Subject:  Comments on frequency (fwd)
Date:     Mon, 8 Dec 1997 090431 -0600 (CST)
From:     "Roy L. Beavers" <rbeavers@mail.llion.org>
To:       emfguru@hotmail.com
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---------- Forwarded message ----------
Date: Sat, 6 Dec 1997 20:49:20 -0600
From: "Marjorie A. Lundquist" 
To: rbeavers@mail.llion.org
Subject: Comments on frequency

 Roy, this will be a brief comment on frequency, which is VERY important.
I have not studied Dr. Lai's work, so don't know what he has been thinking.
But there is one reason why a person might think that the frequency does
not matter much (although it really does).
 First, I must emphasize the distinction between the EM field around an
EFFICIENT antenna (radiating at RF or microwave frequencies) and the EM
field around an INEFFICIENT antenna.  These two fields are very different,
the latter being much more hazardous to health than the former (for the
same frequency, and possibly the same input power).
 Most RF information comes from EFFICIENT antenna fields.  Only now are we
beginning to pay attention to the fields around INEFFICIENT antennas.
 When RF is put on a power line, the RF field around the line is the field
of an INEFFICIENT antenna.  Kilohertz frequencies are used for this.
 I have satisfied myself that these RF fields around power lines (at kHz
frequencies) are as hazardous to health as are microwave frequencies from
an efficient antenna operating at high megahertz or gigahertz frequencies!
 The role of frequency becomes clear when one is careful to compare one
frequency with another ONLY for different EFFICIENT antenna fields (or only
for different INEFFICIENT antenna fields).
 The EFFICIENT and INEFFICIENT antenna fields are as different as apples
and oranges, and cannot be compared with each other in a legitimate way--
at least, not without a clear understanding of the differences between
these two kinds of fields.
 But if you compare apples with other apples and oranges with other oranges
then the effect of frequency can be seen with little confounding.
 The above may be too superficial to produce real understanding in readers,
but I don't have time to offer a more detailed discussion now.
 I am thinking of putting on a course (real-life, not over the internet).
I wonder how many people would be interested in attending? -- Marjorie

.-


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Reprinted with permission of Roy Beavers, http://www.feb.se/EMF-L/EMF-L.html