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Subelement I
Inmarsat Equip. & Comms:
Section 67
Compare and Differentiate "B" and "C" Terminals:
Which statement concerning Inmarsat-B and Inmarsat-C terminals is correct?
  • Both Inmarsat-B and Inmarsat-C units are capable of fax and voice communications.
  • Inmarsat-B units are not capable of data communications, but Inmarsat-C units are capable of data communications.
  • Correct Answer
    Both Inmarsat-B and Inmarsat-C units can send data as well as send messages to fax machines.
  • None of these answers is correct.
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When Inmarsat-B and Inmarsat-C terminals are compared:
  • Inmarsat-B antennas are larger, but omni-directional, while Inmarsat-C antennas are smaller and parabolic, for aiming at the satellite.
  • Inmarsat-B antennas are parabolic and smaller for higher gain, while Inmarsat-C antennas are larger but omni-directional.
  • Inmarsat-C antennas are smaller, but omni-directional, while Inmarsat-B antennas are parabolic for lower gain.
  • Correct Answer
    Inmarsat-B antennas are larger, but directional for higher gain, while Inmarsat-C antennas are smaller and non-parabolic, and do not require aiming at the satellite.
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Which statement concerning Inmarsat-B and Inmarsat-C terminals is correct?
  • Correct Answer
    Inmarsat-B terminals require AZ/EL setup and gyro input, in order to enable automatic satellite tracking.
  • Inmarsat-B terminals require gyro and GPS input, in order to enable automatic satellite tracking.
  • Inmarsat-C terminals require only GPS input, in order to enable automatic satellite tracking.
  • Inmarsat-C terminals require AZ/EL setup and GPS input, in order to enable automatic satellite tracking.
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When Inmarsat-B and Inmarsat-C terminals are compared:
  • Inmarsat-C antennas are smaller, with active parabolic antennas but no rewind capability.
  • Correct Answer
    Inmarsat-C antennas are smaller, with passive non-parabolic antennas but no rewind capability.
  • Inmarsat-B antennas are larger, with passive non-parabolic antennas that require rewind capability.
  • Inmarsat-B antennas are larger, with stationary parabolic antennas but no rewind capability.
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Which statement concerning Inmarsat-B and Inmarsat-C terminals is correct?
  • Both Inmarsat-B and Inmarsat-C units are subject to shadowing effects due to their omni-directional antennas.
  • Correct Answer
    Both Inmarsat-B and Inmarsat-C units are subject to shadowing effects, but Inmarsat-B units have directional antennas.
  • Both Inmarsat-B and Inmarsat-C units are subject to shadowing effects, but Inmarsat-C units have directional antennas.
  • Both Inmarsat-B and Inmarsat-C units are subject to shadowing effects, due to their directional antennas.
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When Inmarsat-B and Inmarsat-C terminals are compared:
  • Inmarsat-B units provide greater communications capabilities, with the benefits of greater size, weight, installation expense and initial cost.
  • Inmarsat-C provides lesser communications capabilities, with the trade-offs of greater size, weight, installation expense and initial cost.
  • Correct Answer
    Inmarsat-B units provide greater communications capabilities, with the trade-offs of greater size, weight, installation expense and initial cost.
  • Inmarsat-C units are of smaller size, weight, installation expense and initial cost and provide greater communications capabilities due to modern technology.
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