Discussion
Where does a transmitter's harmonic filter sit?
Answer: B
It sits after the output stage, on the way to the antenna, because that is where the harmonics are generated and the only place they can be stopped before radiation. Filtering earlier would achieve nothing, since the class C output stage creates its own. The audio chain works far below the carrier. And supply filtering deals with ripple rather than radio-frequency harmonics. Placing each filter where its unwanted content arises is the general rule.
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