Except for the Pico (which is very different from the full RPi), you could do all that with a mini-PC.
There are certainly usecases, especially using the RPi's low-level IO, where that's not possible, but as you yourself have shown, people do often get into situations where they are competitors.
Probably shouldn't have your decoder in the attic anyway, as they aren't well suppressed in terms of EM interference which will seep into the antenna. Particularly a cheap AC-DC wall wart, they're basically broad-spectrum noise-jammers.
I shunt the USB output of the SSR dongles onto Ethernet and pipe that to the PC downstairs.
Huh? It’s ADSB 1090 MHz on a short run of coax to a FlightAware SDR USB dongle. It’s an urban environment so I don’t expect much but I receive plenty of aircraft over 300 nm. Any further away and I would have loss due to inherent limitations of the coax. I could go with like LMR400 but I am not going to spend that kind of money or add like a LNA. This is a setup people commonly use
I'm not the GP, but for my ads-b decoder, it runs on a Pi Zero 2W, which at the time cost under $15 and draws very little power. It's convenient having the computer right next to the antenna to avoid thinking about cables. Runs for a couple days on 100Wh of backup battery.
(I personally find a ton of value out of the Pico and the zero, and less out of the main main, higher powered raspberry Pi line)
I use RPi for little hobby projects
- RPi Pico for being the payload that flies around the world in a PicoBalloon
- Decoding NOAA weather imagery and storing it in my Google Drive
- Full time AIS message decoder and tracker
- Full time ADS-B and MLAT receiver
- Runs my RetroPie setup
- Runs my OctoPrint setup
I wouldn’t replace much of that with an Intel NUC style computer