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If a FM signal has modulation index m, then what will be its modulation index after passing through frequency tripler?

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If a FM signal has modulation index m, then what will be its modulation index after passing through frequency tripler?

(a) ^m⁄3

(b) m

(c) 3m

(d) 9m

This question was addressed to me in final exam.

My doubt is from Noise for SSB-SC topic in portion Noise of Analog Communications

1 Answer

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The correct answer is (c) 3m

Explanation: Frequency multiplier is an electronic circuit that generates an output signal whose output frequency is a multiple of its input frequency. So after passing through frequency tripler, new modulation index will be thrice the input which is 3m.

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