Discussion
What bounds the FM noise advantage at low signal levels?
Answer: C
Below threshold the output collapses and the improvement vanishes abruptly, so the figure of merit applies only above it. That is why FM coverage boundaries are sharp where AM's fade gradually. Capture concerns two signals rather than one weak one. The pre-emphasis constant shapes the audio. And channel spacing is an allocation. Every gain has a condition attached, and for FM the condition is adequate carrier-to-noise ratio at the detector.
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