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Because they want hetorodynes to show that two signals were transmitted at once.
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Indeed, having flown in (and driven the thing too, great fun, "take control I need to make a 'phone call") the bosses helicopter there is the occasional on channel signal, the usual reply is "I have been stomped on, please repeat" with a hetorodyne as said before, it is also simplex for the same reason.
The data rate does go down but the parity check is supurb.