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Subelement A
VHF-DSC Equipment & Operation:
Section 1
Frequency and Bandwidth:
What are the correct VHF Channels and Frequencies for Calling/Distress, DSC and bridge-to-bridge operations?
Ch-16, 156.800 MHz, Ch-70, 156.525 MHz and Ch-13, 156.650 MHz.
• Ch-06, 156.300 MHz, Ch-16, 156.800 MHz and Ch-13, 156.650 MHz.
• Ch-08, 156.400 MHz, Ch-70, 156.525 MHz and Ch-16, 156.800 MHz.
• Ch-06, 156.300 MHz, Ch-12, 156.600 MHz and Ch-13, 156.650 MHz.
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What is the frequency separation between Transmit and Receive frequencies on a duplex channel?
• 2.8 MHz
4.6 MHz
• 6.4 MHz
• 10.7 MHz
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What is the assigned channel spacing for VHF channels?
• 10 kHz
• 15 kHz
25 kHz
• 50 kHz
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What is the allowed frequency tolerance for the DSC carrier frequencies?
• 10 Hz
• 20 Hz
• 5 ppm
10 ppm
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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?
156,798.758 kHz and 156.526.243 kHz.
• 156,798.735 kHz and 156,526.258 kHz.
• 156,801.567 kHz and 156,526.476 kHz.
• 156,798.635 kHz and 156,523.352 kHz

Silly Study Tip:

The correct answer has typo with two decimals in the second frequency.

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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?
• 156,873.562 kHz and 157,198.264 kHz.