hebel23I got an cheap SDR-RTL USB dongle on ebay for ~ 20 euros.
The dongle contains a Realtek RTL2812 and a Realtek R828D chip, which can receive radio signals between ~30 and 1700MHz.
SDR-RTL Dongle
A project log for Reverse engineering of an unknown 868MHz protocol
Reusing old 868 MHz equipment in openHAB
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