FCC Commercial Element 9 pool, section 6

Subelement A

VHF-DSC Equipment & Operation:

Section 6

Transmitter Technology:

6A1

What is the maximum allowable deviation of a marine VHF transmitter?

6A1

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6A2

What is the modulation index?

Correct Answer
A.
The maximum carrier deviation divided by the maximum modulation frequency.
B.
The maximum modulation frequency divided by the maximum carrier frequency.
C.
The maximum carrier deviation multiplied by the maximum carrier frequency.
D.
The maximum carrier deviation divided by the amount of pre-emphasis.

6A2

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6A3

How is pre-emphasis used in an FM transceiver?

A.
The lower modulation frequencies are boosted before transmitting by 3 db per octave and reduced by the same amount at the receiver.
Correct Answer
B.
The higher modulation frequencies are boosted before transmitting by 6 db per octave and reduced by the same amount at the receiver.
C.
The lower modulation frequencies are boosted before transmitting by 6 db per octave and reduced by the same amount at the receiver.
D.
The higher modulation frequencies are boosted before transmitting by 3 db per octave and reduced by the same amount at the receiver.

6A3

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6A4

A modulation index set to less than 1 to 1 may result in what?

6A4

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6A5

What is the most common type of emission for shipboard VHF-DSC transceivers?

6A5

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6A6

How many sidebands does a VHF FM transmitter have?

6A6

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