FCC Commercial Element 7 pool, section 78

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Subelement I

Inmarsat Equip. & Comms:

Section 78

Equipment Faults and Maintenance-1

78I1

A vessel with an 18-hour ETA to the Panama Canal on a voyage from Miami loses the ability to communicate via Inmarsat-C. The most likely cause is?

A.
The vessel has sailed beyond the coverage area of the Southbury Land Earth Station.
B.
The vessel has sailed beyond the coverage area of the Eastern Atlantic satellite.
C.
The vessel has sailed beyond the coverage area of the Western Atlantic satellite.
Correct Answer
D.
An equipment fault resulting in a loss of signal from the satellite.

78I1

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78I2

A vessel, before transiting the Panama Canal, on a voyage from Hawaii to Florida, loses the ability to communicate via Inmarsat-C. The most likely cause is:

Correct Answer
A.
The vessel has sailed beyond the coverage area of the Pacific satellite.
B.
The vessel has sailed beyond the coverage area of the Santa Paula Land Earth Station.
C.
The vessel has sailed beyond the coverage area of the Western Atlantic satellite.
D.
The satellite orbit is beyond the usable range of the SES.

78I2

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78I3

What would cause an FBB antenna to lose constant lock on the satellite?

A.
An indication on a meter or on the display terminal of lowered transmit power.
Correct Answer
B.
Loss of the internal antenna pitch/roll sensors (IMS).
C.
An indication of a very high antenna elevation on the display terminal screen.
D.
An indication that the antenna has reached its maximum travel in one direction.

78I3

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78I4

What maintenance function may the holder of a GMDSS Radio Operator license perform, or supervise the performance of, on an Inmarsat-C SES?

A.
Adjust the station's EIRP (power output) for improved signal levels.
B.
Enter Azimuth and Elevation values correctly so the Inmarsat-C SES can find the NCS CC.
Correct Answer
C.
Remove stack deposits and other debris from the antenna to prevent degraded performance.
D.
Adjust a reference oscillator or synthesizer to tune the unit to the NCS CC.

78I4

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78I5

What maintenance function may the holder of a GMDSS Radio Operator license perform, or supervise the performance of, on an Inmarsat-C SES?

A.
Painting the antenna dome.
B.
Adjust the station's EIRP.
Correct Answer
C.
Adjust any front panel controls.
D.
Adjust a reference oscillator or synthesizer.

78I5

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78I6

Which functions may the holder of a GMDSS Radio Operator License NOT perform on the Inmarsat-C equipment?

A.
Maintain the antenna clear of soot, paint, etc.
B.
Log-on, traffic and log-off functions.
C.
Entry of position data and selection of LES.
Correct Answer
D.
Optimize performance by adjusting the transmitter EIRP.

78I6

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