Discussion
An FM receiver's limiter is fitted to
Answer: C
Because the information is in the frequency, amplitude variation can be removed entirely, and with it most of the additive noise. That is the single largest reason FM outperforms AM on a noisy channel. It does not restrict deviation, which is set at the transmitter. Discriminator saturation is not the concern; unlimited amplitude variation would appear as noise at the output. And audio level is handled after detection. The limiter is what makes the constant-envelope property pay.
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