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A percentage of modulation greater than ___________ will distort the message signal.

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A percentage of modulation greater than ___________ will distort the message signal.

(a) 10%

(b) 25%

(c) 50%

(d) 100%

The question was asked in an interview for job.

My question is from Amplitude Modulation in division Modulation Techniques for Mobile Radio of Wireless/Mobile

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Right choice is (d) 100%

To explain I would say: A percentage of modulation greater than 100% will distort the message signal if detected by an envelope detector. In this case the lower excursion of the signal will drive the carrier amplitude below zero, making it negative (and hence changing its phase).

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