7-A-094: MF-HF: FEC Operation #1
7-94J1:
Which of the following statements concerning SITOR (NBDP) communications is true?
Two-way communication with the coast radio station using FEC is not necessary to be able to receive the broadcasts.
Communication is established on the working channel and answerbacks are exchanged before FEC broadcasts can be received.
All of these answers are true.
Weather broadcasts cannot be made in FEC because sending each character twice would cause the broadcast to be prohibitively long.
7-94J2:
Which of the following is true of SITOR (NBDP) Mode B (FEC), in the presence of static crashes.
FEC reduces the error rate by transmitting each character twice.
Data flow rate depends on signal propagation.
Idle characters are sent upon request.
Transmitter and receiver cannot synchronize.
7-94J3:
Which of the following statements concerning SITOR (NBDP) communications is true?
FEC mode broadcasts can be passively received without the transmitter being active.
FEC requests are first acknowledged by the vessel's transmitter before broadcasts can be received.
Weather broadcasts are always made in ARQ mode to ensure reception.
ARQ mode communications can be passively received without the transmitter being active.
7-94J4:
The sequence ARQ, FEC, SFEC best corresponds to which of the following sequences?
Two way communications, one-way communications to all stations, one-way communications to a single station.
One-way communications to a single station, one-way communications to all stations, two-way communications.
One-way communications to all stations, two-way communications, one-way communications to a single station.
Two way communications, One way communications to a single station, One way communications to all stations.
7-94J5:
The sequence BFEC, SFEC, ARQ best corresponds to which of the following sequences?
One way communications to all stations, one-way communications to a single station, two-way communications.
One-way communications to a single station, one-way communications to all stations, two-way communications.
One-way communications to all stations, two way communications, one-way communications to a single station.
Two way communications, one-way communications to all stations, two-way communications.
7-94J6:
Selective FEC communications (SFEC) are employed when:
An individual station must receive communications without using any transmitters (Radio Silence).
Multiple stations without a group SELCAL must receive communications without using their transmitters (Radio Silence).
Multiple stations must receive communications by using their transmitters to achieve phasing.
An individual station must receive communications by using their transmitter to achieve phasing and block other stations from breaking in.
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Color key:
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● = Unseen
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● = Weak
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● = Review
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● = Learned
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● = Incorrect answer
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