Topband: Digital mode spurious issues

[Tom W8JI]

> 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.