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Subelement A
VHF-DSC Equipment & Operation:
Section 9
Digital Selective Calling:
What is the correct frequency shift and sub-carrier for VHF-DSC?
  • Correct Answer
    1300-2100 Hz, sub-carrier 1700 Hz.
  • 1500-2300 Hz, sub-carrier 1900 Hz.
  • 1200-2600 Hz, sub-carrier 1900 Hz.
  • 1500-2300 Hz, sub-carrier 1700 Hz.
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What is the correct modulation rate and index of modulation for VHF-DSC?
  • 800 baud, 3.0 +/- 10%
  • Correct Answer
    1200 baud, 2.0 +/- 10%
  • 1500 baud, 2.0 +/- 5%
  • 1800 baud, 3.0 +/- 5%
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How might a DSC radio check be accomplished with a coast station?
  • Enter the station's MMSI, and press the button under the red plastic cover for 5 seconds.
  • Select DSC menu item TEST, enter the Coast Station's FCC call letters, and send the test call.
  • Correct Answer
    Select DSC menu item TEST, enter the Coast Station's MMSI number, and send the test.
  • Select DSC menu ALL SHIPS, and send the test message.
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You attempt to program a new MMSI into a VHF radio with an existing MMSI. The radio will not accept the entry. What is the best course of action to correct this problem?
  • You must RESET the DSC memory by holding down two buttons as described in the user manual.
  • You can never change a number, once one is already programmed.
  • Re-register the old MMSI with the new owner and make no programming changes to the radio.
  • Correct Answer
    Contact the manufacturer for action to clear the MMSI memory and accept the new number.
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What is the time diversity reception interval for a VHF-DSC call?
  • Correct Answer
    33-1/3 milliseconds
  • 40.5 milliseconds
  • 66-2/3 milliseconds
  • 91 milliseconds
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What might a voltmeter indicate when testing a DSC circuit for an outgoing message data stream?
  • Steady reading of 12 volts DC.
  • Correct Answer
    Fluctuating reading from 0 to 2 volts DC.
  • There will be an absence of voltage.
  • Voltage swing from -12 VDC to + 12 VDC.
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