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JeeNode user dzach put together an impressive software spectrum analyzer using the transceiver on the JeeNode:
Based on an idea that initiated in the JeeLab forums, a sample sketch and JeeLib, it provides a basic spectrum analyzer with a waterfall display along with normal frequency and time domain displays of the signals, as they are heard by the very same RFM12B module employed in the board.
Read more and get the code at the Jee Labs wiki.
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