Discussion
Why is the stereo subcarrier transmitted with its carrier suppressed?
Answer: D
Suppressing it frees deviation that would otherwise be spent on a component carrying no information, and the small pilot at half the frequency is a far cheaper way to give the receiver its phase reference. Bandwidth is unchanged by carrier suppression, as in any double-sideband scheme. Envelope detection is impossible for a suppressed-carrier signal. And the pilot is placed deliberately above the audio band precisely so it does not interfere. Most errors on this topic come from carrying a result across from a neighbouring scheme where it does not hold.
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