 100 pF. The effect ive height is very roughly1001(85 + 100) meters, or about60 em . I actually estimateabout 90 uV for WWVB at theante nna te rmina l. If 90 uV Isdeveloped on an antenna withan effect ive height of 60 cm,

VLF RECEPTION1 1

c l udl ng amateur rad iooperators, played an importantpart in the case.

I will not go in to any moredeta ils concerni ng this Incident , becau se my memory andthe facts might tend to differwith each other. However, fo ryour information, the peoplewere picked up by a paSSingmerchant vessel diverted to thescene to assist.

James C. Norton WD8EAICleveland OH

I NOTHING PERSONAL II like you r magaz ine very

much. It is probably the bestham publication on the markettoday! BUT ..• it's not worth$15 a year to me. The last time Isubscribed, I got a three-veersubscription for that amount .

I know what you are going tosay. You'r e go ing to tell me howIn flat ion has made the price goup and all that Jazz. Well , thatmay be. I can't , however. keeppaying what I believe to be anoutrageous price. I'm sorry, OM,nothing personal.

Clay Welsh W1 PISpringfie ld MA

I very much appreciated yourfi ne editorial on Sam Harris. Ihad the W8FKC call from about1948 to 1968 and knew Samwhen he was at Brush Development in Cleveland and l ived InBurton, Ohio. I used to workhim on 144 and 220 from myformer homes In Hudson andChagrin Fall s, Ohio, when th ebands were du ll. 1bui lt severalparam ps based on his designsand used them for moont rac king the very first series ofRanger moon probes with a 28'dish. In fact . the parampdesigns were the basis for mybeing interviewed for a posi tionat Arecibo by Dr. Drake andothers up at Cornel l back Inabout 1964-65. I didn 't get thejob, wh ich is just as well ,because I did not reall y haveenough expertise at the time.However, I was also on a year'sleave of absence from au herein 1966-67 with a position asstation manager of the mm.wave dish supported by NRAOout at Kitt Peak AZ. I also spenta summer at Greenbank WV. Allthis was due in part to my inte rest and ability in VH Fmicrowaves as a result o f SamHarris ' work on row-norse amplifiers, etc., so I feel Sam hadsome influence over my career.I have graduated to the de-to5OO·kHz range now, teachingaudio methods, supervis ing EEsenior labs, and doing contractresearch on var ious NASA-,Signal Corps-, USCG-, and FAA·

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I MEXICAN OPERATION IFirst, I thought I'd let you

know how much I enjoy yourmagazine and how much l appreciate the fact that I can buy asubscription to it in Mexico forthe same price as paid by stateside subscribers.

I thought some of your readers might be interested in knowing that there is now a possibility that licenses may be issuedto visitors to Mexico. Untilrecen tly, only Mexican citizenswere permitted to hold amateurlicenses, and Mexico has no

P.S. If you change IC X20from a7400 to 74S00 and use 2 unusedgates of it for th is modif icat ion,you add nothing to the partscount and gain an Increase indrive power from 15 pF at 400Ohms to 150 pF at 93 Ohms.

GENERATOR IMPROVEMENT

from pin 10 on 0711 to D701,allowing 0713to funct ion properly above 148.000 MHz. Thisquick f ix allows full transmitand receive functions from142.000 to 149.995 MH z, inelud ing memory. (Would youbelieve 1600 channels?!)

Pe rhaps this f s-mrnu temodif icat ion wi ll make the FT227R at t rac tlve to MARSmembers who were considerIng other alternatives.

Mike Zaruba N8AIFNorth Ridgeville OH

First off, thanks to Louis Hutton K7YU for the translat ionand Sr. Mario Scarpelli 16THBfor his design , "The Itali an FreqGenerator" (January, 1979). Iwould like to suggest an improvement to prevent a "race"condi tion. Separate pin 13of ICX5 and add an R-S flip-flop asshown in Fig. 2. Thi s rnoottlcation forces the "load" pul se tobe equal to one half of theperiod of t he generated signal ,at least 50 ns at 10 MHz. Ten different 74192s were tried in theoriginal circuit, with poor reosutts above 5 MHz. Wi th themodified circuit, the outputsignal is not "off 1 or 2 Hz ataudio" and " several hundredHz at MHz range," but is exactly"thumbwheel switch settings"plus "one" times the " multi p li er switch" plus or minus the" reference oscillator error."

I had to add an additional 5pF to the 33-pF and 1oo·pF capacitors to tune down to 3.400MHz and 1.000 MHz respectively . Again, thanks for a gooddesign , as I now have a signalgenerator which t unes from0.993 Hz to 10.000 MHz with ± 1ppm accuracy.

Clancy Arnold W9AFVLawrence IN

Memorizer to include someMARS coverage (73, March,1979).

Following his instruc t ions, Iremoved the red wi re from pin 3and the blue wire from pin 7 on0712 (MC14028B), located onthe PLL cont rol board (PB1773A), and so ldered them to anearby ground. I found that thedisp lay became functio nalfrom 142.000 MHz to 149.995MHz, as he indicated it wou ld.The un it would transmit out-ofband below 144.000 MHz, butnot above 147.995 MHz-whichis required to work our localArmy MARS repeater (148.01 in ,143.99 out).

After studying the diagramon page 19 of the owner'smanual , I noted that although0712 con trols t he low-endcutoff, Q711 (MC14081B) controls the high-end cutoff whichmust be overridden in order totransmit above 147.995 MHz.

The " fi x" is very simple. Allthat is required Is to cut a1I16-inch gap in the foil leading

227 MOD'--- IAs a member of Army MARS,

I am grateful to KH6JMU for hiswork on expanding the frequency range of the Yaesu FT-227R

used with the LM318 operate asan atlenuator for low-levelsignals. This decreases thesig nal even before it isamplified. It is not commonpractice to use operationalamplifier methods at the veryfi rst input stage of a communications receiver. The sig·nal-to-notse ratio is a lwaysdecreased whenever an attenuat ion network is insertedbetween the source and theamplifier. A belter input stageamplifier is a JFET MPF102 or2N5457, each of which is muchless susceptible to cross-modulation problems.

Good DX-hunting on VLF!R. W. Burhans

Athens OH

I

out in the electric fie ld as highas possible to minimize paral lelcapaci tance and coup ling tothe local ground plane. In amateur work with VLF antennas,we should stop t hink ing aboutthe way antennas work at 80meters and up. Virtua ll y all VLFEdle ld antennas are muchshorter than a quarter wavelength . We should consider theantenna as more like placing ahigh-impedance probe at theend of a cable connected to anoscilloscope, wit h the high·Zc ircui try at the antenna designed to mi nimize undesirednoi se pickup. (H·field loo pantennas are a whole differentstory at VLF, suitable for someother author to present.)

Another aspect of W3QVZ'sart icle on the VLF converter isthe trouble experienced withcross-modulation . The use ofan LM318 bipolar IC as a wideband inpu t stage amplifier isprone to this problem. The inpu t circuit, low-pass filter, andthe input 10k summing resistor

158

thing he wrote to the effect thatthere is no place in a hammagazine for levity. And thatwas why Wayne Green was nolonger the editor. The next tenissues were passed on to myham shipmates without beingopened . Naturally, I never reonewed that subscription.

At the same t ime, I let mymembersh ip in the ARRL lapse,mainly because of incentivel icensing. I didn 't mind workingharder for something more, butit really ticked me off to losewhat I already had.

In 1966, I became a submarine sailor. No chance for amateur radio t here, but each timemy license expired, I renewed it ,thinking that one day I would beon the air again . In the meantime, I had tours on four submarines, in Viet Nam, and inTaiwan. Fina lly, in 1976, I reti redfrom the Navy. During my career, I had been the leading Radioman In fi ve different radioshacks, and only a Navy Radioman can tell you what thatmeans to a Radioman. I hadalso managed to acquire a FirstClass Radiotelegraph license,and shortly after retiring , I received my Merchant MarineRadio Officer's license andz-caro. I did not, however, at·tempt to upgrade my amateurlicense, mostly because of alack of interest.

Shortly after I retired, I received your offer of a three-yearsubscription at a special price,and I went for it. The fi rst coupleof issues got me thinking again ,and over the past couple ofyears I have been doing quite abit of soul-searching and discussing amateur communfca.trona with some of the amateursI know.

1 have now reached the conclusion that after twenty yearsas a professional radio communicator, I've had it. Amateurstoday are the same as they werewhen I started. If you manage toget in contact with one of them,either they are looking for asmany contacts as possible or, ifthey are interested in cornmun lcatlng (rag chewing) ,which is my bag, it seems l ikeall they can talk about is whatgear they are using. The factthat I can receive them at alltells me that they have anantenna, a t ransmitt er, andsome sort of electricity hookedup to it. If I ask about theweather, they don't know because they haven't been outside of the ham shack for thepast week. If I ask about theliberty where they are, such asthe night spots, local attractions, etc., the contact eitherfades, or the other guy comeson like the caretaker at the localmonastery.

Well , now I have a job as alocomotive engineer. (That's theguy who runs t he trarn.j I have arad io on my engine but I

HAD IT

National Center for Deaf-BlindYouths and Adults by our staffand clients, and elsewhere.More than four years have goneby since the original commit ment was made, and NASA isstili working on the project.(Since the original agreement, Ihave served as a technical consultant to NASA.)

1am quite disappointed thatreports such as those occurring in Microwave SystemsNews and 73 shou ld give somuch publicity to a devicewhich is merely an artist's conceptual iza tion, when an ac tualsystem specifically designedto make use of a soph isticatedtwo-way wrist radio and cepebre of satisfying many of t hesurvival and signaling needs ofseverely handicapped people ispresently being prototyped .Moreover, t he prototype work isbased on my designs oevetoped here at the Helen KellerNational Center. In light of theabove, credit for the initialdevelopment of a practical twoway wrist communication svstem should be given to theHelen Keller National Centerfor Deaf-B lind Youths andAdults.

Frederick M. Kruger, Ph.D.K2LDC

Director 01 ResearchHelen Keller National Center

Sands Point NY

I enlisted In the Navy in 1956,and ended up as a Radioman. In1962, while on my one and onlytour of shore duty, I was stat ioned with several amateurs,and a friend of mine had quite acollection of back issues of COand OST. I spent a lot of timereading and enjoying these oldmagazines, especia lly "NeverSay Die" and " Scratchi." So, Iwent and got a General classl icense.

I spent many enjoyable hoursworking 20 CW from the smallham shack where I had the misfortune to be stationed. I endedup with a big bunch of aSLcards (all of which were acknowledged), and then went to aship home-ported in a countrywithout reciprocal privileges.

About this time, the subscript ion to CQ I had ordered finallycaught up to me. Righ t away Iopened it to W2NSD, only tofi nd ou t it wasn' t there; noScratchi, either. Then I saw aneditorial by the new editor, andthe part that sticks in my memory after 15 years was some-

ThanKs for providing us withthe proper bacKground on theWrist-Com idea. Best of lUCKwith the project, Fred, and besure to Keep us up to date onyour progress .-Jeff DeTrayWBBBTH/1 , Assistant Publisher.

1 1

WRIST·COM1 1

5000 times the amount of leakage allowed from microwaveovens, I'm sure I'm being subjected to a helluva lot morethan that!

When you start your Churchof the Pure Body, I think I'd beready to become a convert. I'dthen be able to protest the vtotation of my religious principlesby all those rf sources acrossthe river. Do you think we couldget them to insta ll a copperscreen rI fence along the top ofour Pali sades? As you say, ifenough people protest, theycan raise hell with the system. Idon 't want to move-I've livedhere longer than the system hasbeen imposing its rf on me. Andthe saddest part of all is that somuch of the rf Is being used tocarry the pure unadulteratedgarbage that is the rule ratherthan the exception on the TVchannels these days.

Allen L Barnett WB20PMJersey City NJ

Our January, 1979, issue contained a brief mention of a project to develop a "wrist radio"communications system. Sincethen, we've received an especially informative letter onthe recent history of this concept. An excerpt from the letterappears below.

The concl usion one drawsfrom your co mments is thatNASA was the first to conceptualize and develop a functioning two-way wrist radio. I feelthat it would be more to youradvantage to provide ful lcoverage regard ing the actualfacts in t he development of atwo-way wrist rad io communication system beyond t he repre s e nt at io n s prov ided byChester Gould.

In late 1972 and into 1973, Ideveloped a concept and then abreadboard working model of asoph isticated two-way wris tworn communications systemfor deaf-bl ind persons which included dig ital en-board control ,outputting of a number of dlf·terent types of messages, andMorse code capability. It alsoprovided for signaling back to abase station in cases of an emergency. We call it the " Wrist Com. " For one vers ion of theWrist-Com wireless signalingsystem, t he " Ins t i t u t io na lwrist-com," we required assistance In micromin iat ur izat ion,and, because of their reputetron and wi lli ngness to assist,we entered into an agreementwi th the Techno logy Uti lizationOffice of NASA wh ich wou ld result in their producing for us asystem which was based uponou r design specificat ions andbreadboard, and which wouldbe usable at the Helen Keller

PURE BODIES

In your editorial In t heNovember, 1978, issue of 73,you express concern about theeffects of radar rad iation abosorbed as one drives down thehighways of New Hampshi re.

I submit that your concern isextremely parochial. You getzapped once every twenty milesor so. Consider the plight ofthose of us living on the heightsjust across the Hudson from theBig Apple-as one looks at theEmpire State Building, one seesnot only the TV antennas withtheir tremendous erp, but alsoall manner of dishes, yagis, corner reflectors, and horns aimedin our di rection. And that Is justa start-many other bui ld ingsfrom the Battery to uptown arealso squ irting a potpou rri of rtour way. Of course, not all ofthis rad iat ion is in the microwave reg ion, but a good deal ofit is-and many of those UHFTV channels are getting migh tyclose-and running lots ofWalts.

I have no idea how muchmicrowave energy I'm bei ngsubjected to, but if, as youclai m, the highway dosage is

reciprocal agreements in force;however, due to a change in theregulat ions covering amateuroperation in Mexico, permi tsmay be Issued up to a term of 6months to persons visiting Mexico.

I would suggest that anyoneinterested in obtaining such apermit submit a request to:Secretaria de ComunicacionesY Tran sport es, Subd i reccionGeneral de Permisos Y Asuntoslntemacronates. Depto. de Frequenctaa Radioelectricas, ottcina de Ucenclas, Torre Centralde r ereccm untcectones, Ave.Nino Perdido Y Cumbres deAculzingo, Mexico 12, D.F.,Mexico.

I suggest that a photocopy ofthe current li cense be inc luded,as well as a copy of the Mexicantourist card (obtainable at theairline or travel agency offices)and a statement that "In accordance with Art icle 19, subsection b, of title 3, Regulations toInstall and Operate AmateurRadio Stations as published inthe Diario Oficial of Ju ly 4,1977," you are requesting consideration of your request to begranted a temporary permit tooperate. I would also suggestthat a list of places to be visited,the approximate dates, and theequipment to be broug ht intothe country be sent at the samet ime.

I cannot guarantee that th iswi ll get the applicant a permit,but at least such a possibilityexists, for the first time.

Kenneth M. Price XEHISlrapuato, Mexico

1 1

159

couldn't tell you what frequencyit 's on. I suspect It's around 160MHz, on FM, but if it isn't, I'mno t concerned. As a matter offact, I'm not really all that concerned about whether it worksor not. And that's the limit of mytwo-way communications.

If, as you fear, WAAe takesaway the amateur frequenc ies,I'm no t going to mourn them. If Ihaven't made it clear why not,I'l l spe ll it out here: incentiveli cens ing.Once it went in, I wen tout and have stayed out.

Well, Wayne, 1 know this isthe type of letter you don't liketo receive, but It Is how I fee l. Ifyou want to cancel my subscript ion now, that's okay. If not, I'llkeep reading the magazines asthey come until it runs out, but Iwon' t be renewing it.

Jack McCord KA 4EXDArlington VA

I OUT OF SIGHT

I have just returned from an

AAAL convention/hamfest,where I attended an AAMA(Amateur Radio Manufacturer'sAssociation) meeting at whichmost of the AARL board ofdirectors also sat in. SinceAAMA allows manufacturers,dealers, reps, and publishers tobe members, the ARRL wasclassified as a publisher andallowed to participate in themeeting. The meeting startedwith just a handful of manutacturers and dealers and thegroup of AARL di rectors. Thefirst words that came from theARMA meeting moderator were ,"It has been said that AAMA isanli-ARAL-this is not so."With that, you could hear a sighof relief in the form of a wheezefrom the elderly AAAl boardmembers, The main topic of themeeting was the 220 band andwhat to do with it. They alsotalked about the 10 meter amplifier ban.

As some of you know, theAAAl has asked the FCC toallow the use of 220 for the

Novice for phone, hoping tobring more users to the band.ARMA wants to start an all-newentry level exam for 220, with acode recognit ion test (3 to 5wpm) and a Novice-type tecbntcal exam. The testing for thenew class would be much likethe Novice test, only the oldterm "Novice" would not beused, After all, who wants to bea novice at anything? The term"Communicator" will not beused either. They said that"communicator" sounds toomuch like CB and that the highemotional fee ling of hamsabout that word would spelldoom for the ARMA plan . Sothey have to come up with aname that all will go for.

ARMA then disclosed its planof attack. It called for $30,000 togo for a lobbyist to push a $1.5million FCC grantlfunding poolfor the "new class" license.AAMA said that the FCC hadtold them that if the money wereappropriated, the new classcould be on the air by midsummer of '79. With that came the

big question-Will the ARALback AAMA and their plan?Si lence fell over the room.AAMA members were on theedge of their chairs, and all youcould hear were the tapp ing oftoes, the count ing of fingers,and the scratching of headscoming from the AAAL leaders.Then came the big answer:We ll, may be, but o ff th erecord - we don't wan t to makeanyone in the "fraterni ty" madat us and lose members.

It seemed to me that theARRl di rectors were lookinga fter t hemselves as bo ardmembers, but as elected representatives they were not do ingtheir job in any way. Even thenext day, at the AARL membersh ip meeting, the ARMA planwas not brought to li ght to themembership. If a phrase couldbe used to express the ARALfeelings on any issue that mighthave an impact on membership,it's "out of sight, out of mind,"James W. Menelee,Jr. WA4KKY

Jacksonville FL

Reprimed from the Federa l Register.

_""EUI aAIltO WIVKf

I ...m;n. ' ;n, • .--a...... e.- 11 o,.a..-.aa.... , 'rlYll-&• •, _ ....

AGENCY: Ff'deral CornmunlcallolL'

(d) It a license \.'IlI.Howed to expi re,applicatton for renewal may be m&dedurIng a per10d of grace of five yeartluter the exptrll.tlon ds.te. D urinlf t h isflve year period of flTSCe. an exptred 11·cense Is not vaUd. A license reneweddurl n lf the irace period wtll be da tedcurrently Il1l d wlll not be backdated tothe date of Its exptratlon. AppltcaUonfor renewer enen be submrtted on FCCForm 610 and shaJl be aecom pented byt h e appllca.nt·s eltplred ueeree.

an extension of t h is period beyond theequlvaJent of one a.ddltlonal ltcenseterm Is unwarranted.

5. The rule amendment wlll r educeCommission workload In two ways: (IlThe Commission wlll receive fewer requests l or walvers, each of which nowrequ ire individual lI.ttention Il1ld handllng; Il1ld ( 2l the Commission win arl·mlntster l ewer seeond examinations toex-licensees who fa.lled to renew t h eirlt~nseawithin the "grace period" ,

6. Aut horit y for these amendmen tsIs contained In Sections 4<ll a.nd 303 ofthe Communications Act of 1934, aslUIlende-d. The Cornm1aslon flnda. thatfor good U U&e the prior notice andpublic procedure provlstons of the Ad·mlnlstrative Procedure Act 15 U.s.C.553l are unnece.ssary because t h e Com·m!.salon beuevee that there would beno obJed lon to the reuer from prevtously Imposed r eatrlcttons . Ear!J' &dODtlon would simplify application flltnarequirements. accelerate the.peed fo rprocessing applications, Illld reducedelay In ellmlnatlnlf r estrictloIUl.

1. 11 .. ordernf, That effective March16, 1979, Part 9'1 of t he Commlsston·.ruree Illld regulatloIUI Is lllJlended salet forth below.(8eca. <l, 303, 48 Btat., .. amendoed, 1088,lOS:/; <41 U.s.C. IH, 3G3»

F>:oJ:llAt. CO_UJlICnIOJlSCOIIDII8lIIOfl,

W l l.LIAM TRICA.U CO.Sn:reta'll.

Part 91 of Chll.pter I of Title 47 oft h e Code of hderal Relru1attona IIamended lUI followa:

1. In 191.13 pa.ragTllph (dl Is revisedto rearl lIS follows:

111.13 fto,ne lor modification of 0....._to. n....n .

•••••

SUPPLEMENTARY INFORMATION;

Adopted; February 28, 1919.

Relea.sed; Mareh 5. 1979.

Order. In the Mat ter of Amendmentof Part 97 to extend grace perlod forrenewaJ of an eltpired Amll.teur RadioService opt'rator license.

1. The purpose of thb ONier Is toamend Part 91 of the Commission',rules to lenlflhen t he "grace" periodtor renewal of an expired amateurradio operator ltcense. section 97.13(dlof the Conunlsslon's rules now statesthat, " If a llcense Is aJlowed to expire,lI.ppllcatlon for renewal IfllI.Y be mlLdedurlnlf lI. perIod of irace of one yearafter the expiration date. During- thisone year perIod of Ill"ace. Illl expired 11·cense Is not valid."

2. Applicants who allow the one yearperiod of grace to expire must nonnalII' be reexamined to demonstrate aiaintheir Quallflcations to be IUl1lI.teurradIo operators. The Commlsalon,however, receives m.ny requests forwetvere of §97.13(d) from appllcll1lts.who, for vat-loWl reasons, neve unll:·nowlngly permitted their licenses tolaPSe beyond the one year period of.-.

