Re: [TCML] Faraday Cage Safety

[Mark X2 <susax2@xxxxxxxxx>]

Wow Alton,
that's one amazing workshop you've got there, my compliments. I hope to be
as disciplined as you are one day.
I've got some questions I was hoping you or someone else could answer about
Faraday cages:

What would be a safe mesh size to catch streamers from entering the cage.

More inportant would be, what mesh size should one use to have a Faraday
cage that's effective to keep interference within.

I only presume it has got something to to with the wavelenght of the
emitting device?

Regards,
Mark




2013/8/5 W5als <w5als@xxxxxxxxx>

> Hi Everyone
>        On July 8 I wrote a article on on EMI and EMF and faraday cage. I
> think
> It may be worth you reading it. It was a three day study I did on it. I
> think it may
> Answer some of the question too. I am no expert at this and don't claim to
> be but
> This study was in depth.
> Alton
> W5als
> http://www.flickr.com/photos/91001059@N08/
>
> Sent from my iPad
>
> On Aug 4, 2013, at 9:17 PM, ACM de Queiroz <acmdequeiroz@xxxxxxxxx> wrote:
>
> > Em 04/08/2013, às 17:53, Jim Lux <jimlux@xxxxxxxxxxxxx> escreveu:
> >
> >> The hole guideline is for rf propagation via e field, not generally
> what you would be doing.
> >> the h-field (magnetic) isn't stopped by a mesh
> >>
> >> The cage around a coil is more about stopping sparks.
> >
> > The cage attenuates time varying magnetic fields too, because they
> induce currents on it that generate opposite magnetic fields.
> > Care must be taken on wires entering the cage. They shall pass through
> filters, otherwise they works as antennas, and the cage then really serves
> just to stop sparks. It is actually very difficult to make an effective
> Faraday cage for this application. It would be simpler, and probably
> equally effective, to just use something to impede people from getting too
> close.
> >
> > Antonio Carlos M. de Queiroz
> >
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