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Subel. C
6 questions
Subelement C
Satellite Systems:
Section 29
Antenna Systems:
Which of the following best describes the polarization of a satellite signal?
  • Correct Answer
    The orientation of the RF signal's electric field component.
  • The orientation of the RF signal relative to a dipole antenna.
  • The orientation of the RF signal relative to a parabolic antenna.
  • The orientation of the RF signal's magnetic field component.
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Which of the following is characteristic of the parabolic dish antenna?
  • Feedhorn located behind the parabolic reflector.
  • Correct Answer
    Feedhorn adjusted to the focal point of the antenna.
  • Most often used on high frequencies (3-30 MHz).
  • Low gain, highly directional radiation pattern.
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Which of the following best describes a phased array antenna system?
  • RF from the feedline array is dissipated by a single antenna element.
  • RF from a multiple feedline array is dissipated by a single antenna element.
  • Correct Answer
    RF from multiple antennas is varied to produce a desired radiation pattern.
  • RF from multiple antennas is combined to produce unity gain.
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Which of the following is characteristic of an Inmarsat-C antenna?
  • The antenna is RHC polarized with a cardioid radiation pattern.
  • The antenna is vertically polarized and highly directional.
  • The antenna is horizontally polarized and omni-directional.
  • Correct Answer
    The antenna is RHC polarized with an omni-directional radiation pattern.
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What is a best practice for installing Inmarsat satellite antennas aboard ship?
  • Correct Answer
    Install antennas as high as practical, free from shadowing of structures.
  • Install antennas next to other Inmarsat antennas, away from structures.
  • Connect the antenna to transmission line with the highest characteristic impedance.
  • Install an inline filter with the transmission line to attenuate frequencies above 1 GHz.
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What components does an Inmarsat Fleet Broadband RADOME typically include?
  • Phased array antenna, gyro-stabilized platform, rotary joint, AC power supply.
  • Correct Answer
    Stabilized antenna, RF unit, Antenna Control Unit, GPS antenna.
  • Parabolic dish antenna, Main Control Unit, rotary joint, HV power supply.
  • Parabolic dish antenna, rotary joint, AC power supply TDMA Control Unit.
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