Hi folks!

I don't no if this is the right way to request help regarding op25.

Let me try :).

I am trying  Op25 decoder (scope.py) + USRP. Although I can get the air interface signal, the error rate is too high and the voice signal is rarely intelligible.

The radio I have is setup in direct mode in 800MHz (a bit higher than the ones I saw in previous work).

Using the signal analyzer app (osmocom_fft.py) I can detect the signal with a high power level using the same antennae and gain settings.

I have already run the scope.py (osmocom) and got the audio and radio info. It seems that the scope.py+USRP request a high frequency offset (7.5kHz) to tune the carrier and try to decode the air interface signals.