FOR FURTHER INFORMATIONCONTACT:

Mr, Stephen J. Frll1lcls, PrIvateRarllO Bur...u. (202---ll31-1I75).

3. In considering whether or not togrll1lt waLvers of §91.13(dl, the Com_mtsstcn evaluates the clrcwnslancessurrounding the non· renewal of theselteenses. The rule is walved tn caseswhen (1) etrcumstances beyond the II·censee'e control, such lIS a physical etelI.blllty or a death of a erose familymember prevent the llcensee frommlnlf a timely lI.ppllcatlon and (2) theper10d since exptratton of the "iTaceper1od" hll.ll been of brief duration.When • waiver Is grll1lted. the commission presumes the lI.ppllcll1lt Is stillfully QuaJlfled to operate Illl amateu rstation,

4, tt Is evident from expt'rlencegained In processlIllf several hundredrequests for waivers In recent ye.....that the overwhelming mtLjority of requests result In weivere, For t h ist'<!ason, the Cornml...lon Is amending§91.13(dl to change the period ofgrace from One to flve years. The Com·mlsalon concludes that the flve·yearper10d Is one In whtch It Is reasonableto presume that the licensee wtllremain fully qUalltled. While there Isno clear demtLrC&tlon, we believe that

E1''FECTIVE DATE: March 16. 1919.

ADDRESSES: Ft-deral Communlca·tlons Cornm1aston. WB.lIh~n. D.C.2<1554..

Ext.nding Grac. P.riod for R.n.walof o n f..pl.ed Amot.u. Rod io S.....ic. Ope.otor L1cen,.

AGENCY: Ft>deral Communlca.tionsCommlslilon.

ACTION: Order (Rulemaklng).

SUMMARY: The Amateu r RarlloServices rules are being amended toextend the grace per10d for renewal ofIl1l expired amateur radio license fromone year to five years. At present, peesons who do not renew withIn One yearof the expiration of thelr ucense muatbe retested In telegraphy Illld rtLdlotheory. Extension of the grace periodwlll reduce the number ot ee-examtnetlons end/or requests for waiver of there·exlUnination requirement,

PART 97-AMATf UR RADIO SERVICE

the Amll.teur Radio service shall bemade on the FCC Form 610-B. Eachappllctltion for any other amateu rradio Iieen&e shall be made On theFCC Form 610.

(b) One appllcation and 0.11 papt'fStncorporated therein Il1ld made a partthereof shaJl be submitted for eachamateur station Ilcense. If the appllca110n Ls only for a stalion lieen&e. itsha.ll be tiled directly ..·ilh t h e Commlsslon's Gettysburg, Penflllyll'aniaoffice. It the lLJIplication abo containsan lLJIplicalion for ll1ly class of ama·teur opt'ralor lleelUl~, it shall be filedIn accordance with the prm'llIlons of197.11.

(c) Each appllcant in the Safetr IllldSpecial Radio services (I) for modiCl·canon of a station license involving.si te change or a sUbstanllallncrease Intower height or (%) for a license for anell, stalion must. before commencinlfconslructlon. SUpply the envlronmen·tal information, where required, andmusl follow the procedure prescribedby Subpart I of Part I of this ChapterIn 1.13UI through 1.1319) unless Com.mi....lon acllon authoridng such con·slruction would be a minor action withthe m"anlng of Subpart I of Part I .

FCC

I !rI. I I Appl i<'a l;n" rnc ,Ial;" " Ii....., .....

la) Each application for a club ormili tarr recreation stll.tion [kense in

Edito,iol Amendment Conce""""Applicotion for Stotion lIcen, e

AG EN CY: Fed~ral CommunicationsComrnlMion,

ACnON: Correetlon of fina.l rule,

SUMMARY: FCC amends rule to OOr·reet erro r in paralfraph sequence.EFFECTIVE DATE: March 13, 1979,

ADDRESSES: Federal Commun!caucne Commlsslon, Washington, D .C.20554.

FOR FURTHER INFORMATIONCONTACT:

tipton Gutherr. Officc of GeneralCounsel . 202-632-644t,

I n the matter of editorial amend·ment ot § 91.41 Rules of Practlee Il1ldProcedure; Order.

Adopled: Ft>bruary 26. 1919

~Ieased; Mar<: h 2. 19711.

1. To correct tnecnststenct... bel1..·.....nt he amendatorr hmguag.. and tn .. parlI.graphlng of the rule changes In twoorde r. &mending ;97.41 01 the Rules.we are ISSUing this order sp""ifrlngt h e cor,..,.,t text of that section. TheoNiers In question are FCC 78-76, 43f'R 7323, P~bruary 22, 1918. and FCC78-210.43 FR 15331. April 12. 1918.

2, Authority tor thb action is eontain~d In seeeees 4(1) and 303(rl ofthe Communications Act of 1934, asamende-d . 41 U,S.G. IS4t!) and 303(r),and § 0.2611d) of th~ Rules. 41 CFRO.26Hd), Bef'ause Ihe eorrt'Ction is edi·torial In natur~. oomplian",p with theprior notice and effeetlve da~ pro,'i·sions of 5 U.S.C. 553 Is unn...,essary.

3. Acco rdingly, It Is ordered, ",fit'<'·

U\"l' March 13. 1919, That §91.41 iscorreded to read as set forth below.

<Sect, ~, )03••8 St&l .. as &mende<1 10661082, (7 U.S-C, 1~4 , 303.1

R. O . WCHTWARDT,EJ:n::uti t><' Di"cfor.

In part 97 a t Chapter I of Title 41 ofthe Code of Ft>deral R",gulalions.197.41 is ecrrected to read as folio,".:

PAil 97-AMAnUR llAOt O SBYICE

160

Commission.

AC710N: T f'rm ln . tlo n or mlf' m.lr.ln&"p roceed In&".

S UMMARY; The Commission d ..cldo'ato defe r action On t he " Comm u n icat o rCl..." . nd "d u . 1 ladd..r " am.tf'ur II·censlnl. A pettucn tor " I lfe ti m e" tssuence of the Amateur Extra ct... li·eense Is d ..nled: .nd actio n Is d<'fe rredo n chanllnl the p~ure for meu·urIrlc" IUn&teur t ransmlt ,"",r PO..er.Ef'F"£CTIVE DATE: Not . p p llcab le.

ADDRESSES: JI'fodt'ral Communk'a·tiona Commission. W u h ln cJo n . D ,C,205!>4.

FOR FURTHER INFOR M ATIO NCONTACI":

James E. McN.lly. Jr.• ""nonalRadio [)jylalon. PI1val.o' RadioBureau. 12021 S32-111!>.

TRIaD Ruo&'T.llfll OaDD_lPaOCEalI"G TUIlII I".lTal I

AdopU'd: Warch IS. 111711.

Released: March 14. 1ll'79.

In the mat,"",r of am...r><lnwn t of Part97 of the Commlaalon 'l rul.... eeneerninI operator c1-. prtrlle'Cn. and reqw....m ...ntl in th... AmaLe'ur Rad ioservsee. Doc.tet No . 20282. RM-IOlll.1343. 14!>4. use. lstll. 15:21 , 15211. 1!>3!>.1568. 1572. 1502, 11115. 11l2i. 1633. 11l!>l.1724.1793.1505, IS4I . 11 20. IH7. IIt'7Il.11ll1. 2030. 2043 , 2053. 21411. 2150. 21112.216fl. 2211. 2211. 22!>fl . 2284. 2449.

1. On Deffmbe'r 11l. 1ll'l4. the Corn·mls&lon la::aued • Nolit:e of Pro~Rul... Ma.lr.inc in the aeeve-eeuneem.tu,r ..h lch ..u published In t h o:F'1:DEIII.lL RBGI!JTDI on Dfonombe'r 20.1974. (39 FR U042l. The major p roposed rule chlnl.... contained In thexeuee ......... the follo" 'lna-;

Ia) Crnllon of • 'd u al laddo'r' l lco:'MInll: structu ....;

(b l Creation o f • " Comm u n icat o rC1.asIl" 1Ict'I1Se' hul... no te'1"lraphyprh ·IlO:-lI:e. or .. xamlnltlon noqulr..m ..nt ;

(e) l:stablillhm..nt o f n ..w pol..... rlimJ ts b&IIl"d on tran.sm ll tH p".1r. e n " '"lope po...'.. r output;

fd) N e ...' ....trlctlons o n lk",l1M'1 01).tained by mealll of volunlet'r·admlnl. ·tered mail .. xamln.tlolll:

ff') Issu . nce of n fl' tl m e Amalf'urExt ra C I... operator licellll'S; Ind.

ttl Modi fica tion o f the fr..qu('ncil'land modPl .""lIable to certaln 1lct'JL';.ef l..."".

2. Bf'C. u.... or M'VI'.... manpo...... r andUm .. r ..~l rirtions brought about by theh UII:1' tiu rlle In Cltl1~ns Band Rad io.s..nrlrl' a l'pli('ltl ons si m ... 1974. " ...'.1,.. "1' 'lnlb le 10 und"rl a ke t h .. pr"para·li o ,> " r a .<" "",,·ph,'n.<h'p R ,·port and, lrdl'r al1.",''''''~ .. Ii o r I h e I,;..<IUI'SraJ:;. 1 1111"'" S (;{ ;~". W e did. ho"·e'·,,, .r.-l ..~ " f " "'1 R pl'C'rt and O rd.. r onJu n .. 15. 1976 141 FR 25013 ) "hi('ham" ndl'd t h l' rulf'S t o renect t h .. fol·10\L inl c b a n les:III Excep( in """"" " ·h....... t h .. ..ppll.

cant ,,·u physleally d isll b ll'd flUIdwh.... .. til.. Commlsllion . ·ould eeledth.. volu nl.....r .. xaminf'rl. yoluntE'f'r·ad_mJn llll...red namlnaUons eould only bf'Ih..n to applicants for Ihe No' ioeC1IlA uceree;

Ib) Th... Conditional ctllSl li ......nHand th... "cxmdl l lonaJ" lC ) limitat ionon the Tf'C h nktan CIaa U llR . '.......to bf' ...Um.inated upon ....n -al. Lict'ns-..... holdina t he Condi lional Class \l.eenae wl' re to bf' Issued .. regular O .. n·era! CIa-. license. and holde~ o f theT echnJdan (Cl C1IlA license ...·..re to eebIlued l"f'llU1ar Tf'Chnki&n Class Ii·«-ter The 175 m ile' distancf' e licib ilitymura ror the v..neral (form..r lyCondilional l ctl.Sl Uof'nse . ·u I'Um l·n..te'd;

ld l Appll('1lifl ts for any c1.asll of &milte'Ul' lk'ellR m w;t ta.Ir.... E1emt'tlt -r.·o ;

1.. 1 1I01dl'~ o r th... T e'Chn i<',a n ClassIlco:'nae .....r .. Ih·..n all No\ ic<' prWI·leRes; and.

I II Th.. n\llJI lmum PO'rmw 'b l.. Inputpoa'f'r fo r No' ·....... ...'.... ilK"~ to 250,,·a l ts.

3. S u lJo;('qu..nuv. on Apnl 6. 19'18. ........I~ a Sf'cond Rt'l)Urt IUId O rut'r14.3 FR 1$324) " 'h ieh I l\"e h oldl'l"$ ofth.. Te'Chniclan C1.asIl 1iCt'1lS<' full o Pe'r..Un&" prlvll"ll'S abo,·.. 50 MHz. and... hleh ch..nrtd th.. term or l h .. Novk'eCl.... Uce /lSf' from 2 Yl'ars. n o n · ...n e"··abl.. 10 S y........ rene,,·abl...

4. The purpD8e' of this Third R"POrtand Ord... Ia to dispoa.. o f th.. ft>m..in ·Ifill' unrt"lOlvf'd mallei'll.

5. Fll'Ilt ..... h..ve decidf'd to take noacUon ..t thla time on the 'd u al ladd.. r·lleelllln&" atructUrt proposed In t heNotice. or on th.. <Teation of a ··Com·

munkator CIIlI>II " U nse havlnl nO t .. •1('llraphy prlvU.. II: or requlr..m ..n ta.W e r1 rmly eeneve In the principle. ar·Uculatt.<! In t h .. Nolle... that In IUIY lJ·cenlinlll Iyalem thne IhOllld bt' a 101lj·cal r.. l..tlonlhlp between thl' q uallflca·ucn requll'f'm..nts IUId Ihe op.-r.torp r ivik'vea authul'iz..d at each Ile,,1l8e'd:u<ll Il'v.. l. w.. fN'1 that t h .. " Comm u.n kator Clua··. .. p ropcllWd. ....... InIr.....p inl ..·it h t h " prilK"lplt; IUId " '.. donut &ll: rre ,,·il h till' ma.IUrit y f lllnicornml'nta who _ rte'd that the prMIt t l'S to bf' com'..yed by Ih.. " C o m m u ·nicator Clua" " ere "out of prepcetlun" to t h .. quallf lcaUon req u irem ..nts. NU l'rthl' lf'a, Ilrtoee much timeh... I'lapef'd I!rtoee the IAulU\Ce' of t h eNotl~ 14 y ....I'Il). and since t h ... Am..•I ..ur Radio &",I<'e hll , ro,,'n l bou lS<l'\ in th..t tim .. po:orlod ( .' it h man)' o rth.. ne"· lice......... cornin, from lheCili:<f'na Band R adio St-I""lcel. II Ia ourbf'lil'f I h a t t h .. romrn..n t... and l>t'r h ..pa..,·tn Our Orilrlnal propoo.al. ha"..b<>oomo:- aom.. ·• h ..t uUhlated. Tho:-n.lou. t"'ml'ndoul , ro..-t h hll Ulr.l'np lace In t h .. c1 tiZA"na Band Radio &"".Ice fl4~ In 4 )'e'an); and o uld1111... to lJf't th.. vie... o r th_ neto r 11-ce..-s on th.. n<'flI or d ealrablllty of a"codl'leaa" cl_ or amat...u r lice....... M ·cordl"-"ly. Wf' hope to 1'f'.1Iit thllmatt... lat.. r th ll year In a ne''' rulemul"-" proCfcd lna:.

6. At Ih ls l ime. h o..-u er. ..'... ..·m addreas the matt... o f m e Ume IaaUanceo r t h e amal.#ur ElItra CIaa Ilco:'nseIR M-2030). In th.. N ot koe. ..... PI'OPOlll"dt o adopt this reQueat stnt'I:' ou r recordsIndlC1lited that v..ry r..w ama l.o'un dropou t o r amat..u r radio enee thl'Y h ..v...tt.&inN t h .. &m&te'ur Extra CI&a. W epoin ted out . h o ...e ' ·l'r. Ihat ..h ll... .....,.l ion 3031L)(1l of th.. Communle.t1onsAct o f 1934. u am..nded. allo.·. III to.....u .. opoorator licenses for lire. aectlon3011d) Ilmlta the leml o r the concomitantly laIuf'd l tallo n uceose to n o tmorl' t hlUl 5 Yl'.. ra. At beat then. " ..."" Quld only bf' able to ..Ilm lnal.# th..n l'l'<! to ...talr... t h .. O:-lI.amln.Uon . hou ldt h .. amateu r n...I ..d t o rr n ....- hI>; (orh " r) ll C'f'na.. .

7 . Tn t hl' yl'an s l" t h .. l""llImfl' o ft h e N ollct'. h q ..... '· l' r 'f' h llV.. bt'COm..,' ,' ry "'""111,,,- 1.0 the ad""r... trr('l' U1.uch "'Vf'Cla l C&li.. .. {'ulUI ldt ratlon n lollha"e On our ,'arlou. pa lIOnal (a n d

amat..ur) r adio service data p rocewnls n lerns. W h ll.. w.. ,l..nera.\ ly reta inrues containlnll: information . bou t expired licenses fo r perloda In excess of Iiy..s.. after the ..x ptreucn <lat... tomaintain t h ese m", Indefinalf' lY..'o uld ee a n ...... and burdensome ~Quirement. particu larly In vi..... of thefact tbat ver y f...... people ...'ould bf' exPe'ctt'd to ta..... advantq'.. o f the Ii reume non-ell.amlnallon ",n..wal prtv!·lea:e. In a ...,parate action. we h a v..aml'nded 1 97, 13 to exulld t he ",race'period" for all clasaf'a of lIcenie' f romooe to f1ye )i........ TItIa "xte'rqion willaccommodate' .. &J"f'&t variety of persooat ctn:ulnatanel'll ..hlch hll beenth" basis o f reQu...ta for ,,·aI'·.. r o f Ih e'" I race' period"; and It b. In our opinIon, lUI e'qultable &Ite'maUve to a lifetime. non-examinaUOn rene,,·aI p rh·i·lea:". Aecordinlly. .... have df'CIded t ot..IU no additional action on thllmatt..r.

6. LuUY. the comments flied in reI POnse to our Sll&'leatKIn of eal.&blJah.1nJ ne... sewer limJtI bued o n tranam ilte'r Pe'alt ..m·,,1ope pow..r outpu'werf!. In the main. netratlve. 't1N're,,·ere. ho..e'·er, sey..ral .....POnden...who d id BU&lI:est InnovaUVe' altl'TnaU,·... to our p~ W h ile "e ha....df'cided to tak.. no furth.. r action onthla matl..r at thb tim are stili o ft he opinion that Ihe te of P .......nt·day amate'ur <X>IDlDunieatlonl Wlr ·ran ts t h e use or bf'ttf'r p~ul"f'l todet ..rmine transmlt.te'r PO..·..r than the··plal" \'o ll.al"f' Um... CUrrtnt" InC'thod.We inte'nd to re'isit this matte'r at alat"r time. and ..... eIK'Our&&"<' &milte'urs. In the inte rim. to de"em anddl&se'minal" data ...·hkh could be UIIe'du a bula for a ..·orlr.ab.le and ....te-crthe-art me'lllUrtme nt If'chnIQu",

9. Accordingly. pursuant to t he .u·thorlty cont&lned In sectlolll 41II IUId303 of t h ... Communlcal.lonl Act or11 34 . u am..n df'd: It U o!1tf'n'd. Thatth" proceedinc Is termlnat.t'd. Furth....Informalion about thill act io n by t hl.'Commission m ..y bf' obtained by contacling Mr. J lI.lnl'$ E . McNally. Penon&I R adio D ivisio n . FCC. 19 19 M 8t..N W .. Wllh lnlton . D .C . 20!>!>4 120 2632-7175 l.

FrnEJUot CO M.--oIIlCATlo",aCOMMISSJOM,

W ILLI.lllll J . TJtI C.lRlCO.SecretGrw-.

()OJ9,21fXI.4.':320049:4300!>4;S40100:050 1DS:160110:270115:380120:. 90118:000131,1101362201410330003;310001:420013.:530019il40024:14....~OCJ34;360lXle:47fXI.4.' :56

"""""..""0100:3101011:410110:520116:030121:140118250131:35

,.,

,,,•,•,•,.."""""..""".."~"""""""'""

0..:.. l O<bl1al lnlorrnlllonD.... rloM Long""'"(M.Y) (GMT) of Eq.

eroes l"ll 'W...'"".51.1,,.""11,1.....,"."...,...,."".,47641 0."51.1".'"'".........."'.•".......,...673

.....SlInAbn

"'''~oo..,,,",,005olN7Jbn..,,"'"..""'"....,~oo

8011Abn6031JOO"",,006O'IAA OO.."....-,61000\001I1t >4Abn6128Jbn6142Jbn

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"......",",",00

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1 004J~

2 0138:0113 0031254 0131:425 OO3Ul26 0125.191 002410II 01111;519 00 18:11

10 011Z,3411 001LS412 0101;1113 0ll0Ii:31t4 00S9"~

15 0 1S4:01i11 00Ii3;1811 01~1 :ol3

11 00041:03111 0141:2020 00101021 0134 ;5122 OCJ34112:J 0 128:3424 0027:$$25 0 122:1218 0021:3227 011S:41128 0015:0129 01011:2130 0001:4631 0103:03

Osc.. , 7 Orbltal ln /orm.tlonD'lt r..... Longll""-jM.y) (GMT) of Eq.

eroe,i"ll · W13,867.412.2".•ro...,..,."67.S8U....'"...,..111 .6,....."9...",...718".ro,."...".,67.1..,'"'"

.....

To calculate successive OSCAR 8 orbi t s, make a list of the firstorbit number (from the OSCAR 8 chart) and the next thirteen orbitsfor that day. List the time of the fi rst orbit. Each success ive orbit isthen 103 minutes later. The chart gi ves the longitude of the day'sfirst ascending equatorial crossing. Add 26 · for each succeedingorbit. To find the time OSCAR 8 passes the North Pole, add 26minutes to the time it crosses the equato r. OSCAR 8 will cross theimaginary San Francisco-to·Norfol k l ine about 11 minutes aftercrossing the equator. Mode A: 145.85-.95 MHz upl ink , 29.4·29.50MHz downlink. beacon at 29.40 MHz. Mode J : 145.9Q.146.00 MHzuplink, 435.20-435. 10 MHz downlink, beacon on 435.090 MHz.

,."",..•"..."...","""""'".........."....'""""""""""'"""""""",.•""'"""""""'"...."""""'""""".....,""'"""".....""W20713",,""..."..."."..'"

