Discussion
Why does a constant-radius locus imply immunity to amplitude noise after limiting?
Answer: B
If the locus is a circle then the radius carries nothing and can be forced to a constant without losing information, which is precisely what a limiter does - and any noise that perturbed the radius is discarded with it. Noise certainly reaches the receiver; the point is that part of it can be thrown away. Limiting does not add power. And the radius carrying the message would describe amplitude modulation, where limiting would be destructive.
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