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Subel. C
6 questions
Subelement C

Receiving Systems

Section 28

Miscellaneous

The purpose of the discriminator circuit in a RADAR set is to:

  • Discriminate against nearby objects.
  • Discriminate against two objects with very similar bearings.
  • Correct Answer
    Generate a corrective voltage for controlling the frequency of the klystron local oscillator.
  • Demodulate or remove the intelligence from the FM signal.
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The MTI circuit:

  • Acts as a mixer in a RADAR receiver.
  • Correct Answer
    Is a filter, which blocks out stationary targets, allowing only moving targets to be detected.
  • Is used to monitor transmitter interference.
  • Will pick up targets, which are not in motion.
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Where is a RF attenuator used in a RADAR unit?

  • Between the antenna and the receiver.
  • Between the magnetron and the antenna.
  • Correct Answer
    Between the magnetron and the AFC section of the receiver.
  • Between the AFC section and the klystron.
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The condition known as "glint" refers to a shifting of clutter with each RADAR pulse and can be caused by a:

  • Correct Answer
    Improperly functioning MTI filter.
  • Memory failure.
  • Low AFC voltage.
  • Interference from electrical equipment.
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An ion discharge (TR) cell is used to:

  • Protect the transmitter from high SWRs.
  • Lower the noise figure of the receiver.
  • Tune the local oscillator of the RADAR receiver.
  • Correct Answer
    Protect the receiver mixer during the transmit pulse.
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When the receiver employs an MTI circuit:

  • The receiver gain increases with time.
  • Correct Answer
    Only moving targets will be displayed.
  • The receiver AGC circuits are disabled.
  • Ground clutter will be free of "rabbits."
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