Courtesy of AMSA TOSCAR 0 rbits.-,-------------.JThe listed data tell s you the t ime and place that OSCAR 7 and

OSCAR 8 cross the equator in an ascending orbit fo r the first timeeach day. To ca lculate successive OSCAR 7 orbits. make a list ofthe first orbi t number and the nex t twelve orbits for that day. Listthe t ime of the f irst orbit. Each successive orbit is 115 minuteslater (two hours less five minutes). The chart gives the longitude ofthe day's fi rst ascending (northbound) equatorial crossing . Add29- for each succeeding orbit. When OSCAR is ascending on theother side ot the world from you, it will descend over you. To findthe equatorial descending longitude, subt ract 166 - from theascending longitude. To f ind the time OSCAR 7 passes the NorthPole, add 29 minutes to the lime it passes the equator. You shouldbe able to hear OSCAR 7 when It is within 45 degrees of you . Theeasiest way to determine If OSCAR is above the horizon (and thuswithin range) at your location Is to take a globe and draw a circlewi th a rad ius of 2450 miles (4000 kilometers) from your OTH. IfOSCAR passes above that circle, you should be able to hear it. If itpasses right overhead, you should hear it for about 24 minutestotal. OSCAR 7 will pass an Imaginary line drawn from San Fran·cisco to Norfolk about 12 minutes after passing the equator. Addabout a minute for each 200 miles that you live north of this line. IfOSCAR passes 15- east or west of you . add another minute; at 30 -,three minutes; at 45 -, ten minutes. Mode A: 145.85-.95 MHz uplink,29.4-29.5 MHz downlink. beacon at 29.502 MHz. Mode B:432.125-.175 MHz uplink. 145.975-.925 MHz downlink. beacon at145.972 MHz.

OSCAR 8 calculations are similar to those for OSCAR 7. withsome important exceptions. Instead of making 13 orbits each day.OSCAR 8 makes 14 orbits du ring each 24·hour period. The orbitalperiod of OSCAR 8 Is therefore somewhat shorter: 103 minutes.

Dicle KV4AA and his SSB operating position, where many of themore than 48,000 OSOs in 1978 were made.

DXfrom J»ge 13

about evenly between CW andsse. They were active for threeweeks and operated during theCQ·WIN 160 Meter Conlest.

Amateur radio operators inSweden and the U.S. will at tempt di rect contact betweenBishop Hill, Illino is, and Blskupskulla, Uppland, Sweden, during the weekend of May 26thand 27th. Bishop Hill was acommunal settlement estab·lished In the 18405 by Swedishimmigran ts , and is no w ahistorical site maintained bythe state of Illino is. Led byW9FKC and SM0FY, the twogroups w ill contact as manystations as possible during thetime period. Special QSLs w illbe issued, and SASEs are reoquested. aSL to WA9AQN.

The Wlesbaden Amateur Radio Club will be going on a OX·pedition 10 Lichtenstein from 26May to 3 June. They will be using the call sign HB0XAA. Thefrequencies they will be usingare: 3.780, 7.090, 14.280, 21 .350,28.650 SSB, and 25 Hz up fromthe bottom for CWo For theNovices, some of them will tryto get on at other times, butnoth ing is scheduled so far. TheaSl manager will be Hugodakobljevicn DJ0LC, Am wernberg 10, 6201 Auringen.

BEATAISLANOThe following letter from Tim

HI8MF P wraps up the recentHllRCD operation from BeataIsland:

" The Beata OXpedit ion was asuccess, with more than threethousand contacts in 52 hoursof operation. Ftttv-three countries were contacted. The firstcontact took place at 2045 GMTon the 25th, and the last wasmade at 1234 GMT on the 28th.

" The trip on the boat to theisland was exce llent. We left theisland six hours before the sett ime, on the recommendat ionsof Navy authorities who saidthey were expect ing changes inthe water currents which wouldmake the trip back dangerous .

" aSL information should besent to: Beata Operat ion, POBox 2191 , Santo Domingo,Dominican Repub li c , West tndies (or via bureau: PO Box1157, Santo Domingo, Dominlean Republic). The cards arealready being pri nted and wehope to start mai li ng themsoon. We would li ke to remindall those who contacted us onthe 27th to send an SAE and 3lACs in order to rece ive the firstday cover.

"The prefix Hl l was activatedfor the first time, and now weare compiling all the mtorma-

162

tlon to be sent to the ARRL inorder to try to qualify Beata as anew country. If this goal isachieved, the group would bewilling to repeat the operationnext year for a week.

"Thank you for your cooperetion, and we hope you apprec iate our effort."

OX NOTEBOOKBangladesh S2

S2BTF shows regular ly onSat urdays near 14275 MHzafter 1700Z.

Qatar A7A7XAH has been showing

around 14225 kH z between1300Z and 1500Z on Fridays.This Is a l ist operation .

senegal 6W86W8Hl has N1ACW as MC

on 14260 kHz from 2100Z dai ly .At 2245Z they shift to 21275kHz.

South Georgia VP8VPBSU has G3KTJ and a SL

manager G3ACA running thel ist Sundays from 1900Z to2100z on 14280 kH z. He alsohangs around this area duringthe week.

Minami Torishlma KAlKA1NC regularly offers th is

rare one to 5BDXCC hunters at1100Z on 3798 kHz.

Christmas Island VK9XIThis Is a club station and

usually is activated on meetingn ights. look for it Wednesdaysaround 14225 kH z after 1530Z.

Aves Island YVIAAIf you receive this magazine

early, you may still be ab le tocatch this one. The operationopens Apr i l 28th and willsecure on May t st at around0600Z. The frequencie s t owatch are: 3795, 7085, 14195,21245, 21295, and 28495 onSSB, and 25 kHz up from thebottom edge on CWoThey willan nounce li steni ng frequenci es.

Peter IslandWilly got to Peter Is land just

about on schedule, but alter anon-s ite survey, any land ing attempt had to be scrubbed. Willydec ided to head east throughthe Drake Passage and Into theAtlantic . He shou ld havepassed through Z09 in Apri l,and present plans call for stopsa t PY0ITrini d ad in May,possibly PY0/SI. Peter -St. Paulin June, and t hen on to theAzores by the end of JUly .

48,100 asos IN 1978With a Iast-mlmrte spurt on

December 30th and 31st wh ichnetted 540 asos, Dick Spence-

ley KV4AA wound up 1978 witha total of 48,100 contacts. Thi swas an average of 131 per day,or one aso every 11 minutes o f1978.

About 65 percent o f the contacts were on CW, with the batance on SSB. A total of 199countries were worked, with enIy a couple o f them being"chased." Assorted equipmentheld up nicely, as did Dick's7J.year<lld health.

Continuous calling by European stat ions on (;oN (even duroing aSOs) and the cooperationof U.S.A. SSB ops, plus contestoperations, made large totalseasy. KV4AA took part in justabout every contest that turnedup. Otherwi se, a sos, thoughshort, were not of the " contest"or " DXpedit ion" var iety. Thismakes a difference of threeasos per minute versus oneevery three minutes.

All this started in 1976, whenDick's AJ3AA bicentennial callresulted in 35,335 asos, or anaverage of 96 per day. A goal of36,500 contacts was set for1978-100 per day. When th iswas passed on OCtober 19th , anew goal of 45,000 was set. Thiswas met on December 14th, andanother 3,100 were worked .

It is real ized that certain teetors are a "must " for suchtotals , such as a fair ly " exotic"cal l and plenty o f t ime. Th is w illlimit most. KV4AA was not oncontin uously, as he works dailyuntil 1:00 pm. Until the latterpart of the year, he was seldomon after 7:00 pm. Stations contacted twice or more oiten during the same day were onlycounted one time, un less themode and band were different.

Invaluable aid was given theproject by YASME (WA6AHF)and other West Coast hamswho handled the KV4AA aSUngchores.

KV4AA's three-year total nowstands at 115,280 contacts.Dick says , " This year , werest-but 't ain't easy gettingused to."

THE RUSSIAN WOO DPECKERThe following report is from

the West Coast OX Bulletin andwas compiled by a W3.

" If you ha ve not heard th isone, you have no t been on theair in the last year or two. Like alot of o ther things, you try tolive with it and wish it would goaway-but it seldom does.Maybe if you know a bit moreabout it, it might help totolerate the burden.

" The 'woodpecker' is a longrange radar; the range can beestimated by noticing that there pe t ition corresponds to25-wpm CW dots. AI this speed,the t ime from dot to dot Is 96milliseconds. This means thatthe radar range is roughly 47mill ion feet , or 8950 miles. Thison-the-air esti mate was donewithout instruments, so it isprobably a bit in erro r. If the actual design range was 15,000km, or 9320 mil es, the erro rwould be only 4% .

" Presuming a ten-rnnuonWatt source, and 18 dBi ofan tenn a gain , t he e ffect iveradiated power, erp, is 88 dBW.However, if you figure twentymeters at 1000 miles, this immense signa l is reduced bypath loss to a mere .CXXl6 of aWatt.

" This might make some thinkthat a one-watt jammer wou ldhave an advan tage over t hewoodpecker o f 1000:1 , but thisis not correct. Not a ll of a [amming signa l will be effective un less it is able to pass throughthe i-f and video fi lters of theradar. A canslant carrier is noteffective at all , because It is rejec ted as a de signal by the accoupled video ci rcuit ry of theradar.

"However, CW dot s will getthrough . Assuming a rise t imeof one millisecond for amateurCW, an additional 2O-dB advan tage is given back to the radarbecau se o f the mismatch in riset ime, video bandwidth, and corner frequency. Not ice that theCW dot jammer, even if only using one Watt, sti ll has a 10;1 ad-

New Products

vantage. A l 00-Walt or a 1000Walt signal would be even better.

"There is some reason tobelieve that much of the aboveis true. For one th ing, t hewoodpecker is only heard onth e phone bands. where voiceenvelopes can be rejected bythe radar video circuitry. Also,if someone is sending CW dotsat 25 wpm, the woodpeckerusually shifts frequency withinfive minutes.

"Some have noted that continuous 25-wpm CW dots on thewoodpecker's frequency havecaused them to stop transmitting-one time, for a period ofthree weeks. The woodpeckerthen returned with a new gim·mrck. When problems cevetoped , the woodpecker would

from page 26

but also allows the internalspeaker to remain unmuted.

The Communicator II has mcorporated a novel mountingbracket which allows forwardand backward slide adjustmentto accommodate virtually anymobile mounting position. Thetransceiver mount mates withthe mounting bracket slidesand the unit is secu red in placewith two quick-tum knobs. Alsoincluded with the Communi ·cator II Is a desk-top bracketwhich snaps in place to elevateth e front of the unit for indooruse.

A 24-pin accessory con nectoris mounted on th e rear of thetransceiver. Five connectionsare factory wi red: PD, ground,at input, af output , and 13.8 V.These will allow easy lnstanation of D , phone patch, orsubaudible tones. The nineteenunconnected pins allow Indivld·ualistic modification wit houtcase damage.

The Communicator II, pricedat $399.00, carries a dearerbacked, factory warranty of onefull year . »e tncom. Inc . ,Amateur Radio Products Group,24105 South Frampton Ave.,Harbor City CA 90710.

A. G. Vaughan K5FQYLos Alamos NM

A GREAT NEW HAND·HELDFROM HEATH

The amateur market is crowd·ed with two meter rigs, yell hadbeen having problems findingone that would fit the budget ofa high-school student. Then oneday a new Heathkit catalog appeared in my mailbox. Glancingthrough the catalog , I found justwhat I had been seeking: Heathhad come out with a new hand-

switch to another frequency onthe amateur band."

Thi s seems very interesti ng,and while we sure aren' t advocating intentional jamm ing, itwould be interesting to expertment around with. The problemis, we aren't sure which wouldbe worse, the woodpecker or abunch of endless CW dots at25wpm.

DX RIDDLEWhich three DXCC countries

all share the same prefix, including numerical designator,yet are located within separatecontinental boundaries?

aSllNFORMATIDN3XlIX to Box 477, Conakry4X4CW to WBlIYHG

held called the VF-2031. I wasnot only impressed with it, butalso I could afford it.

Before I was to purchase it ,however, there were two problems that had to be resolved.First of all, I had heard complaints from owners of Heath'sprevious hand-held, th e HW2021 , which was recently discontinued. It seems that the2021 had many design problems. Was the VF·2031 going tohave gremlins also? After somereflect ion, I rat iona lized thatHeath most likely had receivedmuch feedback on the previousrig's problems, and planned toeli minate simi lar problems fromthe VF·2031. The second thingthat had me concerned was anotice in the catalog at th e bottom of the rig's description.This little blurb stated that thekit was not recommended forbeginning ktt-bultde rs , Al though I had previously builtseveral Heathk its, I was certainIy not in the running for the " Kit Builder's Hall of Fame." I f inallydecided that if I was to becomeexperienced in electronics, thiswould be a good test of my ability . Besides, in the back of mind,I k.new that I could do it. Subsequently, I decided to buy the kit.

Two weeks after ordering, mykit arrived. After opening thecarton, the first thing that hadto be done was to make severalchanges in the assembly manual as directed by a correctionsheet. After this was completed, I glanced through the manualto become familiar with theconstruction of my hand-held.Heathkit manuals are a pteasure to read ; every step is laidout in a clear, precise manner.There is even a separate book ofdiagrams so that one need notconstantly flip between pagesin the manual. Heath also pro-

5R8EA to OZ6MI601FG to 10DUD6W8HL to Box 5012, Dakar8Q7AFfAG to WB4ZNH9J2BO to W60RO9M8HG to Box 2242, Kuching,

Sarawak, Borneo9N1MM to W3KVQ/N7EBA7XAH to DJ9ZBFM7WO to JH3XCUFR7ZUT to N4NXIY7E>< to 170POJ01YA to JH1RNZK1CO/PJ7 to K3RYAKA11W to K8DYZKA1NCtoK4JEXKH3AA to Box 69, APO SF

96305KP4AM/O to Box 717, Oakland

CAlU3ZY to LU2CNS2BTFtolllJNST0HF to G4GFI

vides various goodies to aid inkit construction: solder, desoldering braid, nut drivers, andalignment tools. The only toolthat I did not have for construetlon of the kit was a pair of wirestrippers. Although they are notnecessary, past experience toldme that these devices are veryuseful; I also feared that if I continued to strip wires with myteeth, I would become a LeonSpinks took-euke. A quick trip tothe house of a friend (MikeWB7ECWj netted me a pair ofwi re strippers.

ConstructionAft er pUlling aside the drop

in charger that was built inalmost no t ime at all, I wasready to sta rt the constructionof the hand-held . Glancing atthe pri nted ci rcuit board, Irealized that I would have to becareful while install ing parts;the board is very crowded andthings could become a bi t roughIf I had to remove a com ponentthat was tightly surrounded byothers.

Since the board was compact, most components weremounted vert ically. There wasno room for Heath to put component values or numbers onthe board, but what th ey did do,however, was put different symbols on the board for the cornponents. A darkened-in circle,for example, was the symbol fora resistor. In this way, one couldtell the relative positions of thecomponents on the board.

Be careful of componentplacement with this method, asit can easily lead to confusion.At the time, however, I felt that Icouldn't possibly install a component Incorrectly. It was because of this attitude that areplacement choke had to beordered. I was trying to removea choke that was installed in thewrong spot (it seemed as gooda spot as any after seve ralhours of work) and, much to mydismay, I removed a lead fromthe choke at the same time. This

T2T to W5SBOTF3CW to K1RHV060NT to V01HPVP20XAlB/C10 to W8UVZVP2LG KfLG L·J6LGLlLGK to

WB4SXXVP2MBH to W0SHVP5HX to WA1SQBVPBSU to G3RCAVQ9MR to N5GUVR1BD to W5RBOVR3AK to Box 30323, Honolulu

HI 96820VA6TC to W6HSVS5CW to Box 398, BSB, BruneiWA7JRUSU to W8lZVWH4AAA to W5RUYV0AA to Box 2285, Caracas OFZD9GH to ZS1Z

Many thanks to the WestCoast Dx Bulletin , Long IslandOX Association Bufletin , andWorfdRadio Magazine.

wasn't enough for me, however,as I ended up breaking the glassbody of a diode while makingroom for a capacitor that was tobe installed. Moral of the story:Take frequent breaks and do notrush through the constructionof any electronic kit.

Another thing that I had to becareful about was componentvalues. Poor lighting can raisehavoc with one's eyes , so Imade sure that there wasenough light so as to not strain

Photos by Scott Rumb.ugh

The VF-2031 as i t sits in irscharger.

'63

Circuit board close-up. Note that the PC board Is double-sided.

my eyes. It is very difficult toread the color code of a resistorif the only source o f illumination in the room is a desk lampin the corner of the workbench.Also, a 2.2 pF capacitor lookedvery much like one of the 22 pFcapacitors, as the decimal pointwas very faint . A similar problem arises with the small glassbodied diodes; the bands arehard to see. If in doubt, oneshould use t he magnifyingglass that Heath encloses.

The printed c ircuit board is divided into six sections. Afterone section Is completed, it Isthen time to move on to the nextsection. Heath provides somehin ts that might eliminate muchmisery. They suggest that oneshould take breaks and inspecteach sec tion alter completion.These warnings make the k itsound as if It is very di fficult tobuild, however, which It Is not. Ifound the PC board construction to be fairl y simple; it wasn'tnearl y as hard as I had expected. The hardest part of the kitwas wiring . I had to be carefulthat my soldering iron didn'tburn any insulation from aojacent wires while I was soldering. This was especially truewi th the swi tch wiring, whichwas fairly tight and constitutedthe hardest part of construction.

AlignmentAfter a week of hibernation in

my workshop (i.e., bed room),the construction of the handheld was complete. At thispoint, I brought out my trusty 01'YOM to make the res istancemeasurements. Everythingchecked out fine; at least my rigwasn't going to go up in smokewhen power was applied. I wasnow ready to proceed and alignthe rig.

Alignment procedures havealways been the worst part ofkit construction for me. It isalways frustrating to adjust onecoli and then have to go backand readjust another call,repeating this process over and

'64

over. I was afraid that the sixpages of alignment steps weregOing to take longer to complete than the actual construction of the rig . As it turned out,these steps were completed in acouple hours and were not verydifficult .

The only piece of test equipment needed for alignment is aYOM, an instrument that almostevery ham owns or at least hasaccess to. Rf signal generators ,deviation meters, frequencycounters, and wattmeters areothe r inst ruments t hat arehelpful, but they are not required for alignment.

Several test points on the errcul t board simplify the alignment procedu re. All I had to dowas hook my vol tmeter to thesetest points and use the alignment tool to adjust the c ircuitcoils for a peak or dip readingon the meter. The only roughspot in ali gnment that I encountered was with the receiver frontend. The voltmeter readingshardly varied at all as I t ried topeak the coils. If I had had an rfgenerator, things would havebeen a lot easier. I then remembered that I had a portable VH Freceiver. I tuned this rece iver10.7 MHz below the hand·held 'sreceive frequency. The VHF receiver's circuits put out a heftysignal that could be picked upon my hand-held. Voila! I nowhave an rf signal generator.

I then adjusted the transmitter section, getting a little morethan two Watts output power.The deviation potentiometerwas set to midrange because Ididn't have a deviation meter.Later, I fine-tuned this controlwhile on the air.

The final alignment step wasto get the hand-held exactly onfrequency. I borrowed a frequency counter from my electronics teacher, since the alignment without a counter involvedmore work than with one. Inother words, I'm lazy1 I quicklyadjusted the trimmer inductorsfor each installed crystal . Nowthat the construction of my

hand-held was complete, I wason the air.

OperationAs soon as I put the trans

ceiver on the air, I began to getexcellent signal reports. Theaudio was good and I was get·t lng in to the repeater nne.Needless to say, it was good formy ego to have the rig work well.A day or two later, however, I ranInto a problem. WB7NML hadgiven me a call on the localrepeater; when I answered, hedidn't respond . I called himagain, but he again did not reply. He then cleared and I noticed that the receiver was" motorboat ing." I then realizedthe problem: Nlcads don 't staycharged forever. The meeds inthe VF-2031 last about tenhours on a charge, and on theprevious night I had forgotten toplace the transceiver in it sCharger.

ConclusionThe VF -2031 has many

features that have made itworth more than the $190 thatHeath asks for it, including:. eight channel capability. 146.94 MHz crystal. only one crystal per channel

is used; one crystal rendersone receive and three ( - 600kHz, s implex, + 600 kHz)transmit frequencies

• separate microphone andspeaker bull! in

• BNC antenna Jack• bettery-eevrnc squelch err

cult• earphone• many available accessories

(external microphone, continuous tone encoder, au topatch encoder, amp lif ier, andholster-type carrying case)As demonstra ted by the

above features and the qualityof the rig, It Is obvious Heat hhas come out with a wi nnerthe VF-2031.

Mark Rumbaugh WB7NMMCorvallis OR

THE MIDLAND 13·510A USER REVIEW

For quite some time, I havebeen wanting and trying to getactive on two meter FM. Itwasn't until just recently that Ifound myself in a position tomake the big jump and purchase that two meter rig . Wanting to get the most rig for theamount of money spent, I did alot of studying In past Issues of73 MagaZine to see if anyonehad ever reviewed the variouspieces of two meter mobile rigsand, if so, what they had to sayabout them. At first , as manyarticles were published on add·lng channels to the teem rc22S, I thOught that this wouldbe an easy rig to work with.Then the many various hamoutlet stores started to havetheir year-end sales. The prices

looked better with each Issueof 73. Fin al ly, I made the bigjump and called one of t heleading stores . They were allou t of the IC·22S, as well asmost of the crystal-controlledrigs. I also noticed in theiradvertisement that the Midlandsyn thesized model 13-510 wasbeing listed at $100.00 belowsuggested retail. Luck of thepoor be with me, they had one.So I made the choice, and Ibelieve that I made a very wisechoice. I anxiously awaited theUPS truck; after f ive days, Ireceived the Mid land. As Iopened the box and pulled outthe transceiver, I not iced howeverything was c a re f u ll ypacked. I started read ing the mstruction book and found it tobe very straightforward. In not ime whatever, I had the rig installed and operati ng.

A check of the local repeaterfrequency showed no activity,so I switched down to theLouisville repeater frequency.The louisville repeater is aboutforty miles or more from myhome, but there was ac tivity onthe channel. I waited and listened for a clear period of timeto make a try at keying the repeater. I pushed the mike button and gave my call to see ifanything would happen. What athrill to have a Louisville station come back to me and asktor my iocat ion. Since then , Ihave met many new hams onboth the local and the Louisvi lle repeaters. Believe me, thisis the mode to use, as there isno noise, lots of considerationand assistance to the newcomer on the band, and manygood interference-free asos.

