VERON Amateur radio club ETGD
PI4THT		 Faculty for Electrical Engineering, Mathematics and Computer Science UT
Wide-band WebSDR

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.

This site, which in 2008 was the very first WebSDR site ever, was finally reactivated in July 2012 after an interruption of more than 1.5 years; read also the old news since then.


The system is currently composed of a "Mini-Whip" antenna, a homebuilt SDR board (pictured above; see here for background) which samples the entire shortwave spectrum and sends all of this via a gigabit ethernet link to a PC, where a special version of the WebSDR server software processes it. The Mini-Whip is based on a design from PA0RDT (google finds it); see some pictures. The active receiving element is about 5 by 10 cm large. Such an antenna only works well with a good grounding; ours is on top of a 20m high building, the upper part of which is all metal.
This is an experimental version of the WebSDR page which does not need Java.
It uses some very new features from HTML5, which are not yet available on all browsers.
Update April 1: added support for audio on Firefox.
Therefore it should now work fully with the latest versions of Chrome, Safari (also on iPad and iPhone, thanks to help from KF6VO), and Firefox (and possibly also the Firefox version for Android).
Comments are welcome (pa3fwm@websdr.org).
You can select whether you want to use Java or HTML5 using the controls:
This button should produce the letter R in morse code (.-.).

View:

Frequency: kHz

Or tune by clicking/dragging/scrollwheel on the frequency scale.
Memories:
Waterfall view:
Or zoom with scroll wheel on waterfall.
Move by dragging the waterfall with the mouse.
Bandwidth:
? kHz @ -6dB; ? kHz @ -60dB.
Or drag the passband edges on the frequency scale.
Waterfall settings:
Speed:
slow
medium
fast 		Size:
small
medium
large 		View:
spectrum
waterfall
weak sigs
strong sigs


[scale]
? dBm; peak ? dBm;
squelch autonotch
Logbook:
Call of station that you hear:
Comments, if any:
Note: time, frequency, your name/call, and DXCC information are added automatically.
View the last 20 lines of the logbook, or the entire logbook (ctrl-click for new tab/window).
Station information:
Lookup in databases:

This WebSDR is currently being used by ? user(s) simultaneously:      compact view

Chatbox:
This chatbox is intended to discuss the operation of the WebSDR. Please keep the discussion civil and polite; that also means no swearing ("four-letter words").
The operators of this site disclaim any responsibility for text appearing in this chatbox. 

















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