The poor mans Flex Radio

Monday, 18 October 2010 15:28 by G7EIX

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.orgA typical WebSDR Waterfall Display

Many WebSDR Nodes are available around the world

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.

You can take a look for yourself at