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Spectrum analyzer for multiple SDR platforms (PyQtGraph based GUI for soapy_power, hackrf_sweep, rtl_power, rx_power and other backends)




Default backend

soapy_power is the default and recommended universal SDR backend in QSpectrumAnalyzer. It is based on SoapySDR and supports nearly all SDR platforms (RTL-SDR, HackRF, Airspy, SDRplay, LimeSDR, bladeRF, USRP and some other SDR devices). It is highly configurable (see additional parameters help in Settings menu) and supports short acquisition time for near real-time continuous measurement.

Other backends

hackrf_sweep backend enables wideband spectrum monitoring by rapidly retuning the radio without requiring individual tuning requests from the host computer. This allows unprecedented sweep rate of 8 GHz per second. Only HackRF is supported.

rtl_power_fftw is alternative backend for RTL-SDR devices and has various benefits over rtl_power. E.g. better FFT performance (thanks to use of fftw library) and possibility to use short acquisition time for near real-time continuous measurement (minimum interval in original rtl_power is 1 second).

rtl_power is original backend for RTL-SDR devices. There are better alternatives now, but if you want to use it, you should use Keenerds fork of rtl-sdr (latest Git revision), because rtl_power in original rtl-sdr package (from is broken (especially when used with cropping).

rx_power (part of rx_tools) is also based on SoapySDR (like default soapy_power backend) and therefore supports nearly all SDR platforms. But it is much slower than soapy_power, doesn't support near real-time continuous measurement (minimum interval is 1 second, same as rtl_power) and is buggy. Backend is currently unsupported, if you want to fix it, patches are welcome.


Start QSpectrumAnalyzer by running qspectrumanalyzer.

You can choose which backend you want to use in File -> Settings (or Application menu -> Preferences on Mac OS X), default is soapy_power. Device, sample rate, bandwidth, LNB LO, path to backend executable and additional backend parameters can be also manually specified there. You can also set waterfall plot history size. Default is 100 lines, be aware that really large sweeps (with a lot of bins) would require a lot of system memory, so don't make this number too big.

Controls should be intuitive, but if you want consistent results, you should turn off automatic gain control (set gain to some fixed number) and also set crop to 20% or more. For finding out ppm correction factor for your rtl-sdr stick, use kalibrate-rtl.

You can move and zoom plot with mouse, change plot settings or export plots from right-click menu. Waterfall plot black/white levels and color lookup table can be changed in mini-histogram widget (on Levels tab).


Arch Linux:

Stable version:

git clone
cd qspectrumanalyzer
makepkg -sri

Git master branch:

git clone
cd qspectrumanalyzer-git
makepkg -sri

Or simply use pacaur (or any other AUR helper) which will also automatically install all QSpectrumAnalyzer dependencies:

pacaur -S qspectrumanalyzer
pacaur -S qspectrumanalyzer-git


# Add SoapySDR PPA to your system
sudo add-apt-repository -y ppa:myriadrf/drivers

# Update list of packages
sudo apt-get update

# Install basic dependencies
sudo apt-get install python3-pip python3-pyqt5 python3-numpy python3-scipy soapysdr python3-soapysdr

# Install SoapySDR drivers for your hardware (e.g. RTL-SDR, Airspy, HackRF, LimeSDR, etc.)
sudo apt-get install soapysdr-module-rtlsdr soapysdr-module-airspy soapysdr-module-hackrf soapysdr-module-lms7

# Install QSpectrumAnalyzer locally for your current user
pip3 install --user qspectrumanalyzer

qspectrumanalyzer and soapy_power executables will be then placed in ~/.local/bin directory, you can add it to your PATH in ~/.bashrc.

If you want to install QSpectrumAnalyzer directly from Git master branch, you can use this procedure:

git clone
cd qspectrumanalyzer
pip3 install --user .


Only 64-bit Windows are supported (there are no public 32-bit builds of SoapySDR libraries and drivers).

  1. install SoapySDR libraries and drivers (bundled as part of Pothos SDR installer: download). This bundle also includes other great SDR apps like CubicSDR, GQRX, GNU Radio Companion, Pothos GUI, Lime Suite and Zadig. Utilities like hackrf_sweep and rtl_power are also included.
  2. download QSpectrumAnalyzer installer or portable zip archive from GitHub releases page
  3. after you connect your SDR device, you have to run Zadig to install USB drivers

You can also install QSpectrumAnalyzer manually from PyPI:

  1. install Python 3.6.x (64-bit) from and add Python to PATH

  2. install SoapySDR libraries and drivers (bundled as part of Pothos SDR installer: download)

  3. Open cmd.exe and run:

    pip install PyQt5
    pip install QSpectrumAnalyzer

You should then be able to run it with qspectrumanalyzer (or python -m qspectrumanalyzer if it doesn't work for you).


  • save FFT history (allow big waterfall plot saved to file)
  • automatic peak detection / highlighting
  • display average noise level
  • frequency markers / bookmarks with notes (even importing and exporting .csv file with predefined channels, etc.)