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Subel. B
6 questions
Subelement B

MF-HF-DSC-SITOR (NBDP) Equip. & Ops:

Section 14

Receiver Faults-1:

The voice is garbled and unreadable on MF/HF SSB channels. What is the most likely cause?

  • The R.I.T circuit has failed.
  • The first RF stage has failed.
  • The frequency synthesizer has failed.
  • Correct Answer
    The beat frequency oscillator circuit has failed.
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All signals sound normal on an MF/HF receiver except one that has a very high pitched voice barely readable. What is the most likely cause?

  • Correct Answer
    The transmitter of the abnormal signal is off frequency.
  • The receiver frequency synthesizer circuit is defective.
  • The voltage controlled oscillator has failed.
  • The B.F.O. circuit is faulty.
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You are able to hear signals in the voice/SSB mode but not in the SITOR (NBDP) mode. What is the most likely cause?

  • The phase locked loop circuit has failed.
  • Correct Answer
    The 500 Hz I.F. filter has become defective.
  • The R.F. amplifier has failed.
  • The B.F.O. circuit has failed.
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The phase locked loop circuit in an MF/HF receiver appears to be faulty. What is the most likely cause?

  • The AGC circuit has become defective.
  • The Beat Frequency Oscillator is inoperative.
  • Correct Answer
    The Voltage Controlled Oscillator is inoperative.
  • The 500 Hz I.F. filter has become defective.
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You are able to hear signals in the SITOR (NBDP) mode but not in the voice/SSB mode. What is the most likely cause?

  • The B.F.O. circuit has failed.
  • The audio amplifier is defective.
  • Correct Answer
    The 2.8 kHz filter has become defective.
  • The R.F. amplifier has failed.
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The AGC function of an MF/HF receiver is inoperative. What is the most likely cause?

  • The B.F.O. circuit has failed.
  • The Voltage controlled Oscillator is inoperative.
  • The audio amplifier is defective.
  • Correct Answer
    Failure of a variable gain amplifier in the RF stage.
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