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Subel. D
6 questions
Subelement D

Display & Control Systems

Section 33

Variable Range Markers

The variable range marker signal is normally fed to the input of the:

  • Sweep amplifier.
  • Low voltage power supply regulator.
  • Correct Answer
    Video amplifier.
  • Range ring oscillator.
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The purpose of the variable range marker is to:

  • Correct Answer
    Provide an accurate means of determining the range of a moving target.
  • Provide a bearing line between own ship and a moving target.
  • Indicate the distance between two different targets.
  • Provide a means of calibrating the fixed range rings.
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How is the variable range marker usually adjusted for accuracy?

  • Adjusting the frequency of the VRM oscillator at the maximum range.
  • Adjusting the frequency of the VRM oscillator at the minimum range.
  • Adjusting the readout to match at the median range ring.
  • Correct Answer
    The minimum and maximum ranges are aligned with the matching fixed range ring.
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The panel control for the variable range marker is normally a:

  • Correct Answer
    Variable resistor.
  • Variable inductance.
  • Variable capacitance.
  • Variable resolver.
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An important component of the VRM system is the:

  • Resolver.
  • Interference rejection circuit.
  • STC sensitivity control.
  • Correct Answer
    Shift register.
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Which of the following statements about the Variable Range Marker system is correct?

  • The VRM is an auxiliary output of the fixed range marker oscillator.
  • Correct Answer
    The VRM system develops a single adjustable range ring.
  • The VRM system is calibrated using a frequency counter.
  • The VRM system is controlled by a crystal oscillator.
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