Discussion
Which measurement would confirm that a transmitter is over-modulating?
Answer: B
The flattened trough on an envelope display is the direct evidence: the envelope has hit zero and folded, which is exactly what over-modulation means. Antenna current does rise with modulation depth, but a rise alone cannot distinguish deep legal modulation from illegal over-modulation. Carrier frequency is unaffected. And a falling audio input would reduce the depth rather than reveal an excess of it. Confirming the fault on the waveform rather than inferring it from a meter is what makes the envelope display indispensable.
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