Re: faraday cage questions (fwd)

["High Voltage list" <hvlist@xxxxxxxxxx>]

Original poster: Steven Roys <sroys@xxxxxxxxxx>



---------- Forwarded message ----------
Date: Sat, 30 Dec 2006 15:49:09 -0600
From: Steve Ward <steve.ward@xxxxxxxxx>
To: High Voltage list <hvlist@xxxxxxxxxx>
Subject: Re: faraday cage questions (fwd)

Thanks for the "working man's" examples Peter.  I guess im just going
to have to try something and see if it works, hopefully with nothing
too bad resulting from improper blocking of the RF.  If chicken wire
is cheap enough, i could indeed enclose an entire area of the
basement, and also use that as workspace when needed.  More planning
is needed here.

Jim,  To clarify, you are saying that the magnetic fields produced
within the cage are "OK" provided that the cage is not the return path
for this current?

Steve

On 12/27/06, High Voltage list <hvlist@xxxxxxxxxx> wrote:
> Original poster: Steven Roys <sroys@xxxxxxxxxx>
>
>
>
> ---------- Forwarded message ----------
> Date: Wed, 27 Dec 2006 01:12:45 +0900
> From: Peter Terren <pterren@xxxxxxxxxxxx>
> To: High Voltage list <hvlist@xxxxxxxxxx>
> Subject: Re: faraday cage questions (fwd)
>
> I have experience with 3 different Faraday cages.
> The first is a $20,000 dollar one at a science museum.
>  http://tesladownunder.com/Tesla%20display.htm#Scitech
> Uses fairly fine mesh (?1 1/2 inch square) with special care to avoid long
> thin gaps between panels and the door. I recall some springy coiled strip.
> Out of your price range but works and has been "certified" by professionals.
>
> The second is my 8 foot cube made such that each of the faces of 8x8 will
> fold into a 4x8 to be able to fit through doors. It is simple but still a
> pain to set up and takes an hour or two. I use this for all my public
> displays. It is made of chicken wire with the hexagonal holes of about 2
> inches. Does it work? I think so.  Certainly the fluorescent light fitting
> 12 inches above it did not light up at all and I have runs audio and
> computer stuff not far away. I join the RF earth to the cage and also the
> mains earth which grounds the box that my Terry filter is in. The Terry
> filter is just inside the cage.  Run all your earths to the cage.  I was a
> bit careless about this and was getting some potential between my controller
> box and the cage last time I used it.
> http://tesladownunder.com/tesla_coil_sparks.htm#4%20inch%20coil
>
> The third one I used is simply a roll of 4inch square hole ringlock fencing.
> There is enough to make about a 6 foot diameter cylinder and there is a bit
> for the top. The idea is that it is adjustable and can fit through doors
> etc. The TC base has a counterpoise of a 2 foot square aluminium plate with
> extensions to support whatever diameter you choose.
> http://tesladownunder.com/Tesla%20display.htm#Tesla%20coil%20(Physics%20Dept)%202006
>
> So what would I do in your situation? None of these.  Just line one corner
> of your basement up to the roof with chicken wire on a simple wooden frame
> tacking it on with a wood stapler. Make some sort of door sized flap. Have
> something on the floor as well so that all six sides are covered.  How
> collapsible and clever you make it depends on you.
>
> Peter