Peter Onion recently attended the Chelmsford Amateur Radio Society Skills Night and showed off his Raspberry Pi Panadapter. I’ve seen it in person at Potton Pi and Pints and I have to say it’s brilliant. You set the equipment up and then you can see a graphical representation of the radio signals on the Pi’s screen. You can then identify which frequencies have stuff going on and tune accordingly. Here’s a video of it in action: