DSC is used primarily to_________.
A. transmit and receive distress and safety alerts to and from other ships and shore stations via radio
B. receive weather warnings, navigational notices and other marine safety information
C. Provide routine communications with the shipowner
D. report ships position to search and-rescue authorities via satellite
查看答案
Acknowledgement of receipt of a DSC alert would be performed by___________.
A. DSC equipment, on the frequency concerned
B. VHF RT equipment, on the frequency concerned
C. SSB equipment, on the frequency concerned
D. all of the above are likely
Which of the following is not a NBDP frequency?
A. 2,174.5 kHz.
B. 4,177.5 kHz.
C. 6,312 kHz.
D. 8,376.5 kHz.
Which statement is correct?
A. FEC requests are first acknowledged by the vessel, s transmitter before broadcasts can be received.
B. FEC mode broadcasts can be received without the transmitter being turned on.
C. Weather broadcasts are always made in ARQ mode.
D. None of the above.
What is the signal transmitted in H3E mode?
A. Two sidebands, upper and lower.
B. A reduced carrier and the lower sideband.
C. A full carrier and the upper sideband.
D. A full carrier and both upper and lower sidebands.
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