Discussion
Which property makes both angle modulations efficient in the transmitter?
Answer: D
A constant envelope permits the output device to run saturated, so class C or switching amplifiers can be used and efficiency is high. The carrier is present in both schemes. Their bandwidths are wide rather than narrow. And a small index is a special case rather than a general property. This is the one advantage the angle family holds over single sideband, which is the most power-efficient amplitude scheme but insists on linear amplification.
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