Build Your Own Faraday Cage, Stop Nosey Listeners, and Survive, page 4
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reply posted on 20-4-2011 @ 04:32 AM by WatchRider
Originally posted by RelentlessLurker
reply to
post by Sforscott



mylar is conductive?



You want it to be, so that you pass the EMP around it and down to a ground


reply posted on 30-7-2011 @ 03:18 AM by donawesome
I used to do Car Audio System installs. I think it was a 98 Ford F Series truck, was manufactured with the main wire harness path located just under the dashpad. A good mechanic can probably correct me if it was a different year, but it dfoesn't really matter. :-) This was done, I believe, to reduce RF noise into the electrical accessories, therefore reducing the interference to the "Brain". However, it was right over top of the stereo. The factory stereo was properly shielded and grounded, but when we installed anything aftermarket, we had a terrible noise to deal with. Since I was the Manager and Lead Installer, it was up to me to figure out how to eliminate the problem. Unfortunately (or fortunately, depending on perspective) I couldn't just Google it!!! The internet wasn't quite ready yet, it was still just Bulletin Board Services....talk about the DARK AGES!!! Anyway, after much experimentation and research, I finally read about Faraday cages. And that's what worked to shield the electronic pulses I was out to eliminate.
My purpose for giving you this information is, there was quite a lot of trial and error, what did and what didn't work, and I think some of these lessons can be extrapolated to apply to what you are trying to do.
What worked the best was copper mesh, completely around the stereo with no breaks or gaps. Where the mesh had to be joined, I had to fold it together in such a way as to be as 1 continuous piece. The tricky part was the shield itself could not come into contact with the body of the stereo at any point other than the single ground location, which had to be the body of the stereo.The stereo had to be covered in non conductive material (I used cardboard). The wire harness had to also be seamlessly shielded with the stereo to eliminate all noise. Aluminum foil only cut out about half the noise,even fashioned the same seamless, isolated way. Solid copper plating didn't seem to do any good at all, possibly because I didn't weld the seams, etc.
An important note, as I remember which would apply here, is I couldn't just shield 3 sides, (leave the bottom open).I could however leave open the face sticking out of the dash.

I can't think of anything else relevant and hope this helps. If anyone has any questions, please raise your hand and I will get to you as soon as possible. Thanks.

Awesome
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