Spektrum: New RTL-SDR Spectrum Analyzer Software

Recently a reader of RTL-SDR.com, Pavel wrote in to let us know about a new program called “Spektrum” which he has written. Spektrum runs on Windows and Linux and turns an RTL-SDR dongle into a spectrum analyzer in a similar way to rtl_power GUI front ends and RTLSDR Scanner. However one key improvement is that it is based on a version of rtl_power that has been modified by Pavel in order to make it more responsive and remove the need to wait until a full sweep is completed before you can see any results. The modified version of rtl_power can be found at https://github.com/pavels/rtl-sdr.

Spektrum also has an additional “relative mode” feature. This allows Spektrum to be easily used together with a wideband noise source to measure things like filter characteristics and the VSWR of antennas. See our previous tutorial on this here, but note that in our tutorial we used Excel instead of Spektrum to do relative measurements.

The Processing language was used to create Spektrum and Pavel has also released his processing library for accessing rtl_power functionality over at https://github.com/pavels/processing-rtlspektum-lib/releases.

Ready to use releases of Spektrum for Windows and Linux 64-Bit OSes can be downloaded from https://github.com/pavels/spektrum/releases. Note that there may be a bug with the current release which causes only a gray window to show, but we’ve contacted the author about it and it may be fixed soon.

Spektrum: A new spectrum analyzer program for the RTL-SDR
Spektrum: A new spectrum analyzer program for the RTL-SDR


  1. Ken

    Maybe this is a better place to post…

    is there a possibility of a “until manually reset” max hold? this would be a great tool to monitor a portion of spectrum over a period of time.

    a wide-bandwidth waterfall would be useful, at some point, too – just to show a time history of signals…

  2. Michael

    Could somebody build a 32bit Ubuntu version? I can’t seem to get all the files. My testing laptop is 32 bit. I am not taking my new one out in the wild.

    If not build, at least help me build one.


  3. Derek H

    Would love to have something like this for mac. Would love to have something like this on mac and not require a programmer to install.

    • David

      12/2 and still a gray screen for me with various RTL’s plugged in. Using eartoearoak.com/software/rtlsdr-scanner.
      works fine for now.

  4. superkuh

    Guys, if you’re getting a plain gray screen are you sure you’ve plugged in an rtl-sdr dongle ahead of time?

    I get the gray screen but only if I don’t have a dongle plugged in and ready for the software to connect to. If one is plugged in it works great.

    This is so much faster than doing spreadsheet stuff by hand. I can interactively tune antenna and filters now!

  5. Brandon

    Same, grey box on Win 7 x64. If the software doesn’t work, I don’t understand why you’d make a post about it and link to it.

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