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Subelement B
Transmitting Systems
Section 13
Modulation
In a solid-state RADAR modulator, the duration of the transmitted pulse is determined by:
  • The thyratron.
  • The magnetron voltage.
  • Correct Answer
    The pulse forming network.
  • The trigger pulse.
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The modulation frequency of most RADAR systems is between:
  • Correct Answer
    60 and 500 Hz.
  • 3000 and 6000 Hz.
  • 1500 and 7500 Hz.
  • 1000 and 3000 Hz.
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A shipboard RADAR uses a PFN driving a magnetron cathode through a step-up transformer. This results in which type of modulation?
  • Frequency modulation.
  • Amplitude modulation.
  • Continuous Wave (CW) modulation.
  • Correct Answer
    Pulse modulation.
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In a pulse modulated magnetron what device determines the shape and width of the pulse?
  • Correct Answer
    Pulse Forming Network.
  • Thyratron.
  • LC parallel circuit.
  • Dimensions of the magnetron cavity.
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What device(s) may act as the modulator of a RADAR system?
  • Magnetron.
  • Klystron.
  • Video amplifier.
  • Correct Answer
    Thyratron or a silicon-controlled rectifier (SCR).

These are used to switch the transmitter's very high voltage (rf) ON & OFF in response to a control signal.

Thyratron's are the older Tube style, SCR (Silicon Controlled Rectifiers) are the more modern Solid State device, but they both do the same thing.

Turn ON/OFF or "Modulates the signal"

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The purpose of a modulator in the transmitter section of a RADAR is to:
  • Improve bearing resolution.
  • Correct Answer
    Provide the correct waveform to the transmitter.
  • Prevent sea return.
  • Control magnetron power output.
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