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Software Defined Radio

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What is a Software Defined Radio? 

GNU Radio - The GNU Software RadioGNU Radio Hardware, Universal Software Radio Peripheral (USRP) 

GnuRadioWiki,

Software Radio - Cognitive Radio, Wireless Architectures for the 21st Century 

SDR Forum Web Site

ARRL SDR page

FCC Begins Inquiry Regarding Software Defined Radio 

SDR on Google