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Technician Licensing Class

This class covers topics including microphone connectors, using computers in amateur radio stations, regulated power supplies, filters for reducing harmonic emissions, in-line SWR meters, and more.

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Technician Licensing Class

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  1. Technician Licensing Class T 4 A - T 4 B Valid July 1, 2014 Through June 30, 2018

  2. T 4 A Some microphone connectors on amateur transceivers include push-to-talk and voltages for powering the microphone. T4A01 2

  3. T 4 A Computers might be used as part of an amateur radio station: For logging contacts and contact information For sending and/or receiving CW For generating and decoding digital signals All of these choices are correctT4A02 3

  4. T 4 A A good reason to use a regulated power supply for communications equipment is that it prevents voltage fluctuations from reaching sensitive circuits. T4A03 To reduce harmonic emissions from your station install a filter between the transmitter and the antenna.T4A04 4

  5. T 4 A An in-line SWR meter should be connected to monitor the standing wave ratio of the station antenna system in series with the feed line, between the transmitter and antenna.T4A05 5

  6. T 4 A A terminal node controller would be connected between a transceiver and computer in a packet radio station.T4A06 When conducting digital communications using a computer the sound card provides audio to the microphone input and converts received audio to digital form. T4A07 6

  7. T 4 A The flat strap type of conductor is the best to use for RF grounding. T4A08 Use a ferrite choke to cure distorted audio caused by RF current flowing on the shield of a microphone cable. T4A09 7

  8. T 4 A A source of a high-pitched whine that varies with engine speed in a mobile transceiver’s receive audio is the alternator. T4A10 The negative return connection of a mobile transceiver power cable should be connected at the battery or engine block ground strap. T4A11 If another operator reports a variable high-pitched whine on the audio from your mobile transmitter there is noise on the vehicle’s electrical system being transmitted along with your speech audio. T4A12 8

  9. T 4 B If a transmitter is operated with the microphone gain set too high the output signal might become distorted T4B01 A keypad or VFO knob can be used to enter the operating frequency on a modern transceiver. T4B02 The squelch control on a transceiver will mute the receiver output noise when no signal is being received. T4B03 KeyPad VFO 9

  10. Run Some Interference Protection Storing popular frequencies in a memory channel is a way to enable quick access to favorite frequencies on your transceiver.T4B04 To reduce ignition interference to a receiver turn on the noise blanker. T4B05 • Not on common FM handheld or mobile FM radios. • On bigger high-frequency, multi-mode transceiver. PreAmp built in NB – Noise Blanker 10

  11. T 4 B The receiver RIT or clarifier controls could be used if the voice pitch of a single-sideband signal seems too high or low. T4B06 “RIT” means Receiver Incremental Tuning. T4B07 11

  12. T 4 B The advantage of having multiple receive bandwidth choices on a multimode transceiver is that it permits noise or interference reduction by selecting a bandwidth matching the mode. T4B08 12

  13. T 4 B • 2400 Hz is an appropriate receive filter bandwidth to select in order to minimize noise and interference for SSB reception. T4B09 13

  14. T 4 B 500 Hz is an appropriate receive filter bandwidth to select in order to minimize noise and interference for CW reception. T4B10 14

  15. T 4 B The difference between the repeater’s transmit and receive frequencies is called “repeater offset”. T4B11 The function of automatic gain control or AGC is to keep received audio relatively constant. T4B12 Frequency RangeShift Direction 145.200-145.495 MHz Negative 146.610-146.995 MHz Positive 147.000-147.395 Mhz Positive 442.000-444.995 Mhz Positive 447.000-449.995 Mhz Negative 15

  16. Element 2 Technician Class Question Pool T 4 A – T 4 B Valid July 1, 2014 Through June 30, 2018

  17. T4A01Which of the following is true concerning the microphone connectors on amateur transceivers? All transceivers use the same microphone connector type Some connectors include push-to-talk and voltages for powering the microphone All transceivers using the same connector type are wired identically Un-keyed connectors allow any microphone to be connected 17

  18. T4A02How might a computer be used as part of an amateur radio station? For logging contacts and contact information For sending and/or receiving CW For generating and decoding digital signals All of these choices are correct 18

  19. T4A03Which is a good reason to use a regulated power supply for communications equipment? It prevents voltage fluctuations from reaching sensitive circuits A regulated power supply has FCC approval A fuse or circuit breaker regulates the power Power consumption is independent of load 19

