FCC Commercial Element 7 pool, section 94

Subelement J

MF-HF Equip. and Comms:

Section 94

MF-HF FEC Operation-1

94J1

Which of the following statements concerning SITOR (NBDP) communications is true?

A.
Communication is established on the working channel and answerbacks are exchanged before FEC broadcasts can be received.
B.
All of these answers are true.
C.
Weather broadcasts cannot be made in FEC because sending each character twice would cause the broadcast to be prohibitively long.
Correct Answer
D.
Two-way communication with the coast radio station using FEC is not necessary to be able to receive the broadcasts.

94J1

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94J2

Which of the following is true of SITOR (NBDP) in FEC mode, in the presence of static crashes.

Correct Answer
A.
FEC reduces the error rate by transmitting each character twice.
B.
Data flow rate depends on signal propagation.
C.
Idle characters are sent upon request.
D.
Transmitter and receiver do not synchronize.

94J2

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94J3

Which of the following statements concerning SITOR (NBDP) communications is true?

A.
FEC requests are first acknowledged by the vessel's transmitter before broadcasts can be received.
Correct Answer
B.
FEC mode broadcasts can be passively received without the transmitter being active.
C.
Weather broadcasts are always made in ARQ mode to ensure reception.
D.
ARQ mode communications can be passively received without the transmitter being active.

94J3

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94J4

The sequence ARQ, FEC, SFEC best corresponds to which of the following sequences?

A.
One-way communications to a single station, one-way communications to all stations, two-way communications.
B.
One-way communications to all stations, two-way communications, one-way communications to a single station.
Correct Answer
C.
Two-way communications, one-way communications to all stations, one-way communications to a single station.
D.
Two-way communications, One-way communications to a single station, One-way communications to all stations.

94J4

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94J5

The sequence BFEC, SFEC, ARQ best corresponds to which of the following sequences?

A.
One-way communications to a single station, one-way communications to all stations, two-way communications.
B.
One-way communications to all stations, two-way communications, one-way communications to a single station.
Correct Answer
C.
One-way communications to all stations, one-way communications to a single station, two-way communications.
D.
Two-way communications, one-way communications to all stations, two-way communications.

94J5

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94J6

Selective FEC communications (SFEC) are employed when:

A.
Multiple stations without a group SELCAL must receive communications without using their transmitters (Radio Silence).
B.
Multiple stations must receive communications by using their transmitters to achieve phasing.
C.
An individual station must receive communications by using their transmitter to achieve phasing and block other stations from breaking in.
Correct Answer
D.
An individual station must receive communications without using any transmitters (Radio Silence).

94J6

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