Opensource Radio Emitter
http://web.flex-radio.com/Products.aspx?topic=sdr1k
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http://silakoff.blogspot.com/2006/12/hand-made-radioactive-monitor.html
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http://www.wireless.org.au/~jhecker/specan
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http://www.volunteerlabrat.com/default.html?goto=fmtrans.html
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http://www.engr.sjsu.edu/rkwok/projects/horn_B.PDF
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http://www.ic-board.de/index.php?cat=c3_Radio-modules.html
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http://www.cappels.org/dproj/Home.htm
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http://chezphil.org/slugbee