I put together a VOR navigation receiver in a GNU Radio flowgraph. It was cool driving around the local beacon and having it point the right way as I moved.
I never tested it, I was just happy to get it working.
If I were to do it over, I'd likely want to optimize things quite a bit to get the sensitivity up.
The amazing thing is, though the RTL-SDR dongles are only 8 bit devices, when you're down-sampling 2Mhz of them to audio frequencies, you gain quite a few bits of resolution. I routinely pick up signals below the quantization threshold.
I wonder what the lower bandwidth limit truly is, assuming a stable reference clock.
