Section-I: Inmarsat Equip. & Comms: Key Topic #79: Equipment Faults and Maintenance-2:

79I1 What immediate remedy can be used to correct shadowing of the satellite signal by a shipboard obstruction?

A. Relocate the mast or other obstruction.

B. Raise the transmit power level.

C. Change the ship's course.

D. Increase the receiver gain.

79I2 A vessel loses Inmarsat-B SES operation after a large course change. Which of the following could most likely cause this?

A. Shadowing of the SES antenna by clouds or other weather formations.

B. Misalignment of the shadow correction filter.

C. The vessel sailed beyond the footprint of the satellite coverage.

D. System loses gyro follow-up or a gyro system malfunction.

79I3 Which statement is correct regarding a method that a vessel experiencing problems with shadowing of an Inmarsat-B (or F77) SES antenna by an on-board obstruction could use to attempt reliable communications?

A. Change course to remove the shadow.

B. Change the Coast Station ID programming.

C. Install a shadow correction filter.

D. Switch from TELEX to voice mode.

79I4 Which of the following conditions does not typically impair Inmarsat-B communications ?

A. An obstruction, such as a mast, blocking the signal between the satellite and the SES antenna when the vessel is steering a specific course.

B. Normal precipitation from gales and storms.

C. A satellite whose signal is on a low elevation, below the horizon.

D. Travel beyond the effective radius of the satellite.

79I5 A vessel is experiencing problems tracking the satellite in an Inmarsat-C SES while at sea. The problem is least likely caused by?

A. Extremely heavy rain/snow storms.

B. Local RF interference by in-port cell phone or other radio systems.

C. Shadowing caused by an obstacle, such as a mast, between the SES antenna and the satellite.

D. The vessel is on the fringe of the coverage area of the satellite.

79I6 Which functions may the holder of a GMDSS Radio Operator License not perform on the Inmarsat-C equipment?

A. Selection of LES for routine traffic.

B. Maintain the antenna clear of soot, paint, etc.

C. Adjust the azimuth and elevation values.

D. Logon, traffic and logoff functions.

Answers: 79I1 - C 79I2 - D 79I3 - A 79I4 - B 79I5 - B 79I6 - C

Section-j: mf-hf Equip. And Comms: Key Topic #80: mf-hf Panel Controls:

80J1 Which modes could be selected to receive vessel traffic lists from high seas coast radio stations:

A. AM and VHF-FM

B. SSB and FEC

C. ARQ and FEC

D. VHF-FM and SSB

80J2 MF/HF Transceiver Power levels should be set:

A. To the highest possible level to ensure effective communications.

B. To the lowest possible level at all times regardless of whether communications are effective.

C. To the lowest level needed to achieve the necessary propagation radius and communications range.

D. To the highest level possible so as to ensure other stations cannot "break-in" on the channel during use.

80J3 Which statement regarding GMDSS MF/HF Transceiver frequency set-up is true:

A. Manual keypad entries are quicker and more certain than using the database.

B. All consoles ensure that manual keypad entries are checked for legal outcomes.

C. All consoles ensure that ITU channel recall from a database produces accurate and legal outcomes.

D. Using the manufacturer’s database typically produces a more swift and certain result.

80J4 Which statement regarding GMDSS MF/HF Transceiver frequency set-up is true:

A. Some consoles allow both manual keypad entry and ITU channel recall from a database or memory.

B. Transmit and receive frequencies must always be manually entered from the keypad.

C. Transmit and receive frequencies must always be recalled from a database or memory.

D. Frequencies in the manufacturer’s databases are always accurate and legal for use.

80J5 To set-up the MF/HF Transceiver for a TELEX call to a coast station, the operator must:

A. Select J3E mode for proper SITOR (NBDP) operations.

B. Select F1B/J2B modes or J3E mode, depending on whether ARQ or FEC is preferred.

C. Select J3E mode for ARQ and H3E mode for FEC.

D. Select F1B mode or J2B mode, depending on the equipment manufacturer.

80J6 To set-up the MF/HF Transceiver for a voice call to a coast station, the operator must:

A. Select J3E mode for proper voice operations.

B. Select J3E mode for proper SITOR (NBDP) operations.

C. Select F1B mode or J2B mode, depending on the equipment manufacturer.

D. Select F1B/J2B modes or J3E mode, depending on whether FEC or ARQ is preferred.

Answers: 80J1 - B 80J2 - C 80J3 - D 80J4 - A 80J5 - D 80J6 - A