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Frequency modulation index defines the relationship between the ______ and bandwidth of transmitted signal.

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Frequency modulation index defines the relationship between the ______ and bandwidth of transmitted signal.

(a) Frequency of message signal

(b) Amplitude of message signal

(c) Amplitude of carrier signal

(d) Frequency of carrier signal

This question was addressed to me in examination.

The query is from Angle modulation topic in division Modulation Techniques for Mobile Radio of Wireless/Mobile

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The correct option is (b) Amplitude of message signal

To elaborate: The frequency modulation index defines the relationship between the message amplitude and the bandwidth of the transmitted signal. If the modulating signal is a low pass signal, maximum bandwidth of the modulating signal is equal to the highest frequency component present in the modulating signal.

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