Re: No PTT in with PowerSDR sr-40
On 7/28/07, philip_g7jur <philip_g7jur@...> wrote:73, Guido.
I am using your latest build of PowerSDR sr40.
The DSR and CTS pins of a Comport do send a dot and a dash, and PPT the Softrock. But they do not function as the PTT in, when the mode is not CW. I would like the PTT on my microphone to put Power SDR into to TX.
I cannot get this to work.
It is true that the dot(dsr) / dash(cts) pins are only intended for CW use. It is maybe a good idea to use the dot input also as PTT in for other modes, however that would require a change in the code.
Not sure if other software like Rocky/Kgksdr uses this principle, but I would like to keep the solution for this consistent with other software.
For a temporary solution, you could use the PTT-in line on the parallel port (pin 12). As mentioned in  it is an inverted input; you could pull-up pin 12 with a resistor ( e.g. 10k) to +5V, while the PTT switch is connecting pin 12 to ground when pressed.
Thanks for your interest in PowerSDR-sr40.