[hpsdr] Input protection circuit

[Graham Haddock]

Achim:
Thank you.
Good to see another EagleCAD enthusiast on HPSDR.  :-)
--- Graham / KE9H

Achim Vollhardt wrote:
> ***** High Performance Software Defined Radio Discussion List *****
>
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> Dear all,
> here a proven and very efficient input protection circuit..
>
> Uses a Mini Circuits Autotransformer TC1.5-1 , two 22nH inductances and
> a 220 Ohm resistor to dampen an inherent resonance of the autotransformer.
>
> With this one, a HF circuit survives a direct hit from an kilovolt-ESD
> test gun to the signal line.. :) effect on signal line is less than 1dB
> up to 1 GHz. Proven and used already.
>
> Feel free to use,
> 73s Achim, DH2VA
>
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