Home › Forums › temp › 15.219 and 15.239 do not specify the modulation scheme to use › You could amplitude and
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You could amplitude and frequency modulate the same signal, simple VFO transmitters do, like the old phono oscillators. Thinking about it, if the signal is strong enough at the receiver, and you don’t modulate the AM part fully, the FM signal should work well, but probably not the AM.
We were talking about AM stereo, that uses phase modulation of the station’s carrier for the L-R difference signal, so that’s a sort of AM-FM signal it would seem.