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Which one of the following is not true with respect to amplitude modulation?

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Which one of the following is not true with respect to amplitude modulation?

(a) Less noise

(b) Longer range

(c) Lower bandwidth

(d) Less complex circuits

The question was posed to me by my college professor while I was bunking the class.

This interesting question is from Modulation and Multiplexing topic in division Introduction to Electronic Communication of Avionics

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Right answer is (a) Less noise

The best I can explain: Although AM is much simpler and has a wider range due to atmospheric propagation, one of its major disadvantages is due to noise. Noise directly affects the amplitude of the signal and its hard to retrieve the original information.

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