I have been trying to decode P25 signal using RTL2832U and ubuntu 16.04.
I had run the rx.py script from the Op25 rep with the arguments.
The FFT seems to be right.
However I have no audio nor any NAC or tsbks being identified.
Can anyone point out where I am going wrong?
TIA
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Without further information (i.e. stderr.2 logs) it's hard to say for sure what the
problem is. Most likely although your fft plot "looks" good you may not be
accurately tuned. Typically you'll need to adjust ppm (-q parameter) to bring the
tuning into alignment enough that the p25_demod locks on. When that happens you should
see the TSBK counter start to increment.
If you're using the "boatbod" fork you can use the mixer plot (key #5) to
dial in the ppm and fine tuning more accurately than is possible with the fft plot alone.
Furthermore, you can also use a nac value of 0 if you don't know or cannot verify the
nac of the system you are trying to tune.