On 12/06/2013 11:05 AM, Johnathan Corgan wrote: > On 12/06/2013 10:48 AM, Juha Vierinen wrote: > >> A scope plot of the signal shows something that looks a little bit >> like frequency shift keying. > > Make sure the signal is filtered to the 10K width and attach an FM demod > block to that (just set the sensitivity to 1.0 for now). It definitely > looks like 2- or 4-level FSK.
Due to the drift apparent on the order of seconds, you may only be able to filter down to 20-30KHz. The 'Frequency Xlating FIR Filter' block would let you downconvert from +166 KHz, filter the signal, and decimate down further from 1 Msps to something that would be suitable for input to the FM demod block. If you want, I could let you upload a capture file to gnuradio.org so everyone could join the hunt. -- Johnathan Corgan, Corgan Labs SDR Training and Development Services http://corganlabs.com
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