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Exam (elaborations)

3P QUESTIONS AND ANSWERS

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3P QUESTIONS AND ANSWERS What is the orbiting altitude of the Iridium satellite communications system? 485 miles. What frequency band is used by the Iridium system for telephone and messaging? MHz. What services are provided by the Iridium system? Digital voice and Data at 2.4 kb...

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  • September 16, 2024
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  • 2024/2025
  • Exam (elaborations)
  • Questions & answers
  • 3p
  • 3p
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3P QUESTIONS AND ANSWERS

What is the orbiting altitude of the Iridium satellite communications system? -
answer485 miles.

What frequency band is used by the Iridium system for telephone and messaging? -
answer1616 -1626 MHz.

What services are provided by the Iridium system? - answer Digital voice and Data at
2.4 kbps.

Which of the following statements about the Iridium system is true? - answer There are
48 spot beams per satellite with a footprint of 30 miles in diameter.

What is the main function of the COSPAS-SARSAT satellite system? - answer Monitor
406 MHz for distress calls from EPIRBs.

How does the COSPAS-SARSAT satellite system determine the position of a ship in
distress? - answerBy measuring the Doppler shift of the 406 MHz signal taken at
several different points in its orbit.

What is the orbital altitude of INMARSAT Satellites? - answer22,177 miles.

Which of the following describes the INMARSAT Satellite system? - answerAOR-E at
15.5° W, AOR-W at 54° W, POR at 178° E and IOR at 64.5° E.

What are the directional characteristics of the INMARSAT-C SES antenna? -
answerOmnidirectional.

When engaging in voice communications via an INMARSAT-B terminal, what
techniques are used? - answerCODECs are used to digitize the voice signal.

Which of the following statements concerning INMARSAT geostationary satellites is
true? - answerThey provide coverage to vessels in nearly all of the world's navigable
waters.

Which of the following conditions can render INMARSAT -B communications
impossible? - answerAll of these.

What is the best description for the INMARSAT-C system? - answerIt is a store-and-
forward system that provides routine and distress communications.

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