KerberosSDR Demo Software Installing the software Install Dependencies via apt: sudo apt update sudo apt install python3-pip python3-pyqt4 build-essential gfortran libatlas3-base libatlas-base-dev python3-dev python3-setuptools libffi6 libffi-dev python3-tk pkg-config libfreetype6-dev php7.2-cli Uninstall any preinstalled numpy packages as we want to install with pip3 to get optimized BLAS. sudo apt remove python3-numpy Install Dependencies via pip3: sudo pip3 install numpy sudo pip3 install matplotlib sudo pip3 install scipy sudo pip3 install cairocffi sudo pip3 install pyapril sudo pip3 install pyargus sudo pip3 install pyqtgraph sudo pip3 install peakutils sudo pip3 install bottle Install RTL-SDR-Kerberos Drivers Our Kerberos RTL-SDR driver branch contains code for slightly modified Osmocom RTL-SDR drivers that enable GPIO, disable dithering, and disable zerocopy buffers which seems to cause trouble on some ARM devices. sudo apt-get install libusb-1.0-0-dev git cmake git clone https://github.com/rtlsdrblog/rtl-sdr-kerberos cd rtl-sdr-kerberos mkdir build cd build cmake ../ -DINSTALL_UDEV_RULES=ON make sudo make install sudo cp ../rtl-sdr.rules /etc/udev/rules.d/ sudo ldconfig echo 'blacklist dvb_usb_rtl28xxu' | sudo tee --append /etc/modprobe.d/blacklist-dvb_usb_rtl28xxu.conf Now reboot the Pi. Test 4x Tuners At this stage we recommend first testing your four tuners with rtl_test. Open four terminal windows, or tabs, and in each window run "rtl_test -d 0", "rtl_test -d 1", "rtl_test -d 2" and "rtl_test -d 3". Ensure that each unit connects and displays no errors. Install KerberosSDR Demo Software First unzip or clone the software git clone https://github.com/rtlsdrblog/kerberossdr sh setup_init.sh Now you can run the software by typing ./run.sh Full software tutorial at www.rtl-sdr.com/ksdr