Subject:  A question about Antennas (Teule).
Date:     Thu, 05 Oct 2000 060118 -0500
From:     Roy Beavers 
To:       guru 
--------------------------------------------------

........A very interesting question has been forwarded below from the
Netherlands.....!!!

Yes, Gerrit, the phenomenon of electromagnetic radiation "reinforcement" 
has been addressed before on EMF-L, though it cannot be said that there
is much actual "scientific" evidence to cite.  I recall some of our 
"technical" experts (Tegenfeldt, Philips, etc...) discussing it -- or 
suggesting it -- and I believe some of that discussion could be found 
in our archives. Most recently, the work that is being done by Bill Curry 
(and reported by Bill at the Salzburg Conference) is something you should 
definitely get hold of......  Bill's paper is reprinted in the Salzburg
Conference Proceedings.  Some "heavy" math there.......guru......

-------- Original Message --------
Subject: A question about Antennas
Date: Thu, 05 Oct 2000 12:27:54 +0200
From: teule 
Reply-To: teuleger@wxs.nl
To: roy@emfguru.com
CC: Wim Roskam 
References: <39DBB912.F2A91BE0@emfguru.com>

Dear Roy,

I got an interesting question from a reader of one of my articles. It's about
antennas, in particular the combination of several antennas. You mentioned this
problem several times, but this question goes a bit further on that road.

It is un deniable true that we are surrounded bij several GSM antenna's and
other sources of radiation (radar, electrical engines, speed control etc.). His
question is this: if you throw some stones in a swimming pool at different
positions, than the waves spread out over the whole pool. When these waves meet
each other, than you get at certain points strong waves or even wild moving
water. The places of these strong movements are difficult to predict. That
depends on the shape of the pond, the places where you throw in the stones and
of course the timing.

If the same phenomenon is valid for electromagnetic waves, than we might expect
in the real world a lot of places, where radiation really gets out of hand,
although the distance to the GSM towers do not suggest a problem. These places
depend on antenna-placement, the siting of buildings, reflections (glass or
aluminium walls?), and your own position. Walking though a city can, in EM
sense, become an interesting experience.

Do we have any experience or measurements on this possibility? Did anyone ever
do a series of measurements during a stroll though a city?  The question is
simple, but I suspect that the answer is overwhelmingly complicated. This looks
like chaos-theory, does n't it?

Gerrit Teule
Netherlands


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