After getti ng used to theMid land , I decided to see whatall was in t he book and learn alittle more about the rig. What atreasure-trove ot information Ifound. Let's see what we have.

First off, the Midland is anall-syn thesized un it coveringthe range of 146.00 to 147.995MHz. It has a one-Watt lowpower position and a 25-Walthigh-power posit ion. Themodulation is direct F-3 and requires a 600-0hm microphone,which is furnished .The pr imarypower requirement is 13.8 voltspositive de plus or minus 15% .Duplex shift for plus 600 andminus 600 kHz is furnished .Two provisions are provided forother offset frequencies.

In the receiver, the fol lowinginformat ion is furnished. It is adouble superhet, with a f irst i-fof 16.9 MHz and a second i-f o f455 kHz. The sensitivity isclaimed to be .5 microvolts with20 d B ot quieting at a signal-tonoise ratio of .3 microvolts at 12dB or more. The audio output is1.5 Watts into an eight-Chmload. Frequency control is thepopular PLL covering the rangeof 127.1 to 131 .1 MHz with no

Social Events

Corrections

doubl ing in the PLL. There are39 trans istors , 10 FETs, 14 integrated circuits, and 28 diodesin the se t. The following accessories are included: mobilemount, dynamic microphone,mike hanger, a spare 7-Ampfuse, external speaker plug,and an accessory plug for theaccessory socket on the rearpanel. The mount is a snap-inunit, which makes it very easyto remove the rig if you don 'twant to leave it in the car. Thepower cable has a three-pinsocket that makes for easy reomover and is so arranged t hatonly the proper po larity can be

from page 123

32233. Price at the door will be53.50.

A large indoor swap area willbe featured , with advance tablereservat ions available for $5.00per table per day from RobbieRoberts KH6FMOJW4, 10557 Atlantic Blvd., it31, Jacksonville,Florida 32211 . Information onexhibitors' booths and spaceare available from the same ad·dress.

Other features and programsinclude statewide organizationmeetings on such topics as tratuc nets and MARS, a microprocessor seminar, a solar powerdemonstration, a OX " pileup"contest, a hidden transm itterhunt , an OSCAR forum, ARRLforums, emergency preparedness programs, OX and contestpresen tations, anten na andtechnical seminars, and muchmore.

More general informationmay be obtained from JHA, 911

I received some commentson my artic le , " Build a HybridCapacity Meter" (March, 1979,pag e 40), and would like torespond .

Through my error. I did notcatch the missing value of thebypass capacitor on pin 5 of the555 (IC1). This component is optional , but If it is desired, avalue of .01 to .l uFwili do.

I also received a letter concerning inaccuracy on rangesother th an the one which iscalibrated. I doub le-checkedmine and the accuracy is morethan adequate. For those reoquiring the ultimate in accuracy, the following may beperformed: Select a 1%, orsmaller, tolerance capac itorthat will be a midrange value

obta ined when plugging the rigin .

The really amazing th ingabout the entire unit is theamount of information that islurnished in the operator 'Smanual. M id land really had theoo-n-voursett amateur in mindwhen they printed the manual.The manual inc ludes, in addition to basic hookup and operating instructions, the toucwing : block diagram, schematicd iagram. wiring diagram, voltage chart, frequency table wi tha freq uency breakdown diagram , top and bottom chassisphotos, detailed printed c ircuit

Rio SI. Johns Dr" JacksonvilleFL 32211.

UTILE ROCK ARAUG 4·5

The central Arkansas RadioEmergency Net (CAREN) Arneteur Radio Club will hold it ssecond annual Ham-a-Rama onSaturday and Sunday, August4-5, 1979, at the Arkansas StateFairgrounds, Little Rock, Arkansas. There will be two mainprizes given, as well as doorprizes. Featured will be forums,dealers ' exhibits, a saturdaynight party, and a large fleamarket. Talk-in on 146.341.94 .For detai ls , send an SASE toMorris Middleton AD5M, 19 Elmhers t Drive , Little Rock AR72209.

ANGOLA INAUG 5

The Steuben County Rad ioAmateurs wi ll hold thei r annualF.M. Picn ic and Hamtest onSunday, Aug ust 5, 1979, at

for the selected range (e.g ., =::50pF for the l -to-1DO-pF range)and adjust the calibrati on contro l for exactly 50 pF. The scalewill then be as accurate as yourcapaci tor, less any nonlinearity01 the meter. Naturally, therange switch should be on t hedesired range.

I a lso received a cal lconcern ing an inabil ity to get atun-scare reading when test inga capacitor that wou ld normal·Iy read at, or near , full scale.Th is can be caused by severalt hings: leaky rectifier d iodes,leaky, fil ter capacitor, me terres istance is too high, or theclock frequency is too low. Theclock should be opera ting between 200 and 300 kHz.

Glen A. Deibert WA4HUUFayetteville NC

board diagram s, FET, transistor, and IC terminal guide , coaxcable plug assembly diag ram,and, the most valuable of all,complete alignment inst ructions. As you can see, it is one01 the most comple te manualsthat I have seen on amateurequipment in some time.

I do not have the facilities torun any real technical stqnet-tonoise tests or to check the manufacturer's specifications forwhat is c la imed, but I can tellyou that all of the on-the-airchecks have been very satisfy.ing . The audio is very c lear and

Crooked Lake, Angola, Indiana.There wi ll be prizes, p icnicstyle barbecued chicken, lnside tab les for exhibitors andvendors , and overnig ht camping (fee charged by cou ntypark). Talk-in on 146.52 and147.81/.21. Ad mission is $2.00.

CEDARTOWN GAAUG 12

The cedar Valley AmateurRadio Club will ho ld its annualcedar Valley Hamfest on Au·gust 12, 1979, from 8:00 am to4:00 pm at the Polk CountyFa irgrounds, on US 278, twomi les east of Cedartown,Georgia. There will be food,drinks, and prizes. Talk-in on147.72/.1 2 (WR4AZU). For moreIn formatio n. please contactJ i m T. Schl iestett W4IMQ,Secretary, Cedar Valley ARC,PO Box 93, Cedartown GA30125, or phone (404)·748-5968.

LEXINGTON KYAUG 12

The Bluegra ss Am ateurRadio Club will hold it s annualCentral Ken tucky Hamfest onAugust 12, 1979, at the Fasig.Tipton Sales Paddock, NewtonPike, Lexington, Kentucky. Theprogram will inc lude grandprizes, hourly door prizes,manufacturers' exhibits, an indoorloutdoor flea market, guestspeakers, and forums. For information, contact the BluegrassAmateur Radio Club, rnc., POBox 4411 , l exington KY 40504.

PETOSKEY MIAUG 18-19

The Stra its Area Radio Clubwill hold its Swap 'n Shop andhamlest on August 18-19, 1979,at Petoskey Midd le School,State and Howard Stree ts,across fr om t he Ca t holicchurch and post office, Petoskey, Michigan. There w'i11 be adonat ion of $2.00 at the door.Tabl e spac e is also $2.00 .Refreshments will be avai lable.There will be a swap and shopon Saturday from 9:00 am to4:00 pm and on Sunday from9:00 am to 12:00 pm. Prizes, aladies' program, and seminarsat 11 :00 am and 2:00 pm on Sat-

plenty adequat e for normaluse. Very l ittle squelch controlrotat ion is needed to have fullquieting. All in all , I wou ld ratethe Midland 13-510 as one 0 1the best units on the market lorunder three hundred dol lars. Ihope you enjoy your rig asmuch as I do mine, and maybesomeday I will hear you on oneof the repeaters across t hecountry. See you on two FM.

Midland Intern ationa l , POBox 1903, Kansas City MO64 14 1. Reader service numberM41.

Billy L. Nielsen WB4APCRadcliff KY

urday will be featured. A banouet at the Holiday Inn on Saturday at 7:00 pm will haveMell ish Reef DXpeditloner BobWal sh WABMOA as gues tspeaker. Banquet t ickets are$7.50 and are l im ited to 200,sold in advance only. For full informat ion and lodging , send anSASE to Bill Moss WA8AXF,715 Harvey St reet, Petoskey MI49770, or phone (616)-347-4734.

ROSEMONT IlSEP 7·9

The Quarter century WirelessAssociation will hold its 1979Chicago Convention on September 7-9 . 1979, at t heO'Hare/Kennedy Holiday Inn,Rosemont. Illi nois. The complete package for the three daysis $35.00. Special room rates willalso be available. There will bethe annual banquet , specialladies' program, various tours,and pri zes. For reservations andin formation, write Phil HallerW9HPG, 6000 S. Tripp, ChicagoIL 60629.

PECATONICA ILSEP 9

The Rockford Amateur Rad ioAssociation wi ll hold its secondannual Rockford Hamfest andIllinois State ARRL Conventionon Sunday, Sep tember 9, 1979,at the exhibition hall at the Win·nebago County Fairgrounds atPecatonica. Illinois, just west ofRockford on US Rte. 20. Ticketsare $2.00 in advance or $2.50 atthe gate. Tickets are availableby mail by writing RARA, POBox 1744, Rock ford , Illinois61110. Please include an SASEfor tickets by mail. Prizes Incl ude a Kenwood TS-520S transceiver and an Atlas receiver.Camps ites are available on site,w ith electric and sa ni taryhookup available. There are 300flea-market tables available at anominal charge. Plenty of freeparking is available. Featuredwill be speakers, forums, cernonstrat ions, and di scuss ions. Aham fest menu , including hotdogs, BBQ, and soft drinks willbe ava i lable at rea so nableprices. Talk-in on 146.01/.61 or146.52.

165

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1425 . 15 7491 . 4074115 .7014H55 ' 2074L72 .2574S64 · 40 .l 121! . 9S 70m .20 5013N" . 757426 .1, 1492 . 4074177 . 50 74H60 ' 2074L73 .lO 7~65 ' 40 ] l QH .95 70lN . 20 5016N 1 .5074]0 .10149" . 40 1' 160 .S0 14H61 ' 25 74L74 .45 74S74 ' 75 ]20X 1 . 00 70m .15 5017N 1.507437 . 15 74100 LOll 74181 1. 50 HH62 '25 741,69 , .Q5 71s.e6 ,' 10 (5 .12 . 151 7U N , I S 505011 1. 507438 . 15 74101 . 2074182 .50 74H72 :25 74L9<l . 70 7~1l2 1:20 322N 1 . 157231! . 30 50S4N 2,501440 .10741n ,30 J4185 1. 1'i 74H74 2'i 141.91 .70 74~1l1 1 20 34()l( 1. 10 J 33H l.00 5056N 1. 60J 441 . ( 0 J412l . 50 741892, 50 . 74L93 . 70 14~1 5 1 '75 16, 9 ,12 , 74lli . 15 50S7N 1 .607442 . 40 74132 ,50 14190 . 7D 741.00 .!S 74L9S .70 14.~'57 ,'00 15,18,21) 74Ul . 15 S05l!ll 2 .757445.4 0 141 41,~074 1 91 .7074W2 . 15 7 4L9al. ] 5 7 4S2 00 4'OO]71H l .15 74~ . 40506W 2 .15

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5739N 2.405741N 2.10

Se lf-5corirg 1QTest• .$3 2/$5

Let Us Fill Your

ONE·PIECE PRICE, When you buy one oftbese towers you lIet the whole towerready to in stall. No accessory charges, noextra COSIS fo, guy Wire, base plates, ere.And even oue comciete one-piece price Isconsiderabl y lowe' than any com parabletower on the markel.

concrete steevee a_allable for Model 40sand Model 55s. By usinll slee_es you canmove tower to anolhe, location and allyou leave Is the sleeve In concrete

ALL THE FAMOUS NAMES-TRANSCEIVERS-AMPUFIERS-ANTENNAS-TOWERS

Give us a try before you buy· Call Jim Titusa Di~ision of TREVOSE ELECTRONICS. INCJ 4033 Brownsvme Road. Trevose. PA 19047

FREE UPS SHIPPINGON PREPAID OROERS

..",. C':::1, l. __ ~J215-357-1400

40' MODELSModel 40 (extends 2f' to 40')

a...ko.... Model 40(e xtends from 23' to 40' wit h breako~er at goundle_el)

55' MODELSMod,l 55 (exte nds 110m 21' 10 55')

Bra.kover Model 55(Ext ends from 23' to 55' with breakove, at groundlevel)

TELE-TOWR MFG. CO., INC.

.... T52

P.O. Box 3412. Enid, Oklahoma 73701405·233·4412

166 ", Reader Service-s"6 page 195

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tmprcvementa and revosions are easily done ",nhthe mcratcr. n you hive the Suplr ExpanalonBeard and $Upel Monilo' memonitor is up andrl.llning at the push of a button,Other on board opno ns OI clode Parallel InpulInd Ou tput Por11 ",ith lulF hand shak' . Theya~o", easyconnection otan ASCII key-board10 theOI pul po r1 . RS 232 ud 20 ma CUlnlnl Loop 10 ,teletype or other device are on board and if yo uneed more memo~ Iher..re two $·100slots lorstatic RAM or vid eo boards. A Godbou1BKRAMboard is a"ailable lor $135,00 Also a 1K SuperMorntor version 2 "" th video dri"erlor fu l capa'bilrty display ",tthTinyBasic andavideo inl erfaceboard. Parallll l /O Por11 $9.85. RS 232 $4, SO ,ny 20 mal/F SUS, S·100 $4.60. A 60 pinCOnJlll c10r sel "'ith ' ibbon cable is available at$12.50 for easy ccnnecnen bet,,"en lIle SuplrElf and tne SUPII Expanaion ' oard .The Powar Supply Kil lor the Super ExpansionBoard is a 5 amp supply ",rth mUtiple posifiveand negat i"e voltages $2995 , Add $4.00 10'shipping Prepunched frame $5.00. Case$10 00, Add $1.50 lor Shipping.

RCA COS mac Super Elf Computer $106.95Comfl/l re leatures betore you decide to buy any teet monttcr n lect and lingle Itep, Large. onother computer. The re is no olher computer on board d'sp lays p,oVlde Oul pll1 and optiona l highIhe markelloday lhat has all the desi rable bene· and low address There is a 44 pin standardhis of Ihe SlIper Ell tor so hlllemoney, The Super connecto r10' PC cards and a50 pmconnector fo,Ell is a smal l single boa rd computer that does the Ouel l Super hpanlion BOlrd Po"'ersupplymilflY big things, It is an excellent computer for and soceers l a, I II IC's are included in the pncetrul ing and lor leammg p,og'amming ",ilh its piUS adelll iled 127 P9 . InstruClton manual ",hichmachine language and yet it is easily u panded no", ,ncludes over 40 pgs. 01software OlIo. rn·", ith additional memory. Ti n~ BUie . AS CII cluding ase ries oJ lessons to help get you startedKeyboards, , ideo ehlrac1er generation. etc. and a mus~ p,og,am and graphics target game,The Supe, Ell includes a ROM monitor tor pro' Many schools an d universities are using thegram loading , editing andexecut,on ",ith SI NGLE Super Ell as a course 01 study. OEM's use it forSTEP lor prollrlm dlbuUing " hich ' S not in - t'aining and resea rch and de"elopment.eluded in others at the same priu. With SI NGLE Remembe" other computers only ollerSuper EllSTEP you can seethe m,croprocessorChip opera- features at add itional cost 01 nOI at a~ , Compareting ",rth me un ique Guesl a~d resli andeata bus belore you buy. Su peo Ell Kll $106.95. Hllihd,splays bl!ore , during and aflef execullnQ In' addfell oplHln $8.95. Low eddress optionSlfuctions. Also, CPUmo<le and instf\J cti oncycle $9.95. Custom Cabinet ",rth drilled an~ labelledare decoded and displayed on eightLEDindicator ple"glass lront panel $24,95. NICld Billerylamps Ml mcry Savlr Kit $6,95. All k,ts and opt,onsAn RCA 186 1video graphics ch ip allows you to also come completely ass<mbled and testedconnect to your own TV ",~h an inexjlflnsi "evideo Iluestdala, a 12 page monlhly soh"a re publica-modulator to dOgraph ics and games, There is a bOn fa, 1802co mputer users is a"ailable by sub·spuker s,stem inc luded lor ",,~rng your o",n smption for $12.00 per year,musK: Or us ing many music programs already T· B . I ANY 1B02 S stwntten. Th e speaker amplih., may also be used my aS1C or y emto drioe re lays lor cont,ol purposes, easselle $1 0,00, On ROM $33.00. Super Elf

, o"ners, 30% 011, Obiect co de IIllillQ with min·A 24 key- HEX "\'board ,ncludes 16 HEX key-s ulI $5.00. Objecllill. manua l and paper tapeplus load. reset. run . walt, Input, memory pro· $10.00. Originl ELF Kit BOlrd $lU5.

Super Expansion Board with Cassette Interface $89.95This is trol)' an astou nding value' This board hasbero designed to allo", ~ou 10 d ec '~e ho'" you",anI ~ optioned The Super upanslon Boa rdcomn with 4K ollow power FlAM lully a~ d ress'

able any",here in 64K ",rtn ll!Jilt· in memo ~ prolect and a cn selle inlerlace Provis ions hi vebeen made lor aN Oltllr oplions on Ihe sameboard and rt fits neatly Into the hard",ood cab inetalongside llle $uper Ell. Theboard includes setslor up 10 6K 01 EPROM 12708, 2758, 2718 Or n2718) and Is lully socketed. EPROMcan ~ usedfortbe mcmtcrand Tiny Basic orather purpos.sA II( Super ROM MonitDr $19.95 is available asan on board opbon In 2708 EPROM which hasbeen preprogrilfl1med ", ith a program Ioaderleeeer and error checking multi hie cassetteread l"'rite soll"'are, (relocat ible cassette hie)anottle, excluSive lromOuest. It inclUdes reprstersave and readout, block move capaMty aJld"ideo o'aphics driver ",ith blinking cursor, Breakpoints can be used ",rth Ihe reg ililer save featu reto isolateprog ram bugs Qu ickly, lhen 10110'" \VIlhsingle step , The Super Monitor is written ",rthsubroutines allo",ing users to takeadvantage 01monilo, lunctions Simp ly by cllliing them up,

$135.00265,00423,003100047000S'UO

$139,00eteneer Board S, gg

Stopwatch Kit $26.95Full six digit batte~ ope rated, 2-5 \'Oils.3.2768 MHz crystal accuracy, Times to 59min " 59 sec.. 99 1/100 sec. Times stc.. spirtand Taylor, 7205 chip, all components minuscase FUll instructions

S·100 Computer BoardsBK Stalic RAM K~ Godbout

18K Stat ic RAM Krt24K Static RAM K ~

32K Dynamic RAM Kit64K Dynamic RAM KrtSKil6K Eprom Kt Iless PROMS)Video interlace KrtMotherboard $39

Hickok 3 '7 Dill It LCD Mullimeter!lalliAC eper . O.lmv-I OOtN, 5 ranges, 0,5%acecr. Resisfance 8 10'" po",er ranges 0,1ohm-20M ohm. DC CU'I..01 to 10oma. Handhejd. ll"lCD dispJays, auto zero, polarrty. werrange, $74.95,

Multi·voU Computer Power SupplyS" 5 amp. %18" .Samp. 5" 1.5 amp, - 5v.5 amp, 12v .5 amp, - 12 oplion. %5v, %12vare regulated Krt $29,95, Krt ";Ihpunchedframe$34.95. Woodgrain case SlO.oo

2 .5 MHz Frequency Counler KitComplete krt less case 537.6030 MHz Frequency Counter KitComplete kit less case $47.75Prescaler k~ to 350 MHz $U.95

79 IC Update Master Manual $3500Complete IC data seleclor , 2500 pg masl e, ref·Mence guide. Over 50,000 cross reterences. Freeupdate service through 1979. Do mestic po stage$3.50. Foreign $5,00 1978 1C Master ciosecut$1 9 SO

Video Modulator Kit $8 .95Convert your TV set intoahigh Qua l~y monrtor",tthout allecliJlll normal usage, Complete kit",ith l ui instructions,

OIl1ltal Temperature Meter KitIndoor and cutcoc-. setcnes bock an d lor1h.Beautiful. 50 " LEO readouts. ,"othing like rtavailable. Needs noa ~ drtion.1 parts lor cernplete, !ulloperation Will measure - 100" 10+ 200'F. tenths of a degree. air Or liQu id,Ve<y eccome. S3g .95OeauMul ",oodgrain case wl bezel Sll .75

NiCad Battery FlxerfCharller KitOpens shOr1ed cells that won't hold a ch argeand then charges them up. al l in one leit "'~ UII

P,lIls and inst rllClions , $7.25

PROM Eraser Will erase 25 PROMs in15 minutes, Uttraviolel , assembled $34.60

Rockwell AIM 65 Computer6502 basNl single board ",dh fUll ASCII keyboardand 20 column lhermal p,in t~ '- 20 char. al·phanumeric display. ROM mon~or, lullye~ pa nd

abie. $375.00 4K versilln $450.00. 4K Assem·bier $05.00. 8K Basic Interprele r $100,00,Po",e, supply assembled incase $60 00

Auto Clock Kit $ 15 .95OC clocl< ",f h 4-.50" d isp~ys Uses ,"aloOnalMA·1012 module ",~h alarm op~on . Indudes19ht dmPller. crystal tmebase f'C boards , Fulyregulated, cemp. instructs, Add $3,95lor beaublul ~",k gray case . Best "aloe all'f'l'here

RCA Cosm ac VIP Kit $229.00Video compute- ,,~ h games and graphics .Folly assem and test $249.00

Nol a Cheap Cl ock Kit $14.95Includes everyth ing extapt case . 2·f'C boards.&-,50" LED Displays, 5314 clock ch ip . translorme' , all components and full instruCllOnsO,ange d'Splays also a"ail. Same kil wl.80'dllpllyl . Red only. $21.95 Case $11 .75

60 Hz Crysta l Time Base Kit $4.40Converts a,gital clocl:s from AC iine IreQu"" tyto c~sta llime base. OUlstandlng accu racy. Krtncruces: PC boa rd , IC. crystal, resistors. ca.fl/lC~OrS an d trimmer

TERMS: 55.00 min. eruer u S. Funds . CalrlraSldenfs ~dd 6%I~x .8ankAmericard and Master CIl~rDe accepted. . FREE: Send for VOUI copV of our NEW 1979Slltppmg cllarges will be added on cllarge cards. OUEST CATALOG. Include 28 1i' stamp.

