Andy, You said:
> FeldHell or whatever isn't an option. Its not on/off keyed - quite > intentionally - and FSK Hell needs more setting up than RTTY. In it's simplest form Feld Hellschreiber IS on/off keyed! That's the way Rudolf Hell did it back in 1929. I seem to remember a dos program from years ago that simply toggled either a serial port bit (or parallel port bit) and you could use that to drive a simple transmitter. Nowadays as most people don't have either serial or parallel ports on their computer, the sound card is the most accessible port and by constructing a simple threshold detector switch you could achieve the same result. 73 Sholto K7TMG --- In digitalradio@yahoogroups.com, "IMR" <ac.tal...@...> wrote: > > > >In your MMTTY folder (the one that contains the file mmtty.exe), > >is the file extfsk.dll present? > > > > > No. > n fact that file is nowhere to be found on the machine at all :-( > So guess I need to go back to your download page and find it. > > Its all getting too complicated - the design was a request for a simple Tx > for beginners that wasn't yet another CW QRP transmitter - and I was hoping > RTTY would be as dead-simple to get going as it used to be back in the days > of yore. Clearly not. > > It might even be easier to wrirte my own simple RTTY Tx terminal in VB6. > Waggling the TXD line using the "MSComm1.Break = True/False" function will > do the job if timing can be assured. > > And to the others who made comments - > Setting the shift is part of the self education process - I suggested they > use Spectran or SpecLab on thre output on an SSB Rx to set up the shift at > test. Only a case of tweaking a preset R > > FeldHell or whatever isn't an option. Its not on/off keyed - quite > intentionally - and FSK Hell needs more setting up than RTTY. > > Next time a request like that arrives, I'll be boring and just give them an > I/Q upconverter + linear amp. > > Which reminds me - where is all that datmode software that delivers I/Q > stereo outputs. Its only another line or two of code surely. > > Andy > www.g4jnt.com >
