ELEMENT 2 SUB-ELEMENTS Technician Licensing ...ecee.colorado.edu/~mathys/ecen2420/pdf/TechnicianLicense/T8slides... · Technician Licensing ClassTechnician Licensing Class Supplement

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Technician Licensing ClassTechnician Licensing Class

Supplement T8

Modulation ModesModulation Modes

4 Exam Questions, 4 Groups

Amateur Radio Technician ClassEl t 2 C P t tiElement 2 Course Presentation

ELEMENT 2 SUB-ELEMENTS

– T1 - FCC Rules, descriptions and definitions for the amateur radio service, operator and station license responsibilities.T2 – Operating Procedures– T2 – Operating Procedures

– T3 – Radio wave characteristics, radio and electromagnetic properties, propagation modes

– T4 – Amateur radio practices and station set up– T5 – Electrical principles, math for electronics, electronic principles,T5 Electrical principles, math for electronics, electronic principles,

Ohm’s Law– T6 – Electrical components, semiconductors, circuit diagrams,

component functions– T7 – Station equipment, common transmitter and receiver problems,

t t d t bl h ti b i i d t tiantenna measurements and troubleshooting, basic repair and testing– T8 – Modulation modes, amateur satellite operation, operating activities,

non-voice communications– T9 – Antennas, feedlines– T0 – AC power circuits antenna installation RF hazards

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– T0 – AC power circuits, antenna installation, RF hazards

T8A: Modulation modes; bandwidth of various signals

• T8A1 Single sideband is a form of amplitude modulation.

Voice or Phone Station

Carrier only CW Tones produce both Remove one sideband and suppress carrier

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side bands or AM and suppress carrier becomes SSB


– T8A2 FM is the type of modulation most commonly used for VHFT8A2 FM is the type of modulation most commonly used for VHF packet radio transmissions.

– T8A3 SSB is the type of voice modulation most often used for long-distance or weak signal contacts on the VHF and UHF bands.

– T8A4 FM is the type of modulation most commonly used for VHF and UHF voice repeatersand UHF voice repeaters.

– T8A5 CW is the type of emission that has the narrowest bandwidth.

Th id b d ll d f 10 HF VHF d UHF– T8A6 The sideband normally used for 10 meter HF, VHF and UHF single-sideband communications is upper sideband.

– Upper sideband is always used on VHF & UHF

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Upper sideband is always used on VHF & UHF


– T8A7 The primary advantage of single sideband over FM for voiceT8A7 The primary advantage of single sideband over FM for voice transmissions is that SSB signals have narrower bandwidth.

– SSB uses less bandwidth than FM signals.

– T8A8 3 kHz is the approximate bandwidth of a single sideband voice signal.

55SSB signals are Amplitude Modulated (AM) with

the carrier and one sideband suppressed.

T8A: Modulation modes; bandwidth of various signals; g

– T8A9 The approximate bandwidth of a VHF repeater FM phone signal is between 5 and 15 kHzsignal is between 5 and 15 kHz.

– T8A10 The typical bandwidth of analog fast-scan TV transmissions on the 70 cm band about 6 MHz.

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Amateur TV signals can be received on a variety of equipment – even a small hand-held monitor.

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– T8A11 150 Hz is the approximate maximum bandwidth required toT8A11 150 Hz is the approximate maximum bandwidth required to transmit a CW signal.

CW Signal 500 Hz wideSSB Signal 2 - 3 kHz wideFM Si al 5 15 kH ideFM Signal 5 - 15 kHz wideUHF Fast-Scan TV ~ 6 MHz

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T8B: Amateur satellite operation; Doppler shift, basic orbits, operating protocols.

– T8B1 Any amateur whose license privileges allow them to transmit on the satellite uplink frequency may be the control operator of a stationthe satellite uplink frequency may be the control operator of a station communicating through an amateur satellite or space station.

– T8B2 The minimum amount of power needed to complete the contact is how much transmitter power should be used on the uplink frequencyhow much transmitter power should be used on the uplink frequency of an amateur satellite or space station.

– Just a repeat of previous mention about amount of power output

88To work satellites with your handheld, buy a small directional antenna for your

satellite radio. You probably won’t hear much with your rubber duck antenna.


• T8B3 Talking to amateur radio operators in other countries can be d i t di t llitdone using an amateur radio satellite.

• T8B4 Any amateur holding a Technician or higher class license may make contact with an amateur station on the International Space pStation using 2-meter and 70 cm band amateur radio frequencies.

The International Space Station

downlink, FM is 145.800 MHz. Use

an HT to listen when it’s passing

over you.

