• user settings
  • calibrated signal meter
  • rewritten spectral scanning
  • antenna pattern plotting
  • frequency presets
  • sound volume control
  • antenna switching
  • network connection
  • improved look (Windows)
  • new GTK+ libraries (Windows)
  • rewritten serial port handling (Windows)
  • other bug-fixes / improvements

patternUpload the latest XDR-I2C using Arduino IDE to your Seeeduino board. Antenna input alignment function is now splitted into a separate file (align.ino), so don’t forget to update it with your own values.

The network connection requires a dedicated server. I’m working on a Linux version, but stable version isn’t available at the moment.

Antenna switching is one of the features requested by users. An external RF switch is required. I haven’t build it myself, but Petr Vozár (4 antennas) and Mike Fallon (2 antennas) are using it. Check Modified tuners page for more info.

The antenna plotting function requires a rotator (full 360°). For best measurements an signal attentuator between XDR and antenna may be necessary.

Many thanks to Przemysław Korpas (SQ7JHV) from Warsaw University of Technology for help with signal meter calibration using a professional signal generator. I compared two XDRs and they seem to give very close results. Maximum signal strength reported by XDR is around -35dBm /75Ω/ (‚old’ 102dB value). For best results set AGC threshold to highest, turn off RF and IF +6dB gain and make sure that antenna input is properly aligned. For measuring local stations with very high signals consider using an attentuator.


For more info, source code and download see: XDR-GTK

  1. Oskar Rand 25-08-2017 22:22

    My name is Eva Lotta, DXing in Estonia,Viimsi

  2. Klaas Spoelstra 29-07-2019 19:43

    Hi there,

    Can I ask someting in this forum? Is the following combination possible?
    Grove I2C FM receiver v1.1 (RDA5807M) + Seeeduino, using XDR-GTK
    FMdxKlaas, HOL

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