Discussion
Two SSB stations cannot understand one another, and the audio each hears is a garbled inversion.
The most likely cause is
Answer: D
Spectrally inverted, unintelligible audio is the classic signature of opposite sideband selection: the recovered spectrum is mirrored, so low frequencies become high and speech becomes noise. Over-driving distorts but leaves speech recognisable. An equal frequency error on both would cancel rather than garble. And propagation does not invert a spectrum, which is why the sideband convention exists at all. The pattern repeats across the family: what the transmitter sheds, the receiver must supply.
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