Discussion
Which sideband is conventionally used on the amateur bands above ten megahertz?
Answer: C
Convention puts upper sideband above ten megahertz and lower sideband below it, a purely arbitrary agreement that nonetheless matters: two stations on opposite sidebands cannot understand one another at all, since the recovered audio is spectrally inverted. Choosing at random would make contacts impossible. And alternating would be worse still. The convention is a good example of an interoperability rule with no technical basis beyond the need for agreement.
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