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A cool alternative for getting into SDR without purchasing a real device is WebSDR, a webapp to tune and listen to SDR devices that some people have connected online, such as this one (beware, autoplays) [1].

Tune in to 4625 kHZ, and there it usually is, UVB-76, buzzing on all of its glory.

[1]: http://websdr.ewi.utwente.nl:8901/

The next step is installing Fldigi, routing the WebSDR browser audio into it and decoding various modulations.

Also, you can find a list of more public web sdrs at http://kiwisdr.com/public/

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