Discussion
What is a crystal filter used for in a receiver?
Answer: C
Its very high Q gives adjacent-channel selectivity no simple tuned circuit can match, which is why it is fitted at the intermediate frequency where one fixed response serves the whole band. Image rejection is a preselector function at the signal frequency. The detector's direct component is blocked by a capacitor. And crystals do stabilise oscillators, but that is a different application of the same component. Matching component to function rather than to name is the point.
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