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In case of FM, if the modulating frequency is lowered and the modulating voltage remains constant then the amplitude of distant sidebands first increases and then decreases.

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In case of FM, if the modulating frequency is lowered and the modulating voltage remains constant then the amplitude of distant sidebands first increases and then decreases.

(a) True

(b) False

I had been asked this question in examination.

Origin of the question is Singletone SSB Modulation topic in division SSB Modulation of Analog Communications

1 Answer

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Correct choice is (b) False

Best explanation: If the modulating frequency in FM lowered and the modulating voltage remains constant then the amplitude of distant sidebands increases, as the modulating frequency has no role to play in determining the amplitude of the sidebands.

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