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What is the modulation index of a system with modulating frequency 75kHz and maximum frequency deviation 15kHz?

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What is the modulation index of a system with modulating frequency 75kHz and maximum frequency deviation 15kHz?

(a) 5

(b) 7

(c) 3

(d) 1

I have been asked this question during an online exam.

I would like to ask this question from Frequency, Phase Modulation, Modulation Index and Sidebands topic in section Amplitude & Frequency Modulation of Avionics

1 Answer

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The correct answer is (a) 5

Explanation: Modulation index= mf = ^fd⁄fm = ^75⁄15 = 5.

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