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Subel. G
6 questions
Subelement G

VHF-DSC Equipment & Comms:

Section 46

VHF: Simples-Duplex, USA-INT:

The nearest Coast Guard station is being called by a vessel on Ch-22. That vessel's USA-INT switch is set to INT. What will be the results?

  • There should be no problem carrying on communications.
  • The Coast Guard station will not hear the call due to listening on a duplex receiving frequency.
  • Neither station will hear the other's calls.
  • Correct Answer
    The Coast Guard station will probably hear the call and respond but the vessel called will not hear the response.
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What is the reason for the USA-INT control or function?

  • Correct Answer
    It changes some channels that are normally duplex INT channels into simplex USA channels.
  • It changes some channels that are normally simplex INT channels into duplex USA channels.
  • When the control is set to "INT" the range is increased.
  • It changes duplex USA channels to simplex for International use.
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Which of the following statements is true?

  • You should always use the "INT" setting for calling a Public Correspondence station.
  • Correct Answer
    Using the "USA" setting changes certain channels from duplex to simplex operation.
  • You should use Ch-22 when calling the U. S. Coast Guard.
  • Using the "INT" setting will prevent proper Ch-13 Bridge-to-Bridge operations.
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The USA-INT control on VHF units:

  • Selects duplex operations for U.S. coastal waters and simplex operations in non-U.S. waters, on the "alpha" channels.
  • Ensures that the "alpha" channels are correctly set to duplex for use in U.S. waters & on VTS channels.
  • Correct Answer
    Changes selected international duplex channels to simplex channels for use in U.S. waters, on the "alpha" channels.
  • Changes selected international simplex channels to duplex channels for use in U.S. waters, on the "alpha" channels.
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The USA-INT control on VHF units:

  • Was made necessary by a desire for more duplex channels in the U.S.
  • Correctly set, will result in duplex operations in U.S. Coastal waters on the "alpha" channels.
  • Correct Answer
    Correctly set, will result in simplex operations in U.S. Coastal waters on the "alpha" channels.
  • Was made necessary by a desire to convert simplex international channels to duplex channels in the U.S.
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What would happen if your VHF is set to "INT" and you called a VTS that operates on an "alpha" channel?

  • The coast station should hear your call and respond and you will be able to receive VTS instructions.
  • The coast station will not hear your call but you will hear their responses to other vessels in the VTS area.
  • You will be able to hear the coast station calling you but will not be able to hear other vessels in the VTS area.
  • Correct Answer
    The coast station should hear your call and respond but you will not hear their response.
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