A frequency-modulated (FM) signal with a frequency deviation of 75 kHz

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Module 1: Analog Modulation

20242m

A frequency-modulated (FM) signal with a frequency deviation of 75 kHz and a modulating frequency of 5 kHz has a modulation index of:
(i) 15
(ii) 50
(iii) 75
(iv) 100

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Answer

Correct Option: (i) $15$

Explanation

FM index $\beta=\Delta f/f_m=75\text{kHz}/5\text{kHz}=15$ .

Final Answer

$15$ → Option (i).

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