An FM signal for broadcast in the 88-108 MHz range, band

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An FM signal for broadcast in the 88-108 MHz range, band has a frequency deviation of 15 kHz. Find the% modulation of this signal—

1. 40%
2. 20%
3. 66%
4. 50%

Correct Option: B

As we know that in band (88–108) MHz, the maximum frequency deviation is ± 75kHz and given signal have frequency deviation of 15 kHz so% modulation given by

% modulation =	15kHz	×100
	75kHz

= 20 %