Discussion
Why must the limiter follow rather than precede the intermediate frequency amplifier?
Answer: D
Limiting requires a signal large enough to drive the limiter into its constant-output region, which is why the gain comes first; a weak signal would pass through with its amplitude variation intact. The limiter does not damage anything upstream of it. The amplifier handles constant-amplitude signals perfectly well, as the stages after limiting show. And the discriminator needs a strong, limited input. The ordering follows from the physics of the limiter rather than from convention.
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