Below is a guide to the install process, please supply feedback so that it can be improved... First, the testing has been done on the PI 3 "B" with the default install of Raspbian. You'll need to edit the /etc/apt/sources.list file; the file contains the needed "deb-src" line in it, but it's commented out. To fix, edit the file and remove the '#' so the 'deb-src' appears in column one of the file. Save the file, then proceed with the install as follows, first installing the OP25 prerequisites: sudo apt-get update sudo apt-get build-dep gnuradio sudo apt-get install gnuradio gnuradio-dev gr-osmosdr librtlsdr-dev libuhd-dev libhackrf-dev libitpp-dev libpcap-dev git then install OP25 cd ~ git clone https://git.osmocom.org/op25 https://git.osmocom.org/op25 git checkout max cd op25 mkdir build cd build cmake ../ make sudo make install sudo ldconfig The previous generation OP25 application (scope.py) is being deprecated soon; instead we now use the new rx.py. This app is discussed in the README file that's in the OP25 repo that you checked out: op25/gr_op25_repeater/apps/README Max