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The RF bandwidth of AM is ____________ the maximum frequency contained in the modulating message signal.

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The RF bandwidth of AM is ____________ the maximum frequency contained in the modulating message signal.

(a) Equal

(b) Two times

(c) Four times

(d) Ten times

This question was addressed to me in class test.

Question is from Amplitude Modulation in section Modulation Techniques for Mobile Radio of Wireless/Mobile

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Correct answer is (b) Two times

Explanation: The RF bandwidth of an AM signal is equal to BAM=2fm. It is double the maximum frequency contained in the modulating message signal. AM spectrum consists of an impulse at the carrier frequency and two sidebands which replicate the message spectrum.

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