How is this different than RTTY using the AFSK method? In my FT-1000D, if you try to use FSK mode for RTTY it turns out that the rig is still running AFSK, using an internal audio source.
I've never looked at the FT1000, but I doubt that is a clean system. It would still be like a SSB transmitter with audio signals if that is how they do it. It would be much better to actually shift a carrier, and not do the baseband audio signal run though a balanced modulator and then through a sideband filter.
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