7-A-064: INMARSAT-B Equipment and Operations
7-64I1:
How is a signal radiated from an Inmarsat-B system's antenna?
It is a highly focused directional signal that must be beamed at the desired satellite.
It is usually radiated in an omni-directional pattern, but an optional feature allows it to be directional for use when the vessel is on the fringe of the satellite's footprint.
It is radiated in an omni-directional pattern.
It is radiated in an omni-directional pattern that can be reversed by the Operator to attain directional beaming to an alternate satellite.
7-64I2:
Which mode of Inmarsat-B communications may be possible with a lower received signal strength?
TELEX
Fax
Voice Communications
Binary computer file transfers
7-64I3:
What is the purpose of the second I.D. in an Inmarsat-B SES?
To provide an additional number which may be dedicated to computers, fax, etc.
To provide an alternate number which may be called if a busy signal is received by the calling party.
To provide an additional speech path, which may be used to communicate while the first channel is engaged in active communications.
To provide for an emergency working frequency.
7-64I4:
What is the effect of having five periods (e.g.-meanwhile.....) in the text of a TELEX transmission on an Inmarsat-A SES?
The transmission will automatically terminate after those characters are transmitted.
Only the first period will be routed to the receiving party.
Only the first two periods will be routed to the receiving party.
This will automatically trigger the reversal of charges to the receiving party.
7-64I5:
Why is the automatic answerback request (WRU) first used by the CES after an Inmarsat-B TELEX call has been placed from a ship?
Identify the SES making the request.
Let the CES operator know the printer is functioning correctly.
Get the identity of the ship station and start the channel assignment process.
Verify that there is a good connection with no transmission errors.
7-64I6:
When engaging in voice communications via an Inmarsat-B terminal, what procedures are used?
CODECs are used to digitize the voice signal.
Noise-blanking must be selected by the operator.
The voice signal must be compressed to fit into the allowed bandwidth.
The voice signal will be expanded at the receiving terminal.
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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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