Key Topic 85: VHF

Question 1

3-85N1: What is the channel spacing used for VHF marine radio?

A. 10 kHz.
B. 12.5 kHz.
C. 20 kHz.
D. 25 kHz.

Answer 1

D. 25 kHz.

Question 2

3-85N2: What VHF channel is assigned for distress and calling?

A. 70
B. 16
C. 21A
D. 68

Answer 2

B. 16

Question 3

3-85N3: What VHF Channel is used for Digital Selective Calling and acknowledgement?

A. 16
B. 21A
C. 70
D. 68

Answer 3

C. 70

Question 4

3-85N4: Maximum allowable frequency deviation for VHF marine radios is:

A. +/- 5 kHz.
B. +/- 15 kHz.
C. +/- 2.5 kHz.
D. +/- 25 kHz.

Answer 4

A. +/- 5 kHz.

Question 5

3-85N5: What is the reason for the USA-INT control or function?

A. It changes channels that are normally simplex channels into duplex channels.
B. It changes some channels that are normally duplex channels into simplex channels.
C. When the control is set to “INT” the rang is increased.
D. None of the above.

Answer 5

B. It changes some channels that are normally duplex channels into simplex channels.

Question 6

3-85N6: How might an installer verify correct GPS sentence to marine DSC VHF radio?

A. Look for latitude and longitude, plus speed, on VHF display.
B. Press and hold the red distress button.
C. Look for GPS confirmation readout.
D. Ask for VHF radio check position report.

Answer 6

A. Look for latitude and longitude, plus speed, on VHF display.