Discussion
What effect does an over-coupled intermediate frequency transformer pair have?
Answer: A
Over-coupling produces two peaks with a dip between them, which broadens the passband at the cost of a flat top. It is deliberately used where a wider response is wanted, as in FM sets. Critical coupling gives the flattest single peak, and under-coupling a narrower and lower one. There is no loss of gain at centre and no level-dependent shift. Coupling is a design parameter with a continuum of useful settings rather than a single correct value.
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