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Subelement A
RADAR Principles
Section 3
Frequency and Wavelength
Frequencies generally used for marine RADAR are in the ___ part of the radio spectrum.
  • UHF
  • EHF
  • Correct Answer
    SHF
  • VHF
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Practical RADAR operation requires the use of microwave frequencies so that:
  • Correct Answer
    Stronger target echoes will be produced.
  • Ground clutter interference will be minimized.
  • Interference to other communication systems will be eliminated.
  • Non-directional antennas can be used for both transmitting and receiving.
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An S-band RADAR operates in which frequency band?
  • 1 - 2 GHz.
  • 4 - 8 GHz.
  • 8 - 12 GHz.
  • Correct Answer
    2 - 4 GHz.
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A RADAR operating at a frequency of 3 GHz has a wavelength of approximately:
  • 1 centimeter.
  • Correct Answer
    10 centimeters.
  • 3 centimeters.
  • 30 centimeters.
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The major advantage of an S-band RADAR over an X-band RADAR is:
  • Correct Answer
    It is less affected by weather conditions.
  • It has greater bearing resolution.
  • It is mechanically less complex.
  • It has greater power output.
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An X band RADAR operates in which frequency band?
  • 1 - 2 GHz.
  • 2 - 4 GHz.
  • 4 - 8 GHz.
  • Correct Answer
    8 - 12 GHz.
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