This goes back to the geek syndrome.
That is:
What did the circle say to the tangent line?
Stop touching me!
I think the salt mine was a tangent.
-----Original Message-----
From: Aschenberg, Mat [mailto:[email protected]]
Sent: Thursday, August 05, 1999 7:17 AM
To: '[email protected]'; Lacey,Scott
Cc: 'Price, Ed'; '[email protected]'
Subject: RE: cost effective EMC facility
I was under the impression that we were discussion the "Cost-effective" emc
testing solutions, not the cost-absurd solutions. Maybe salt mines are going
for a lot less these days.
> -----Original Message-----
> From: [email protected] [SMTP:[email protected]]
> Sent: Thursday, August 05, 1999 2:28 AM
> To: Lacey,Scott
> Cc: 'Price, Ed'; '[email protected]'
> Subject: RE: cost effective EMC facility
>
>
>
>
> A very large EMC test site has been operating underground in England for
> some
> years. This is in Cheshire where salt is mined, leaving large underground
> open
> spaces surrounded by absorbing salt-laden walls. The reduction in ambient
> emissions is another benefit of this site. As an article in the UK EMC
> Journal
> reports (http://www.emc-journal.co.uk/archive1/980402.html) , it is now
> run by
> Celestica.
>
> Roger Viles
> WWG
>
>
>
>
> "Lacey,Scott" <[email protected]> on 04/08/99 16:37:09
>
> Please respond to "Lacey,Scott" <[email protected]>
>
> To: "'Price, Ed'" <[email protected]>
> cc: "'[email protected]'" <[email protected]> (bcc: Roger
> Viles/PLY/Global)
>
> Subject: RE: cost effective EMC facility
>
>
>
>
>
> Ed,
>
> I find your idea of a salt water ground plane very intriguing. I imagine
> the
> salts used would involve more than just table salt, and the chemistry
> would
> have to be checked and adjusted regularly, similar to a swimming pool. The
> problem of stratification could easily be solved with circulator pumps,
> which would be turned off just prior to actual use (those of you near
> fault
> lines might take advantage of natural agitation, your salt water pools
> would
> be "shaken, not stirred"). : )
>
> On a related note, does anyone have any experience doing EMC scans below
> ground? It seems that the earth would be about the lowest cost shielding
> material available. Perhaps an updated and enlarged version of the early
> pioneers "soddie" (sod hut) might be just the ticket. It might even
> incorporate a salt water ground plane. A side benefit would be that EMC
> engineers might gain some useful exercise by swimming a few laps at lunch
> time (how many laps around the turntable/raft equals one mile?). : )
>
> Scott Lacey
>
> -----Original Message-----
> From: Price, Ed [SMTP:[email protected]]
> Sent: Monday, August 02, 1999 5:35 PM
> To: 'Arun Kaore'; '[email protected]'
> Subject: RE: cost effective EMC facility
>
>
> Arun:
>
> I was just struck by what you said about "setup a Sea Plane or a
> salt water
> based site" . Has anyone ever set up an OATS using salt water as
> the ground
> plane? Talk about excellent surface smoothness, easy to level and
> cheap
> material, plus simple repair! (Uhh, could we say it fixes itself?)
>
> Just what conductivity would be enough? Could we get enough
> conductivity
> before we reach salt saturation?
>
> I suppose the upper limit on surface area would be when we get to
> the point
> of the wind causing surface ripples. Or gravitational tides.
>
> Turntables might be a lot cheaper, too. Just a thin raft that
> floats.
>
> Seriously, has anyone tried this for an OATS? (I seem to recall the
> US Navy
> had a really big ship simulator here in San Diego, where they placed
> scale
> models of ships on a sheet-steel "sea" in order to model HF wire
> antennas.)
>
> Regards,
>
> Ed
>
>
> :-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-
> ):
> -):-):-):-):-):-):-):-):-):-):-):-):-):-):-)
> Ed Price
> [email protected]
> Electromagnetic Compatibility Lab
> Cubic Defense Systems
> San Diego, CA. USA
> 619-505-2780 (Voice)
> 619-505-1502 (Fax)
> Military & Avionics EMC Services Is Our Specialty
> Shake-Bake-Shock - Metrology - Reliability Analysis
>
> :-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-
> ):
> -):-):-):-):-):-):-):-):-):-):-):-):-):-):-)
>
>
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