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http://www.wm7d.net/fcc_uls
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http://www.ic-board.de/index.php?cat=c3_Radio-modules.html
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http://shop.ciseco.co.uk/xrf-wireless...ata-module-xbee-shape-arduino-pic-etc
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http://hackaday.com/2011/07/19/jeri-ellsworth-builds-a-software-radio
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http://lists.contesting.com/archives/html/WriteLog/2005-10/msg00137.html