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International Space Station has a big ham station on board.

Many Astronaults are licensed radio amateurs.


A t llit b i t i i f t ti th t• T8B5 A satellite beacon is a transmission from a space station that contains information about a satellite.

• T8B6 A satellite tracking program can be used to determine the g p gtime period during which an amateur satellite or space station can be accessed.

Computer programs and websites can show you where and when an amateur satellite or the Space Station will be in range of your ham

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range of your ham station.


– T8B7 With regards to satellite communications Doppler shift is a change in signal frequency caused by relative motion between the satellitein signal frequency caused by relative motion between the satellite and the earth station.

Doppler Effect

– T8B8 The statement that a satellite is operating in "mode U/V" means that the satellite uplink is in the 70 cm band and the downlink is in the 2 meter band.

Frequency Bands Frequency Range ModesHigh Frequency 21 - 30 MHz Mode HVHF 144 - 146 MHz Mode VUHF 435 - 438 MHz Mode UL band 1.26 - 1.27 GHz Mode L

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L band 1.26 1.27 GHz Mode LS band 2.4 - 2.45 GHz Mode SC band 5.8 GHz Mode CX band 10.4 GHz Mode XK band 24 Ghz Mode K


– T8B9 Rotation of the satellite and its antennas causes "spin fading"T8B9 Rotation of the satellite and its antennas causes spin fading when referring to satellite signals.

– Rotation in space makes the signals fade in and out.Thi t ti k l l f h ti– This rotation keeps solar panels from overheating.

Tracking and communicating through t t llit b d ith

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amateur satellites can be done with a cross-polarized satellite antenna

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– T8B10 The initials LEO tell you an amateur satellite is in a Low Earth OrbitOrbit.

Orbiting Satellites

– T8B11 A commonly used method of sending signals to and from a digital satellite is FM Packet.

– FM packet a very popular digital communications system

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FM packet a very popular digital communications system– Packets usually stored and forwarded, via satellite or space station

T8C: Operating activities; radio directing finding, radio control, contests, special event stations, basic linking over Internetbasic linking over Internet

– T8C1 Radio direction finding methods are used to locate sources of i i t f j inoise interference or jamming.

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2-element Yagi DF Antenna 3-element Quad DF Antenna


• T8C2 A directional antenna would be useful for a hidden• T8C2 A directional antenna would be useful for a hidden transmitter hunt.

Hidden Transmitter Hunts are called Fox Hunting

All ages participate in a Fox Hunt

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All ages participate in a Fox Hunt


– T8C3 Contesting is a popular operating activity that involves contacting as t ti ibl d i ifi d i d f timany stations as possible during a specified period of time.

Field Day Every June Enjoyed By Hams the World Over

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T8C4 A good procedure when contacting another station in a radio g p gcontest is to send only the minimum information needed for proper identification and the contest exchange.

Chit chat is great forChit chat is great for normal QSO’s, but not for contests.

Contesting needs your call sign and info for contest

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sign and info for contest only.


– T8C5 A grid locator is a letter-number designator assigned to a geographic location.

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– T8C6 The purpose of a temporary "1 by 1" format (letter-number-letter) assigned call sign is for operations in conjunction with an activity ofassigned call sign is for operations in conjunction with an activity of special significance to the amateur community.

– W5P N3G W9I

– T8C7 The maximum power allowed when transmitting– T8C7 The maximum power allowed when transmitting telecommand signals to radio controlled models is 1 watt.• Telecommand signals are unidentified commands permitted by rule.

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Hams can use frequencies on the 6-Meter Band to radio control a model aircraft.


– T8C8 It is required that a label indicating the licensee's name, call sign and address must be affixed to the transmitter in place of on airsign and address must be affixed to the transmitter in place of on-air station identification when sending signals to a radio control model using amateur frequencies.

– Strange radio control signals can be heard using RC:Strange radio control signals can be heard using RC: » 50.800 to 51.0 MHz and 53.1 to 53.9 MHz.

50 MHz 54 MHz

6-Meter Wavelength Band Privileges

52 MHz

Privileges51 MHz 53.1 MHz 53.9 MHz

2020

Licensee’s call sign


– T8C9 You might obtain a list of active nodes that use VoIP from a repeater directoryrepeater directory.

– The Internet is your best source. (But this is the question for the exam.)

– T8C10 You can select a specific IRLP node when using a portable transceiver by use of the keypad to transmit the IRLP node ID.

