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Re: Implications for wearables

From: Thomas Geer <>
Date: Mon, 13 Sep 1999 13:24:30 -0400 (EDT)

Hmmn,
I remember, possibly incorrectly, that a f-cage will protect you from
standard EM interference, but not from an emp. The analogy was on the
order of stopping ordinary vs laser light source. I think
that lead and or stell shielding must be used to stop the pulse from
either a nuke or an emp gun. I guess it al depends on the strenght of the
pulse.

I don't think you are allowed to protect your electronics from emp's. The
standard FCC warning on all pocket electronics should make that clear. YOu
know the one, reads something like this device must accept all
interference wether destructive or not. You can find it on all pocket
phones, calculators etc. I think that basically means that if the "fit
hits the shan" so to speak that FEMA or whomever will simple pulse our
sorry asses into pre pda bliss.

#endrant
thom

 On Mon, 13 Sep 1999, Claudius Li wrote:

> > Neal Stephenson wrote about an EMP gun used to disable vehicles and computers 
> > in his novel CRYPTONOMICON (which is excellent, by the way, and highly 
> > recommended to this list).  How can I protect my house, computer, car, etc. 
> > from this kind of disruption?
> 
> A large EM pulse is bad because when they move orthoganally accross a wire
> they induce a current down that wire. This current won't necessarily go in
> the direction the wire was mean to carry current. And it may be larger
> than the amount of current the wire was meant to be able to withstand. 
> 
> But there is something you can do about it.
> 
> Just surround your house with a Farraday(sp?) cage.
> Get alot of tin foil.
> Wrap it around your house.
> Make sure it's grounded well (try attaching it to your lightning rod).
> 
> Now when the EM pulse hits the tin foil it will be turned into current.
> The current will drain into the ground. And the EM pulse will not continue
> on its way through your house.
> 
> 	-Happy tinfoiling
> 
> 
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