Gqrx

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gqrx "is an open source software defined radio receiver (SDR) powered by the GNU Radio and the Qt graphical toolkit." It supports multiple SDR hardware devices, including (but not limited to) the RTL-SDR, HackRF, and Airspy. A complete list of supported hardware can be found at https://gqrx.dk/supported-hardware.

Notable features include AM, SSB, CW, and (wide) FM demodulation, spectrum plots and waterfalls, and the ability to record and stream audio output. A more complete list of features can be found on the gqrx website: https://gqrx.dk/

Installation

Kernel

If using an RTL-SDR, you will need to configure your kernel to blacklist the rtl2832 module, as the normal DVB-T driver is not compatible for its use as an SDR. More information regarding this can be found on the RTL-SDR wiki page.

USE flags

USE flags for gqrx itself are as follows:

USE flags for net-wireless/gqrx Software defined radio receiver powered by GNU Radio and Qt

gr-audio Use audio support from net-wireless/gnuradio
portaudio Add support for the crossplatform portaudio audio API
pulseaudio Add support for PulseAudio sound server

It is important to specify the correct USE flags for the net-wireless/gr-osmosdr dependency, or else gqrx will not find your SDR device:

USE flags for net-wireless/gr-osmosdr GNU Radio source block for OsmoSDR and rtlsdr and hackrf

airspy Build with Airspy support
bladerf Build with Nuand BladeRF support
hackrf Build with Great Scott Gadgets HackRF support
iqbalance Enable support for I/Q balancing using gr-iqbal
python Add optional support/bindings for the Python language
rtlsdr Build with Realtek RTL2832U (rtlsdr) support
sdrplay Enable support for SDRplay devices through net-wireless/sdrplay
soapy Build with SoapySDR support
uhd Build with Ettus Research USRP Hardware Driver support

For example, if one has an RTL-SDR, the following can be used:

FILE /etc/portage/package.useSetting USE variable for the RTL-SDR
net-wireless/gr-osmosdr rtlsdr

Emerge

root #emerge --ask net-wireless/gqrx

Configuration

Files

  • ~/.config/gqrx/default.conf - User configuration file for the configured SDR device.


The above file will be created on first launch when selecting the SDR device and associated options. If the supplied config results in an error, gqrx will detect this and let the user re-specify their config on the next launch.

Usage

Invocation

Start gqrx's graphical interface as follows:

user $gqrx

Additional options can be seen with -h/--help:

user $gqrx --help
Controlport disabled
Gqrx software defined radio receiver 2.12
Command line options:
  -h [ --help ]         This help message
  -s [ --style ] arg    Use the give style (fusion, windows)
  -l [ --list ]         List existing configurations
  -c [ --conf ] arg     Start with this config file
  -e [ --edit ]         Edit the config file before using it
  -r [ --reset ]        Reset configuration file

Troubleshooting

SDR device not listed

If the SDR device you are trying to use is not listed, then it is possible that net-wireless/gr-osmosdr was not compiled with the correct USE flag(s). Launch gqrx from the command line and look for the following line:

user $gqrx
...
built-in source types: ...
...

For reference, a build of gr-osmosdr with support for most SDR devices will look like this:

user $gqrx

... built-in source types: file osmosdr fcd rtl rtl_tcp plutosdr miri hackrf bladerf rfspace airspy airspyhf soapy redpitaya ...

Check the USE flags that are set for the net-wireless/gr-osmosdr package to ensure the correct one(s) are set for your devices.

Removal

Unmerge

root #emerge --ask --depclean --verbose net-wireless/gqrx

External resources