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Subel. B
6 questions
Subelement B

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

Section 21

SITOR (NBDP)-FEC:

If a vessel is within range of NAVTEX broadcasts and both the Inmarsat-C and the NAVTEX receiver are inoperative the GMDSS operator should:

  • Correct Answer
    Select 518 kHz FEC TELEX on the MF/HF console to receive MSI.
  • Select 518 kHz ARQ TELEX on the MF/HF console to receive MSI.
  • Request repairs of the Sat-C system and wait until within range of NAVTEX.
  • Select an HF MSI frequency and ARQ TELEX mode to receive MSI.
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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.
  • Correct Answer
    Two way communications, one-way communications to all stations, one-way communications to a single station.
  • One-way communications to all stations, two-way communications, 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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Selective FEC communications (SFEC) are employed when:

  • Multiple stations without a group SELCALL must receive communications without using their transmitters.
  • Multiple stations must receive communications by using their transmitters to achieve phasing.
  • Correct Answer
    An individual station must receive communications without transmitting (Radio Silence).
  • An individual station must receive communications by using their transmitter to achieve phasing and block other stations from breaking in.
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Which of the following is true of SITOR (NBDP) Mode B (FEC), in the presence of static crashes.

  • Data flow rate depends on signal propagation.
  • Idle characters are sent upon request.
  • Transmitter and receiver cannot synchronize.
  • Correct Answer
    FEC reduces the error rate by transmitting each character twice.
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If the vessel is beyond range of NAVTEX broadcasts and the Sat-C system fails, the GMDSS operator must:

  • Correct Answer
    Select an HF MSI frequency and FEC TELEX mode to receive MSI.
  • Select 518 kHz ARQ TELEX on the MF/HF console to receive MSI.
  • Request repairs of the Sat-C system and wait until within range of NAVTEX.
  • Select 518 kHz FEC TELEX on the MF/HF console to receive MSI.
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If the vessel is experiencing atmospheric interference with NAVTEX broadcasts, especially in the tropics, the GMDSS operator should:

  • Select one of the 6 HF MSI frequencies and set-up the transceiver in ARQ TELEX mode.
  • Correct Answer
    Select one of the 8 HF MSI frequencies and set-up the transceiver in FEC TELEX mode.
  • Select one of the 6 MF MSI frequencies and set-up the transceiver in FEC TELEX mode.
  • Select the MF MSI frequency dedicated to tropical MSI and set-up the transceiver in FEC TELEX mode.
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