Keypad on this rig’s top corner and on back of microphone. (Not

– T8C11 A gateway is the name given to an amateur radio station that is used to connect other amateur stations to the Internet.

p (necessarily this way on all rigs.)

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– Similar to a Gateway in connection to a computer network

T8D: Non‐voice communications; image data, digital modes CW, packet, PSK31

– T8D1 The following are examples of digital communications methodsmethods.

PacketPSK31MFSK.

– T8D2 The term APRS means Automatic Position Reporting System.

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Kenwood dual bander plugged into the Avmap G5 GPS position plotter.


– T8D4 The type of transmission indicated by the term NTSC is anT8D4 The type of transmission indicated by the term NTSC is an analog fast scan color TV signal.

2323When you’re ready, you can add the fun of ATV to your ham shack.


– T8D5 Data emission modes may be used by a Technician ClassT8D5 Data emission modes may be used by a Technician Class operator between 219 and 220 MHz.

» 219 to 220 MHz for point-to-point digital message forwarding

222 MHz 225 MHz

223.50 MHz

219 MHz 220 MHz

1.25‐Meter Wavelength Band Privileges

– T8D6 The abbreviation PSK mean Phase Shift Keying.

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– T8D7 PSK31 is a low-rate data transmission mode.• PSK-31 transmission rate is about normal typing speed.• PSK is a remarkable digital mode that slices through interference and gets

message across sometimes to the moon and back.

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You can connect a PSK-31 and RTTY data reader to your radio to decode messages


– T8D8 Packet transmissions may include:T8D8 Packet transmissions may include:A check sum which permits error detection;A header which contains the call sign of the station to which the information is being sent;g ;Automatic repeat request in case of error.

Laptop, TNC, and

Handheld comprise

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comprise Packet

Station.


– T8D9 The code used when sending CW in the amateur bands isT8D9 The code used when sending CW in the amateur bands is International Morse.

– T8D10 The following devices can be used to transmit CW in the amateur bands:

Straight KeyElectronic KeyerComputer Keyboard

– T8D11 A "parity" bit is an extra code element used to detect errorsT8D11 A parity bit is an extra code element used to detect errors in received data.

» Just like a ‘parity bit’ in computers

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Element 2 Technician Class Question Pool

T8Modulation modes; amateur satellite operation, operating activities, non‐voice communications

[4 Exam Questions – 4 Groups]

Valid July 1 2010Valid July 1, 2010

Through

June 30, 2014

T8A01 Which of the following is a form ofT8A01 Which of the following is a form of amplitude modulation?

A. Spread-spectrumB. Packet radioC. Single sidebandD. Phase shift keyingy g

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T8A02 What type of modulation is most commonlyT8A02 What type of modulation is most commonly used for VHF packet radio transmissions?

A. FMB. SSBC. AMD. Spread Spectrump p

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T8A03 Which type of voice modulation is most ypoften used for long-distance or weak signal

contacts on the VHF and UHF bands?

A. FMB. AMC. SSBD. PM

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T8A04 Which type of modulation is mostT8A04 Which type of modulation is most commonly used for VHF and UHF

voice repeaters?

A. AMB. SSBC. PSKD. FM

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T8A05 Which of the following types of emissionT8A05 Which of the following types of emission has the narrowest bandwidth?

A. FM voiceB. SSB voiceC. CWD. Slow-scan TV

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T8A06 Which sideband is normally used for 10T8A06 Which sideband is normally used for 10 meter HF, VHF and UHF single-sideband

communications?

A. Upper sidebandB. Lower sidebandC. Suppressed sidebandD. Inverted sideband

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T8A07 What is the primary advantage of singleT8A07 What is the primary advantage of single sideband over FM for voice transmissions?

A. SSB signals are easier to tuneB. SSB signals are less susceptible to g p

interferenceC. SSB signals have narrower bandwidthD. All of these choices are correct

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T8A08 What is the approximate bandwidth of aT8A08 What is the approximate bandwidth of a single sideband voice signal?

A. 1 kHzB. 3 kHzC. 6 kHzD. 15 kHz

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T8A09 What is the approximate bandwidth of aT8A09 What is the approximate bandwidth of a VHF repeater FM phone signal?

A. Less than 500 HzB. About 150 kHzC. Between 5 and 15 kHzD. Between 50 and 125 kHz

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T8A10 What is the typical bandwidth ofT8A10 What is the typical bandwidth of analog fast-scan TV transmissions on

the 70 cm band?

A. More than 10 MHzB. About 6 MHzC. About 3 MHzD. About 1 MHz

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T8A11 What is the approximate maximum ppbandwidth required to transmit a

CW signal?