167

Uncompromising performance.Incredible price.A professional 3% digit DMM Kit for less than $70.

lIol . de ,nu.s....

Inc red ible? True! Professionals and hobbyists alike arebelievers in this Sabtronics 2000, the only portable /benchDMM which offers such uncompromising performanceat the astonishingly low price of $69.95 .Uncompromising performance you 'd expect only froma specialist in digltallechnology such as Sabtronrcs:Basic DeV accuracy at 0.1% ± 1 digit; 5 functions giving28 ranges: readings to ± , 999 with 100% overrange;overrange indication; input overload protection;automatic polarity ; and automatic zeroing.The low price 01 $69.951 Simple : The Model 2000 is allsolid-state, incorporating a single LSI ci rcuit and high quality components. You assemble it yourself, using ourclear. easy- to-follow, step-by-step assembly manual.Kit is complete, including a high-impac t case.Now you too can have it! A professional-quality, 3% digitSabtronics Model 2000 DMM kit for only $69.95, If youdon 't have one in you r lab, use the coupon below toorder NOW.

BRIEF SPECIFICATIONS:DC volts in 5 ranges: 100 p.V to 1 kV· AC volts in 5 ranges :100 p.V to 1 kV · DC current in 6 ranges: 100 nA to 2 A• AC current in 6 ranges : 100 nA to 2 A • Resistance:0 .1 II to 20 MO in 6 ranges' AC frequency response: 40Hz to 50 kHz · Display: 0 ,36" (9, 1 mm) 7-segment LED• Input impeda nce: 10 M{l · Size: 8" W x 6.5" 0 x 3" H(203 x 165 x 76 mm) · Power requirement: 4 " C" cells(not inc luded).

GUARANTEE:Examine the 2000 DMM kit for 10 days. If not completelysatisfied. return unassembled for full refund of purchaseprice, (Less shipping and handling)

Use your Master Charge or Visa.To order by phone call: (2 14) 783-0994

sab~n!A:§@1342 6 Flo yd C irc le • D alla s. Texa s 7 5243

168

r-----------------------,• To: Sabtron ics International. Inc. •• 13426 Floyd Circle, Dallas, TX 75243 •I I• Please send me Sabtronics Model 2000 DMM kitls) •

• at $69.95 each . . . . . . • . . . . . . . . . . . . .. $ •

• Sh ipping and handl ing. $5.00 per unit" $ •

• Texas Residents Add Sates Tax $ •

• TOTAL enc losed $ •I I• Name •

• Street II II C ity II II State Zip II 'USA onl)'. Canada $6 .SO. All other countries. $10.00 (5u rlllce mail) IL ~

2822 North 32nd Street/Unit -1 Phoenix, Arizona 85008 [602] 956-9423We accapt chacks, MasterCharga, and Visa

Prices subject to change without notice

R.F. CONNECTORS

1N91411N414S301$1 .00 or1201$3.00

TORIOAL COREST·37·6 6/1 .0025/4.00, 50/6.00100/1 0.00

MICROWAVE DIDOES

$3.99$7.99

$6.50

REGULA·$6.99 each

FAIRCHILDYOR 78H05KC

B&WCOILS1206T2006T

TUBES61468

MINIMUM ORDER $5.00M in im um Shipping $1 . tnsurance 351: per $100. CODcharges 851: to st reet addressonly! We prefer street address as we ship UPS and P.O.Bo x #"s take up to 50% longerto deliver. We accept VISA orMasterchar ge. Please l is tcom plete card num ber andexp iratio n date. All ow 10%extra for shipping o f heavyItems. We reserve the right tochange prices without not ice.All items listed are subject toprior sal e. Some items l istedare In sm all quant it ies.

1500PIV 1.5 AMPSRECTIFIERS 10/$ 1.50

MC4024P &MC4044P $3.25each

HEP 170 2.5 Ampsl000P1V 10/$2.00 or 100/$14_50

POTTER & BRUMFIELD 12VOC RELAYS4POT 3 Amps $2.95SPOT 25 Amps $5.952POT 3 Amps $1 .994POT 25 Am ps $6.99

BRIDGES 24 AMPSSOOPIV $2.99 each

4CX250BIR SOCKETSAND CHIMNEYS NEW$14.95 per set (1 soc ket, 1chimney)

SEMTECH MINISTIChigh volt age rect if ier s SFMS20K 20,000PIV20ma $1 .99 eac h

$ 1.401.052.001.051.052.002.004.102.103.034.005.005.008.00400

15.001.20

R.F.

$ 2.5017.10

$ .75 or 10/ 6.50-.69 or 10/ 5.50.43 or 10/ 3.50

1.39 or 10/1 0.001.35 or 10/1 0.00.60 or 10/ 4.50.60 or 10/ 5.00.45 or 10/ 3.50

2.95 each.90 or 10/ 8.00.99 or 10/ 6.00

4.20 or 10136.004.80 or 10139.003.35 each5.00 each1.00 or 101 8.502.25 each1.00 each1.05 each

F .E.Yo'sMPF4391M PF112MPF102406733N1282N5248MPF1312N43032N3958M FE2000MFE2001MFE2008M FE2009M FE3002MMF·5MFE1202N34362N 4416MFE131

LM340T-5 & LM340T-12 75¢each

1N2 101N21C1N21WEl N238lN23C1N23CRl N23 ElN23Fl N23WE1N25l N121WE1N2861N416ElN446lN3655AlN5153lN5711

ADDITIONALTRANSISTORS40894MRF454/568BlYCF

LM566V VCOIFUNCTION GENERATOR$.99 each

CHOKE (U252) 2.5mh150ma 30M Hz2/$1 .00

TRIMMERS 5-S0pf45( each or 10/3.50or lIJCL125.00

TRIMMER CAPSsmall enough tof it In you r wat ch3.5·11 pf 75¢ eachor 10/$6.00

R.F. TRAN SISTORS2N2857 $ 1.802N2857JAN 2.452N2947 17.002N3375 7.002N3553 1.802N3818 6.002N3866 1.092N3866JAN 2.702N2866JANTX 4.432N3925 6.002N3948 2.002N3950 26.252N 3960 4.702N4072 1.702N4427 1.092N4671 2.572N4957 3.502NS108 3.902N5109 1.552N5179 .592N5589 4.602N5583 5.002N5590 6.302N5591 10.352N6080 5.452N6081 8.802N6082 10.752N6083 12.002N6084 13.202N6095 10.352N6097 19.35MRF502 .69MAF8004 .75552548 .7540280 3.5040281 10.9040282 11.90

PISTON CAPS 1.2·lOpl751: each or 10/$5.50

$3.993.293.003.50

.50

.43

.362.99

.69

.693.271.503.693.003.291.59

.903.003.00

$90.0034.00

5.095.997.95

12.959.95

29.9532.95

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TUBES3-500Z572BfT160L61466146A6146W811A8114CX25084CX250R6K066LF66LQ6I6JE689502E2638284X150A6360IA6939728912C398072

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CRYSTALS (Con't)

~9!>MC

ss .e57 4558 "59 4:;60 456195666666172 85575 lSS766666782 75OJ..856333309083393 .134693535939353

'""" 35106 850123 51~~

u 1.091655

170

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13,3045MC13.314513.324513.334513344513.354514 31515.01615.036168041717280017.671017.906517.916517.926517.936517 ,946,517966517.97517.9735191001955416,.,21 .9996522.23252357525.47667'9925 99961266666726,896526'ee.ssa27.7777827.928.72826.6888928.928.93888292989629'OOסס.30

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ALL CRYSTALS S.U5

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2.7SS2!l2 762375

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TRW BROADBAND AMPLIFIER MODEL CA815BFrequency response 40 to 300 MHZGain

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"lcrow",e Anoel".. Model MA.a&C11An all solid s late high power lixed tuned C-band RF Geners tor. ThiS unIt is c rys talcontrolled.,nd provides frequenc~ slabl Ut~ in extreme environments , Designed loruse In high performance , ircratt and ground based bNcon applications. th is dev icecan also ba used IS an u~onverter pump for microwave communications rela~.

Frequenc~ Range 6.0 10 6.3 GHZPower Output 1 Watt MIn. 3 Wsns Max.Frequency Stabi lity . / _ 1 x 1~Spurlous Harmon iCS - 30dBInput Voltage 24 to 32 Volts DC

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5299.95

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P15 Kit

P35Wlred

• Deluxe "hf model for "pplic"lion. whe,e ' POcepermi" e 1-1/2 ,, 3" e Mode l. """il 10 COver "ny4 MHz bond in Ihe 26- 230 MHz ronge e 12 Vdce 2 .t"ge• • Ideol for OSCAR . 20 db ga in• Diode tron.ient protection e E",ily lunoble

IN CANADA, order f""" Comm,," ica tlons Pl us, 3680Cote Vertu; St-Lout'<'ltlt, Ouebec or phone 514-3377255. Add J8% '" cover 0:1... loX I'nd exchan •

Note New Address and Phone No•

RF RANGE j - f RANGE4 32-4 3 4 28 -30MH z4 3 2 - 4 3 6 14 4- 1464 3 5 - 4 37 2S-30427.25 61.254 3 9 . 2 5 61 .25Inquir.. About Other Rang'"

RF RANGE '-F RANGE

2S -32MHz 144- 14 8M H"SO-52 28 -30144 - 146 28 -30145- 147 28-3014 6-1 48 28-30Aircra ft 26-30220-222 28 -30222-2 24 28-30Inqu ire About Other Ranges

ONLY 534.95

ONLY 534.95

MO DELC4 32 -2C432 -4C 432 -5C432-7C432 -9Special

LET YOU RECEIVE OSCAR AND OTHEREXC ITING SIGNAL S ON YOU R PRESENT HF RECEIVER l

VHF& UHF FM RECEIVERS

MODEL

C28C50C 14 4C I45C146e llOe220C222Speci,,1

R90 UHF Receiver Kit for "ny 2 MHz .egment of3S0-520 MHz bond •• •• • • • • • • •• •• •• • $89. 95

R70 6-channel VHF Receive' Kil fo' 2M, 6M, 1~ ,

220 MHz, Or com'l bond $69.95Option,, ) "t,,1 filt er 10 ' 100 dB "di chon 10.00

A9 E" truded Alum Case wi th SNC '. fo r"bav e Conver ters (Oplion"l) •• • $12.95

.. N EW G EN ERATION RE CEI VERS.. MO RE SENSITIVE "'MO RE SELECTIVE (70 or 100 dS) !-__..;.;;;;.;.;.;;;.,,;.;.:.:...;;.:;.:;.;.,;:. _• COMMERCIAL GRADE DESIGN" EASY TO ALI G N WITH SUILT- IN TEST C KTS• LOWER OVERALL COST THAN EVER BEFORE

v,,, OSCARHEADQUARTERS

Model TSo- 450$79.95

Wired & Tested

QUT PUT(MHz)

50- 52220-222222 -224144-146145- 146144-1 46

lNPUT(MH,,)

28 -3028 - 3028 - 3028 - 3028-2926- 28

ONLY $59.95!

LPA 2-15 Kit- $ 5 9 . 9 5• 15W out (lineor) or 200 (eI .... C) • Solid St"teT/R Swi tching . Models for 6M, 2M, or 220 MHz

e Broodbond PA e No Tuning Required e el".. C PA• 430-470 MHz«u-tsw Ou l. 200 mW Drive

Frequency Schemes Available:

fEATURES,e U nea r CO'Wefl" . for S58, CW, FM, e le ,e A fmction of the price 01 othe' unit.. ZW p . .. . p . output with 1 MW o f drive. U... low power to p 0t'0 " xci t..,. or "ttenuolo, pod_ easy to "li fT' with buill-in le'l poi"ts

• Use os Lineor or CI.... CPA'• • For XV-2 ><mIgConv..rt.. rs, 150 Exc iters. or ony 2W Excit..,

Tao UHF POWER AMP

LPA 2-45 Kit $109.95• 45W Oul Oi....,,,r) Or rn-N (eI .... C)• Model. for 6M or 2MLPA S-45 Ki t $S9.95For 2M, B- l(M'in, 45W out

MODEL

XV 2- 1XV2 -2XV2- 3X V2- 4XV2 - 5XV2~6

V" Reade, $efllice- see page Ig5 173

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YOURCH OI CE

3 FOR $1

3 FOR $1.25

TI P29 - NPNT IP30 - PNP

T OP QUALITYSMALL SIZE

, ~ 500 MA F S

FRESH!

==i,,_=--_' 52 99 each

COMPLEMENTARY POWER TRANSISTORSSILICON NPN AND PNP. TO-220 CASE.VC EO - 40V PD - 30 WATTS

FOR AUDIO POWER AMPS. ETC

TRIM POTSMINIATURE SIZE'

100 K OHMS

~6FOR $1

556 DUAL TIMER ICDUAL 555 TIM ER IN ONE DIP

75C EACH 3 FOR $2SONY 30 WATT AUDIO AMP MODULE

#STK-QS6. 30 WATTS SUPER CLEAN AUDI O . 20 HZ to 100KHZ .!. 2 DB. HYBRID, SILICON . SELF-CONTAINEDMODULE. ONLY 1+'.)( 2'h INCHES. WITH DATA. COMPAREAT UP TO TWICE OUR PR ICE' 5999 EACH

FILTER CAP2200 MFD 16WVDC

BY PANASONIC SMALL SIZE.

GE Nl-Cad Battery Pack3 Cell pack. gives 4 voltsat 900MAH. Brand new,factory fresh. Each cell IS

2/3 "C " size. $2 .95.Buy 3 packs (12 volls)

for $6 .95. Limited stock!

"THE COLOSSUS"FAIRCHILD SUPER JUMBO LEO READOUTA full .80 in c h character. T he b iggest read ou twe h ave ever sol d! Super efficient . Compare atu p to $2.95 each from others!FN D 847 Common Anode YOUR CHOICE

FNO 850 Common Cathode 51 49 EA

(6 lor 56.95)

LIMITED STOCK!

5 FOR $1

ONLY 1/8 IN. DIA. VERY SENSITIVE.5DK OHM-DARK 1K OHM-LIGHT

RCA

INTERSIL 7107 DVM CHIP

40 PIN IC . MAKES 3'h DIGIT LEDVOLTMETER. CAN ALSO BEUSED FOR THERMOMETERS•AMP METERS, ETC. WITH DATA.

$995 EACH

FAIRCHILD RED LED LAMPS

HAM & GOVERNMENT BAND LIMITED

CONVERTER KIT STOCK

Coverts 134 to 150 MHZ FM to usien on regular AM Band. Complete kitorigi nally designed to sell for about tw ice our price. Inc ludes PC Board . allparts and pre-punched aluminum enclosure! Precision tuning capacitor hascoarse and fine contro l. CLOSE OUT SPECIAL.: $5.99 KIT

GE NICAD!FOUR CHANNEL SCANNER

•• ~:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::1 :1•. .~ ...•.•.........•....•.•....•.....•.....•.•...•...•.•.•.•.•.•...•.•.•.••..•..•..•.•.......•• ••••••••••••••••••••••••••••••••••••••••••••••••••••••••• ••••••••••••••••••••••••••••••••••••• •• •••••••••••• •• ••••••••• •••••••••••••••••••••••••••••••••••••••••••••••• •••••••• •••••• •• ••••

i{ffi( ·········E·LE·cTR·ONic ·PARTSS·A·R·G·AiNSf ·········':f~I::::: GENERAL INSTRUMENT OP AMP SPECIAL HEAT SINK:::I::::: FULL WAVE BRIDGE LM 358. MINI DIP. HOUSE #. 4, 2Y" 1I::::: 4 AMP 600 PIV WORKS ON SINGLE SUPPLY. BLACK - FINNED ::::•••••. A SU PER G EN . PURPOSE DRILLED FOR TWO .••.I::::: 3/4 IN. SOUARE - WITH LUGS DEVICE. SAM E AS 1/2 LM 324. TO-220 CASES ::::

im~: 75¢ ea. 3 FOR $2 #LM-l 59¢ $1.29 : : ~:••••••I::::: MOTOROLA POWER TRANSISTOR DC PANEL METER••••••I::::: HIGH VOLTAGE I~.I::::: MJE 3439 - PLASTIC POWER CASE ••••••. VCEO-35DV. 15 WATTS......I::::: 2 FOR $1••••••••••••I::::: SUB-MINI PHOTO CELL••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••..-----------c::-::-:-:::==:-:==-:-:::-::::------'----r----------,;:';';--,;;;:;~:,:."7-;;:--- ..•••••••••••••••••••••••••••••••••••••••••••••••••......••••.. --"'''''''-''''''''''''''''''''''''-'''''''''-'''':..:T:::::'---,<;;-d.~''':O--T--....JL--------'''':...'---'''':....:c...:.....::~.:.::.:::.:::...- ..••••••••••••••••••••••••••••••• PC Board only. A sens itive two bandI::::: RECEI VER on a board measuring only•••••• 3x2'h In, Units were puchased when•:::::: HYGAIN closed its Puerto Rico plant.

••••. Will scan four crystals on the VHFI::::: (high) band or the UHF band. Works•••••. off 6VDC. Some units may requi reI::::: slight tuning. We provide basic hook•••••. ups, but have no schematic at th is t ime.I::::: LIMITED QTY. $••••.. 5.99 each .•••••...-- - -----------T'-------;;'i'i:re,.:n;"';t.O';;;;;;-----T---"'''''''-.:iiir''u.-r;,---- - - ···••••••••••••••••••......••••••••••••......••••••••••••••••••••••••••••••••••••:::::: 8 FOR $1•••••• •••:::::: MINI PROJECT CASE :::I::::: ifFLV5057. Med ium Size. Clear Case. REO EM ITTING. These are not Black Molded Plast ic 2 '4 x , '" x 2 1N. Has open front . w ith mounting :::I::::: retested off-spec unitsassold by some of ou r competition. These are ears so unit can be easily attached to auto dash . etc . Case has ...•••••. factory prime. lirst Quality, new units. mcicec card guides for mounting PC Board inside. Pet ect lor dIgital :: :I::::: 10 FOR $1 19 clocks, car burglar alarms. o r almost any electronic p roject. Can also :: :•••••. be used for encapsulat ing c ircuits o r modules. ...

I::::: 50 FOR $495 Super Speci al Purchase! :: :

I::::: · WE BOUGHT 250,000 PCS." 75C EACH :::•••••• •••••.... ..'•••... O· ·t I R h C t' TERMS: Add 30C postage. we pay balance o eeers uocer SI !; add 75(: •• •I::::: Igi a esearc orpora Ion handling No CO 0 We accept V isa MasterC harge and Ameflcan E~press :: : '

:• • • •. (OF TEXAS) cards 'r ex Res add 5'110 Ta ~ FOfe'gn orGefS (exCepl Canada) add 2O'lIo P & H ... '••••• 90 0 M B k G I all t s •• '

...~·:.:P.O. BOX 401247 GARLAND. TEXAS 75040 (214) 271-2461 ay oney ac ua-an ee on I em :: : '.......; : -::..•...' " .•. .: ....•.....•.•.•.•....•......•.•...............................................•......•..•• •••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••...................................................................................................................................................................................

'•..•••••

(450 NS RAMS! )

1$129 KITI

ASSEMBLED AND FULLYBURNED IN AOD $30

B lank PC Board w/ Documentat io n$29.95

Low Prof ile Socket Se1...13.50Support lC's (TTL & Regulat ors)

$9.75Bypass CAP's (Disc & T antalums)

$4.50

YOUR CHOICE

3 FOR $1

regu lators are provided

~PRICE CUT

TIP29 - NPNTIP30 - PNP

8 FOR !!!8."!,9.~95l\-,...,.........- .........450 NS! 2708 EPR M

Now full speed! Prime new units from a major U.S.Mfg . 450 N.S. Access time. 1K x 8. Equiv. to 4-1702A's in one package.

$995

16K DYNAMIC RAM CHIP

COMPLEMENTARY POWER TRANSISTORS

SILICO N NPN AND PNP. TO-220 CAS E.VCEO - 40V PD · 30 WATTSFOR AUDIO POWER AMPS. ETC.

T housan ds o f computer systems rely o n this rugged , workhorse, RAM bo ard . Designed for error-free, NO H ASSLE,systems use.

KIT FEATURES:1. D OUbted sided PC Board w ith solder

mask and silk screen layout.Goldp lated c o n t act l ing ers,A ll sockets included,Fully buffered o n all address and datal ines.

4 , Phanto m is jum pe r seiectable to pin67.

5, FOUR 7805on card ,

16K X , a M '6 Pin Package. Same as Mo' tek 41 ' 6-4 250 NS access. 410"IS cycle time. Ou, besl p"ce yet fO'lh i. stateol the a'l RAM 32K aM 64KRAM boa'd. usmg th,s ch ip a,e ,eadily a" a,labl". The." a,e new, lutlygua,anteed device. by a maiO' mIg VERY LIMITED STOCK!

OURBEST

SELLINGKIT!

