The rtl_sdr device is a DVB-T dongle based on the Realtek RTL2832U and can be used as a cheap SDR.
For more information about the airspy please visit http://osmocom.org/projects/sdr/wiki/rtl-sdr.

If you start welle.io without any options welle.io will detect the rtl_sdr device automatically. After enabling the “Expert mode” you can check if welle.io detects the device successfully. welle-io-rtlsdr.png

You can also use the command line option “-D” to force welle.io to use the airspy device.


welle-io.exe -D rtl_sdr


# welle-io -D rtl_sdr

Windows set up

To install the rtl_sdr on you Windows 10 system please follow the steps:

  • Navigate to you welle.io install folder e.g. C:\Program Files (x86)\welle.io
  • Run “zadig_2.2.exe”
  • Choose “Options” and click to “List All Devices” Zadig_List_All.png

  • Select your rtl_sdr e.g. “RTL2838UHIDIR” Zadig_Select_SDR.png

  • Make sure that “WinUSB (…)” is selected and click to “Reinstall Driver” or “Replace Driver” Zadig_Install_Driver.png

  • Now you can check if you device is listed in the device manager Zadig_Device_Manager.png

  • Run welle.io

Linux set up

Just install the library librtlsdr.
For Ubuntu 16.04 LTS you can use the following command

# sudo apt install librtlsdr0