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Subel. B
6 questions
Subelement B

Transmitting Systems

Section 17

Timer - Trigger - Synchronizer Circuits

What RADAR circuit determines the pulse repetition rate (PRR)?

  • Discriminator.
  • Correct Answer
    Timer (synchronizer circuit).
  • Artificial transmission line.
  • Pulse-rate-indicator circuit.
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The triggering section is also known as the:

  • PFN.
  • Timer circuit.
  • Blocking oscillator.
  • Correct Answer
    Synchronizer.
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Operation of any RADAR system begins in the:

  • Correct Answer
    Triggering section.
  • Magnetron.
  • AFC.
  • PFN.
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The timer circuit:

  • Determines the pulse repetition rate (PRR).
  • Determines range markers.
  • Provides blanking and unblanking signals for the CRT.
  • Correct Answer
    All of the above
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Pulse RADARs require precise timing for their operation. Which type circuit below might best be used to provide these accurate timing pulses?

  • Correct Answer
    Single-swing blocking oscillator.
  • AFC controlled sinewave oscillator.
  • Non-symmetrical astable multivibrator.
  • Triggered flip-flop type multivibrator.
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Unblanking pulses are produced by the timer circuit. Where are they sent?

  • IF amplifiers.
  • Mixer.
  • Correct Answer
    CRT.
  • Discriminator.

hint: Timer Circuit - CRT - KD9TIP

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