Re: faraday cage questions (fwd)

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

Original poster: Steven Roys <sroys@xxxxxxxxxx>



---------- Forwarded message ----------
Date: Wed, 3 Jan 2007 13:14:35 -0600
From: Steve Ward <steve.ward@xxxxxxxxx>
To: High Voltage list <hvlist@xxxxxxxxxx>
Subject: Re: faraday cage questions (fwd)

Hah! of course.  that makes perfect sense (i admit, i never *really*
thought about how the cage worked in detail).

I have some updates on my progress:  I did test a small SSTC (only
3-4" output spark running a few hundred watts) in the basement.  No
complaints from the house-mates despite TV and other electronics just
upstairs.  This is fine and all for the tiny SSTC, but when i start to
tinker with marx-gen's and my larger tesla coils, im sure i will want
a cage.  I might in fact already have the perfect space to build a
semi-perminent cage.  I will update the list if/when i tackle this
project.

Thanks again to everyone for their comments and suggestions, i did
learn a good bit about cages ;-).

Steve

On 1/2/07, High Voltage list <hvlist@xxxxxxxxxx> wrote:
> Original poster: Steven Roys <sroys@xxxxxxxxxx>
>
>
>
> ---------- Forwarded message ----------
> Date: Tue, 02 Jan 2007 07:25:23 -0800
> From: Jim Lux <jimlux@xxxxxxxxxxxxx>
> To: High Voltage list <hvlist@xxxxxxxxxx>
> Subject: Re: faraday cage questions (fwd)
>
> At 07:23 PM 1/1/2007, you wrote:
> >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)
> >
> >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?
>
> Exactly.  Consider a Marx inside the cage.  If the Marx discharges to
> the cage, and the return path is through the cage, inevitably, some
> amount of the current is going to flow on the outside of the cage and
> radiate (especially if the cage is woven wire).
>
> OTOH, if the entire current path is inside the cage (with no current
> flowing in the cage), then the cage can do its shielding function (at
> least for higher frequencies), and if some of the cage current (and
> there will be some... that's how the cage does the shielding.. a
> current of opposite sense is induced in the cage wall) does propagate
> to the outside, it is smaller in magnitude.
>
>
>
>
>