A. 2.4 kHzB. 150 HzC. 1000 HzD. 15 kHz

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T8B01 Who may be the control operator of a y pstation communicating through an amateur

satellite or space station?A Onl an Amate r E tra Class operatorA. Only an Amateur Extra Class operatorB. A General Class licensee or higher licensee

who has a satellite operator certificationwho has a satellite operator certificationC. Only an Amateur Extra Class operator who

is also an AMSAT memberis also an AMSAT memberD. Any amateur whose license privileges allow

them to transmit on the satellite uplinkthem to transmit on the satellite uplink frequency

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T8B02 How much transmitter power should beT8B02 How much transmitter power should be used on the uplink frequency of an amateur

satellite or space station?

A. The maximum power of your transmitterB. The minimum amount of power needed to

complete the contactC. No more than half the rating of your linear

amplifierD. Never more than 1 watt

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T8B03 Which of the following can be done usingT8B03 Which of the following can be done using an amateur radio satellite?

A. Talk to amateur radio operators in other countries

B. Get global positioning informationC. Make telephone callsD. All of these choices are correct

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T8B04 Which amateur stations may make contact with anT8B04 Which amateur stations may make contact with an amateur station on the International Space Station

using 2 meter and 70 cm ban amateur radio frequencies?

A. Only members of amateur radio clubs at NASA facilities

i i iB. Any amateur holding a Technician or higher class license

C Only the astronaut's family membersC. Only the astronaut s family members who are hams

D. You cannot talk to the ISS on amateur radio frequencies

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T8B05 What is a satellite beacon?T8B05 What is a satellite beacon?

A. The primary transmit antenna on the satellite

B. An indicator light that that shows where to point your antenna

C. A reflective surface on the satelliteD. A transmission from a space station that

contains information about a satellite

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T8B06 What can be used to determine the time period during which an amateur satellite or

space station can be accessed?A. A GPS receiverB. A field strength metergC. A telescopeD. A satellite tracking programg p g

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T8B07 With regard to satellite communications, g

what is Doppler shift?

A. A change in the satellite orbitB. A mode where the satellite receives signals on

b d d i hone band and transmits on anotherC. An observed change in signal frequency

caused by relative motion between the satellitecaused by relative motion between the satellite and the earth station.

D. A special digital communications mode for p gsome satellites

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T8B08 What is meant by the statement that aT8B08 What is meant by the statement that a satellite is operating in "mode U/V"?

A. The satellite uplink is in the 15 meter band and the downlink is in the 10 meter band

B. The satellite uplink is in the 70 cm band and the downlink is in the 2 meter band

C. The satellite operates using ultraviolet frequencies

D. The satellite frequencies are usually variable

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T8B09 What causes "spin fading" when referringT8B09 What causes spin fading when referring to satellite signals?

A. Circular polarized noise interference radiated from the sun

B. Rotation of the satellite and its antennasC. Doppler shift of the received signalD. Interfering signals within the satellite uplink

band

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T8B10 What do the initials LEO tell you about an yamateur satellite?

A. The satellite battery is in Low Energy Operation mode

B. The satellite is performing a Lunar Ejection Orbit maneuver

C. The satellite is in a Low Earth OrbitD. The satellite uses Light Emitting Optics

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T8B11 What is a commonly used method ofT8B11 What is a commonly used method of sending signals to and from a digital satellite?

A. USB AFSKB. PSK31C. FM PacketD. WSJTJ

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T8C01 Which of the following methods is usedT8C01 Which of the following methods is used to locate sources of noise interference

or jamming?

A. EcholocationB. Doppler radarppC. Radio direction findingD. Phase lockingg

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T8C02 Which of these items would be useful for aT8C02 Which of these items would be useful for a hidden transmitter hunt?

A. Calibrated SWR meterB. A directional antennaC. A calibrated noise bridgeD. All of these choices are correct

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T8C03 What popular operating activity involvesT8C03 What popular operating activity involves contacting as many stations as possible

during a specified period of time?

A. ContestingB. Net operationspC. Public service eventsD. Simulated emergency exercisesg y

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T8C04 Which of the following is goodT8C04 Which of the following is good procedure when contacting another

station in a radio contest?

A. Be sure to sign only the last two letters of your call if there is a pileup calling the stationstation

B. Work the station twice to be sure that you are in his logg

C. Send only the minimum information needed for proper identification and the contest exchangecontest exchange

D. All of these choices are correct

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T8C05 What is a grid locator?T8C05 What is a grid locator?

