keyboard - GFSK Demodulation in GNU Radio -

i new gnu radio , sdr world. trying reverse engineer signal logitech wireless keyboard. besides knowledge gained electrical engineering education, have used various guides assist me project ([1],[2],[3]).

i have been able record sample of keyboard , able play computer receiver thinks seeing keyboard, know have signal @ least. demodulating signal having problems. know fcc id research , radio chip uses modulation gfsk, when try sort of demodulation in gnu radio, unable find usable data.

i have been poking around @ problem few months now, , haven't been able solve it. assistance appreciated.

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[1] radio data: http://www.inguardians.com/pubs/grc_signal_analysis_inguardians_v1.pdf

[2] keysweeper: http://samy.pl/keysweeper/

[3] keyfob hack: http://blog.kismetwireless.net/2013/08/playing-with-hackrf-keyfobs.html

i don't know if answer stackoverflow perspective, i'll try nevertheless:

whilst gnu radio has demod gfsk signals, it's hard guess gfsk parameters. might little better off sufficiently oversampling signal, , having @ waterfall visualization of it. can see different fsk subcarriers?

assuming do, appropriately filter signal fsk subcarriers, , compare energy.