Re: low em wave shield

From: Uncle Al (UncleAl0_at_hate.spam.net)
Date: 09/02/04 

Date: Thu, 02 Sep 2004 15:33:08 -0700

Paul wrote:
>
> Hi
>
> Can someone give suggestion on how to block low frequency em wave?
> Specifically, low frequency em wave between 0-40 Hz (frequencies that
> can effect brain.) Thanks. I thinking about making a helmet.

Skin depth. You will need lossy inductors to block it - alternating
layers of magnetic ferrite and magnetically soft alloy (e.g. Co-netic,
Mu metal, Met-glas), the whole of it grounded. It still goes in
through your face and up your ***. 

-- 
Uncle Al
http://www.mazepath.com/uncleal/
 (Toxic URL! Unsafe for children and most mammals)
http://www.mazepath.com/uncleal/qz.pdf