OP25j

= Signal Scope =

Installation

Before running the scope app, check that the following packages are also installed: * GNU Radio * The op25 blocks * Frank's gr-fsk4 block * The op25 repeater block

Other than these pre-requisites, no special setup or installation is needed.

There are two overall options depending on your hardware (USRP or disc-tap).

Running with the disc-tap option

The signal scope does not require the USRP. If you have a discriminator-tapped receiver, use the "-a" option: {{{
./scope.py -a -v 25
}}}

Running with the USRP

It's helpful to find out the current calibration error beforehand (I use kalibrate), for example, +1234 hertz: {{{
./scope.py -f 412.34e6 -RA -g 65 -c 1234 -v 25
}}}

In USRP mode, several additional program functions are enabled (spectrum FFT, constellation diagram, PSK demod, and iDEN correlation).