Re: Faraday cage

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Jim Lux by way of Terry Fritz <twftesla-at-qwest-dot-net>" <jimlux-at-earthlink-dot-net>

The general guideline is that the perimeter of the holes should be less than
the wavelength of the energy you are trying to shield (give or take a factor
of 2 or 3)...

Any conductor penetrating the holes makes it useless for shielding (woven
screen isn't all that wonderful, for this reason... use welded mesh)

Magnetic shielding is a true and royal pain in the .....


----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Friday, May 10, 2002 7:09 AM
Subject: Re: Faraday cage


> Original poster: "Paul Benham by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<paulb-at-woodanddouglas.co.uk>
>
> Hi Terry,
>
> If you construct it properly so all the seams are soldered and the door
has
> berilyum copper fingering all the way around, ie no slots, and the
material
> is conductuve enough, then it will attenuate the magnetic fields as well
as
> the electric fields, and work as a true faraday cage.  If you are only
> interested in attenuating the electric fields then you do not need to be
> that fussy regarding continuous conductivity all the way around with no
> slots or holes.  I think that getting chicken wire or screen mesh and only
> soldering the sides at the corners is not a good idea.  The size of the
mesh
> will determine the highest frequencies that it will attenuate.
>
> Cheers,
>
> Paul.
>
> ----- Original Message -----
> From: "Tesla list" <tesla-at-pupman-dot-com>
> To: <tesla-at-pupman-dot-com>
> Sent: Friday, May 10, 2002 2:21 AM
> Subject: Faraday cage
>
>
> > Original poster: "Terry Fritz" <twftesla-at-qwest-dot-net>
> >
> > Hi All,
> >
> > I was thinking of making a simple Faraday cage.  I have a lot of
computer
> > and other electronic stuff creeping all over the house and though it
would
> > be nice to have.  Maybe like a 6 foot cube.
> >
> > I was thinking of a simple 1x2 wood frame with aluminum screening.
> Simple,
> > fast, and easily handled.  Not real big and easy to take down.
> >
> > I had the following questions:
> >
> > 1.  Is there any chance of setting the aluminum (bug screen as on
windows
> > and doors) on fire?  I know some metals like steel wool can light up and
I
> > just wanted to check on aluminum screening.
> >
> > 2.  Arcing directly to the screen will tend to transmit RFI and magnetic
> > fields go right through it, but do you think it would be worthwhile?
> >
> > 3.  Any construction tips?
> >
> > Cheers,
> >
> > Terry
> >
> >
> >
> >
> >
> >
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>