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What is the bandwidth of a FM wave when maximum allowed deviation is 50KHz and the modulating signal has a frequency of 15KHz?

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What is the bandwidth of a FM wave when maximum allowed deviation is 50KHz and the modulating signal has a frequency of 15KHz?

(a) 130 KHz

(b) 260 KHz

(c) 65 KHz

(d) 50 KHz

The question was asked in final exam.

The doubt is from Coherent Detection of DSBSC Waves in portion Double Sideband Suppressed Carrier Modulation of Analog Communications

1 Answer

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Correct answer is (a) 130 KHz

Easy explanation: According to Carson s rule, B = 2(fd +fm) = 2 (50 + 15) = 130 KHz.

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