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Introduction to using the KiwiSDR

The KiwiSDR is a software-defined radio that attaches to a Seeed BeagleBone Green (BBG) embedded computer. It is available as the board alone or a more complete version including BBG, GPS antenna and enclosure with the software pre-installed on the BBG.

The Kiwi is different from other SDRs. It is a standalone device that attaches to your local network and is optionally accessed through the Internet. A browser is used to connect to the user interface. Most other SDRs generate raw IQ data and need to be connected directly to a PC or laptop running OS-specific, installed software.

Browsers supported include Firefox, Chrome, Safari and Opera on Windows, Linux and Mac. A version of the interface for mobile devices is under development. Until then the browser interface will work on iPad and Android devices with a large enough display. The Kiwi supports up to four simultaneous connections each with their own independently controlled audio and waterfall channels. An extension interface allows advanced signal decoding directly in the browser interface without installing additional software. The most popular is the integrated WSPR decoder. The Kiwi also includes a software-defined GPS receiver used to calibrate the SDR frequency and time-of-day.

You can access over one hundred KiwiSDRs right now at the site The owners of these Kiwis have made them publicly available. We hope you will join them, especially if you live in an interesting part of the world where a Kiwi is not yet located (see map).


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Welcome to, your online remote base community.

Enjoy operating remote amateur transceivers & more by joining our community today! Don't miss rare DX you may never have a chance to hear. Test your own signal propagation, are you being heard in a DX location? Multiple operator support allows for new methods of contesting, nets, round tables, etc. between RF and REMOTE operators.

Below is a guide to get you operating as quickly as possible using RCForb Client software. It's as simple as 1-2-3!


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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.

Since April 2018, the Chrome browser is reluctant to play audio on WebSDR sites. If you use Chrome and have no audio on WebSDR sites, a workaround is to switch off Chrome's new autoplay policy, by typing chrome://flags/#autoplay-policy in the navigation bar and changing this setting from Default to No user gesture is required (and restarting the browser).
Currently there are 175 servers active, with 768 users and 702 MHz of radio spectrum.