  20. T4A04Where must a filter be installed to reduce harmonic emissions from your station? Between the transmitter and the antenna Between the receiver and the transmitter At the station power supply At the microphone 20

  21. T4A05Where should an in-line SWR meter be connected to monitor the standing wave ratio of the station antenna system? In series with the feed line, between the transmitter and antenna In series with the station’s ground In parallel with the push-to-talk line and the antenna In series with the power supply cable, as close as possible to the radio 21

  22. T4A06Which of the following would be connected between a transceiver and computer in a packet radio station? Transmatch Mixer Terminal node controller Antenna 22

  23. T4A07How is the computer’s sound card used when conducting digital communications using a computer? The sound card communicates between the computer CPU and the video display The sound card records the audio frequency for video display The sound card provides audio to the microphone input and converts received audio to digital form All of these choices are correct 23

  24. T4A08Which type of conductor is best to use for RF grounding? Round stranded wire Round copper-clad steel wire Twisted-pair cable Flat strap 24

  25. T4A09 Which of the following could you use to cure distorted audio caused by RF current flowing on the shield of a microphone cable? Band-pass filter Low-pass filter Preamplifier Ferrite choke 25

  26. T4A10What is the source of a high-pitched whine that varies with engine speed in a mobile transceiver’s receive audio? The ignition system The alternator The electric fuel pump Anti-lock braking system controllers 26

  27. T4A11Where should the negative return connection of a mobile transceiver’s power cable be connected? At the battery or engine block ground strap At the antenna mount To any metal part of the vehicle Through the transceiver’s mounting bracket 27

  28. T4A12What could be happening if another operator reports a variable high-pitched whine on the audio from your mobile transmitter? Your microphone is picking up noise from an open window You have the volume on your receiver set too high You need to adjust your squelch control Noise on the vehicle’s electrical system is being transmitted along with your speech audio 28

  29. T4B01What may happen if a transmitter is operated with the microphone gain set too high? The output power might be too high The output signal might become distorted The frequency might vary The SWR might increase 29

  30. T4B02Which of the following can be used to enter the operating frequency on a modern transceiver? The keypad or VFO knob The CTCSS or DTMF encoder The Automatic Frequency Control All of these choices are correct 30

  31. T4B03What is the purpose of the squelch control on a transceiver? To set the highest level of volume desired To set the transmitter power level To adjust the automatic gain control To mute receiver output noise when no signal is being received 31

  32. T4B04What is a way to enable quick access to a favorite frequency on your transceiver? Enable the CTCSS tones Store the frequency in a memory channel Disable the CTCSS tones Use the scan mode to select the desired frequency 32

  33. T4B05Which of the following would reduce ignition interference to a receiver? Change frequency slightly Decrease the squelch setting Turn on the noise blanker Use the RIT control 33

  34. T4B06Which of the following controls could be used if the voice pitch of a single-sideband signal seems too high or low? The AGC or limiter The bandwidth selection The tone squelch The receiver RIT or clarifier 34

  35. T4B07What does the term "RIT" mean? Receiver Input Tone Receiver Incremental Tuning Rectifier Inverter Test Remote Input Transmitter 35

  36. T4B08 What is the advantage of having multiple receive bandwidth choices on a multimode transceiver? Permits monitoring several modes at once Permits noise or interference reduction by selecting a bandwidth matching the mode Increases the number of frequencies that can be stored in memory Increases the amount of offset between receive and transmit frequencies 36

  37. T4B09Which of the following is an appropriate receive filter bandwidth to select in order to minimize noise and interference for SSB reception? 500 Hz 1000 Hz 2400 Hz 5000 Hz 37

  38. T4B10Which of the following is an appropriate receive filter bandwidth to select in order to minimize noise and interference for CW reception? 500 Hz 1000 Hz 2400 Hz 5000 Hz 38

  39. T4B11Which of the following describes the common meaning of the term “repeater offset”? The distance between the repeater’s transmit and receive antennas The time delay before the repeater timer resets The difference between the repeater’s transmit and receive frequencies To match the antenna impedance to the feed line impedance 39

  40. T4B12 What is the function of automatic gain control or AGC? To keep received audio relatively constant To protect an antenna from lightning To eliminate RF on the station cabling asymmetric goniometer control used for antenna matching 40

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