Maximum frequency deviation and the maximum bandwidth in commercial FM broadcast

Q.  Maximum frequency deviation and the maximum bandwidth allowed for commercial FM broadcast is
- Published on 14 Oct 15

a. 80KHz, 160Khz
b. 75KHz, 200Khz
c. 60KHz, 170Khz
d. 75KHz, 250Khz

ANSWER: 75KHz, 200Khz
 
Maximum frequency deviation allowed for commercial FM broadcast is 75KHz. Therefore approximate bandwidth allowed is 2 * 75 = 150KHz. Guard bands of 25KHz are allowed on the either sides so the channel width becomes 2 (75 + 25) = 200KHz. The guard bands are added to prevent the interference between adjacent channels.

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