South Yorkshire Repeater Group

Happy Valentines day, What’s a web SDR?

For you radio lovers – It stands for Web Software-Defined Radio receiver.

What is so special about this little number is that she is multi-band and multi-user unlike most we’ve seen on the internet. You’ll fall in love instantly with her. We guarantee!!

WebSDR was first conceived as a means to make the 25 m radio telescope at Dwingeloo available to many radio amateurs for EME reception.

In order to test a preliminary version of the software without using the 25m dish, a shortwave WebSDR was set up on Christmas Eve 2007 at the radio club of the University of Twente. After further development, its existence was publicly announced in April 2008.

Interest for the project has been large since then, and many amateurs worldwide have expressed an interest in setting up their own WebSDR server. In November 2008, a beta testing phase has started with a few selected stations.

A WebSDR server consists of a PC running Linux and the WebSDR server software, a fast internet connection (several hundred kbit/s uplink bandwidth per listener), and some radio hardware to feed antenna signals into the PC. This radio hardware is typically a quadrature mixer connected to the PC’s soundcard, like the popular SoftRock kits.

On this page you can listen to and control a short-wave receiver located at the amateur radio club ETGD at the University of Twente. In contrast to other web-controlled receivers, this receiver can be tuned by multiple users simultaneously, thanks to the use of Software-Defined Radio.

Note: you need both Java and JavaScript enabled for this page to work properly. If you don’t hear anything, probably Java is disabled in your browser’s settings, is not installed at all, is a too old version, or is not functioning properly.  The setup is rather experimental, and neither continuous service nor good performance are guaranteed.

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