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Subel. H
6 questions
Subelement H
Modulation
Section 57
Frequency Modulation
The deviation ratio is the:
  • Audio modulating frequency to the center carrier frequency.
  • Correct Answer
    Maximum carrier frequency deviation to the highest audio modulating frequency.
  • Carrier center frequency to the audio modulating frequency.
  • Highest audio modulating frequency to the average audio modulating frequency.
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What is the deviation ratio for an FM phone signal having a maximum frequency deviation of plus or minus 5 kHz and accepting a maximum modulation rate of 3 kHz?
  • 60
  • 0.16
  • 0.6
  • Correct Answer
    1.66

Deviation Ratio is the maximum frequency deviation divided by the maximum modulation rate.

5 kHz / 3 kHz = 1.66

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What is the deviation ratio of an FM-phone signal having a maximum frequency swing of plus or minus 7.5 kHz and accepting a maximum modulation rate of 3.5 kHz?
  • Correct Answer
    2.14
  • 0.214
  • 0.47
  • 47

7.5 kHz / 3.5 kHz = 2.14

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How can an FM-phone signal be produced in a transmitter?
  • By modulating the supply voltage to a class-B amplifier.
  • By modulating the supply voltage to a class-C amplifier.
  • By using a balanced modulator.
  • Correct Answer
    By feeding the audio directly to the oscillator.
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What is meant by the term modulation index?
  • Correct Answer
    The ratio between the deviation of a frequency modulated signal and the modulating frequency.
  • The processor index.
  • The FM signal-to-noise ratio.
  • The ratio of the maximum carrier frequency deviation to the highest audio modulating frequency.
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In an FM-phone signal, what is the term for the maximum deviation from the carrier frequency divided by the maximum audio modulating frequency?
  • Deviation index.
  • Modulation index.
  • Correct Answer
    Deviation ratio.
  • Modulation ratio.
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