I took the Homebrew PCB Group Spiral Challenge, for my initial results see: http://wa0uwh.blogspot.com/ or an on site search for; PCB 72 - Eldon - WA0UWH - CN88xc - http://WA0UWH.blogspot.com/
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Spiral Challenge
2011-08-02 by Eldon Brown
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2011-08-02 by Eldon Brown