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Change fm_demod to unfiltered quadrature demod

Nikos Roussos requested to merge gh-5a3c5b53/50/cshields/quad_demod into gl-5a3c5b53/50/satnogs/dev

Created by: cshields

No filtering or deemphasis from WBFM/NBFM demodulators, just straight up quadrature demod to the wav sink.

Decimation should automatically adjust based on the SDR sample rate, from there the figures are static. Gain may need to be played with a bit, but for now I've been able to successfully decode data from 11 different satellites in the past 24 hours using this script, all the way up to 19k2.

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