Key Topic 88: FAX, NAVTEX

Question 1

3-88N1: What is facsimile?

A. The transmission of still pictures by slow-scan television.
B. The transmission of characters by radioteletype that form a picture when printed.
C. The transmission of printed pictures for permanent display on paper.
D. The transmission of video by television.

Answer 1

C. The transmission of printed pictures for permanent display on paper.

Question 2

3-88N2: What is the standarad scan rate for high-frequency 3 MHz - 23 MHz weather facsimile reception from shore stations?

A. 240 lines per minute.
B. 120 lines per minute.
C. 150 lines per minute.
D. 60 lines per minute.

Answer 2

B. 120 lines per minute.

Question 3

3-88N3: What would be the bandwidth of a good crystal lattice band-pass filter for weather facsimile HF (high frequency) reception?

A. 500 Hz at -6 dB.
B. 6 kHz at -6 dB.
C. 1 kHz at -6 dB.
D. 15 kHz at -6 dB.

Answer 3

C. 1 kHz at -6 dB.

Question 4

3-88N4: Which of the following statements about NAVTEX is true?

A. Receives MSI broadcasts using SITOR-B or FEC mode.
B. The ship station transmits on 518 kHz.
C. The ship receives MSI broadcasts using SITOR-A or ARQ mode.
D. NAVTEX is received on 2182 kHz using SSB.

Answer 4

A. Receives MSI broadcasts using SITOR-B or FEC mode.

Question 5

3-88N5: Which of the following is the primary frequency that is used exclusively for NAVTEX broadcasts internationally?

A. 2187.5 kHz.
B. 4209.5 kHz.
C. VHF channel 16.
D. 518 kHz.

Answer 5

D. 518 kHz.

Question 6

3-88N6: What determines whether a NAVTEX receiver does not print a particular type of message content?

A. The message does not concert your vessel.
B. The subject indicator matches that programmed for rejection by the operator.
C. The transmitting station ID covering your area has not been programmed for rejection by the operator.
D. All messages sent during each broadcast are printed.

Answer 6

B. The subject indicator matches that programmed for rejection by the operator.