And hamcom modem is cheap Just an opamp powerd from the rs232 .. Used as komparator
So you need no soundcard ... What about using an si570 for the vfo? And there is a lcd circuit for controlling the si570 . That would give a nice cw psk rtty trx Dg9bfc Sigi _____ Von: digitalradio@yahoogroups.com [mailto:digitalra...@yahoogroups.com] Im Auftrag von Siegfried Jackstien Gesendet: Dienstag, 3. August 2010 16:36 An: digitalradio@yahoogroups.com Betreff: AW: [digitalradio] Re: Direct RTTY Generation I know that the old hamcom software does this . In rtty and cw mode is sends the data 1:1 out on a serial pin on the rs 232 . I know this exactly as I made a mod in my hamcom modem. In rx the transistor is always set to high so I had to connect the ptt transistor and the fsk transistor in series (connector of one going to emitter of the other . I cutted the ground connection of the fsk transistor and connected that to the collector of the ptt transistor So with that soft you surely can do this The soft runs well in a dosbox (as I know) You wanna go cheap? Take an old laptop with win98 on it A slow one will work okay with it and on the older ones you will have a better chance to find a rs 232 Greetz Dg9bfc On this 2 pages you will find lots of hamsoft for digi modes (also older ones) http://www.xs4all. <http://www.xs4all.nl/~nl9222/software.htm> nl/~nl9222/software.htm http://www.xs4all. <http://www.xs4all.nl/~nl9222/digisoft.htm> nl/~nl9222/digisoft.htm _____ Von: digitalradio@yahoogroups.com [mailto:digitalra...@yahoogroups.com] Im Auftrag von IMR Gesendet: Dienstag, 3. August 2010 13:34 An: digitalradio@yahoogroups.com Betreff: [digitalradio] Re: Direct RTTY Generation 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" Andy --- In digitalradio@ <mailto:digitalradio%40yahoogroups.com> yahoogroups.com, "Simon HB9DRV" <simon.br...@...> wrote: > > Andy, > > > > Can you be more specific about the design requirements? > > > > Simon Brown, HB9DRV > > http://sdr-radio. <http://sdr-radio.com> com > > > > From: digitalradio@ <mailto:digitalradio%40yahoogroups.com> yahoogroups.com [mailto:digitalradio@ <mailto:digitalradio%40yahoogroups.com> yahoogroups.com] On > Behalf Of AC TALBOT >
