7-A-078: INMARSAT Equipment Faults and Maintenance-2
7-78I1:
What immediate remedy can be used to correct shadowing of the satellite signal by a shipboard obstruction?
Change the ship's course.
Relocate the mast or other obstruction.
Raise the transmit power level.
Increase the receiver gain.
7-78I2:
A vessel loses Inmarsat-B SES operation after a large course change. Which of the following could cause this?
System loses gyro follow-up or a gyro system malfunction.
Shadowing of the SES antenna by clouds or other weather formations.
Misalignment of the shadow correction filter.
None of these
7-78I3:
Which statement is correct regarding a method that a vessel experiencing problems with shadowing of the Inmarsat-B SES antenna by an on-board obstruction could use to attempt reliable communications?
Change course to make the communications.
Change the Coast Station ID programming.
Install a shadow correction filter.
Switch from TELEX to voice mode which requires lower signal strength for proper operation.
7-78I4:
Which of the following conditions can render Inmarsat-B communications impossible?
All of these
An obstruction, such as a mast, causing disruption of the signal between the satellite and the SES antenna when the vessel is steering a certain course.
A satellite whose signal is on a low elevation, below the horizon.
Travel beyond the effective radius of the satellite.
7-78I5:
A vessel is experiencing problems tracking the satellite in an Inmarsat-C SES. The problem could be:
All of these
Extremely heavy rain/snow storms.
Shadowing caused by an obstacle, such as a mast, between the SES antenna and the satellite.
The vessel is on the fringe of the coverage area of the satellite.
7-78I6:
Which functions may the holder of a GMDSS Radio Operator License perform on the Inmarsat-C equipment?
All of these
Selection of CES.
Maintain the antenna clear of soot, paint, etc.
Logon, traffic and logoff functions.
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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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