Calculation of bandwidth in FM signal

Determine the Bandwidth of a FM wave when the maximum deviation allowed is 75KHz and the modulating signal has a frequency of 10KHz.


a) 170 KHz
b) 200 KHz
c) 100 KHz
d) 1000 KHz

Correct Answer: a) 170 KHz


Modulating frequency fm= 10 KHz
Frequency deviation Δf = 75 KHz
According to Carson’s rule, BW= 2(Δf + fm)
= 2(75 + 10)
= 170 KHz
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