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If the modulating frequency of a carrier wave varies between 100Hz and 100KHz, find it’s bandwidth?

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in Analog Communications by (122k points)
If the modulating frequency of a carrier wave varies between 100Hz and 100KHz, find it’s bandwidth?

(a) 100 KHz

(b) 230.2 KHz

(c) 199.8 KHz

(d) 123.6 KHz

The question was posed to me in exam.

This is a very interesting question from Digital Multiplexing topic in section Multiplexing & Sampling of Bandpass Signal of Analog Communications

1 Answer

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Right choice is (c) 199.8 KHz

The best explanation: fm = fmax – fmin = 100KHz – 100Hz = 99.9KHz and Bandwidth = 2fm = 2 x 99.9 = 199.8 KHz.

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