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
