I think cell phones have been around long
enough where we would be, at least seeing
the beginning of any negative issues of
How many cellphones are there in the world ?
500 million maybe ? So where is all the brain
damage ? Apparently it only affects lawyers.
2 watts of 900 MHz – 2100 MHz RF
I just looked up my cell phone on the
FCC database. IHDT56FY1
Maximum ERP is 29.4
dBm at the antenna connection at 836 MHz.
Maximum ERP is 29.5 at 1850 MHz.
effective radiated power is about 1 watt. Now
even if we put the phone up against our head and
assumed that our head did not change the
radiation pattern, less than 1/2 watt could go
into our head. Can 1/2 watt make a detectable
change in temperature of the tissue or fluids ?
I honestly do not know. And I have tried to
understand all that "SAR" stuff, but still do
not. (SAR = "specific absorption rate") What is
the "skin depth" of 850 MHz and 1900 MHz? I
expect that some of the highly educated readers
of RFcafe will be able to tell me.
this, because one of my favorite professors in
college, and chairman of my thesis committee was
K5AAK, Dr. Jefferson Lindsey III. He told us of
working on the antenna for the backpack that
astronauts wore on the moon. The RF link from
the backpacks to the lunar lander was 297 MHz
(as close as I remember). They determined that a
LIVE human head absorbed 297 MHz. (They were
surprised to discover that this was not the case
when testing with cadavers.) It was too late to
change the frequency. So off they went to the
moon with a cardiod radiation pattern. (The null
being the direction the astronaut was facing).
From this I infer that 300 MHz would be a risk
to humans, not 1900 MHz.
where are all the people damaged by cellphones.
We have 10s of millions of people using them for
long periods every day and we have many years of
RE: Low frequency
See the book
"Possible Health Effects of Exposure to
Residential Electric and Magnetic Fields"
published by the National Research Council
(National Academy Press 1997) ISBN 0-309-05447-8
There is precisely ONE effect from
athermal non-ionizing radiation; it causes
broken bones to heal faster.
I am amazed
how many people quote some seriously flawed
'research'. The most prevalent quotation of crap
is a research project where an idiot subject
rats to 35 millwatt per square centimeter of
microwave radiation. He pulsed the radiation at
15 Hz. His moronic conclusion is that 15 Hz (low
frequency radiation) is harmful. How anyone
would quote a guy that thinks 2450 MHz is "low
frequency" is beyond me. Also, this power level
was enough to actually change the body
temperature of the rats. Thus this is not even
in the category of 'athermal radiation'.
I am also amazed at how many people think that
microwave ovens are dangerous. Well, if you mess
up your door 'seal', I would call it dangerous
also. But they seem to think that 12 cm
radiation causes cancer. Hmmm.. they feel
perfectly safe cooking their food in an electric
oven. And many people love to 'broil'. Well..
'broiling' is pretty much cooking with
wavelengths of a micron through hundreds of
microns. (Note to many people that were educated
in the USA, a micron is 1/1000 of a millimeter,
it is not in anyway related to that freaky unit
of measurement that is called an inch.)
all see what sunlight does to everything it
hits. So much 200 nanometer and shorter
Seems to me that cooking
with 12cm electromagnetic waves would be a heck
of a lot safer than cooking with 1 micron waves.