A. A letter-number designator assigned to a geographic location

B. A letter-number designator assigned to an azimuth and elevation

C. An instrument for neutralizing a final amplifier

D. An instrument for radio direction finding

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T8C06 For what purpose is a temporary p p p y"1 by 1" format (letter-number-

letter) call sign assigned?

A. To designate an experimental stationB. To honor a deceased relative who was a

radio amateurC. For operations in conjunction with an

activity of special significance to the amateur community


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T8C07 What is the maximum power allowed when ptransmitting telecommand signals to radio

controlled models?

A. 500 milliwattsB. 1 wattC. 25 wattsD. 1500 watts

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T8C08 What is required in place of on‐air stationT8C08 What is required in place of on air station identification when sending signals to a radio

control model using amateur frequencies?A. Voice identification must be transmitted everyA. Voice identification must be transmitted every

10 minutesB. Morse code ID must be sent once per hourC. A label indicating the licensee's name, call sign

and address must be affixed to the transmitterD A fl b ffi d h iD. A flag must be affixed to the transmitter antenna

with the station call sign in 1 inch high letters or largerlarger

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T8C09 How might you obtain a list of active nodesT8C09 How might you obtain a list of active nodes that use VoIP?

A. From the FCC RulebookB. From your local emergency coordinatory g yC. From a repeater directoryD. From the local repeater frequency p q y

coordinator

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T8C10 How do you select a specific IRLP nodeT8C10 How do you select a specific IRLP node when using a portable transceiver?

A. Choose a specific CTCSS toneB. Choose the correct DSC toneC. Access the repeater autopatchD. Use the keypad to transmit the IRLP yp

node ID

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T8C11 What name is given to an amateur radioT8C11 What name is given to an amateur radio station that is used to connect other

amateur stations to the Internet?

A. A gatewayB. A repeaterpC. A digipeaterD. A beacon

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T8D01 Which of the following is an example of aT8D01 Which of the following is an example of a digital communications method?

A. PacketB. PSK31C. MFSKD. All of these choices are correct

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T8D02 What does the term APRS mean?T8D02 What does the term APRS mean?

A. Automatic Position Reporting SystemB. Associated Public Radio StationC. Auto Planning Radio Set-upD. Advanced Polar Radio Systemy

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T8D03 Which of the following is normally usedT8D03 Which of the following is normally used when sending automatic location reports

via amateur radio?

A. A connection to the vehicle speedometer

B. A WWV receiverC. A connection to a broadcast FM sub-

carrier receiverD. A Global Positioning System receiver

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T8D04 What type of transmission is indicated byT8D04 What type of transmission is indicated by the term NTSC?

A. A Normal Transmission mode in Static Circuit

B. A special mode for earth satellite uplinkC. An analog fast scan color TV signalD. A frame compression scheme for TV

signals

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T8D05 Which of the following emission modes gmay be used by a Technician Class

operator between 219 and 220 MHz?

A. Spread spectrumB. DataC. SSB voiceD. Fast-scan television

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T8D06 What does the abbreviation PSK mean?T8D06 What does the abbreviation PSK mean?

A. Pulse Shift KeyingB. Phase Shift Keyingy gC. Packet Short KeyingD. Phased Slide Keyingy g

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T8D07 What is PSK31?T8D07 What is PSK31?

A. A high-rate data transmission modeB. A method of reducing noise g

interference to FM signalsC. A method of compressing digital

television signalD. A low-rate data transmission mode

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T8D08 Which of the following may be included in g ypacket transmissions?

A. A check sum which permits error detection

i i i fB. A header which contains the call sign of the station to which the information is being sentbeing sent

C. Automatic repeat request in case of error


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T8D09 What code is used when sending CW in theT8D09 What code is used when sending CW in the amateur bands?

A. BaudotB. HamminggC. International MorseD. Grayy

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T8D10 Which of the following can be used toT8D10 Which of the following can be used to transmit CW in the amateur bands?

A. Straight KeyB. Electronic KeyeryC. Computer KeyboardD. All of these choices are correct

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T8D11 What is a "parity" bit?T8D11 What is a parity bit?

A. A control code required for automatic position reporting

i i iB. A timing bit used to ensure equal sharing of a frequency

C An extra code element used to detectC. An extra code element used to detect errors in received data

D. A "triple width" bit used to signal the p gend of a character

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ELEMENT 2 SUB-ELEMENTS Technician Licensing ...ecee.colorado.edu/~mathys/ecen2420/pdf/TechnicianLicense/T8slides... · Technician Licensing ClassTechnician Licensing Class Supplement

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