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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
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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.
  • 156,875.774 kHz and 157.199.321 kHz.
  • 156,876.562 kHz and 157,201.355 kHz.
  • 156,873.336 kHz and 157,201.570 kHz.
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