MPT1327 uses MSK on its control channel. I am attempting to use NBFM Receive to demodulate the signal into a WAV file that I can play back and use sdrtrunk to decode it. So far my best attempt is set up as follows:
USRP Sample Rate: 250k Center Freq: 652.625M Gain: 100 Frequency Xlating FIR Filter Decimation: 1 Taps: firdes.low_pass(100,samp_rate,10e3,1e3) Center Frequency: 0 Sample Rate: 250k Rational Resampler Decimation: 250k Interpolation: 192k NBFM Receive Audio Rate: 192k Quadrature Rate 192k Wav File Sink Sample Rate: 192k Bits per Sample: 16 The output of this seems to be just noise and is not working. Thank you. --tyler
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