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Technically, no, FT8 is not an SSB signal. it is not amplitude modulated and in this context the "carrier" is nothing more than another heterodyne mix local oscillator of which there can be several in a typical (non-SDR) transceiver.
On Sat, 22 Feb 2020 02:44:49 -0600
"Seannon Baker (AG0NY)" <KD4IYI@...> wrote:
Also, the rules regarding the center frequencies are not clear. (they are)