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Subel. J
6 questions
Subelement J

MF-HF Equip. and Comms:

Section 98

MF-HF DSC Controller Alert/Call Response

The Distress Alarm sounds and the screen readout no longer contains the particulars of the Distress:

  • The particulars are rarely routed to the printer so it is of no use to examine the printer.
  • Examine the Transmitted Data Directory or the printer to recover the information.
  • Call the Distress vessel on the DSC frequency and request a retransmission.
  • Correct Answer
    Examine the Received Data Directory or the printer to recover the information.
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A DSC Distress alert is received by your vessel and your transceiver frequency display reads: Transmit = 4207.5 kHz and Receive = 4207.5 kHz with J3E emission -- what information can you infer from this?

  • Correct Answer
    The DSC call requested voice on 4207.5 kHz simplex but the requested alternate frequency is improper.
  • The DSC controller decoded the requested voice frequency as 4207.5 kHz simplex and your DSC controller has automatically set-up your transceiver and therefore the requested alternate frequency is correct.
  • The DSC call came in on 4 MHz DSC. You should set-up your transmitter and respond on the appropriate voice follow-on frequency of 4177.5 kHz.
  • The DSC call came in on 4 MHz DSC. You should set-up your transmitter and respond on the appropriate voice follow-on frequency of 4207.5 kHz.
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What are potential dangers of automatic transceiver switching in response to a DSC call?

  • Incorrectly formatted DSC calls from other vessels result in a warning in the DSC alarm screen but the vessel still might be switched to an illegal or improper outcome.
  • Correct Answer
    The transceiver may be switched out of the marine bands or the frequency may not match the requested priority or emission.
  • The automatic transceiver switching software always detects improper priorities, emissions & frequencies to ensure there is no danger.
  • The automatic transceiver switching feature always interrupting safe navigation of your own vessel and placing the unit on the GMDSS Distress, Urgency or Safety follow-on frequencies.
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Which of these would not be a bad outcome of an Urgency DSC call to all vessels specifying an alternate TELEX frequency & emission that cause your transceiver to automatically switch?

  • The DSC controller decoded the contents of the DSC call and the requested frequency is not on the DUS table/placard but is in the marine band frequencies in the J2B emission.
  • The DSC controller decoded the contents of the DSC call and the requested frequency is on the DUS table/placard in the J3E emission.
  • Correct Answer
    The DSC controller decoded the contents of the DSC call and the requested frequency is on the DUS table/placard in the J2B emission.
  • The DSC controller decoded the contents of the DSC call and the requested frequency is not on the DUS table/placard, is not in the marine band or the other vessel requested a J3E emission.
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An incoming Distress priority 16 MHz DSC call requesting J3E emission might automatically switch to what frequency?

  • 16420.0 MHz
  • 16696.5 kHz
  • Correct Answer
    16420.0 kHz
  • 16804.5 kHz
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An incoming DSC Distress alert on 8414.5 kHz will have what result?

  • The DSC controller will emit both an audible and visual alarm.
  • The particulars of the alert may be printed out.
  • The Distress information contained in the alert will be sent to the data directory.
  • Correct Answer
    All of these answers would typically occur.
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