Pae 2750m Drive Unit User Guide

2750M Drive UnitUser GuideIssue 2Part Number 31-3275DUSAFreq 118.250 MHzHandbook Title: 2750M Drive Unit User GuideHandbook Part Number: 31-3275DUSAIssue Number: 2Date of Issue: March 2001Published By: Park Air ElectronicsNorthfieldsMarket DeepingPeterboroughEngland PE6 8UETelephone: From UK, 01778 345434From outside UK, 44 1778 345434Fax: From UK, 01778 342877From outside UK, 44 1778 342877www.parkair.co.ukPage 2 2750M Drive UnitAmendment RecordAmendments to this user guide, initiated by PAE, are recorded in the following table.AmendmentNumberIncorporatedby:Date Brief DetailsModification RecordModifications to the 2750M drive unit, authorized by PAE, are recordedin the following table.ModificationNumberEmbodied by: Date Brief Details1 PAE April 00Retainingclipremovedfromac mains connector. Changenote 3818 refers.2750M Drive Unit Page3Customer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .EQUIPMENT DETAILSPAE works order number (Cxxxxx or Mxxxxx) . . . . . . . . . . . . . . . . . . . . . . . . . . .Equipment model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Equipment serial number . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .SERVICE DETAILSCommissioning date . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Failure/repair date . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Supply voltage ac/dc . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*Transmitter keying: Continuous / approx 50% / occasional use*Equipment environment: Office area / dedicated equipment room / heated / air-conditioned[*Delete as applicable]FAULT DETAILSSymptoms of fault . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Results of any tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Any repairs carried out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Comments/action requested . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Name . . . . . . . . . . . . . . . . . . . . . . . .Department . . . . . . . . . . . . . . . . . . . . .Telephone . . . . . . . . . . . . . . . . . . . . . .Fax . . . . . . . . . . . . . . . . . . . . . . . . .Email . . . . . . . . . . . . . . . . . . . . . . . . .Page 4 2750M Drive UnitFault ReportTo ensure that PAE continues to offer the highest level of after sales service, it is necessary to gatheras much information as possible about equipment faults. In the event of an equipment fault, or failure,please complete a copy of this report and return it to the Customer Services Department at PAE.2750M Drive Unit Page5ContentsIntroduction 7General Information 7Front Panel Display 7Operating Modes 8Local Operation 8Remote Operation 8Use Within a MARC System 8Built-In Test (BIT) Indications 9Part Number and Model Identification 9Part Number 9Model Identification 9Specification 11General Characteristics 11RF and Modulation Characteristics 11Interfaces 12Dimensions and Weight 12Operating Instructions 13Introduction 13Front Panel Controls, Indicators and Connectors 13AC Power Switch 13DC Power Switch 13Control Panel 14Alarm Indicator 15Freq Socket 15Rear Panel 16AC Input Connector (CN5) 16DC Input Connector (CN4) 16Fuse F1 16RF Drive (CN2) 16Facilities Connector (CN3) 16Facilities Connector (CN7) 16Chassis Stud 16L.O. Drive 16Page 6 2750M Drive UnitOperation 17Power Up 17Local Operation 17Remote Operation 17Changing the Operating Frequency 18Frequency Display Readout 18Using the BIT Information Page 19To Initiate a BIT Interruptive Test 19To Set the Drive Units Frequency Standard: 20Setting the Operating Frequency when using Offset Carrier Systems 21Installation 23Preliminary Checks 23Mechanical Installation 23Telescopic Slides 23Fixed Runners 23External Connections 24AC Voltage Selection 24Supply Fuses 26AC Input Connection 26DC Input Connection 27Connecting the Chassis Stud to Earth 27RF Drive Connection 28Facilities Connector CN3 28Facilities Connector CN7 29IntroductionGENERAL INFORMATIONThe Park Air Electronics (PAE) type 2750Mdrive unit is a fully synthesised multi-frequency unit designedto provide the carrier frequency for a 2750SA transmitter.Bysettingthefront panel controls, theunit canprovideany25kHzspacedchannel frequencyfrom118.000 to 136.975 MHz. Additionally, the drive unit supports 2, 3, 4, or 5-offset carrier systems.The unit fits into a standard 483 mm(19 inch) equipment rack on either fixed runners or telescopic slides.It is powered froma standard ac input supply, or froma lowvoltage dc supply. When both ac and dc