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What is the bandwidth of the signal if the highest frequency in the modulating signal is 3 KHz?

(a) 6Khz

(b) 3KHz

(c) 5Khz

(d) 140Khz

This question was posed to me in quiz.

Origin of the question is Sidebands and Frequency Domain topic in section Amplitude & Frequency Modulation of Avionics

1 Answer

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Right option is (a) 6Khz

For explanation I would say: Bandwidth of a signal is twice the highest frequency of the modulating signal. Thus, bandwidth = 2 x 3KHz = 6KHz.

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