7-A-088: MF-HF: ARQ Operation #1: Calling a Coast Ctation
7-88J1:
Which of the following would be a valid SELCALL for use in ARQ communications?
1106
212420 WHAQ X.
Four marks (ones) and three spaces (zeroes) forming the binary signal "1001101".
This is established by the communications protocol used with the modem.
7-88J2:
Once ARQ communication with the coast radio station has been established, which of the following exchanges will most likely take place?
After exchanging answer-backs (WRU-AAB) with the vessel, the coast radio station transmits GA+?.
The vessel then requests the coast radio station's SELCALL so that communication can be set up on the appropriate working channel.
Since communication has already shifted to the working channel, the vessel then transmits the subscriber number and text of the message to be sent for the coast radio station to store and forward.
None of the above
7-88J3:
Which of the following methods will give a GMDSS Radio Operator the best indication of whether ARQ communication can be established with a coast radio station?
Monitor the coast radio station's "free signals" and call on the frequency on which the loudest and most consistent signals are heard.
Referring to propagation charts will tell the Operator when the eruption of communication shattering solar flares will occur.
Selecting a frequency in the MF band averts interference from severe static discharges.
Re-position the radome's antenna toward the coast radio station and press the "call request" button.
7-88J4:
When placing a TELEX call to a Coast Station, you should always:
Make sure the frequency is not occupied with normal traffic.
Choose the closest station.
Tune the transmitter on another frequency.
Wait until the coast station sends his traffic list.
7-88J5:
What is the best method for a GMDSS Radio Operator to determine which SITOR station to contact for the purpose of sending a chargeable message or cable?
Listen to each station's “free signals” and call the station generating the loudest marker.
Listen to each station's voice announcement and determine which channel(s) will be monitored.
Listen to each station's MSI broadcast to determine which public correspondence station to contact.
Listen to the U.S. Coast Guard's traffic list to determine which Coast Guard station will handle commercial traffic.
7-88J6:
Which statement is correct regarding HF NBDP under GMDSS?
Safety communications by direct-printing telegraphy should be in the ARQ mode when communicating with the U.S. Coast Guard or other coast stations on channels that they normally guard.
Distress communications other than directly to the Coast Guard or other coast stations on the channels that they normally guard, should be in the broadcast SSB mode.
The ARQ mode may not be used subsequently to the FEC mode even when it is advantageous to do so.
Distress communications other than directly to the Coast Guard or other coast stations on the channels that they normally guard, should be in the broadcast FEC or SSB mode.
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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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