Discussion
Assertion (A): Assertion: Image rejection can be improved by narrowing the intermediate frequency filter.
Reason (R): Reason: A narrower filter admits less noise power to the detector.
Select the correct answer from the options below.
Answer: A
The reason is true but the assertion is false: the image arrives at the intermediate frequency itself, so narrowing that filter rejects the wanted signal and the image equally. Image rejection is set before the mixer, by the preselector and by how far out the intermediate frequency places the image. Two true statements about the same component can still fail to explain one another, and this pair is a clean example.
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