Discussion
An operator hears speech on an SSB channel that sounds unnaturally deep and slurred, and adjusting the receiver's fine tuning corrects it.
What was wrong?
Answer: C
A pitch error corrected by fine tuning is a carrier reinsertion frequency error: every component was shifted by the same number of hertz, deepening the voice. Selecting the wrong sideband gives spectrally inverted, entirely unintelligible audio that fine tuning cannot fix. Over-modulation would distort rather than shift pitch. And a saturated gain control would flatten the dynamics without changing the pitch at all. Which of the two economies applies is worth naming before any arithmetic is attempted.
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