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Subelement F
Receivers
Section 41
Receiver Theory
What is the limiting condition for sensitivity in a communications receiver?
  • Correct Answer
    The noise floor of the receiver.
  • The power supply output ripple.
  • The two-tone intermodulation distortion.
  • The input impedance to the detector.
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What is the definition of the term “receiver desensitizing”?
  • A burst of noise when the squelch is set too low.
  • Correct Answer
    A reduction in receiver sensitivity because of a strong signal on a nearby frequency.
  • A burst of noise when the squelch is set too high.
  • A reduction in receiver sensitivity when the AF gain control is turned down.
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What is the term used to refer to a reduction in receiver sensitivity caused by unwanted high-level adjacent channel signals?
  • Correct Answer
    Desensitizing.
  • Intermodulation distortion.
  • Quieting.
  • Overloading.
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What is meant by the term noise figure of a communications receiver?
  • The level of noise entering the receiver from the antenna.
  • The relative strength of a received signal 3 kHz removed from the carrier frequency.
  • Correct Answer
    The level of noise generated in the front end and succeeding stages of a receiver.
  • The ability of a receiver to reject unwanted signals at frequencies close to the desired one.
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Which stage of a receiver primarily establishes its noise figure?
  • The audio stage.
  • Correct Answer
    The RF stage.
  • The IF strip.
  • The local oscillator.
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What is the term for the ratio between the largest tolerable receiver input signal and the minimum discernible signal?
  • Intermodulation distortion.
  • Noise floor.
  • Noise figure.
  • Correct Answer
    Dynamic range.
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