I am working on learning gnuradio and getting a grip on demodulating digital communications. I've been a ham for a long time, and this seems far from my days as a kid running 1200 baud half duplex AFSK. ;)
I started out by trying to get Jared Boone's TPMS code to work, https://github.com/jboone/tpms
but it doesn't like me or my system at all. (Ubuntu 12.04, gnuradio built with the build-gnuradio script). I really like his reverse engineering methods that he talked about in the talk he gave at toorcon. I also like the ability to analyse the captures offline with a CLI interface.
When I have worked with the GRC, I run the file source through a throttle, then through the quadrature demod block, then to a Scope Sink to try and see the bits on the scope. I am a little lost on a couple things: 1. I know i need to provide some information about the signal (data rate, deviation, offset) but I don't see any place to add those values. 2. Can I use the squelch block to limit the demodulation to only look at signals above a certain signal strength?
Ideally, I would love to get a GRC or script that worked on the capture file, then I can have a good example to learn from. Most of the posts I see from googleing show really incomplete work, or just the final product, without explanation of how to get there (the dreaded "self-documenting code").
Any help would be greatly appreciated. beer is on me if I see you at a conference or swap.