Discussion
Which component provides adjacent-channel selectivity in an FM receiver?
Answer: A
Ceramic filters at 10.7 MHz give the 200 kHz passband with steep skirts, and several are usually cascaded. The antenna provides broad preselection at best. De-emphasis and audio roll-off act on the recovered audio, long after the channels have been separated or confused. Selectivity is always a filtering job at a fixed frequency, which is the superheterodyne's central economy in FM exactly as in AM.
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