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T4B02

AMATEUR RADIO PRACTICES · Operating controls: frequency tuning, use of filters, squelch function, AGC, memory channels, noise blanker, microphone gain, receiver incremental tuning (RIT), bandwidth selection, scanning function; Digital transceiver configuration; DMR code plugs and talk groups

T4B02T4B →

Which of the following can be used to enter a transceiver's operating frequency?

  1. AThe keypad or VFO knob
  2. BThe CTCSS or DTMF encoder
  3. CThe Automatic Frequency Control
  4. DAll these choices are correct
Why Frequency entry on a modern transceiver is done either by typing the digits directly on the front-panel or microphone keypad, or by turning the VFO (variable frequency oscillator) knob to tune up and down the band. Both methods set the same thing: the VFO frequency the radio transmits and receives on. Memory channels are a third way, but they just recall a frequency that was entered by one of these methods.
Watch out CTCSS and DTMF encoders generate subaudible or touch-tone tones for repeater access and control, and automatic frequency control makes small corrections to hold a signal centered, so none of them let you choose an operating frequency.
Type it on the keypad or spin the VFO knob. Tones and AFC do not pick the frequency.
HamSandwich explanation, first draft. The question and answers are the NCVEC text.
← T4B01 All of T4B T4B03 →

The rest of T4B

  1. T4B01 What is the effect of excessive microphone gain on SSB transmissions?
  2. T4B02 Which of the following can be used to enter a transceiver's operating frequency?
  3. T4B03 How is squelch adjusted so that a weak FM signal can be heard?
  4. T4B04 What does an FM signal sound like when received slightly off frequency?
  5. T4B05 What does the scanning function of an FM transceiver do?
  6. T4B06 Which of the following controls could be used if the voice pitch of a single-sideband signal returning to you…
  7. T4B07 What is a DMR "code plug"?
  8. T4B08 What is the advantage of having a choice of receiver filter bandwidths in a multimode transceiver?
  9. T4B09 How is a specific group of stations selected on a DMR digital voice transceiver?
  10. T4B10 Which of the following receiver filter bandwidths provides the best signal-to-noise ratio for SSB reception?
  11. T4B11 Which of the following must be programmed into a D-STAR digital transceiver before transmitting?
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