Subject:  A few practical questions (Kingsbury)..
Date:     Tue, 25 Jan 2000 200601 -0600 (CST)
From:     "Roy L. Beavers" 
To:       emfguru 
--------------------------------------------------


......I think we are going to have some fun with this.....
Hope we will hear from a good number of our best qualified people --
Duane, Alasdair, Clas, Bill, etc.....  (I can't name All of them....!!)

Roy Beavers (EMFguru)
roy@emfguru.com

.....It is better to light a single candle than to curse the darkness.....
                    NEW!!! Website... http://emfguru.com
...................People are more important than profits.................

             DO YOU KNOW OF OTHERS WHO SHOULD BE ON THIS LIST???

---------- Forwarded message ----------
Date: Tue, 25 Jan 2000 17:38:21 -0500
From: Bill Kingsbury 
To: rbeavers@llion.org
Subject: a few practical questions...

 Hi Roy,

 I need help with a few practical questions, that perhaps some of
 the knowledgeable members of this list could help to answer...

 1) Could someone help supply some guidelines for shielding people
 from a microwave (cell phone) base station, situated ~200 feet
 west of an apartment building (at about 5-10 degrees elevation) ?

 [Some other apartments are only ~30 feet from this mw antenna!]

 Would adding a layer of metal screen inside the west wall work to
 block most of the microwaves?  (There are no west windows, and
 the screen could be covered over with acoustic tiles, etc.)

  - What maximum mesh-size (openings in the screen) would be
    needed to shield both 900 Mhz and 2.4 Ghz microwave radiation?
    (Is there a simple formula to solve this type of question?)

  - Would ordinary (or fine-mesh) aluminum window screening work?
  - Would the screening need to be grounded to earth - or not?
      (considering the factors described below)
  - Would ordinary (or heavy gauge) aluminum foil be preferred?
  - Should steel or copper foil be used, rather than aluminum?


 2) A separate question:

 The recent article, 'Understanding Ground Currents' by Duane A.
 Dahlberg, Ph.D., notes that artificial ground currents are
 intentionally present, nearly everywhere.  This leads me to ask
 if the following technique should be avoided: 

 Some have claimed 'better sleep' may be possible by placing a
 grounded, conductive sheet under one's mattress.  For instance:

   " The Lokosana Mat is a thin conductive layer which you
    place under your mattress and then ground to Earth. 
    Testing has shown that it can protect the sleeper from
    50/60 Hz electric fields from household wiring, as well
    as uni-directional fields caused by static charges,
    water veins and geological faults.  These fields, if
    unprotected, are believed to burden the biological
    system and weaken the body's natural resistance. "


 Question:  Could the above technique pose a hazard, if the earth
 (that the mat is grounded to) contains stray ground currents,
 where a Trifield meter shows continuous, random, and very
 'agitated' transient fluxuations in the low level ambient
 magnetic fields (0.1- 0.6 milligauss) -- both near the outdoors
 grounding rod, and also above the mattress (prior to gounding) ?  

 Could the stray ground currents and magnetic transients add a
 more undesirable emf condition into the grounded mattress pad,
 through the grounding wire? 

 That is, could sleeping with one of these grounded mattress pads
 (in the above described location) do more harm than good -- or
 could it actually provide a relative (healthful) improvement?


 3) Also.... is there a way to 'phase reverse' the transients
 which are 'tapped' by the ground wire -- so they help to cancel
 the transients that also existed indoors, above the mattress
 (prior to installing the gounded mat) ? 



 Many thanks, in advance, for help with these technical problems.

 Bill Kingsbury

 kingsbry@gte.net







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Reprinted with permission of Roy Beavers, http://www.emfguru.com