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What is WebSDR?
A WebSDR is a Software-Defined Radio receiver connected to the internet, allowing many listeners to listen and tune it simultaneously. SDR technology makes it possible that all listeners tune independently, and thus listen to different signals; this is in contrast to the many classical receivers that are already available via the internet. WebSDR.org was created by PA3FWM, Pieter-Tjerk de Boer, at the University of Twente, Enschede, Netherlands. From his website, 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. By now, the software is made available to anyone serious about setting up a server; see the FAQ for information on this.
A WebSDR server consists of a PC running Linux and the WebSDR server software, a fast internet connection (about a 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, and the RTL-SDR that I run on this site. It's very good!
Here are some selected YouTube Videos I recommend that you watch on WebSDR.
This was a challenge to get running on the Raspberry Pi 4 but with persistance and little help from two hams, N4BUT and KA6NEW, I was able to get it running. My WebSDR is running on 2 RTL-SDR dongles and my NooElec Ham-It-Up converter to serve 40 meters and homemade upconverter for 80 meters. And with a some help from N4BUT and some HTML coding, I was able to come up with the following webpage by following the instructions:
Want to listen to my RTL-SDR right now? Click the image above to give it a try.
NOTE: If the radio sounds like it is not receiving anything, it is highly likely I turned the antenna off so I can use the antenna when I'm using my Kenwood TS-570D or Flex-3000 to work DX or for domestic QSO's. Check back at a later time to use the tuner.
Hopefully, you clicked on the image above and listened to my RTL-SDR. But there are so many other SDR's available from WebSDR.org. At last counter, there were 190 available SDR's as of December 22, 2020!
WebSDR OpenWebRX HDSDR SDR Space SDR# GQRX Quisk RemoteHams Global Tuners
CQ CQ CQ
If you have a question or a comment. please do not hesitate to ask here.