2017-03-26 Going full duplex with amateur satellites, part 2 : Installing Gqrx SDR software and the first tests 8 months ago
With the hardware available it's now time to test the first part of the software setup: whether I can have running software defined radio. To (re)install Gqrx I followed the instructions at Install Gqrx SDR on Ubuntu Linux. The first 'sudo apt-get purge --auto-remove' steps removed a lot of software and the latter 'sudo apt-get install' steps added newer (or maybe the same) versions. But I was glad to do a full reinstall, I have had weird problems with gqrx versions before. The laptop on which I am doing this has had an install of gqrx before, but was upgraded from Ubuntu 14.04 LTS to Ubuntu 16.04 LTS in the mean time, so a clean reinstall seemed a good idea. I plugged in the RTL-SDR stick and checked whether no drivers were installed, which was indeed still correct. The kernel messages:[156490.915435] usb 2-2: new high-speed USB device number 7 using xhci_hcd [156491.111136] usb 2-2: New USB device found, idVendor=0bda, idProduct=2838 [156491.111141] usb 2-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [156491.111143] usb 2-2: Product: RTL2838UHIDIR [156491.111145] usb 2-2: Manufacturer: Realtek [156491.111147] usb 2-2: SerialNumber: 00000001To make sure the drivers aren't loaded, I have a /etc/modprobe.d/local-blacklist.conf with:blacklist dvb_usb_rtl28xxu blacklist rtl2830 blacklist rtl2832 blacklist lirc_devTo test it with the 'minimal' setup I started with just the RTL-SDR and a simple antenna, and Gqrx. Enabled remote control in Gqrx and added a radio 'gqrx-sdr' in Gpredict with host 'localhost' and port '7356' (default for gqrx remote control) and Radio type 'RX only', PTT status 'none'.