Discussion
Consider the following statements about full-carrier AM.
1. Bandwidth is twice the highest message frequency
2. At best a third of the power carries information
3. Coherent detection is required at the receiver
Which of the statements given above is or are correct?
Answer: C
The first two are correct and the third is the distinguishing point of full-carrier AM: because the carrier is present the envelope follows the message, so a simple diode detector suffices and no coherent reference is needed. That cheapness is the whole commercial argument for the scheme, and it is what suppressed-carrier systems trade away in exchange for power efficiency. Requiring coherent detection is a property of DSB-SC and SSB.
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