Discussion
Why is full-carrier AM described as power-inefficient?
Answer: A
Because at best two thirds of the radiated power sits in a carrier that conveys nothing, the information residing entirely in the sidebands. That is the argument for DSB-SC and SSB, which remove the carrier and, in the latter case, one sideband too. Propagation does not discriminate between carrier and sidebands. Class C operation is actually efficient in the amplifier sense, which is a separate meaning of the word. And an envelope detector uses both sidebands rather than discarding one.
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