i'm testing a Packet Radio setup on 10489.987.000 . Mode is QPSK 2400bd , SSB . Please feel free to connect. You need:
Soundmodem.exe by UZ7HO, Easyterm.exe by UZ7HO. Google for it. Feed your sdr-console RX-Audio e.g. via Virtual Audio Cable to soundmodem. Watch for my beacon. If you can see it every 3 minutes, good! There are hints in the beacon text for settings that may work.
Feed transmit Audio to your Xmitter. Use a AFSK-input rather than the Mic-input if possible. Set center to 1500.
Edit: Extremely important: Do not overload RX with too high level of audio. Keep waterfall in soundmodem dark. A white Waterfall indicates you are overloading it. Also, set your DCD threshold so your system doesn't reply as long your link partner transmits to avoid collisions.