7R-A-23: Radio silence & resumption of normal traffic
7R-23D1:
What is the fundamental purpose for imposing radio silence?
To ensure that interference on a particular frequency or channel for communications concerning emergency traffic is minimized.
To ensure that interference to proprietary communications is minimized.
To ensure that only voice communications can be effected on the Distress frequency or channel.
To ensure that a Distressed vessel will have a "window" twice each hour for transmitting routine messages.
7R-23D2:
When can routine communications be resumed when radio silence has been imposed?
Routine communications can resume after the Rescue Coordination Center transmits a message on the frequency or channel being used for emergency communications stating that such traffic has concluded.
After determining that the frequency or channel appears to be no longer in use.
After determining that geographic distance from the Distress situation will prohibit any other signal from interfering with emergency communications.
If, in the master's opinion, communications on that frequency will interfere with emergency communications.
7R-23D3:
What is meant by the term "radio silence"?
Stations not directly involved with the on-going Distress communications may not transmit on the Distress frequency or channel.
Stations remaining off the air to safeguard proprietary information.
Two three-minute silent periods, at 15 and 45 minutes after the hour, that provide a transmitting "window" for Distressed vessels to transmit Distress alerts using J3E.
Communications on a Distress frequency or channel is banned for 24 hours following the cessation of the Distress traffic.
7R-23D4:
How is "radio silence" imposed?
By the On Scene Coordinator (OSC).
By the Coast Earth Station (CES) controlling the Distress communications on that frequency.
By the nearest Public Correspondence Coast Station.
By the vessel first responding to the Distress call.
7R-23D5:
What is the reason for imposing radio silence?
To prevent interference to distress communications.
To keep a clear channel open for safety broadcasts.
To allow individual vessels to carry out direct communications.
All of the above
7R-23D6:
How are normal working conditions restored after radio silence has been imposed?
The Rescue Coordination Center (RCC) that imposed the radio silence must transmit a voice message on the Distress frequency stating "SEELONCE FEENEE".
The Coast Earth Station (CES) that imposed the radio silence must transmit a voice message on the Distress frequency stating "SILENCE FINI".
The Public Correspondence Station (PCS) that imposed the radio silence must transmit a voice message on the Distress frequency stating "SILENCE FINI".
None of the above
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Color key:
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● = Unseen
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● = Weak
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● = Review
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● = Learned
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● = Incorrect answer
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