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Subel. J
6 questions
Subelement J

MF-HF Equip. and Comms:

Section 94

MF-HF FEC Operation-1

Which of the following statements concerning SITOR (NBDP) communications is true?

  • Communication is established on the working channel and answerbacks are exchanged before FEC broadcasts can be received.
  • All of these answers are true.
  • Weather broadcasts cannot be made in FEC because sending each character twice would cause the broadcast to be prohibitively long.
  • Correct Answer
    Two-way communication with the coast radio station using FEC is not necessary to be able to receive the broadcasts.
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Which of the following is true of SITOR (NBDP) in FEC mode, in the presence of static crashes.

  • Correct Answer
    FEC reduces the error rate by transmitting each character twice.
  • Data flow rate depends on signal propagation.
  • Idle characters are sent upon request.
  • Transmitter and receiver do not synchronize.
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Which of the following statements concerning SITOR (NBDP) communications is true?

  • FEC requests are first acknowledged by the vessel's transmitter before broadcasts can be received.
  • Correct Answer
    FEC mode broadcasts can be passively received without the transmitter being active.
  • Weather broadcasts are always made in ARQ mode to ensure reception.
  • ARQ mode communications can be passively received without the transmitter being active.
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The sequence ARQ, FEC, SFEC best corresponds to which of the following sequences?

  • One-way communications to a single station, one-way communications to all stations, two-way communications.
  • One-way communications to all stations, two-way communications, one-way communications to a single station.
  • Correct Answer
    Two-way communications, one-way communications to all stations, one-way communications to a single station.
  • Two-way communications, One-way communications to a single station, One-way communications to all stations.
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The sequence BFEC, SFEC, ARQ best corresponds to which of the following sequences?

  • One-way communications to a single station, one-way communications to all stations, two-way communications.
  • One-way communications to all stations, two-way communications, one-way communications to a single station.
  • Correct Answer
    One-way communications to all stations, one-way communications to a single station, two-way communications.
  • Two-way communications, one-way communications to all stations, two-way communications.
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Selective FEC communications (SFEC) are employed when:

  • Multiple stations without a group SELCAL must receive communications without using their transmitters (Radio Silence).
  • Multiple stations must receive communications by using their transmitters to achieve phasing.
  • An individual station must receive communications by using their transmitter to achieve phasing and block other stations from breaking in.
  • Correct Answer
    An individual station must receive communications without using any transmitters (Radio Silence).
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