inputsuppliesareconnected,operationfromtheacsupplytakespriority;automaticchange-overtothedcsupplyoccursif theacsupplyfails. Onrestorationof theacsupply, theequipment revertstoacoperation.FRONT PANEL DISPLAYA Liquid Crystal Display (LCD) is fitted to the drive units front panel. By using the display and associatedcontrol switches, four information/control pages can be selected:2750M Drive Unit Page7Page 4. Allows the user to adjust the drive unitsfrequency standard.Page 3. Allows the drive frequency to be changed.Page 2. Accesses the Built-In Test facilities.Page 1. Shows the current drive frequency.Freq 118.250 MHzOPERATING MODESThe drive units can be operated in local or remote mode, or as part of a PAE MARC system. The variousoperating modes are described in the following paragraphs.Local OperationIn local operation the drive frequency can be changed using the front panel Liquid Crystal Display (LCD)and control keys. Additionally, BIT status can be seen and an interruptive BIT test can be initiated.Remote OperationForremoteoperation,inputandoutputsignalsareavailablefromthedriveunitsrearpanel Facilitiesconnector CN3. Thesesignals canberoutedtotheusers control equipment throughasuitablecommunication link. The signals include:qA 600 ohm balanced audio inputqTape outputqTx signalqNormal/wideband select signalqWideband audio inputqExternal PTTqBIT alarms (2750SA transmitter and drive unit alarms)qVarious Built-in Test (BIT) indications (included as part of the serial data)qRemote frequency change signals (included as part of the serial data).Use Within a MARC SystemThe PAE Multi-Access Remote Control (MARC) systemprovides monitoring and control of amulti-stationradiosystem.AtypicalMARCsystemcomprisesanumberofremoteradiositesthatareoperatedfromanAirTrafficControl(ATC)centre.AttheATC,aPersonalComputer(PC)actsastheMARCuser interface. All MARCfunctions are monitored and controlled fromgraphical screensdisplayed on the PC.When used in a MARC system the drive units BIT information and other facilities are interfaced with theMARC Remote Site Equipment (RSE). In addition, the associated 2750SA transmitters BIT information,audio, and other facilities are interfaced with the MARC RSE via the drive unit. When the drive unit andtransmitter are configured in this way, the operating frequency can be changed and an interruptive BITtestcanbeinitiatedfromagraphical representationofthetransmitteranddriveunitdisplayedontheMARCs PC. Additionally, the systemmonitors the continuous BIT information so that specifictransmitter and drive unit faults are displayed at the PC.Further details of the facilities provided by MARC are shown in the MARC User Guide.Page 8 2750M Drive UnitBUILT-IN TEST (BIT) INDICATIONSThedriveunit hastwolevelsof Built-InTests(BIT): Continuousmonitoringandaninterruptivetest.Some critical test points are continuously monitored during operation. These are, synthesiser lock, RFdriveandtransmitterpowersupplystatus.Ifa synthesiserlockorRFdrivefaultisdetected,thefrontpanel Alarm indicator lights. Faulty parameters can be identified using the front panel keys to scroll theBIT results. If a transmitter power supply failure is detected the Alarmindicator flashes on the drive unit.Whenaninterruptivetest isinitiatedtheTXindicatoronthe2750SAtransmitterlights. If afailureisdetectedthetransmitterAlarmlampilluminatesandthefailedparametercanbedeterminedfromthefrontpanel,orremotelyviatheMARCPCscreen(ifused).Transmitterparametersmonitoredviathetransmitter front panel meter includeforwardpower, VSWRandunregulatedvoltage. If afault isdetected, the drive unit Alarm lamp lights.PART NUMBER AND MODEL IDENTIFICATIONPart NumberThe PAE part number for the drive unit is:B2750DUModel IdentificationEach drive unit has a model identification label fitted to one of the chassis side panels. An example labelis illustrated below.2750M Drive Unit Page9PARK AIR ELECTRONICSPAEModel 2750DUDrive UnitSerial No1234 Option: -Volts 240 Watts 75The drive units acpower consumptionIdentifies any optionsfitted to the drive unitSetting of the mainsinput voltage link (whendispatched from PAE)The drive unitsserial numberPAE model numberIntentionally BlankPage 10 2750M Drive UnitSpecificationGENERAL CHARACTERISTICSThe general characteristics of the 2750M drive unit are:Frequency range 118.000 to 136.975 MHzChannel spacing 25 kHzFrequency temperature stability better than 0.3 ppm (-20 to +55C)Frequency ageing better than 0.75 ppm per yearFrequency step size 2.5 kHzFrequency change time