$59.95KIT

KIT f EATURES1 Add'essable a. Iou' sepa'a,e 4K Block,2. ON BOARD BANI< SElECT CifCUl'ryICromemco StaM a'd'). Allow, up 10 512K onIi",,!3. Uses 2114 (45ONSI 41< srene Rams4 ON BOARD SHECTABLE WAIT STATES5 Double sided PC Boa'd, with solder mask andSi lk sc'e",,&<! layouL Gold plaled contact lingers6. All add 'e.. and da'a lin"" lully buner&<!7 l<i' includes ALL pa"s and soc' etsl:!. PHANTOM," Jump-a<&<!'o PIN 6 79. LOW POWER under2 ampsTYPICAL from'he06 Voll Buss10. Blank PC Boa,d can be populate<! a' anymult'Ple of 4K

16K STATIC RAM KIT-S 100 BUSS

FULLYSTATIC, AT

DYNAMIC PRICES

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WHY THE 2114 RAM CHIP?,. , We feel the 2114 will be'lle next mduSlfy ' landa'd,• • RAM Chip llike ,he 21 02 wasl Thia meana p" ce,,•• a.a lla ~il ity . and quohty will all be good' Next, the,. , 21, 4 is FULLY STAT 10 We 1...1th.. IS theONLY' " way to go on the $-100 Buss' We'" e all heard thaI •• HORROR .'orre' about Some Dynam,c Ram' " Boa'ds hav'ng ,roubla with OMA and FLOPPVI •• DISC DR IVES. Wh o needs these kiM s 01

I • • p,oblems? And finally, even among othe' 4K' " Slatic RAM's the2114 ..andsoot' Not all 4K ..alrc... Rams afe cr..ated e<1ual' Some 01 'he othe, 4K'., . . ho.e cloclled Chip enablelines anova" ous timingI . ' WIndow' j<lot .. "'Rica! a, Oynamic RAM'. Som"... 01 00' oompe!,tor'. 16K boa'd' use'h"" ·'tr icky", •• d....ice•. But no, us' Th" 2"4 i. th" ONLY logical... choice for a t'ouble-Ifee, st,a'gMfo,wa' d desrgn..., . , BLANK PC BOARD W /DATA- $33..., . . L O W PROFILE SOCKET SET- $ 12 ASSEMBLED & TESTED- A D D $30, . . SU P PO RT IC'S & CAPS- $ 19.95 2114 RAM'S- 8 FOR $69.95

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• •• USES 2708's!

••. Thousands of personal and business systems around::: the world use this board w ith complete satisfaction.: :: Puts 16K of software on line at ALL TIMES! Kit features::: a top quality so ldermasked and si lk-sc reened PC board::: and f irst run parts and sockets . All parts (except 2708's)••. are included. Any nu mber of EPROM locations may be,..••. disabled to avoid an y memory confli cts . Fully buffered 2

::: and has WAIT STATE capabi lit ies. 3,...OUR 450NS 2708'S ASSEMBLED

ARE $8.95 EA. WITH AND FUllY TESTEDPURCHASE OF KIT ADD $25

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GENERAL INSTRUMENTFU LL WAVE BRIDGE ~4 AMP 600 PIV ~

3i< ' ''' SQUA RE · WITH LUGS

O rig inally used by HYGAIN to ind ic ate ti me andChannel on an expensive C ,B , Mini size, se lfcontained module Not a Ki t. f our d ig its p lusfl'lshing ind iC'l tor for seconds. Includes MM 5369and 3.58 MHZ crvstsr for super accurate time base.W ith hookup data

MALLORY COMPUTERGRADE CAPACITOR

30.000 MFD 15 WVDC

Small : 3 x 2 Inches$1 .99 e a . 3 For $4.99

New' REAL TIMECompute' Clock Chip

N .S. M M5313.Feature.BOTH 7 ""lIment andBCD outputs . 28 PinDIP. $4.95 with D..le$15.99 KIT

"THE COLOSSUS"FAIRCHILD SUPER JUMBO LED READOUT

A full ,80 inch character . The biggest readout we haveever sold! Super efficient . Compare at up to 52 95 each

from ethers! YOUR CHOICEf N D 843 C ommon Anode •FN D 850 Common Cathode 14 9

ea. L111.'

LAB-BENCH VARIABLEPOWER SUPPLY KIT

5 to 20 VDC at 1. AMP. Short circuit protected bycurrent limit. Uses IC regulator and 10 AMPPower Darlington. Very good regulation and lowripple. Kit includes PC Board , all parts, largeheatsink and shielded transformer. 50 MV. TYP.Regulation.

75~ .. 3 FOR $2

NEWI

- #MA6008

MFGR's CLOSEOUTLIMITED OTY.

INCLUDES C RYSTAL TIMEBASEIWORKS ON 12 VOC !

Z-80 PROGRAMMING MANUALBy MOSTEK, or ZILOG . The most detailed explanationever on the working o f the Z-80 CPU CHIPS. At leastone full page on each of the 158 Z-80 instructions . AMUST reference manual for any user of the Z·80. 300

a es, Just off the press 12.95

NATIONAL SEMICONDUCTOR

CAR CLOCK MODULE

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85 TON SURPLUS DEAL!!!170,000 pounds of new surp lus electronics was too much for ei ther Digi tal Research Corporationo r Bullet Elec tron ics to handle ALONE! So we pooled our resources and rolled a convoy o f foureighteen wheelers into our new Texas wareh ouse. Yo u may order any o f the below items fromeither company along w ith any other items from our respective ads elsewhere in 73. However,please DO NOT order Bu llet Kits from Digi tal Researc h. o r vice-versa.

TEMPERATURE CONTROLLED HEATING PLATE

........"..' ""- ~~ e-? ... .......~

- ..... '=~ .: ...,,- --. - ..40...,...,....•.

......,.." ' ....- -~ ....t:~,""""",2.99....." ". ~

" , ~ • •M ' • • ,~

". ~ ....

•••

5~ x 1 0~ In. 120 VAC. 120 WATTS. Made of 1/4 In. tempered pl ate glass wi th N i-Chrome heat ing element laminated toback. Element size is 4 '1. x 9 '1. Inches. Double protected by TI KLiXON Thermostat and two thermal fuses Each alsohas neon ready light.Besides the obvious use as a bun warmer, food warmer . coffee warmer. glue warmer . etc .. our tests show this plate tobe an excellent warmer fo r fer ric chloride solution used in etching PC Boards by hcbbvists. Ty pically increasesetching efficiency by 300% over room temperature.Non-Submersible.

99¢ EACH 100/$14

CMOS PARTS BONANZA- ,- ~-c- co r :

.4'-':n u,uY',l.-f;:-::"'::· ",)'

/S'-' ,.., j . 'r,J .:.I ' .

-; d;,,"~if' \ ~.~..! ---.J IT" ~., I:J: .. ,' " .1

,~ :. . ~ .lI.'?~..~y~\to':' . _ (

Complete Module: 2 x 1¥. In .Contai ns: MC14553 3 DIG IT BCD COU NTER. MC1451 1BCD to 7segment decoder latch, CD4060 OSCILLATOR and RIPPLECOU NTER. CD4011 Nand gate. Also was square N .O. pushbutto n. 9V battery clip, SPOT Sub-Mini sl ide SWitc h. Plus misc.resistor, caps. tran sistor. All parts easily removed . Reg . Dist. Liston MC14553 alone is over $4 each '

FIBER POINT PENSWri tes on almost anything. Water Soluble ink.Designed to write on plastic etc. Black .Fine Tip. 49 CValue.SPECIAL: 6/$1

PUSH BUTTON SWITCHN O. SPst. P.C. Mount. Same as used on CMOSParts Bonanza at left .

5 FOR $1

74C903 CMOS:

75¢ (MODUl E O Nl Yj

Ori ginally custom designed for a large US Consumer Mfg. These were used as partof a weight loss prog ram. Unit counts up to 25 bites w ith 24 f lashes between bites 10indicate chewing rate. Has 2 Digit LED readouts. adjustable on board osci llator. 4Bit Microprocessor With PROM. Our experimentation shows ttus mod ule has manyappl icat io ns fo r liming, pacing. etc. Also there are on board SIgnals that canproduce various beeping, warble and exotic tones. Some appncanon data IncludedComplete uruts in case, as above: $2.49 each.

6/$1Nat ional Semiconductor. New CMOS Part. HexInvert ing Buffer. Use for interface tra m PM OS 10 TTLor CMOS. Can Drive LEO'S.

o

goo

ORDER FROM EITHER COMPANY: SEE TERMS OF SALE ON OUR RESPECTIVE ADS

Digital Research Corpration(OF TEXAS)

P.O . BOX 401247 • GARLAND, TEXAS 75040. (214)271 -24 61

BULLET ELECTRONICSP.o. BOX 401 244E· GARLAND. TE XAS 75040

(2 14)278-3553

176

v" RUder Service-see pelle 195 177

•.. and we also have ...••••••••••••••••••••••••• ••••••••••••••••••••••••••••

Heath H8 owners are recogniZing that Econoram Vroilers a truly superior value; where else can you find a12K board at this low price thaI is luUy static, draws aminimal amount of current, and is expressly engineeredfor full electrical and mechanical compatibility with theH8? This memory comes as an easy-to-assemble " unkit"(sockets, bypass caps are pre-ecrceree in place) andincludes simple, Clear instructions.

HEATH H8 MEMOity 12K OF MEMOityBAitE BOAitD CHIP FOit THE

MEMOity SPECIAL HEATH H8: 5200SPECIAL 535! 2102L1'ow 24K: 5399

power, better than450 ns speed) 1Kstatic RAMs are nowonly 99C while theytest. Only good onorders of 10 or more.

Don't need the full 12K 01 our standard H8memory? We now otter the board, mountingbracket, edge connector, and schematic lor onlyS3S. Populate it with a lew support chips andreadily available, low cost 2102$ to build yourmemory up to a lull 12K whenever your budgetpermits.

XlSOOK

Xl1MXT1 .84320Xl2MXT3.58MXl4MXT4.5315MXl5MXl8MXl9MXl1 0MXT1 2MXT1 SMXT18MXl20M

ROCKS (some people call them crystals)

500 KHz, series mode, fund amental, wire leads, HCSiUpackage . • • $04.95Same as above. but 1 MHz .. . $5.95Same as above. but 1.84320 MHz . . . $5.95Same as above. but 2 MHz ... $5.95Same as above, but coIortlurst (3.58 MHz) .. . $2.254 MHz, series mode , fundamental. HC1 8 pkg . • • • $4.95Same as above, but • .5315 MHz ... $04.95Same as above. but 5 MHz ••• $04.95Same as above. but 8 MHz ••• $04.95Same as above, but 9 MHz $04.95Same as above. but 10 MHz $04.95Same as above. but 12 MHz •.• $04.95Same as above. but 15 MHz •.• $4.95Same as above, but 18 MHz •.• $04.95Same as above, but 20 MHz ... $04.95

ItF POWEIt TltfiNSISTOItS2 GHz RF power transistor. Pd max (@ 25 degrees ct3.SW, Poul min @ 2 GHz BY""', Pin 310 mW, efficiency@ 2 GHz 30%., rooeo shape, similar to RCA 2N5470.$04.952 GHz RF power transistor. Pd aTW, Pout 2.5W, Pin300 mW, efllciency 33%, cross shape. similar to RCATA8401. S5.952 GHz RF power transistor. Pel 21W, Pout 5.5W, Pin1.25W. etliciency 33%, cross shape. Similar to RCA2N6269. $8.952 GHz RF power transistor. Pel 2f1N, Pout 7.5W. Pin1.5W, efficiency 33% , cross shape. Factory selected,prime 2N6269. S1.95

lZV 8A POWER SUPPLY KIT S44.5012A @ 50% duty cycle, foldback current

limiting, crowbar overvol tage protection, manymore features. For transceivers, portableteoerrv equipment, disk drives, etc. Easy toassemble - except for transformer. diodes,and filter caps, all parts moun t on heavy-dutyci rcui t board. Does not include case.

MA1003 CLOCK AHD CASE SPECIAL:

$19.95!

WE EVEN STOCKKNOWLEDGE ...

The Adam Olbome & Associates books onmicrocomputers are recogn ized as the tops in theirfield . .. lucid and complete, they cover virtually allaspec ts of ml crocomput ing. Prices have gone up onthe new editions, but we stili have some of lastyear's books available at a good price.

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EllQ'" Meter 2!lO u. f IlS'" 518" x 1 :lIll" hoi", DeSk Top Style $1995ea. OB-51226-1 cover on one endMig holes on each end 111..·· behind pa~L Serviceman Special 56.5O ea 101$50.00Black scale O-~ bollom1·20 tOIl New Hy·G..in "Och CB Less Cue. Sp.... ke ' & Knobs (as is)$12'5ea 51$5,00 $14,95 e.

MINI TOGGLE SW 2 SIDED Son,II.I(&4.EFJ CRYSTAL OVENSEdge meter same as ..ec-e with sil.er scale .0112~I CI..t "'ard 2conDuctor mini 01101'10

and ,eadsSWR t·\O C&H g ',," x ' O '~' · pluQ ..'palcn cord 3'6" 6V112V 75"$1,25ea 5/$5,00 SPOT $2,OO&a 3/55 ,00 long 52,OOe.I$5.00 ea.SI ,OOea 61$5.00 POLY FOAM COAX 50 OHM

E. F. Johnson Signal Strength E. F.JohnsonEqual to RG174 MOTOROLA SRF 574

Meter '""u. 2'I. " " 2'il"' Sq. moon!s in $4.951100' house markedt ~." hole I" behInd pa.nal $cal,,: 1-30 db lop 40ch serecrc- l ow l ossO-~ bottom Swilch Polyloam 9W 175 MHz Amp...... """ 00

S3.5Oea Coax Cable 55.00 ea.

PANEL METERS CB SPECIAL MUFFIN FANS

$4.00 ea 210r $7.00 Brand new printed ci rcuit board assembly. Used in all 3 Blades, 110 Vac , 4 JIo " sq .HyGa in 40 channel CB transceivers . Fit s many other Removed from equipment-

1().{).10dc AmpS } manufacturers' units also. Squelch potrvotume cantrall Excellent condition - 54.9525"()'25dc Volt s

2'1. " x 3"channel selector switch not inc luded.

1· 9-7.50 ea. Board RECEIVER FRONT ENDS0-25 dc Volts } 21/a" X 2%" 10·49-6.50 ea. O,mens,ons Made by EFJ()'5O ac Volt s

50·99-6.00 ea. 6"' . 6 '1, " 132·174 MHz·Shunt Required- 100·up-5.5O ea $1 2.00 ea.

TRIMMER CAPSCMOS 12 Vdc RELAY 12 Vdc RELAY Small enough to fi t

RCA CD 401 2 AE SPST Open Frame SPST 35 Amp Contacts in your watcn-,

Dual 4 in Nand Gate 5 Amp Contact s Open Frame 3.5 to 20 pF

61$1 .00 1001$10.00 Mlg·Magnecralt Rugged, great lor mobile use 5toJOpF

50156.00 10001$80.00 $l .50ea 4/$5.00$.4.5Oea 5/$20.00 $.75 ea., 2 for $1 .25

5 for $3.00

D Cell Nicad CRYSTAL FilTERS CAPSmfg. by G. E. 2.50 ea Coax Connectors 10.731lead 2200 UF @ 16V1.2 volts 3.5 amp hrs. UG·2731U BN C·FIUHF-M 2.50 Can Type RadIal leads

cat No. 41B004 AOOSG5 UG·2551U BN G-MIUHF·F 3.00 $3.00 ea. .25 ea. 10/$2.00UG·146A1U N·MIUHF·F 4.50

Computer Grades UG·83B/U N·F/UHF·M 4.50 CERAMIC IF FilTERS NEW BOXER FANS23,200 uf @50 Vdc 3.00 ea UG·175 AG·58 Adapt . .20 EFC l455K 5 blades 110 VAG

3" diam x 4V, " high G. E. UG·176 AG·59 Adapt. .20 53.50 ea. 4 '/a" sq.-$11.95

GOLD PLATED CARD EDGE CONNECTORS

Double Row/Solder Eyelet .156 22 pins/Double Row/Dipped SolderDouble RowlWlre Wr8p .100

6pins $1 .10ea 101$9.00 .156 $2.OSea 101$17.0025pins $3.4gea 101$30.00 15 pins $1 .55ea 101$12.50JOpins $3.96ea 101$32.00 22 pins $2.08ea 101$17.0050 pins $5.43ea 101545.00 22 plnS/Doubl. RowlWlre Wr.p

43pins $3.66ea 101$30 .00 .156 $2.44 ea 10/$19.00

All",.,.".lgu.,.M#lfId e "'g, .tty flNsorl rou." nol",,,,-. our prodtK" ",.ybe " 'UrnH "" '1'1 ,,, IOIl.y. lor. lUll ,.'u"II /Ie... I'I'PP~I. Pt..se.fkI S3TERM S: lor . I'I'PP'''fI ."11 "e"lIlrttfJ on ell ortlws.•llll'/IO".15% "I'Ierge lor sl'l'PP"'fI etty " e", g..., 5 lb. COO'. e""ep/elllor ord.,. Iglilittfl S5O.OO or "'ore. All ord....

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EQUIPMENT I COMPONENTS I WIRE & CABLE I ACCESSORIES

182

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Published Decem ber 1st, 1978

RADIO AMATEUR

CALLBOOKS

Respected worldwide asthe only complete authoritytor radio amateur

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UNITED STATfS CALLBOOK

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The U.S. Callbook has over350.000 W & K list ings. It lists

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FOREIGN CALLBOOK

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$14.95

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Specialize in OX? Then you're~ ' ::z;z;;,;' ca ..:. "' '. ant.~look ing tor the Foreign Callbaok "with over 280,000 calls, names andaddresses of rad io amateu rs outside the USA pl us many valuable.additional features of interest tothe OX'r.

See your favorite electronics dealerfor the latest issue or order directfrom the publisher using handy orderform.

Payment in U.S. funds mustbe sent directly to publisherDOt through I bank.

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Blinky Flasher Kit $2.95PC board, 555 & ail parts wo,ks on 9 vall s. Mouse but ton $1.00

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InCludes PC Boa ,d. Cr ystal. al l parls and inst ,uc 'IlOna $495

For reprinl on ly send SO cents lor Mndling

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RF DEVICES2N2876 IBW 200 MHz T0602"1 3375 3.DW 400 MHz T0602"13553 2,5W 175 MHz T0 392"13866 1,OW 400 MHz T0392N3B26 70W 175 MHz T0602"14"27 lOW 175 M HzT0392"1558\1 3,OW 175 MHz MT7l2"15590 l OW 175 MHz MT722N5591 25W \ 75 MHz MT722"15913 1.75W 175 MHz T0392N6080 .,OW 175 MHz MT722N608 t 15W 175 MHz MT722"1 6082 25W 175 MHz MT722N6083 30W 175 MHz MH 22N6084.((1W 175 MHz MH 22N6O\loI 4,OW 175 MHz Xl06 PNP2"16095 t 5W 175 MHz Xl06 PNP2"1 6096 30W 175 M Hz Xl06 PNP2"16097 .OW t75 MHz Xl06 PNP

Aroerco can supp ly 3 PC boards. Silksc reened front panel and complete in st ru ction s tor only $12.50 & shipping.

See si. page con struction article in

Dec. 1\178 73 MagaZine

l 1C90 P,escale r74C925 Mult ip lexF9368 O' i, e ' (2~

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SOME PARTS USED IN COUNTER

144 to 149 MHz 1000 CHANNELS

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AEC 1158

NEW

SHOWN WITH OPTIONAL ~P·800 MICRO PROGRAMM ER

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Buy you' KDK 2016A f,om Aldelco and we'li pay shipping and insurance inthe 48 stal es.

All the features o f the 2015R and now with adjustable s ine wave PL 60 Hz to203 Hz. Adjustable low power position 1 Walt to 16 Walts.

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$359Regulat ed ACiPSMod el FMPS·4R ., $39 95

AEC 1074 SOWall@30M Hz$21.15AEC 1076 75Wall@ 50 MHz $24.00both cases 500 4LF L

OVERVOLT 12Cro w Bar ci rcui t pro tectsTransceiv ers & Tape Decks fromrunaway power supply voltage thatcan zap expensive components. OV12 causes fu se in Pow er Supply toblow il vo ltage exceeds preset level(approx. 16 to 18 vol ts). Rated at 25Amperes. $ 7.95Model OV5. Protects 5 YoIt c ircuits.Tri ggers at 7.5 vons $8.95Other uni ts ava ilable at 3.3 to 100 TriggerVoltages $10.95 ea

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KIT• Sell Compleling DaIS & Dashes . Prov,sion for anacnmeot 01 256 0' 512. Iambic Operation Bit Memory lor DX or Contest wor~

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r-- - - - - - - - - - - - - - - - - - - i Sim ple law cost Memo,y Kil , Uses 2 p'ogrammable 1101 Memo,y ch ips, p,o·v,des 2 canned messages o! 30 Characters each . A.daptab ie 10 Handbookand othe, Accukeye, s. Includes PC boa'd (same size as accukeye, board)and all pa' IS. Rllqul,es5VDC,9VDC, $19.95

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RF TRANSISTOR SPECIALS2N5589 3 Walts175 MHz $3,75

2N5590 10Watt s175 MHz $5,SO

Add 6% ,hipping. Add Sl.00 fo r o rden u nder S1 0.00. 0 ", / a f U.S.A . add 15% sh ip p in ll a n d " f'! r t i fw d chllclt o r maney o rder in U.S. fund••

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•DIODES/ZENERS CMOS L1NEARS, REGULATORS. etc.

• QTY.QTY. QTV. Q T V .

