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Subelement A
VHF-DSC Equipment & Operation:
Section 6
Transmitter Technology:
What is the maximum allowable deviation of a marine VHF transmitter?
  • 12 kHz
  • 10 kHz
  • 7.5 kHz
  • Correct Answer
    5 kHz
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What is the modulation index?
  • Correct Answer
    The maximum carrier deviation divided by the maximum modulation frequency.
  • The maximum modulation frequency divided by the maximum carrier frequency.
  • The maximum carrier deviation multiplied by the maximum carrier frequency.
  • The maximum carrier deviation divided by the amount of pre-emphasis.
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How is pre-emphasis used in an FM transceiver?
  • The lower modulation frequencies are boosted before transmitting by 3 db per octave and reduced by the same amount at the receiver.
  • Correct Answer
    The higher modulation frequencies are boosted before transmitting by 6 db per octave and reduced by the same amount at the receiver.
  • The lower modulation frequencies are boosted before transmitting by 6 db per octave and reduced by the same amount at the receiver.
  • The higher modulation frequencies are boosted before transmitting by 3 db per octave and reduced by the same amount at the receiver.
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A modulation index set to less than 1 to 1 may result in what?
  • Excessive deviation
  • Unstable signal excursions
  • Correct Answer
    Unusually low level transmit audio
  • Unusually high pitch audio response
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What is the most common type of emission for shipboard VHF-DSC transceivers?
  • F1B
  • J3B
  • Correct Answer
    G3E
  • H3E
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How many sidebands does a VHF FM transmitter have?
  • One
  • Two
  • One to four
  • Correct Answer
    Many
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