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Subelement A
VHF-DSC Equipment & Operation:
Section 3
Receiver Technology:
Which of the following best describes the "Capture effect?"
  • The receiver will accept all signals near the operating frequency.
  • The receiver will reject all but the weakest signal.
  • Correct Answer
    The receiver will reject all but the strongest signal.
  • The receiver will modulate an adjacent transmitter.
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Which of the following may be adjusted in a FM ratio detector for improved signal-to-noise?
  • The diode detector
  • Input signal to the two diodes
  • Input voltage to the transistor
  • Correct Answer
    Ratio Arm balance control bridge
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What is the function of a properly adjusted limiter circuit?
  • Correct Answer
    Maintains a constant output amplitude with a varying input amplitude.
  • Limits the level of RF output power in the final amplifier stage.
  • Limits the modulation input amplitude while amplifying the modulation output.
  • Controls the DC input voltage excursions of the final amplifier stage.
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Which of the following are true about SINAD measurements?
  • SINAD is the product of the signal and noise divided by the sum of the noise and distortion.
  • Correct Answer
    SINAD is the sum of the signal, noise and distortion divided by the sum of the noise and distortion.
  • SINAD is the sum of the noise and distortion divided by the sum of the signal, noise and distortion.
  • SINAD is the product of the noise and distortion divided by the sum of the signal and noise.

Signal-to-noise and distortion ratio (SINAD) Wiki

SINAD is a receiver audio quality measurement that is typically used for mobile stations operating on an analog system, such as AMPS. It is the ratio of Signal+Noise+Distortion divided by Noise+Distortion, expressed in dB.

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What would be considered a normal sensitivity for 10 db of quieting in a VHF marine receiver?
  • 0.1 microvolt
  • Correct Answer
    1 microvolt
  • 5 microvolts
  • 10 microvolts
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What is meant by "full quieting" in a FM VHF receiver?
  • Adjusting the squelch control to eliminate background noise.
  • The rapid decrease in SINAD and noise with increasing signal level.
  • Correct Answer
    The received signal is strong enough to completely quiet the receiver background noise.
  • The rapid improvement in SINAD and decrease in noise with decreasing signal level.
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