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Subelement H
Modulation
Section 57
Frequency Modulation
The deviation ratio is the:
• Audio modulating frequency to the center carrier frequency.
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
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?
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.
By feeding the audio directly to the oscillator.
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What is meant by the term modulation index?
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.