You can get a cheap Chinese radio and run OpenGD77 [1] on it. Not exactly Raspberry Pi with RTL-SDR, but still open source. [1] https://github.com/rogerclarkme

You can get a cheap Chinese radio and run OpenGD77 [1] on it. Not exactly Raspberry Pi with RTL-SDR, but still open source. [1] https://github.com/rogerclarkmelbourne/OpenGD77 https://github.com/rogerclarkmelbourne/OpenGD77