I will say I am successfully using a signallink. I tried getting digirig going for 2 evenings. I swapped out for the signallink tonight. And it just worked.
Digirig is ver 1.9. Direwolf is a compiled off the dev branch.
Using the digirig. Cable is plugged into the audio port.
I can receive, I can send IFF I press PTT manually.
PTT /dev/ttyUSB0 RTS sounds like a correct choice assuming that USB0 is Digirig’s COM port.
Note that PTT method used by Digirig is different from that used by signalink, that’s why the configuration adjustment if needed if you are swapping between the two.
Those commented out PTT lined are ones I’ve tried.
I followed various articles and looked the udev rules installed by digirig. Seems the hidraw0 is the digirig device. ttyUSB0 is linked to /dev/gps.
There were reports of gpsd messing with Digirig thinking that it found a compatible hardware. This could be the reason you see that the port is associated with gps, while in fact it can still be Digirig’s port. See if these help: