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Subel. T4
11 questions
Subelement T4

AMATEUR RADIO PRACTICES

Section T4B

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

What is the effect of excessive microphone gain on SSB transmissions?

  • Frequency instability
  • Correct Answer
    Distorted transmitted audio
  • Increased SWR
  • Sideband inversion
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Which of the following can be used to enter a transceiver’s operating frequency?

  • Correct Answer
    The keypad or VFO knob
  • The CTCSS or DTMF encoder
  • The Automatic Frequency Control
  • All these choices are correct
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How is squelch adjusted so that a weak FM signal can be heard?

  • Correct Answer
    Set the squelch threshold so that receiver output audio is on all the time
  • Turn up the audio level until it overcomes the squelch threshold
  • Turn on the anti-squelch function
  • Enable squelch enhancement
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What does an FM signal sound like when received slightly off frequency?

  • The audio increases in pitch
  • The audio decrease in pitch
  • There is no effect except for reduction in amplitude
  • Correct Answer
    The audio becomes distorted
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What does the scanning function of an FM transceiver do?

  • Checks incoming signal deviation
  • Prevents interference to nearby repeaters
  • Correct Answer
    Tunes through a range of frequencies to check for activity
  • Tunes through a range of frequencies to determine the antenna’s resonant frequency
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Which of the following controls could be used if the voice pitch of a single-sideband signal returning to your CQ call seems too high or low?

  • The AGC or limiter
  • The bandwidth selection
  • The tone squelch
  • Correct Answer
    The RIT or Clarifier
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What is a DMR “code plug”?

  • An adapter cable used to connect a DMR radio to a computer for internet access
  • Correct Answer
    Configuration data loaded onto your radio to access repeaters and talkgroups
  • An upgrade to DMR programming software provided by the radio manufacturer to accommodate new radio models
  • A Coder-Decoder (CODEC) that converts analog voice data to DMR digital data and vice versa
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What is the advantage of having a choice of receiver filter bandwidths in a multimode transceiver?

  • Permits monitoring several modes simultaneously by selecting a separate filter for each mode
  • Correct Answer
    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
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How is a specific group of stations selected on a DMR digital voice transceiver?

  • By retrieving the frequencies from transceiver memory
  • By enabling the group’s CTCSS tone
  • Correct Answer
    By entering the group’s identification code
  • By inserting a five-pin, pre-programmed code plug
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Which of the following receiver filter bandwidths provides the best signal-to-noise ratio for SSB reception?

  • 500 Hz
  • 1000 Hz
  • Correct Answer
    2400 Hz
  • 5000 Hz
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Which of the following must be programmed into a D-STAR digital transceiver before transmitting?

  • Correct Answer
    Your call sign
  • Your output power
  • The codec type being used
  • All these choices are correct
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