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FM signals have all their information in ______ of the carrier.

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FM signals have all their information in ______ of the carrier.

(a) Amplitude

(b) Magnitude

(c) Frequency

(d) Power

The question was posed to me during an interview.

This interesting question is from Frequency Modulation Vs. Amplitude Modulation topic in chapter Modulation Techniques for Mobile Radio of Wireless/Mobile

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The correct answer is (c) Frequency

The explanation is: FM signal have all their information in the phase or frequency of the carrier. This provides a nonlinear and very rapid improvement in reception quality once a certain minimum received signal level, called FM threshold is achieved.

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