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=i' ~MCT' .95 LM323K 5 .95 LMJllO 18·1. Pin'1.1 9

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~LM34OT1 2 .se LM725 ,..

lN1S3A 6.2v 500 mW Zener .25 4007 .20 LM m .ss LM739 reclN758A '''' .. .25 4009

~~KI340K'511.~ LM340T1 8 es LM74' (8-1 4' .35

IN759A '2v 4009 LM340T24 .ss LM747 '".. .25 LMI' .15 LM340K12 ..25 LMI 307 ..25lN5243 l:', .. .25 4010

~ LM31 1.75 LM 340K15 125 LM I.58 .65lN5244B ' 4, .. .25 4011 LM32Q 6 .79 LM340K18 125 LM 3900 .sclN52458 15, .. .2 40 12 .20 LM J20H15 .7'9 lM340K24

~LM1!>451 .65

4013 4 ~H24 .79 M 7 NE555 .OS

SOCKETS/BRIDGES 4014 .75l MJ2QKS 1.65 lM377 3.95 NEm

~• LM320K1 2 1.65

:it~ jiNE56• 40158-pin "". .20 - .35 .75 LM320K24 1.6 5 N~

14-pin "". .20 - .40 40 16 .35 LM320TS ' .65 ?BlIS NE5 740 17 .75 LM32QT12 1.65 ?aMOS ze1f). "0 • .20 - .40 401 8 .75 LM320T15 1.65

1S pin "". .25 - :! 4019 .352O-pin "". .35 - . 5 4020 .85n -pin "". .35 - .95 4021 .75

.. T T L

24-pin "". .35 .95 QTV . Q lV . lOll Y • arv.- 4022 .752B-pin b .45 1. 1400 ... 1482 ." 14221 1.00 14LS0 2 .acww 4023 .20 1401 ." 1483 ." lU61 ss 14lSM .304D-pin b .50 - 1.25 4024 .75 1402 ts 1485 ... 15108A .as 14l S05 .asMolelt pins .0 ' To·3 Sockets .25 4025 .20 1403 ." 1486 .25 l M91 .5O 14l S08 .ss2 Amp Brid , oo-p" .95 4026 1.95 ,... ." 1489 1.05 1M92 .5O 14LS09 ..25 Amp Bridge 200-"" 1.50 4027 .35 1405 .25 1490 ... 14Hoo ." 14lS10 ...

4028 .75,... .25 lUI ." 14HOI ." lUSl l ...

TRANSISTORS, LEOS, etc. 1401 .. 1492 ... 14H04 ,. lUS20 .,.• 4029 1.15• 1408 ." 1493 ... 14H05 ,. lUS21 ..

2N2222 12N2222 Plast ic .101 .15 4030 .30 ".. ." ,n. ." 14H08 ... lUS22 "2N2222A .19 4033 1.50 1410 ." 1495 .5O 14Hl0 .as lU$J2 ":;r PNP :!= 4034 2.45 1411 zs 1496 ... 14Hll ,. lUSJl ...PNP Plutic UnlTW"ked

'"390< NPN IPlastic U.......rkedl 4035 .75 1412 >S 74100 1.15 14H15 ... "WI ...,.'"30" NPN .OS 4037

1i

1413 >S 14101 .25 14H2O " 14lS40 ..'"3055 NPN 15~ .'" 141 4 ." 74121 .ss 14H21 >S 14lSoI2 .t s

4040TlP125 PNP o.rli on 1.95 1416 .25 741n .ss 14Hn .ec 14LS51 ...

LE D G.... Red. Cl.r Yellow .15 404 '

~1411 ... 14123 " 14H30 ,. 14LS14 ..

D.L747 7 518" Hi co.....noct.1.95 . 5 1420 " 74125 .. 14H411 25 14lS1& .SOMAN72 7 CO""'nodlIlRIId~ 4043 .50 742& .25 14llfi ." 14H511 ." lUSI& ...MAN3610 co,.,..no<:te (InI 1. 4044 .65 1427 .25 14112 .rs 14H51 25 7US!l0 ..MANS 2A 7 co.....no<:te IYeilow 1.25 6 1.25 ",. ." 14141 '" 14H52 ." 14W3 ..MAN74 7 com-cathode lRed l ,.ec 4048 .95 1432 ." 141511 .. 14Hs:! .25 lUSIOl .SOFND359 7 com-cnhode (R ed 1.25

4049 .45 14n zu 14151 .. 14HSS ." lUS123 1.20lU8 ." 141s:! ." 14H12 .as 1USI51 ..

9000SERIES 4050 .45 1440 " 14154 .ss 14H14 .as 1USls:! ...,. QTY. 4052 .75 1441 1.1 5 14156 ." Wll01 ." l US1S1 ..'30' .85 9322 .ee 4053

~1U2 .OS 141 51 ... 14H l03 .. 14lSI60 .ss

'309 35 ''''' .204066 .5 14U .OS 141&1 ... 14H106 as 14 l S1&1 1.20

9316 1.1 0 ''''' .454069/74C04 .35 1444 .OS 14163 ... 14100 25 14 l S193 1.05

MICRO'S, RAMS, CPU 'S, E-PROMS 4071 .25 1445 ... 141&1 ... lU02 zu 14lS19S ."4081

lU6 ." 14165 1.l0 lU03 " 14lS244 1.10,. QTV. .30 1441 ." 14166 l.25 lUOoI 14lS3&1BT13 I." 210 78 ..... 4.9 5 4082an ".30araa r.eo 2114 a.ec lU8 SO 14115 SO 7Ul0 ae lUS368 ..

BT" '00 2513 &25 4507 .95 "SO .25 14116 " lH20 as 14Soo "9T1l7 '.00 2708 10.50 4511 .95 1451 .25 74180 .. 74lJO ..~

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ADD $1.25 f OR POSTAGE/ HANDLING

VARIABLE POWER SUPPLY KIT $11 95

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NEW SPECIALSLM3t8CN High Speed Op Amp 50W". mOIP 50,94 1N270 G.rmlnium Diode 80V 200mA 4/51LM3t8D High Speed Op Amp 50V/"s DIP .90 1N823 Temp Comp R,ferenc,LM339N Quad Comparetor Single or Dual Supply .79 6.2Vt5% t .005%f C SO.60LM380N·8 Y.W Audio Pown Amplifier 8·22V .90 lN914 Silicon Oiode100V 10mA 251S1NE567V TOil' Oecod,r (PLL I 0.01Hz to 500kHz .99 1N3044 100V Z,ner lW-Better than an OB3 .75

XR567CP Tolle Decoder (PLLI 0.01Hz to 500 kHz .99 1N3045 110V Zener lW-Better then en OB2/0C3 .75

lM723CN Precision Voltage R.gulator 2.J7V DIP 'lSI1N3071 200V 100mA Switching Diode 40ns .30

LM147CN Dua1741 Compensated Dp Amp 'IS' 2N2915 NPN Dual Ttensistor 3mV Match /1100 $1.95

SA01024 Dual 512 Stage (1024) Audio Deley Une 2N3819M N,Channel Rf fET 100MHzAmp .35"Bucket Brigade" Appl. Data included 518.95 2N4020 PNP Duel Tten.htor 5mV Match /1250 5,00

XR2206CP funct ion Generator with epptic. data 4.40 2N4445 N·Channel f ET 50 Switch 3.50

XR2242CP long·Range PrK ilion Timtf ". to day. 1.50 2N5394E Ultre·Low No illJ·fET Audio Amp 51.251 YEAR TIMER Kit·2 XR2242's end Applic. Note 3.00 2N5912 Dual J·fET Rf Dit Amp to 800M Hz 2.90

LM29111N Ouad Comparator +5V or 2 to 36VOC 51.20 2N6028 Progremmable Unijunction Transistor .45

CA301 8A 4·Transistor Array/D arl ington .99 2N6449 300 Volt N·Channel J·fET AmplS"" 2.00

CAJ028A RF/IF Amplif ier DC to I20MHz US CP640 Broadband fET Rf Amp 140dBRC4558 Dual High Gain Op Amp mDIP 'IS' Dyn Ranga $4.50

SPACER Kit· 4 til of 5 .nOrl" size spacers $1.00 EJ04 N·Chnnel Rf fET 3.8dB Nf lit 400MHz ...MPSA12 NPN Oerlington Transistor /l2D,000 .75

115 VOLT Regulated Power Supp ly Kit·Easy assembly, TIS88 N·Channel fET 400MHz Rf Amp .605mV regulation, 100mA, fully protected .

RESISTOR Kit-150 pcs !loW, 20 most common values,Includes all components and herdware,no PCB or clle-Add 51.50 for shippillg 513.95 individuelly pecklged , 5 to 20 pcs n ch . 54.95

PC BOARD Moullting Kit-8 easpacer, screw, nutend wllh.r-32 pcs tctal, 51 ,00

SEND FOR ADVA'S NEW 1979 CATALOGNEARLY 1000 SEMICONDUCTORS, KITS, CAPACITORS, ETC.-SEND 254 STAMP,

ELECTRONICS

BOX 4181 GB

WOOOSIDE, CA 94062

Tel.14151 328-1500

. 86

REPEAT OF A SELL-OUT A "'""plete 12 hour digilal clock. Someare manufaclura tine rejects, soma a re returns.and some are just scratched. F9aturas :hcu"s. minutes. alarm, srccee a larm.Pan s YQ!uep lone woUld llqUIII $20.00 . youpay orly $6.00 ea. •.

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(with case) •••.••.....••••••.. " .95SIEMENS MAGNETIC SENSOR . . • • . 1 .9943143 GOLO EOGECONN.•156 95P IBMI N. 12VDC RELAV D.P.D.T 1 .99

FREE BY POPULAR OEMANOWIth min. purchase d 150.00, you ......receive tree . • 5 function Nalu.l5emicorll:tda LC.D. ITIlI'I'lII ....teh. WIthmin. purchase d $100.00 you willl1lC8....tree . CU" LC.D. car cicek. l ....teh andclocklM:tve11i9lld in Dec. i98ue d 73 Mag. )

For M..ur Ch.rgeIVi..Orde... UHOur

TaU FREE HOT UNE:1-8Q0.42S-oS34

for .,.... o~kI.W ••hinpn(incl. AI••b & Hew.ii)

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CLAIREX PHOTO CELLSThne tBve a real USEFUl. range 10 ttemNpt p "*",,,I fttoI¥-ing ......""ol fro'n an-....IiltIl kweIlI~ utI1ll:e Ihia P"lClto cell. lJltIlresislaJ'ce 1K. Fast fd/:UiM. .15& [)Iwn.e• . $.751MlCh or VS1 .00.

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5 1$1.1 94 / 1....941 1.5941 1.59

" '$1 .00411 .1941 1.49.. , 1."9

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lOO ~$2.40

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$1".95 ell

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SOLID DIPPEO TANTALUM CA-PACITORS 1-99 100 PlUS

.1 X35\1OLT .23 .19

.15 35 .23 .19

.22 35 .23 .HI

.33 35 .23 .19

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1.0 35 .25 .201.5 35 .29 .232.2 35 .31 .253.3 35 .36 .294.7 35 .38 .306 .6 35 .50 .40

10 .0 35 .60 .4815.0 35 .79 .6322.0 35 1.39 1.1233.0 35 2.08 1.66"7.0 35 2.65 2.12

VALUESANDCUANT. MAY BEASSORTED 10 ATIAlNCUANT. PRICING

NYLON TIE WRAPS3" 65000.... 650025.3" 650036 .9" 65000f

10 .S" 6500513. 0" 650061....... 65055SCREW MOONT13.6" 65050f

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,",ce151$1 .00151$1 .00121$1 .00121$1.00101$1 .00101$1 .006 1$1 .0051$1 .005 1$1 .0051$1 .25" '$1 .25" '$1 .25" '$1."9" '$1 ."93 1$1 ."921$ .99

20 1$1 .00

WAllSIA1A' A'A'A1A' A3A3A3A3A3A3A3A3A3A

10M

GALLIUM PHOSPHIDE L.E.O.'.Provide grealar light out-put. brlghtercolora. grealer uniformity and less cwreradrain than regular LE.D.'a.110 DI AMETERPIN 72.. H Red Dlffusad

724G Green DlffU98d724V Yellow Diffuaad7240 Orange Dlffuaad

.220 DI AMETER7UH Red Dlffusad7uG Green DI1Iuaed7U V Yellow DIffUS&d7140 Orange DI1Iuaed

.220 [M AMETEA (lQwdorM)7CMA fed Ditfusad ..1$1.597CMG Green DIffUMld 41 1.657CMY Vellow DIffuIed " I 1 .Sot7G40 (h nge Diffu9ad .., l.Sot1Cl1R-g DuaIIAedandGreetl)

$2.8$ 215.00MOUN11NG HARDWARE.220 Dilnwter ,7.MH 121$1.....

• WAn 5%OEPOSITEO CARBON FILM RESISTOR ASSORTMENTSASST. A 10 ea 1 OHM 1.5 OHM 2 OHM 2.7 OHM 3 OHM 3.6 OHM

" .7 OHM 5.6OHM 6 .8 OHM 8 .2 OHM 100 ~S2.40

ASST.B 10eal00HM 12 OHM 15 OHM 18 OHM 220HM 27 OHM33 OHM 39 OHM ..7 OHM 560HM 1OO~S2.40

ASST.C 10 .. 68 OHM 82 OHM 100 OHM 120 OHM 1500HM1800HM 220 OHM 270 OHM 330 OHM 3llOOHM

ASST.O 10ea ..70OHM 560 OHM 680 OHM 820 OHM 1K 1.2K1.5K 1.8K 2.2K 2.7K

ASST. E 10 .. 3.3K 3.9K " .7K 5.8K 8.8K 8 .2K 10K 12K15K 18K

ASST.F 10 .. 2lK 27K 33K 39K "7K 56K 68K 82K 100K'20.ASST.G 10ea15I)K 1801< 220K 270K 330K 3llOK ..1OK

S60K 680K 820KASST. H 10 .. 11.4 1.21.4 1.51.4 1.8101 2.21.4 2.71.4 3.3101 3.91.4

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ElectronicSales~",

_---=A""'''=:-'''''Mtmi'll11 ppollllc's '"~ .~eoo,o.~. 2322 , . " .... . kact ...w_.••' 21 • (I Dal a u.II02S

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TRANSFORMER PrI.l10 VAC Sec.11.2 and 5 vcr Ii' .1 a",,-,. $.ts • •

CLOCK OISPLAYNal;onal Semi. 6 Dig~ MuNiplexecl Display; .33" Owracters (Common Callrode) . A REAL BUY AT JUST $1.00.

EDGE METER 1004-100 ua 1/2" by11116" . Compare with other me terscooing $6.00. 0r1Iy $2.00 ea. 'Mly pay~.1

LINE PRINTER HAMMER DRIVERBOARD Each board contains llppral.130 Ndl ' M,lBlOO (Silicon Der1lng1onNPN hie 750. 1.5A). A/:lQJt $1 30 .00worth, MIf 100 1N4OO1 (lodes, pIIAMJPPOI1 chips. The lIIotIole pacIrage Is )'OlIIb' cny $14.ts.HU RRY, WE DON'T EXPECT THESE TOLAST VERY LONQr

DIOOESTYPE VOLTSlN4001 501N4002 100I N<003 2001N4004 "00

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MINIATURE D.P.D.T. (PUSHBUTTON ] momentary. rated 6A1125 VAC.mlcroswi1ch pan .SN2021 . 0r1Iy $1.S4.

••••..............-- -

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---A-_ ...---.

---~ - ... ... .... .. ... ..

---- I-- .. ----- I------------ I

MOTOROLA 4 MHZ XTAL OSCILLATOR U pin dip pIIg., 5 VOC In, ..MHz out. TTl.c~tiblfl. Ill.M N .

INSTRUMENT CLOCK CASE KITA real je....., tor \t1oelJ ..II projects.Hinged top Door alloWs you to hicle yourCOIlbol area . 0 .0. 4""" J[ .... J[ 1'l4 " .Sl .t9 NCh.

OB-25 FEMALE CONNECTORA uoique assembly originally adapling theRS232 Typ!I Connacta to flat cable. $1.50MCh ot 2/$2.50 .

INSTRUMENT/CLOCK CASE KITPerle<;t for 'fOUr opto projecls . SoIk1allJn'llru'll construction with real watnulsidea. 0.0. 5-318" by 5-318" b'I 2" .$8 .i5 N .

~ _ ~ ~ w w _ p p p

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OEFECTIVE CALCULATORSWllll, some are and DTI8 .... not. ......can't .\'Iord the tim! 10 .. Item $2.50N . Batwlea not InckJdlld. 2/'S.ot .OO.

NATIONAL SEMICONOUCTOR - 6DIGIT CLOCK MODULE A IN.-.clock fNtIrtlg .lInn and .IOOIUI ••rmhn::tlon.~ (:QI, .....le wIltI ffffJf'flhing. All you IIdd Is • ~ cord and '-----'--'--'--'--'''---'--'.:..:.--',::-.::::..::::..::::.-:::.::.:::::..:.:=---1swItcheI. &ell mocIuIe utilizes cbcreet rCOli ipOill:ll'll3 andIs rMdy lor )OJ to rJICUItIn ycu encm... DI!IpIIIy Is 6 NCh ......,8e\li'l8llts, .33 rdwle Ngt, clc::lCk:hlr> ..MM5J75. <M'I fIUiI';' be rnwnIed In eitherd (U Ntn.menl cloc:kca. klIa. " 4.15.

CALCULATOR GUTSElQ:ei i ,liH1IIH'$ d111igl1. Each key1:loIIrdInclWes • monoIttNc calc.....1Of chip and__yo 'JhesB are rejects. It~ belIOmlItlWlg almple to repe r Of • oouId be~~. At fQ prkle . oM1o c.resI e¥OIl. 11.50 N . V$3.00.

'67

== licENSE srudy quidss & TApES==

19GeneraClass

LicenseStudyGuide*-'Q.~--Tli,<CIIFJ_* TIIU}Il~1

1S•NoV}C\a~

Licet1Stu~Gu·

_NOVICE STUDY GUIDE-SG7357-Here is a completely new studyguide and reference book for the potential ham. This Is not a queetlon/answer memorization course, Electronic and radio fundamentals arepresented and explained in an easy-to-understand fashion, preparing thebeginner for the Novice exam. Includes the latest FCC amateur requrenone , as well as application forms. Easily the best path into the excitingworld of ham radio I $4.95.'

_ GENERAL CLASS STUDY GUiDE-SG7358-A complete theory courselor the prospective General or Technician. This reference explains transistor, amplifier, and general radio theory, while preparing the Novice forthe "big" ticket. After getting your ticket, you 'll use this guide again andagain as an electronic reference source. Not a question/answer guide thatbecomes dated when the FCC updates the amateur exams, $5.95.'

_ ADVANCED CLASS STUDY GUIDE-SG1081-Aeady to upgrade your license? To prevent retaking the FCC theory exam, youneed the 73 Ad vanced theory guide. SSB, antenna theory, transmitters, and electronics measuring techn iques are covered Indetail in this eeey-tc-touow study guide. Special modes and techniques, such as ATTY, are also treated. An engineering degree isnot neces sary to master Advanced theory-try this book before visiting the examiner's off icel $5.95.'

_ EXTRA CLASS LICENSE STUDY GUIDE-SG1080-Before going for your 1 x 2 call, It pays to be a master 01 the Extra classelectronic theory. Thi s st udy guide Is the logical extension of the 73 theory course. All the theory necessary to pass the exam ispresented. Antennas, transmission lines , swr are discussed, as well as noise, propagation, and specialized communicationtechni ques. This book is not a classroom lecture or memorization guide, but rather a logical presentation 01 the material that mustbe understood before attempting the Extra exam. Save yourself a return trip to the FCC and try the 73 method first ! $5.95,'

. ., • ' .• NOVICE THEORY TAPES-CT73OO- Startling Learning Breakthrough. You'll be astounded at howrea lly simple th e the ory is when you hear it explained on these tapes. Three tapes of theory and one ofquestions and answers from the latest Novice exams give you the edge you need to breeze throughyour exam. 73 is interested in helping get more amateurs, so we're giving you the complete set 0 1ourtapes for the incredibly low price of ONLY $15.95.'SCient is ts have proven that you learn faster by listening than by reading because you can playacassette tape over and over In your spare time-even whileyou'redrivlngl You get more and more Inloeach ti me you hear it.You can't progress without solid fundamentals. These four hour-long tapes give you all the basicsyou 'll need to pass the Novice exam easily, You'll have an understanding of the basics which will beInval uable to you for the rest of your life! Can you afford to take your Novice exam without first listening to th ese tapes? Set of 4-$15.95,·

. .,

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73 CODE SYSTEM TAPES

SSTV_SLOW SCAN TELEVISION

TAPE- CT7350-Pnze-wInningprograms Irom the 73 SSTVcontest. Excellent lor Demo!$5.95.•

~ ",," ,aJ'st~

. I I ••~COOE COUll"

• J•

. I • . , \

code, sent st theollicial FCC standard (noother t spa we've heard uses these etendards , so many people f lunk the codewil en they are suddenly-under pressure- l aced with characters sent at 13 wpmand spaced lor 5 wpm). This tape la notmemorizable, unlike the zany 5 wpm ' ape,since the code groups are entirely randomcharacters sent in groups 01live.

'ICOURAGEOUS"20+ WPM- CT7320-Code ie what getsyou when you go lor the b lra class II·cense. It Is so embanasslng to panic outluet becauas you didn' t prepars yoursellwith this tapa. Though this Is only oneword laster, the code groups ars so dUll·cult that you'll almostlall aSleep coPyinllthe FCC stu fl by comparison. Ussrs reportthst they can't bel ieve how easy 20 perreally ia wi!fl this fantast ic one hour tape.

.IOUTRAGEOUS"25+ WPM- CT7325- This Is the tape lorthat small lI roup 01 overachieving hamswho wouldn t be content to simply satlslythe cod e requirements 01 the Extra Classlicense. II's the toughest tape we've gotand we keep a permanent Ill e 01 hams whohave mastered It. let uS know when you'reup to speed and we'lI lnscrlbe your nameIn 13's CW " Hall 01 Fame.""BACK BREAKER"

13+ WPM-CT131 3-C ods lroupsagain, at a brisk 13 per so you w II be atease when you sit down In Iront 01 thesteely-eyed government Inspector and hestarte sending you plain languale at only13 per. You need th is extra marg n to evercome the panic whiCh is universal In thetest sltust lons. When you've spant yourmoney and time to take !fill test , YOU'llthenk heavens you had thlaback·breaklnlltape .

liTHE CANADIAN"10+ WPM- CT7310- 73 hasn' t 10rgoUenthe Cansdlan hams- our 10 WPM tapeprepares you to brlleze through you, ooun'try's IIcensln ll exsm s.lIke ths other codegroups, the tape Is not memorizable and,once mastered, provides a margin 01 n !e·ty In the ectuattext situation.

