Discussion
Fidelity in an AM receiver is limited by
Answer: C
The intermediate frequency bandwidth caps the audio bandwidth, since the sidebands must pass to be detected, and narrowing it for selectivity is exactly what dulls the sound. That opposition between selectivity and fidelity is why some receivers offer a switchable bandwidth. Antenna efficiency affects signal strength. Oscillator phase noise is negligible at these bandwidths. And the gain control threshold governs weak-signal behaviour. Every one of the three figures of merit traces back to a filter choice.
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