George, I'm no medical expert either but I think I understand a few laws of
physics, Gauss's law, and Maxwell's equations in particular. If there is to be
any effect on the human body, surely it must be directly from the magnetism or
indirectly from the induced currents. To the best of my knowledge there never
has been a demonstrated effect on the human body by magnetism. That leaves
induced currents.
Many ham and commercial handy talkies (HT) can put out 5 watts. When used, the
rubber ducky runs right by the face or ears. From personal experiments I can
say looking directly at the sun causes a noticeable heating effect while using
my 5 watt HT @ 146MHz at night doesn't. The skin effect (not to be confused
with human skin) means that almost none of the energy penetrates the skull at
146 MHz. If it doesn't penetrate, how can it cause an effect?
As you point out modern cell phones put out much less power (<100 mW). Since
the skin effect is much greater at cell phone frequencies, I don't think there
is a snowball's chance of a cell phone causing damage to any part of the body
with the possible exception of the eyes. There is anecdotal evidence that
looking at a functional cell phone while driving can cause injury and even
death to the whole body.
Fred Townsend
DC to Light
Tang, George wrote:
My personal opinion is that the research findings MAY have some valid
points,
however, the data they have is way out-dated. We know that in the late '80s,
people use mobile phones that put out several watts of radiated power. In the
early '90s when cell phones were just starting to appear on the market, most
of them were still putting out more than 1 watt of radiated power. We have
heard of technicians who worked on LAN equipment while talking on the cell
phone, and the cell phone radiation induced data error in the Ethernet lines.
Those were the days when the cell phone transmitted too much power. In the
last few years, the goal of achieving longer talk time, thus lower power
consumption, and the use of low voltage electronics due to the widely
incorporation of sub-micron transistors have limited the cell phone
transmitted power down to low mW range. The research is so far behind the
improvements in technology that their findings are out-dated by the ne
w products on the market today. Of course, I am not a medical expert
in the
cancer field, and I do not design or manufacture cell phones, so I certainly
cannot speak for the experts in these areas. But I do know that these
findings most likely are not applicable to the products out on the market
today.
George Tang
-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Fred
Townsend
Sent: Thursday, July 24, 2008 12:09 PM
To: Derek Walton
Cc: IEEE EMC Discussion Group
Subject: Re: Another Cancer Scare?
I heard the interview. The doctor appeared to dodge the question as to
proof. He did say more research was needed (Ignoring this subject has
already been extensively researched.). It appeared to be a blatant
attempt to get research funding.
Fred Townsend
DC to Light
Derek Walton wrote:
Does anyone know more about the research spoken about in the
BBC news
artical?
http://news.bbc.co.uk/2/hi/health/7523109.stm
Is it really new unpublisged research or just rehashing the old?
Sincerely,
Derek Walton L F Research
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