FCC Commercial Element 9 pool, section 1

Subelement A

VHF-DSC Equipment & Operation:

Section 1

Frequency and Bandwidth:

1A1

What are the correct VHF Channels and Frequencies for Calling/Distress, DSC and bridge-to-bridge operations?

Correct Answer
A.
Ch-16, 156.800 MHz, Ch-70, 156.525 MHz and Ch-13, 156.650 MHz.
B.
Ch-06, 156.300 MHz, Ch-16, 156.800 MHz and Ch-13, 156.650 MHz.
C.
Ch-08, 156.400 MHz, Ch-70, 156.525 MHz and Ch-16, 156.800 MHz.
D.
Ch-06, 156.300 MHz, Ch-12, 156.600 MHz and Ch-13, 156.650 MHz.

1A1

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1A2

What is the frequency separation between Transmit and Receive frequencies on a duplex channel?

A.
2.8 MHz
Correct Answer
B.
4.6 MHz
C.
6.4 MHz
D.
10.7 MHz

1A2

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1A3

What is the assigned channel spacing for VHF channels?

A.
10 kHz
B.
15 kHz
Correct Answer
C.
25 kHz
D.
50 kHz

1A3

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1A4

What is the allowed frequency tolerance for the DSC carrier frequencies?

A.
10 Hz
B.
20 Hz
C.
5 ppm
Correct Answer
D.
10 ppm

1A4

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1A5

Using a frequency counter with an accuracy of 2 ppm — which of the following are within legal tolerance for the frequencies of 156.800 MHz and 156.525 MHz?

Correct Answer
A.
156,798.758 kHz and 156.526.243 kHz.
B.
156,798.735 kHz and 156,526.258 kHz.
C.
156,801.567 kHz and 156,526.476 kHz.
D.
156,798.635 kHz and 156,523.352 kHz

1A5

There is a typo in answer A with two periods occuring in the second frequency when one should be a comma.

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1A6

Using a frequency counter with an accuracy of 5 ppm — which of the following are within legal tolerance for the frequencies of 156.875 MHz and 157.200?

A.
156,873.562 kHz and 157,198.264 kHz.
Correct Answer
B.
156,875.774 kHz and 157.199.321 kHz.
C.
156,876.562 kHz and 157,201.355 kHz.
D.
156,873.336 kHz and 157,201.570 kHz.

1A6

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