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What is the modulation index for the FM to behave as a narrowband?

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What is the modulation index for the FM to behave as a narrowband?

(a) 1

(b) 0.5

(c) 0.25

(d) 0.1

The question was asked in examination.

My question is based upon Frequency, Phase Modulation, Modulation Index and Sidebands topic in portion Amplitude & Frequency Modulation of Avionics

1 Answer

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Correct answer is (c) 0.25

Easiest explanation: When the modulation index is around 0.25 the modulation produces only single pairs of significant sidebands like that of AM. This occupies comparatively less spectrum space.

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