Discussion
Which characteristic of the discriminator sets the recovered audio's linearity?
Answer: B
Distortion follows any curvature in the frequency-to-voltage characteristic, so its straightness across the deviation range is what matters. Filter Q sets selectivity. Audio bandwidth sets the reproduced range. And limiter gain determines only whether limiting is complete. This is why the phase-locked loop displaced the discriminator family: its linearity comes from the loop rather than from the shape of a tuned circuit's response.
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