Re: Faraday cage
Hi David and all,
On Sun, 30 Jun 1996, Tesla List wrote:
> >From dwt-at-efn-dot-orgSun Jun 30 09:41:34 1996
> Date: Fri, 28 Jun 1996 22:38:33 -0500
> From: David Trimmell <dwt-at-efn-dot-org>
> To: tesla-at-pupman-dot-com
> Subject: Faraday cage
> Hello all,
> I am needing to build a Faraday cage to hopefully reduce the
> interference my coil causes with my telephone and the AM radio reception
> around my house. No neighbor complaints, but just encase the FCC is
> listening. My question is: how fine of a wire mesh would you need to
> block the RF from a coil running from 200 to 350 kHz? And the
> associated "noise"? I was thinking of trying Aluminum foil strips, but
> then was thinking of the grounded capacitance around my coil, as the
> basement room I have my coil setup in is not to spacious. So I was just
> interested in what creative designs some of you may have come up with?
> Thanks for any input.
Just a key thing to remember is that the square spacings should be less
or equal to half of the wavelength of the frequency.
I usually use a 1cm x 1cm sqaure mesh - absolutely perfect.
The next thing is not to earth the cage, yet to setup a spark-gap between
the side of the cage and ground.
side of |
cage | /
|| <- piece of metal rod bent like a jacob's ladder...
| <--- earth.
The idea behind using a spark gap is to prevent voltage build up in the
Anything I've missed guys?
Hope this helps,
-- "Who are the Federal Communications Commission and why do they
want my Tesla Coil?"
| Australian Nikola Tesla Society |
| Rodney Davies |
| Email: Rodney.Davies-at-anu.edu.au |
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| The Australian National University |