General overview of the NSA's TAWDRYYARD tracking beacon radar retro-reflector and the AM backscatter principle.

http://mail.blockyourid.com/~gbpprorg...

http://www.qsl.net/n9zia/vision

GBPPR Vision #25: Overview of the NSA's CTX4000/PHOTOANGLO Radar Units
   • GBPPR Vision #25: Overview of the NSA...