Posted by
charles-2 on
URL: https://www.es-forum.com/shielding-tp1535782p1535792.html
Hello Emil,
I am sorry, but I disagree with you.
All shielding for low frequencies must be grounded. That is right.
But for high frequencies that is not neccessary.
Sometimes it is even impossible.
The exception is this paint, because it is electrical conductive, and
therefore it MUST be grounded.
Canopies, curtains, window pane films are never grounded.
The received radiation is transformed into heat.
If you use certain fabrics or woven stuff, which can also shield electrical
alternating fields, than these materials MUST be grounded also.
When I walk with my cap, or T-shirt or normal shirt, these are not grounded
either, and I am not charged up.
Greetings,
Charles Claessens
member Verband Baubiologie
http://members.rott.chello.nl/cclaessens/http://www.hese-project.orgchecked by Norton Antivirus
----- Original Message -----
From: "Less EMF Inc." <
[hidden email]>
To: <
[hidden email]>
Sent: Tuesday, February 10, 2004 22:41
Subject: Re: [eSens] shielding
> At 07:35 PM 2/10/2004, you wrote:
> >Charles, one more question to you - you mentioned "shielding the room".
As
> >I mentioned regaring canopies, they do the job, but shiled only the bed.
I
> >have done a lot of thinking on how to shield a room, but even if we
> >neglect magnetic field from power lines, MW radiation is extremely hard
to
> >shiled. What do you generally suggest for propper shielding? If I wanted
> >to live in urban areas, I would have needed attenuation of up to 1000
> >times, as phone masts are all over...
> >
> >Drasko
>
>
> Hi Drasko,
>
> For walls, ceilings, doors etc., there is an excellent shielding paint
> called CuPro-Cote (
http://www.lessemf.com/paint.html). It is a water based
> latex paint (easy to apply and easy to clean up) which has copper
> particles. Attenuation is very good: over 75 dB from 1 MHz to 1 GHz. I
> would guess that the shielding performance is still good at higher
> frequencies, but it has not been formally tested above 1 GHz. You can
paint
> over it with normal latex paint to adjust color.
>
> For windows, mesh type fabrics are available to make drapes (or drape
> linings). The mesh fabrics allow light and air to pass. For example,
> See-Thru Fabric is available in 12 foot wide by any length you want.
> (
http://www.lessemf.com/fabric.html)
>
> As always, RF shields should be grounded (Earthed). Controlling leakage
> points is critical for high attenuation RF shielding. Small leaks, such as
> around a door or light switch can reduce overall shielding in the room to
> 20 dB, even if the walls are covered with 80 dB material.
>
> Emil