WSPR has continually been one of my favorite modes. While I enjoy the magic of a random CQ contact, I also enjoy getting a snapshot all around the world of who is receiving my signal sent from various antennas/locations/power levels/etc. I was using it so much though, I needed to find a way to free up my HF rig for other experiments 😉 Devices like the U3S from QRP Labs, & the WSPRlite from SOTABeams are neat gadgets, but if you already have a Raspberry Pi in the shack, you might want to consider the QRPi from TAPR.
What’s the QRPi you say? Well it’s a 20m transmit shield for the Raspberry Pi that does more than just WSPR – but CW, SSTV and many more – just checkout the documentation here. (Designed by HA7DCD). I think it has been quite popular as of late though, because as of today, they are sold out.
All that’s required is to open up the terminal command window – and type in some simple commands to get up and running with this board. Installation of a simple SO-239 pigtail to the board was easy enough. The only consideration I would take in running the RPi is to ensure your not using a dirty power supply – which they are consistently supplied with! The typical wall warts that come with RPi’s usually aren’t clean enough, so I’ll usually power it from my Alinco PS USB port.
Propagation has been absolutely tough this week – but still impressive for 100mW. I’m hooked up to my 4 band off-center fed at the home QTH for this test, with about a 75′ run of coax. Average distance for the past day has been about 2800km.
RPi’s are increasingly becoming more popular in the shack as they gain a bit of processing power. I also use the RPi as my APRS I-Gate. Lots of uses for an RPi in the shack – what do you use yours for?