Discussion
Why does a receiver need both a preselector and an intermediate filter?
Answer: A
They deal with different problems: the preselector rejects the image, two intermediate frequencies away, and the intermediate filter rejects the adjacent channel a few kilohertz away. Neither can do the other's job, which is why both are fitted. Gain comes mostly from the intermediate amplifier. Signal level is managed by the gain control. And audio bandwidth follows from the intermediate filter rather than the preselector. Two filters at two frequencies for two offsets is the architecture in one sentence.
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