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Element 7R: Restricted GMDSS Radio Operating Practices

effective 8/01/2006

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7R-A-46: VHF: Simplex-Duplex, USA-Int

7R-46G1: The nearest Coast Guard station is being called by a vessel on Ch-22. His USA-INT switch is set to INT. What will be the results?

The Coast Guard station will probably hear the call and respond but the vessel called will not hear the response.

There should be no problem carrying on communications.

The Coast Guard station will not hear the call because he is listening on a duplex receiving frequency.

Neither station will hear the other’s calls.



7R-46G2: What is the reason for the USA-INT control or function?

It changes some channels that are normally duplex channels into simplex channels.

It changes channels that are normally simplex channels into duplex channels.

When the control is set to “INT” the range is increased.

None of the above



7R-46G3: Which of the following statements is true?

Using the “USA” setting changes certain channels from duplex to simplex operation.

You should always use the “INT” setting for calling a Public Correspondence station.

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.



7R-46G4: The USA-INT control on VHF units:

Changes selected international duplex channels to simplex channels for use in U.S. waters.

Selects duplex operations for U.S. coastal waters and simplex operations in non-U.S. waters, on the "alpha" channels.

Both of the scenarios above may be set up and selected by the operator.

None of the above



7R-46G5: The USA-INT control on VHF units:

Both a) and c) are true

Was made necessary by a desire for more simplex channels in the U.S.

Correctly set, will result in duplex operations in U.S. Coastal waters on the "alpha" channels.

Correctly set, will result in simplex operations in U.S. Coastal waters on the "alpha" channels.



7R-46G6: What would happen if your VHF is set to “USA” and you called a coast station on Ch-03?

Both a) and c) are correct

The coast station should hear your call and respond.

You will be able to conduct normal communications.

You will not be able to hear the coast station calling you.





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7R-A-45: VHF: Channel System, Usage
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Element 7R: Restricted GMDSS Radio Operating Practices
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7R-A-47: VHF-DSC Calls: Distress, Urgency and Safety
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