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Which of the following is not necessarily an advantage of FM over AM?

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Which of the following is not necessarily an advantage of FM over AM?

(a) less modulating power is required

(b) better noise immunity is provided

(c) higher bandwidth is required

(d) carrier is of any shape

The question was asked in an online quiz.

My question is from Comparison Between FM and PM in portion Noise of Analog Communications

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Right choice is (c) higher bandwidth is required

The explanation: In frequency modulation, frequency of carrier gets varied with respect to the wave being propagated. FM has many advantages over AM but requirement of higher bandwidth is not an efficient condition.

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