Hello All, 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. ;)
What I have is a toy with a cc1101 chip in it that transmits @ 19.2 k baud, 2-FSK, 16.5 khz deviation. The sync word is the default 0xD3 0x91. Here is a link to the capture file I am working with: https://dl.dropboxusercontent.com/u/37979208/ping_903.020m_0.400m_20140403_000000z_rtlsdr.cfile 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. 73 Jay n8os Jay Radcliffe Twitter: @jradcliffe02 E-Mail: jay.radcli...@gmail.com<https://mail.google.com/mail/?view=cm&fs=1&tf=1&to=jay.radcli...@gmail.com> LinkedIn + Resume: http://www.linkedin.com/in/jradcliffe02
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