archiv~1: SETI Re: Argus: CPU Lead Shielding

SETI Re: Argus: CPU Lead Shielding

Matthew G Cheung ( mgcheung1@juno.com )
Sun, 8 Nov 1998 17:44:13 -0500

As I understand it, any conductor, especially a good one, will block out
EM radiation. For radio frequencies, you would only need some wire with
holes no larger than the wavelength.
"The whole of science is nothing more than a refinement of everyday
thinking." ALBERT EINSTEIN

On Sat, 7 Nov 1998 14:58:16 EST rtyndall@juno.com writes:
>I'm not really an engineer, but I think that a lead shield would be
>more useful
>for things like nuclear reactors and x-ray generators. (Blocking
>harmful stuff).
>(I used to fix new PC & printer designs that wouldn't pass FCC class
>B).
>
>As for a RF goes, putting all the screws in the PC cover may help.
>If you want to get rid of 90% of the RFI output, try putting ferrites
>on all your
>I/O lines (printer, modem, KB, Mouse, video, audio out&in, AC & etc).
>Those I/O lines will hurt you a lot more than a leaking plastic front
>panel.
>There is not much more you can do for a CRT, besides turing it off..
>
>If your PC has a lot of low frequency output (older CPU=more HF RFI),
>you
>may consider going to a faster motherboard. I used to get wacked on
>20m..
>
>My Dish is out in the back yard, (not aimed at my PCs) so I've never
>heard any
>RFI up in the 1 to 2 Ghz range. (I've never had the cover on my
>Pentium PC).
>
>If you are not using good hardware in the shack (N connectors etc) and
>have
>a lot of alligator clips hanging on your radio's RF input (or LNA's
>with the cover
>off), you may get some RFI on you SETI rig.
>
>Lead dust is not good for you. Melt it down and make bullets or
>fishing
>sinkers, but don't use it for RF shielding. (It may not be legal to
>put in a dump)
> A few strips of metal duct tape would be a lot better. (cheap at the
>hardware store).
>In case of war, thin metal tape will also block a lot of radioactive
>particles too.
>
>Note: The above may not apply if your PC case is made entirely of
>plastic.
>As I am on east coast time, this may not be true in California. ;-)
>
>Later Dudes, Rich <>
>
>
>Richard Tyndall NJ1A Woburn, MA. USA
>RTyndall@juno.com or nj1a@erols.com
> ARGUS Observatory FN42jl
>It's not Rocket Science. it's not Brain Surgery.
> It's Rocket Surgery!
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