Interesting idea with enough design challenges to make it fun. Have you given
any thought to the RX end - decoding the received RTTY?
I would love to see (and use) a system like this. Backpacking with an RTTY
setup would be neat.
--- In digitalradio@yahoogroups.com, "Simon HB9DRV" <simon.br...@...> wrote:
>
> How will you get the shift correct? Doesn't have to be too exact but does
> have to be +/- 25% or so.
>
> I was thinking about this while walking the dog - for a simple solution a
> SoftRock v6.3 would maybe a simpler / better hardware solution but you'll
> need more presky software :)
>
> Simon Brown, HB9DRV
> http://sdr-radio.com
>
> > -----Original Message-----
> > From: digitalradio@yahoogroups.com
> >
> >
> > A simple QRP Tx suitable for beginners, for example, is usually the
> > ubiquitous 1 Watt 40m thing for CW that all the magazines and book
> > seem include ad-ad-naueam, built into sweet tins or whatever novel box
> > they can think of. I want to be different, and publish a design for
> > RTTY. A simple varicap across a crystal, needing a bit of applied
> > science with SSB Rx and Spectrogram prog to set the shift - all part of
> > the basic learning process.
> >
> > But to do that needs a way of driving the Tx with a wire that just
> > waggles 1/0 with RTTY data - just like the mechanical teleprinters of
> > old. So long as it does it at 45 or 50 baud and is properly timed
> > (perhaps not so easy using Windoze - could this be why there's nothing
> > out there?)
> >
> > I wanted to steer away from a design that linearly upconverted from a
> > soundcard then filtered and amplified the result. The request was
> > for "simple designs for beginners"
> >
>
