Maximum frequency deviation and the maximum bandwidth in commercial FM broadcast

Maximum frequency deviation and the maximum bandwidth allowed for commercial FM broadcast is

Options:

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

Correct Answer: b) 75KHz, 200Khz

Explanation:

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.