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[aprssig] Simplest P-n-P APRS WX stn

Scott Miller scott at opentrac.org
Mon Jun 22 18:14:57 UTC 2009

> and send it out here.  The main benefits of these derive from sonic 
> anemometers that need to be carefully aligned to north, but which have 
> no moving parts, and require maintenance and calibration much less 
> frequently.

Why do these need to be aligned any more carefully than mechanical 


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