"THE STICKLER"

"GENESIS"5 WPM- CT7305- This Is tM beginningtape lor people who do not know the codest all. 11 takes tnem thfOtlgh Ihe 26lellers,10 numbers and necessary punctuallon,oomplel e with pracuce every sl ep 01theway using th e newest blitz teachlnl teennlques. " la almost miraculous! n onehour many people-Including kids 01 ten- are able to master the code. The sase 01Isarnlng gives con lldence to beginnerswho might otherwise drop oul .

8+ WPM-CT1306- Thls is the pracUcstape l or the Novice snd Technician II·eeneee. It Is made UP of one solid hour 01

Any Four T.p•• For 115.85114.85 EIIchl-

• '(1)(O~f COl./ftSf

/ · ....., ItUse the order card in th e back of this magazine or Itemize your order on a separate piece of paper and mail to:

73 Radio Bookshop • Peterborough NH 03458. Be sure to include check or detailed credit card information.•Add $1.00 handli ng charge. Not e: Prices subject to change on books not published by 73 Magazine.

\SSTV-~~---

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SSTV.X:Jjj)

L

• • • •

FOR CUSTOMER SERVICE CALL (603) 924-7298

===~13 TEChNicAL libRARY===~

• BEHIND THE OIAL-BK7307-By Bob Grove. Get more fun outof shortwave listening wit h th is interesting guide to receivers,antennas, frequencies and interference. $4.95.·

eTHE CHALLENGE OF 160-BK7309- is the newest book in the73 techn ical library, dedicated to 160 meter operating. 51 Dunn previces all necessary in formation to get started on t his un ique band.The !l 1I -impo~tant anl,:"nna and 9rou!'Id systems are described Inceteu. The introduction contai ns Interest ing photos of SlewPerry's (the King of 160) shack. This reference is a must lor newand experienced " Top Band" operators. Price: $4.95.·

erc OP·AMP COOKBOOK-BK1028- by Wa lter G. Jung. Coversnot only the ba sic theory of the Ie op amp in great deta il , but a lsoincludes over 250 practical circuit appl ications, liberally il ·lustrated. 592 pages, 5% x 8% , softbound. $12.95. '

~-'••

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e lNTRODUCTION TO RTTY- BK7380- A beginner's guide toradioteletype inc luding teletypewriter fundamentals, sign als ,distortion and RTTY art. You can be a Rn y artist! A 73 publication . $2.00. ·

e THE NEW RTTY HANDBOOK-BK7347- is a new edition andthe onl y up-to-date Rny book ava ilable. The state of the art hasbeen changi ng radically and has made all previous RTTY books obsolete. It has the latest c irc uits, great for the newcomer and expertal ike. $5.95.'

e PROPAQATION WIZARD'S HANDBOOK-BK7302- by J. H.Nelson . When sunspots riddled the worldwide comm unicationsnetworks of the 1940's, John Henry Nelson looked to the planetsfor an answer . The resu lt was a theory of propagation lorecast ingbased upon Interplanetary align ment that made the au thor themost reliable forecaster In Amer ica today. The book provides anenlightened look at communications past, present, and future, aswell as teaching the art 01 propagation forecasting. $6.95."

e SSB • •• THE MISUNDERSTOOD MODE-BK7351- by James B.Wilson. Sing le Sideband Transm ission .. _thousands of us use Itevery day, yet it remains one of the least understood facets ofamateur radio. J. 8 . W ilson presents several methods of s idebandgeneration , amply Illust rated with charts and schematics, wh ichwill enable t he ambitious reader to construct his own sidebandgenerator. A must for the technically-serious ham. $5.50.·

e SSTV HANDBOOK-BK7354(hardcover), BK7355(softcover)This excellent book tells all about it , from its history and ba sics tothe present state -ct-tne-ert techniques. Contains chapters on c ircui ts, monitors, cameras, color SSTV, test equipment and muchmore. Hardbound $7.00, softbound $5.00.'

eWEATHER SATELLITE HANDBOOK- BK7370-Simple equipmen t and methods lor getting good pictures Irom the weathersatelli te. Anten nas, receivers, mon itors, facs imi le you can bu ild,tracking, automatlc control (you don't even have to be home). Or.Taggart WB800T.$4.95. ·

~~mL-

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~~:::::::::==ANTENNAS======e 73 DIPOLE AND LONG·WIRE ANTENNAS- BK1016- by Ed·ward M. Noll W3FOJ. This is the f irst collection 01 virtually everytype of w ire antenna used by amateurs . Includes dimensions, configurations, and detailed constructlon data lor 73 different antenna types. Appendices describe the construc tion of no ise bridges,line tuners, and data on measuring resonant frequency, velocityfactor, and swr. $5.50. •e 73 VERTICAL, BEA M AND TRIANGLE ANTENNAS- BK1069by Edward M. Noll W3FOJ . Describes 73 different antennas foramateurs. Each desig n is the resu lt of the author's own experiments covering the construction of noise bridges and antennanne tuners, as well as methods for measuring resonantlrequency,velocity factor, and stenotnc-weve rat ios. 160 pages. $5.50."e VHF ANTENNA HAN DBOOK-BK7368- The NEW VHF Antenna Handbook details the theory, des ign and const ruction of nundreds 01 different VHF and UHF an tennas ... A practlcal bookwritten for t he average amateur who takes joy in building, not fullof complex formulas lor the design eng ineer. Packed withfabulous antenna projects you can build . $4.95. '

Use the order card in the back 01 this magazine or itemize your order on a separate piece 01paper and ma il to:73 Radio Bookshop e Peterborough NH 03458. Be sure to inc lude check or deta iled credit card information.

"Add $1 .00 handl ing charge. Note: Pr ices subject to change on books not published by 73 MagaZine.

FOR TOLL FREE ORDERING CALL 1-800-258-54 7 3

• NEW REPEATER ATLAS OF THE EN·TIRE WORLD-BK7345- 150% as big asany list ever available-nearly 900 morerepeaters listed. New Improved mapsshow the locations by frequency 01 everyrepeater in the States . Only $1 .95:

-_.---~--

• BACK ISSUES- Complete your couecnon: many are prime collectables now,classics in the f ield ! A fu ll collection is an

Sole Y invaluable compendi um of radio and etec

'7:~:-::;;;.~~,,~o~nics knowledge!r,W Single back issue-ST<xx:Xl- S3.00";

2'llSDVl 25 our choice-ST25OO-$10.00' :", 25 your cholce-ST2501-S20.00 ";

5 your choice-STOSOO-$7.00":10 your choice-ST1000-$12.00' .

_.------

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1I'L16.IYII

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_ OWNER REPAIR OF AMATEUR RADIO EQUIPMENT- BK7310-Frank Glass shares over 40 yea rs 01operati ng, servicing ,and design experience In this book. There are severa l books and numerous art icles ava ilable on the subjec t of repa irs 10 erectron tc equipment. The information within these books ranges from the elementary to the highly techn ica l written lor the topengineers in the f ield. But this book stands out from the rest In that it is written in narrative sty le a imed at conveyi ng the con.ceot of electronic servicing . A written discussion of how components work and how they are combined to prov ide communtca.non equipment is used to help the reader understand the concepts required to service station equ ipment. $7.95.'• A GUIDE TO HAM RADIO- BK7321- by Larry Kahaner WB2NEl. What's Amateur Radio all about ? You can learn the basicsof this fascinating hobby with t his excellent beginner'S guide. It answers the most frequently asked questions in an easy·goingmanner, and it shows the best way to go about ge tting an FCC l icense. A Guide to Ham Radio is an ideal introduction to a hobbyenjoyed by people around the wor ld. $4.95."• LIBRARY SHELF BOXES- These sturdy white, corrugated, dtrt -resrstant boxes each hold a full year of 730r «nooeuo u terocomputing. With your order , request sert-sucktnc labels lor any of the touowmc: 73, Kilooaud Microcomputing. CO, OST, HamRadio, Persona l Computing, Radio Electronics, Interface Age, and Byte. Order 1-BX1000-for $2.00" ; order 2-7-BX2002-forSl .5O each " ; order 8 or more-BX 1002-for $1.25 each" .

=====TEST EQUIPMENT= = = = = ......eRF AND DIGITAL TEST eQUIPMENT YOU CANBUILD- BK1044- Rf burst. tuncttcn . square wave qeneeatcre.var iable length pulse generators-100 kHz marker. i-I and rf sweepgenerators, aud io esc. allrf s ignal Injec tor, 146 MHz synthesizer,d igital readou ts for counters , several counters, cresceter.microwave meter, etc. 252 pages. $5.95. '

.VOL 1 COMPONENT TESTERS- LB7359- ... how 10 bu ildtransistor testers (8), d iode lesters (3), Ie testers (31. voltmetersand VTVMs (9), ohmmeters (8 d ifferent kinds), inductance (3).capacity (9) , a measurement, crystal checking (6), temperature (2),aural meters for the bl ind (3) and all sorts 01miscellaneous data onmeters . . . us ing them, making them more versat ile, making etanceres. Invaluable book. $4.95. '.VOL. II AUDIO FREQUENCY TESTERS-LB7360- .. . ja mpacked with a ll kinds of audio frequency test equipment. If you'reinto SSB, ATTY, SSTV, etc., this book Is a must for you ... a goodbook for hi-fi addicts and experimenters, too l $4.95.·

• VOL. III RADIO FREQUENCY TESTERS-LB7361-Radio frequency waves , the common denominator of Amateur Radio.Such Items as SWR, antenna impedance, line im pedance, rf output and field strength; detailed Instructions on testing theseItems includes sections on signal generators, crystal calibrators , grid dip oscillators, noise generators , dummy loads andmuch more. $4.95. •

_VOL IV IC TEST eQUIPMENT-LB7362- Become a troubleshooting wizard! In th is fourth volume of the 73 TEST EQUIp·MENT LIBRARY are 42 home construction projects for bu ilding test equ ipment to work with your ham station and in servic ingdigital equipment . Plus a cumulative index for all four volumes of the 73 TEST EQUIPMENT LIBRARY. $4.95.·

==TItE WELL-EQUipPEd ItAM sItAck= =.73 MAGAZINE BINDERS- Preserve and • HOW TO BUILD A MICROCOMPUTER-protect your collection for your lifetime! ,.. AND REALLY UNDERSTAND IT-BK7325There 's no excuse for lost issues when you ,. ~....!o_!l -. by Sam Creason. ~he~lectron ic.s hobby·have these handsome red binders with 1St who wants to ouuo his own .m lc r~om-gold lettering Order 1-BN100l-for puter system now has a practical H.ow·

•. . To" guidebook. Sam Creason 's book IS a$6.50: 2 or . more-BN1002-for $6.00 combination technical manual and pre.each . (specify 1978 or 1979 bmders) grammlng guide that takes the hobbyist• QSL CARDS - 73 turns out a fantastic step-by-step through thedesign, construe-series of OSL cards at about half the cost tion, testing and debugging of a completeof having them done elsewhere because microcomputer system. This book is mustthey are run as a f lll·in between printing reading for anyone desiring a true under-books and other items in the 73 Print Shop. standing of computer systems. $9.95.·250 Sty le W-QW0250-for $8.95·; 500Style W- QW0500- for $1 3.95· ; 250 Sty leX-OX0250-for $8.95· ; 500 Sty le XQX05OO-for $1 3.95· ; 250 Sty le Y-QY0250- for $8.95· ; 500 Sty le Y-OY0500-for$13.95.' ,- ......."

Use the order card in the back of this magazine or itemize your order on a separate piece o f paper and ma il to:73 Radio Bookshop • Peterborough NH 03458. Be sure to inc lude check or deta iled credi t card information.

"Add $1.00 handling charge. Note: Prices subjec t to change on books not published by 73 Magazine .

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22,650pages.

That's the size of the world'smost comprehensive guide tothe subject of ham radio:

I8 years of 73 Magazine.

The back issues of 73 are a gold mine of interesting articles. Unl ikethe other magazines, which fill their pages with activity reports,there 's little to go stale in 73. You'll find pioneering articles on SSTV,FM, repeaters, ICs, and computers. Even the editorials are fun asWayne Green 's dire predictions, like the debacle of incentive licensing , have come to pass.

Clip the coupon below and send for 73's new back issue catalogue.Treat yourself (or a friendly ham) to some fun, and a fantastic bargainto boot.

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k llob.ud MluCKomputlns ... andtor CQ. Q.ST. H. m I .d'o. Penon.I.l Computlns . a.dlo [lKtTonlc5,lntrrf..ce Ase. and Iytf'. Ask for whatever st ickersyou want with your box o rder. They hold a full year o f13 ... o r k llo b .....d MluoeDmpatlns _ Your m ag az ineJlbrary is your prim" ref erence. keep It hand y and keep itneat with t hese slrong library she l f boxes ... One b o x Is$2 .00 . Z boxes a re $3 .0 0 e nd e ight boxes are S 10.00. Besure t o speci f y wh ich labe ls we should send . Have yourcred i t ca rd handy and ce u our t oll -free o rder number800-258-5473 . o r use t he order card In the back o f thernegeztne and m<l ll t o :

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1\46 ABC Communications S<l.A' AdirondaCk R.d>O Supply_ 1661.2. Ad". Elect'on ics 186

Advance EI-.: I'onics, 97. ,.,"'60 AEO Electronics. . . . . . . . . . . • . . 10A2 AIdelc:<l.••..•••••.•.•...•••. 164

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AssocIated Radio 180AlIsnla HamFfllItival. 103

B23 Barke.W llllamson, 114842 Brod ie EIe<:lronics Company, _46ea Bunet Electronics 176, 117C88 C & A Electronic Enlefj)fis," ~

C3 Clegg 115C21 Coak'j . . . . . . . . . . . . . 14Cl06 Command Productions 123C58 CommunIcat ions Cante• .

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cial,. 132C89 Comm!.InteoltiOns Services 1I.C8 Communications Spec ia l .

ists 18, 11Cl05 Communications &. TV Unltd 62C9 Con tinental Specialties Corp, ,26C119 Cook Communications COrp.. 52D6 P9t ", W . o.~ I Compan y 11OlD O8.is ElectfOnics t47D3S o.ytapro Electronics. Inc 10020 Oiglla' Aesearch Corpora ·

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1001.1 , 29.47tn.tant SOl1w••e 84. 85. 89IntflQl'ated Circuits. Unttd, 185Jameco Elec1ronics 179Jan Crystals , 62.......wood. . . .. . • • • • . • . • . CIV.SKey Elect.on ics. . . . . . . . . . .. 95KllQCIlud 83KLM Electronics 94Long's Electronics, 12,(·129Macrot ronICs.lnc 132Madison Electron ics Sup, . 70. 147Maggiore Electronic Lab ... . . 10MFJ Enterprises, .. 33. • 2. 53, 130MHZ Electronics. . . • . . . . 170.171M,cro Control Specian'es 1«MKlland InternatiQnal. , 164JW. "WI", DiY. (8eI1 Indus.~ 2• . 60M &. M RF Distributors, 36Motorola . . . . . . 2!i

OS OK Mach ine & TOOl 25. 9\03 Optoelectronics. Inc , 1SOt2 OutdoOfOUtliU"'•. . . . . .. _ 132PIS Pace-Tfaps , •

Palomar Engl"",s. . . 145P31 Plnasonic . .. . . . 19PSI Patncom .. . . . . 26P., P.C, Elecl.on lCS 131P« Pickering Codemut.. Co_ 1. 7P.2 Plainsman MIC.o SyStems , 87P2 Poly Paks 1810 3 auest Electronics. . . . . 167I'll Radio Amal eur Callbooi<. 'nc. 183

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X3 Xilex , 130YI Yaeau mee. Corp CIII . 25. 27. 99From 13. . _ Psg&ll 131. 166-194

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13 DIPOLE & LONG WIRE ANTENNAS.• .• S 5.5073 BACK ISSUE•••••• .• ••.• . •• .• .•••••• .• $ 3.0073 BACK ISSUES-25 OUR CHOiCE••••.• $10.0073 BACK ISSUES-5 YOUR CHOiCE.•• ••• $ 7.0073 BACK ISSUES-10 YOUR CHOiCE•• •• • $12.0073 BACK ISSUES-25 YOUR CHOiCE••••• $20.00BEHIND THE DIAl. ..• .• .• .••.•.•.• .• . .• . $ 4.95BINDER-13-1 . •. •. •.••.•. •. •.•..•. •.•. $ 6.50BINDER-13-2&UP . •. • •... •. •.• •... •. • $ 6.00CHALLENGE OF 160. •. •.... •. •. •.... •. •. $ 4.95CODE TAPE-5 WPM • .. • .. .• .• . • . . • .• .• . $ 4.95CODE TAPE-6 + WPM.• •••• .• . • • . • . • .• . $ 4.95CODETAPE-10+ WPM •••••••.••.• .• .• . s 4.95CODETAPE-13+ WPM ••••••••••.•.•••• $ 4.95CODE TAPE-20 + WPM •• •• •••••• .• .•••• $ 4.95CODE TAPE-25 + WPM • .• .• ••• •• .• . • • . • $ 4.95CODE TAPES (ANY FOUR ABOVE)••••• •. • $15.95GUIDE TO HAM RADIO. •. •.• •••. •••.• •. • $ 4.95OWNER REPAIR OF AMATEUR RADIOEQUiPMENT . •. •. •.. •. •. •. •.. •. •. •. •..•. $ 1.95IC OP AMP COOKBOOK. .• •.• .• . . . . . .• .• $12.95INTRO TO RTTY•••••.• .••• •.• .• .• • . • .• .• $ 2.00NOVICE THEORY TAPES.. • .• .• . . • .• .• .• $15.95PROPAGATION WIZARD'S HANDBOOK. • $ 6.95QSL CARDS-STYLE W-250.•••.• .• . • .• $ 8.95QSL CARDS-STYLE W-5OO.••• .• . • . • • • $13.95

QX0250QXOSOOQY0250QY0500BK7345BK1044BK7347BXl000BX100lBX1002BK7351BK1354BK1355CT7350SG1081SG1080SG1358SG1357LB1359LB1360LB7361LB7362BK1069BK7368BK7370

QSL CARDS-STYLE X-250..•. •. •. •.•. • $ 8.95QSL CARDS-STYLE X- SOD• .• .• • .. • . . • • $13.95CSL CARDS-STYLE Y-250• . • . • • . . • . • • • $ 8.95QSL CARDS-STYLE Y-SOD•.• .• •. .• .• .• $13.95REPEATER ATLAS $ 1.95RF DIGITAL TEST EQUiPMENT. •. •. •. •. •. $ 5.95Rny HANDBOOK• . • .• . . • •• .• .• .• •• .•.•. $ 5.95SHELF BOX-l .. •... ...•. •. •. • .. • . . . • .. S 2.00SHELF BOX-2.. .. .• .• .• .•..•..• •••.•.. S 1.50SHELF BOX-8 UP• .• .•....•••••• •• ••••• S 1.25SSB THE MISUNDERSTOOD MODE•••••• S 5.50SSTV HANDBOOK (HARDCOVER)• •••••• • $ 1.00SSTV HANDBOOK (SOFTCOVER)• .••..•• S 5.00SSTV TAPE. ••••••• •.•• •. •.••••. •.• • ... • S 5.95STUDY GUIDE-ADVANCED CLASS• .• ..• $ 5.95STUDY GUIDE-EXTRA CLASS.•. •. •. •. •• S 5.95STUDY GUIDE-GENERAL CLASS. •. •• •• S 5.95STUDY GUIDE-NOVICE CLASS.•••. ••.• S 4.95TEST EQUIP LIB Vl-COMP TESTERS. •.• S 4.95TEST EQUIP LIB V2-AUDIO TESTERS.••• S 4.95TEST EQUIP LIB V3-RADIO EQUiP. •• • • •• S 4.95TEST EQUIP LIB V4-IC TEST EQUIP.•••.• S 4.95VERTICAL BEAM & TRIANGLE ANTNS. '" $ 5.50VHF ANTENNA HANDBOOK•. •. • • • • • • • • • S 4.95WEATHER SATELLITE HANDBOOK•• • .• . $ 4.95

~- Tra n sm jt Indicator

, -Channel BusV Lamp

___ Display On10 11

"t"-- Remo te Speaker /Mike Input

_Repeater/Simplex Offset Switch

,-Clear /Busy Auto Scan Selector

Keyboard Lock _ -,

Aud io Gain Cont roll---!c--

Squelch Control~~

BNC Antenna Connector

Keyboard Entry ------

5-Dig il LED Readout-- - - ---i

Condensor Mi ke - - "

••

The Yaesu FT-207R Synthesized Handiehas all the features you could want in a '1ery compact package

• 144-148 MHz Range • Keyboard Encoded Frequency Entry• 10 KHz Steps • 2 Tone (Touchtone®) Input from Keyboard• 3 Watts Output • Keyboard Lock guards against accidental• 4 Memories plus Programmable Offset frequency change• Priority Channel • Odd Splits Can Be Programmed from Keyboard• Memory and Band Auto Scan • Automatic Battery Saver Feature for LED Display• Optional Equipment: • Rubber Flex Antenna

Tone Squelch, Speaker /Mike, Nicads, Battery Charger

Price And Specifications Subject ToChange Withoul Notice OrObligation

679X

YAESU ELECTRONICS CORP., 15954 Downey Ave., Paramount, CA 90723 • (213) 633-4007YAESU ELECTRONICS Eastern Service Ctr.,9812 Princeton-Glendale Rd.,Cincinnati OH 45246

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