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[Discuss-gnuradio] Demodulating a MPT1327 signal

From: Weaver, Tyler [GCS]
Subject: [Discuss-gnuradio] Demodulating a MPT1327 signal
Date: Wed, 6 Aug 2014 19:31:21 +0000

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:



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.



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