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Subelement I
Inmarsat Equip. & Comms:
Section 64
Inmarsat-B or F77 Equipment and Operations:
How is a signal radiated from an Inmarsat-B or F77 system's antenna?
  • 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.
  • Correct Answer
    It is a highly focused directional signal that must be beamed at the desired satellite.
  • 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.
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Which mode of Inmarsat-B communications may be possible with a lower received signal strength?
  • Fax
  • Voice Communications
  • Correct Answer
    TELEX
  • Binary computer file transfers
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What is the purpose of the second I.D. in an Inmarsat-B or F77 SES?
  • 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.
  • Correct Answer
    To provide an additional number which may be dedicated to computers, fax, etc.
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What is the effect of having five periods (e.g. .....) in the text of a TELEX transmission on an Inmarsat-B SES?
  • Correct Answer
    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.
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Why is the automatic answerback request (WRU) first used by the LES after an Inmarsat-B TELEX call has been placed from a ship?
  • Let the LES 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.
  • Correct Answer
    Identify the SES making the request.
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When engaging in voice communications via an Inmarsat-B of F77 terminal, what procedures are used?
  • Correct Answer
    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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