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Subel. B
6 questions
Subelement B

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

Section 19

DSC Operations:

What precedes the phasing signal in a DSC distress alert call?

  • An alternating dot pattern of 20 bits
  • An alternating dot pattern of 100 bits
  • Correct Answer
    An alternating dot pattern of 200 bits
  • An alternating dot pattern of 400 bits
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What type of code is used for DSC transmissions?

  • A 7 bit code with a constant ratio of 4/3 between the 1s and 0s.
  • A 7 bit code followed by an error check character at the end.
  • A 10 bit code followed by an error check character at the end.
  • Correct Answer
    A 10 bit code with 7 bits used for information and 3 bits used for error correction.
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What is the correct frequency shift and sub-carrier for MF-HF-DSC?

  • Correct Answer
    +/- 85 Hz and 1700 Hz
  • +/- 170 Hz and 1700 Hz
  • +/- 250 Hz and 1500 Hz
  • +/- 400 Hz and 1900 Hz
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What is the time diversity reception interval for a MF-HF-DSC call?

  • 33-1/3 milliseconds
  • Correct Answer
    400 milliseconds
  • 450 milliseconds
  • 250 milliseconds
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A MF/HF Distress priority DSC call may be formatted to include the following:

  • MMSI, vessel position, nature of distress, follow-on communications by J3E only.
  • Correct Answer
    MMSI, vessel position, nature of distress, follow-on communications by J3E or F1B.
  • Call sign, vessel position, nature of distress, follow-on communications by J3E or F1B.
  • Name of vessel, vessel position, nature of distress, follow-on communications by J3E or F1B.
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What statement is false concerning DSC calls addressed to MMSI 003669999?

  • MMSI 003669999 is an established group call that includes all U.S. Coast Guard Stations.
  • DSC calls to MMSI 003669999 will be received by all DSC-equipped USCG coast stations within radio range.
  • Correct Answer
    DSC calls to MMSI 003669999 may not be used to test MF/HF DSC equipment aboard ships.
  • DSC calls to MMSI 003669999 may result in an automated acknowledgement from USCG coast stations.
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