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See below from W0EB:
I have not yet done the digging, but if the si5351 is like the
si570 then I believe hardware fsk is quite possible, with no ubitx
hardware changes. Just use the key input for FSK keying. I will
check it out.
On 01/07/2018 06:11 PM, Jim Sheldon
After Ron helped me
get over the "stupids" and I finally learned how to properly
compile & upload stuff to the Raduino, I now have Ron's mods
running and he's fixed a lot of little annoying things (annoying
to me anyway). In between bricking & fixing the rig (all
firmware, no hardware) I managed to make a couple of real nice 20
meter SSB QSO's and also a couple of 40 meter CW QSO's as well
I heard a lot of RTTY (contest this weekend) and sure wish there
were at least 5 more digital pins on the Nano. Then it would
really easy to implement a good CW Keyer and even implement true FSK for RTTY. You'd still need a
computer with sound card running something like Mako Mori's
(JE1HHT) MMTTY program, but that would really work well.
Hardware FSK would be much cleaner to implement than tones into
the SSB section. As wide as the filter is, I'd be wary of the
2nd and maybe even 3rd harmonics of the tones being transmitted
at the same time as the fundamentals. That would really
create havoc on the bands especially during a RTTY contest, not to
mention incur the wrath of the FCC as well.
Jim - W0EB
This little rig just keeps getting better and quite rapidly too!