[Elecraft] RTTY Operations

[John-Morrow]

 As the K2 isn't capable of FSK, I didn't think
> that anyone would be using an outboard TU with it, but I didn't
realise
> Julian, G4ILO. (RSGB, ARRL, G-QRP, K2 3#92)

The main reason for using  the tones 2215/2295Hz as afsk was that
hopefully the harmonics generated in the audio stages
of the tx would fall outside the ssb filter bandwidth.  The
profliferation of cheap/free
soundcard software has been great at
popularising rtty but some of the sigs on
the bands leave a lot to be disired where
some do not realise that afsk can generate
more signals  than they think!
The most desirable way to generate rtty is
by FSK.
It should be possible to FSK the bfo of the K2.
It would require a fimware change to give Rx/Tx
tone shift similar to CW but with a tone greater
than the 800Hz available at present. Perhaps
the whole thing could be done in firmware.

I use an external TU tuned to 1275/1445 only as tuning indicating to
feed a scope with 'flipping
bananas'  but the decoding is done in software. This is the most
accurate method for tuning rtty.
Hence my requirement for a wide BFO range.

73 es  gl
John Morrow GI4KSH