Discussion
Which impairment does the threshold effect describe?
Answer: B
It describes the sudden collapse below a critical carrier-to-noise ratio, which is what makes FM coverage boundaries sharp. Gradual degradation is AM's behaviour. Suppression of a weaker signal is capture. And rising noise with baseband frequency is the triangular spectrum. Four distinct FM phenomena, each with its own name, and using the right name is half of describing a fault correctly.
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