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.
More background information is available here. Questions and comments can be sent to PA3FWM, the author of the WebSDR software and maintainer of this site; but please check the frequently asked questions first.
WebSDR servers can register themselves automatically on this site, leading to the below list of currently active WebSDR servers.
Currently there are 89 servers active, with 483 users and 173546 kHz of radio spectrum.
Liquid-based antennas offer unique advantages over metal ones By Michelle Hampson A new antenna that uses saltwater and plastic instead of metal to sh... Read more
“Since my 6m Delta Loop seems to work pretty well I decided to build one for the 30m band to be used with my Spiderbeam 12m mast. Unfortunately... Read more
“The Legendary G5RV Antenna” is the topic of the new (August 15) episode of the ARRL The Doctor is In podcast. Listen…and learn! Read more