Calculation of bandwidth in FM signal

Q.  Determine the Bandwidth of a FM wave when the maximum deviation allowed is 75KHz and the modulating signal has a frequency of 10KHz.
- Published on 15 Oct 15

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

ANSWER: 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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