MF-HF Equip. and Comms:
MF-HF FEC Operation-1:
Which of the following statements concerning SITOR (NBDP) communications is true?
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Communication is established on the working channel and answerbacks are exchanged before FEC broadcasts can be received.
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All of these answers are true.
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Weather broadcasts cannot be made in FEC because sending each character twice would cause the broadcast to be prohibitively long.
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Correct AnswerTwo-way communication with the coast radio station using FEC is not necessary to be able to receive the broadcasts.
Tags: none
Which of the following is true of SITOR (NBDP) Mode B (FEC), in the presence of static crashes.
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Correct AnswerFEC reduces the error rate by transmitting each character twice.
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Data flow rate depends on signal propagation.
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Idle characters are sent upon request.
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Transmitter and receiver cannot synchronize.
Tags: none
Which of the following statements concerning SITOR (NBDP) communications is true?
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FEC requests are first acknowledged by the vessel's transmitter before broadcasts can be received.
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Correct AnswerFEC mode broadcasts can be passively received without the transmitter being active.
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Weather broadcasts are always made in ARQ mode to ensure reception.
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ARQ mode communications can be passively received without the transmitter being active.
Tags: none
The sequence ARQ, FEC, SFEC best corresponds to which of the following sequences?
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One-way communications to a single station, one-way communications to all stations, two-way communications.
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One-way communications to all stations, two-way communications, one-way communications to a single station.
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Correct AnswerTwo way communications, one-way communications to all stations, one-way communications to a single station.
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Two way communications, One way communications to a single station, One way communications to all stations.
Tags: none
The sequence BFEC, SFEC, ARQ best corresponds to which of the following sequences?
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One-way communications to a single station, one-way communications to all stations, two-way communications.
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One-way communications to all stations, two way communications, one-way communications to a single station.
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Correct AnswerOne-way communications to all stations, one-way communications to a single station, two way communications.
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Two way communications, one-way communications to all stations, two-way communications.
Tags: none
Selective FEC communications (SFEC) are employed when:
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Multiple stations without a group SELCAL must receive communications without using their transmitters (Radio Silence).
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Multiple stations must receive communications by using their transmitters to achieve phasing.
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An individual station must receive communications by using their transmitter to achieve phasing and block other stations from breaking in.
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Correct AnswerAn individual station must receive communications without using any transmitters (Radio Silence).
Tags: none
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