[Hidden-tech] EMF/radiation-reducing cell phone head sets andother products

[ussailis at shaysnet.com]

This is a subject that has interested me for some time. Here some notes
which I hope are useful:

I follow the literature in a couple of professional journals about EM
fields. The jury is still contemplating the medical impact of EM fields.
There are many factors involved: Frequency, pulsed or non-pulsed source,
power level, etc. The list goes on. So:

Yes, wired is better, but it will not eliminate the fields if you are
concerned. The transmission of alternating current of any frequency causes
an electromagnetic (EM) field.

That said, I don't worry a whit about fields contained by two wires, as the
field is mainly contained between the wires. This is not a radiating field. 

Radio fields are a far different issue, however. They are a radiating
fields, which, in theory, goes unto infinity. I am concerned when they are
local to me. The issue is 'how' local? That's a difficult question to pin
down.

Meters. Sorry, but I wouldn't trust anything you can afford to buy to be
very accurate. I assume that $10K to $50K is outside of most HTers budget.
When I have to talk a field strength measurement, I usually use some cheap
instrument, get a number & then calibrate that reading against a signal
source in the lab. If I am within a factor of 5 or so, that's probably good
enough.

Field strength measurements are difficult to take, and more difficult to
prove to any reasonable accuracy.

The answer is not yet in on cell phones. There are about as many papers
that claim there might be a problem as there are that say there is no
problem. But there are a few things you can do to lower your exposure:

1. The EM field (radio field) from any decreases as the square of distance.
That is the power density is reduced by 4 for doubling distance. So move
the thing away from your head. Any earphones will do this.

2. Cell phones increase their transmit power level if the signal from the
tower gets reduced. Likewise, power is reduced as received signal strength
increases. This is done to conserve handset battery power. So keep the
thing further from you when you hear a choppy or weak signal. 

3. A bluetooth device is also a radio transmitter. Most, but not all,
operate at a much lower power level. You might consider a bluetooth
earpiece if it doesn't advertise "has a great range" or some such thing
that indicates it is of higher than normal power output.

You can look all this up on the FCC web site (www.fcc.gov).  All you need
is the alphanumeric characters after the words FCC ID: on the back of the
device. Spaces in that character set MUST also be entered.

The first three letters is the manufactures "Grantee Code" any space and
the remaining is the manufacture's self assigned item code. 

4. Literature. The Sweeds and Fins are into worrying about medical issues
and cell phones. Their studies have some scientific rigor.

Magnetic fields;

These are a completely different thing. Do not confuse them with the
magnetic field of the AC power line. The power line has an electromagnetic
(EM) field, just like radio, but of a very, very lower frequency compared
to radio.

On the other hand a true magnetic field is static, exactly like the
magnetic field of the Earth. We humans have evolved with that field and I
don't see that it has done us in yet. It looks like a 1/2 Gauss magnetic
field is OK.

There are also much larger static magnetic fields, for example used in an
MRI scan, or from a rare earth speaker magnet. Some of these might not be
healthy for some folks.  


Jim Ussailis
jim at nationalwireless.com

Original Message:
-----------------
From: matt lampiasi mattl at florenceit.net
Date: Mon, 24 Sep 2012 12:12:19 -0400
To: hidden-discuss at lists.hidden-tech.net
Subject: Re: [Hidden-tech] EMF/radiation-reducing cell phone head sets
andother products


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