*** SP2DNI * LOC: JO94IE * QTH: PSZCZOLKI * POLAND*** VY 73 ***

Web SDR

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 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.
When these beta tests are successful, the software will be made available publicly
on this site.


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.


Questions and comments can be sent to PA3FWM,
the author of the WebSDR software and maintainer of this site.


A list of currently active WebSDR servers is on http://www.websdr.org/.

Web SDR from Weert, The Netherland

Web SDR at OE4XLC

Web SDR in USA W4MQ

Web SDR from Austria by OE4RLC, OE3DUS

Web SDR in Louisiana USA

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