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For radio geeks only: I saw this on Hackaday -- a guy who built his own GPS receiver from scratch and documented it beautifully. I aspire to achieve such greatness someday. Enjoy:

http://www.holmea.demon.co.uk/GPS/Main.htm
Pictured above is the front-end, first mixer and IF amplifier of an experimental GPS receiver. The leftmost SMA is connected to a commercial antenna with integral LNA and SAW filter. A synthesized fir...
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