Key Topic 86: MF-HF, SSB-SITOR

Question 1

3-86N1: What is a common occurrence when voice-testing an SSB aboard a boat?

A. Ammeter fluctuates down with each spoken word.
B. Voltage panel indicator lamps may glow with each syllable.
C. Automatic tuner cycles on each syllable.
D. Minimal voltage drop seen at power source.

Answer 1

B. Voltage panel indicator lamps may glow with each syllable.

Question 2

3-86N2: What might contribute to apparent low voltage on marine SSB transmitting?

A. Blown red fuse.
B. Too much grounding.
C. Blown black negative fuse.
D. Antenna mismatch.

Answer 2

C. Blown black negative fuse.

Question 3

3-86N3: What type of wire connects an SSB automatic tuner to an insulated backstay?

A. RG8U.
B. RG213.
C. 16-gauge two-conductor.
D. GTO-15 high-voltage cable.

Answer 3

D. GTO-15 high-voltage cable.

Question 4

3-86N4: Which of the following statements concerning SITOR communications is true?

A. ARQ message transmissions are made in data groups consisting of three-character blocks.
B. ARQ transmissions are acknowledged by the Information Receiving Station only at the end of the message.
C. ARQ communications rely upon error correction by time diversity transmission and reception.
D. forward error correction is an interactive mode.

Answer 4

A. ARQ message transmissions are made in data groups consisting of three-character blocks.

Question 5

3-86N5: 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.

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.

Answer 5

C. Two-way communications, one-way communications to all stations, one-way communications to a single station.

Question 6

3-86N6: Which of the following statements concerting SITOR communications is true?

A. Communication is established on the working channel and answerbacks are exchanged before FEC broadcasts can be received.

B. In the ARQ mode each character is transmitted twice.

C. Weather broadcasts connot be made in FEC because sending each character twice would cause the broadcast to be prohibitively long.

D. Two-way communication with the coast radio station using FEC is not necessary to be able to receive the broadcasts.

Answer 6

D. Two-way communication with the coast radio station using FEC is not necessary to be able to receive the broadcasts.