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Gqrx

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Gqrx is an open source software defined radio (SDR) receiver implemented using GNU Radio and the Qt GUI toolkit. Currently it works on Linux and Mac with hardware supported by gr-osmosdr, including Funcube Dongle, RTL-SDR, Airspy, HackRF, BladeRF, RFSpace, USRP and SoapySDR.

Gqrx can operate as an AM/FM/SSB receiver with audio output or as an FFT-only instrument. There are also various hooks for interacting with external applications using network sockets.

Screenshot of the main Gqrx window

Download

Gqrx is distributed as a source code package and binaries for Linux and Mac. Many Linux distributions provide gqrx in their package repositories. Alternate Mac support is available through MacPorts and Homebrew. Windows support is available through radioconda.

Usage

It is strongly recommended to run the volk_profile utility before running gqrx. This will detect and enable processor-specific optimisations and will in many cases give a significant performance boost.

The first time you start gqrx it will open a device configuration dialog. Supported devices that are connected to the computer are discovered automatically and you can select any of them in the drop-down list.

If you don't see your device listed in the drop-down list it could be because:

You can test your device using device specific tools, such as rtl_test, airspy_rx, hackrf_transfer, qthid, etc.

Gqrx supports multiple configurations and sessions if you have several devices or if you want to use the same device under different configurations. You can load a configuration from the GUI or using the -c command line argument. See gqrx --help for a complete list of command line arguments.

Tutorials and howtos are being written and published on the website https://gqrx.dk/

Known problems

See the bug tracker on Github: https://github.com/gqrx-sdr/gqrx/issues

Getting help and reporting bugs

There is a Google group for discussing anything related to Gqrx: https://groups.google.com/g/gqrx This includes getting help with installation and troubleshooting. Please remember to provide detailed description of your problem, your setup, what steps you followed, etc.

Please stick around and help others with their problems. Otherwise, if only developers provide user support there will be no more time for further development.

Installation from source

The source code is hosted on Github: https://github.com/gqrx-sdr/gqrx

To compile gqrx from source you need the following dependencies:

Gqrx can be compiled from within Qt Creator or in a terminal:

For command line builds:

<pre> $ git clone https://github.com/gqrx-sdr/gqrx.git gqrx.git $ cd gqrx.git $ mkdir build $ cd build $ cmake .. $ make </pre>

On some systems, the default cmake release builds are "over-optimized" and perform poorly. In that case try forcing -O2 using

<pre> export CXXFLAGS=-O2 </pre>

before the cmake step.

For Qt Creator builds:

<pre> $ git clone https://github.com/gqrx-sdr/gqrx.git gqrx.git $ cd gqrx.git $ mkdir build Start Qt Creator Open gqrx.git/CMakeLists.txt file At the dialog asking for build location, select gqrx.git/build click continue If asked to choose cmake executable, do so click continue click the run cmake button click done optionally, on the Projects page, under Build Steps/Make/Additional arguments, enter -j4 (replacing 4 with the number of cores in your CPU). Use Qt Creator as before </pre>

Debugging

Debug logging can be enabled by setting the QT_LOGGING_RULES environment variable:

QT_LOGGING_RULES="*.debug=true;plotter.debug=false;qt.*.debug=false" gqrx

To turn on plotter debugging as well, use the following command:

QT_LOGGING_RULES="*.debug=true;qt.*.debug=false" gqrx

Credits and License

Gqrx is designed and written by Alexandru Csete OZ9AEC, and it is licensed under the GNU General Public License.

Some of the source files were adapted from Cutesdr by Moe Weatley and these come with a Simplified BSD license.

The following people and organisations have contributed to gqrx:

Some of the icons are from:

Also thanks to Volker Schroer and Alexey Bazhin for bringing Funcube Dongle Pro+ support to GNU Radio and Gqrx.

Let me know if somebody is missing from the list.

Alex OZ9AEC