Discussion
Selectivity in a broadcast AM receiver is set mainly by
Answer: C
The intermediate frequency filter does the work, operating at one fixed frequency where a sharp response can be built and used across the whole tuning range. The antenna circuit contributes broad preselection and image rejection. Tone controls shape audio and cannot separate channels. And the gain control's time constant governs how quickly the receiver adapts to level changes. Concentrating selectivity at a fixed frequency is the superheterodyne's central economy.
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