Nothing stays the same. This is the case for my Remote Station which has now morphed into a remote receive only HF & VHF iGate. After acquiring an SDRPlay RSP 1, I have now removed the IC-7300 and replaced it with the RSP 1. So now the remote consists of the NUC, the preexisting RTL-SDR and the SDRPlay RSP 1. This allows me to run APRS iGates on 30m and 40m using the RSP 1, and 2m terrestrial (145.175Mhz) and 2m satellite (145.825Mhz) using the RTL-SDR.
Dealing with audio from the two devices created some challenges, however these were overcome as the DireWolf APRS software can accept UDP connections. I am using SDRuno for the HF side, running two virtual receivers, piping the audio via a virtual audio cable using the left and right channels for the 30m and 40m audio, respectively. I am using the SDR++ software for the RTL-SDR, as this allows for UDP audio streams. This software can also run multiple virtual receivers (to separate UDP ports). Problem solved!
The DireWolf software is a very remarkable piece of software, which just seems to work without fail for years at a time. I have used it mainly on a Raspberry Pi running Linux for probably over a decade. It seems just as stable on Windows 10. Given that APRS on HF is using SSB DireWolf has the ability to setup multiple receiver pairs with filtering. This can be seen in the screenshot below.
It seems that the processes can only handle so much as I needed to reduce the number of receive pairs on the 40m side. Nonetheless, this is still impressive.
The 2m side is working well, having received signals from both land and satellite sources. And the HF side works on the test-bench. One thing that is still required is the setting of audio and receiver gain levels, however I think I am getting close.
That's it for now.
Cheers
Links
- https://www.sdrplay.com/
- https://www.sdrpp.org/
- https://github.com/wb2osz/direwolf
- https://vb-audio.com/Cable/
