more on Bead 'slashes mobile radiation'

[Dave Farber <dave () farber net>]

> X-Sieve: CMU Sieve 2.2
> Date: Tue, 25 Jan 2005 06:37:55 -0800
> From: Joe Pistritto <jcp () jcphome com>
> Subject: Re: [IP] Bead 'slashes mobile radiation'
> To: dave () farber net
>
> If your readership wants to try this for themselves, you can get "split" 
> cores that actually clamp over a cable.  (the best thing to do is to run 
> the cable through a number of times, the inductance goes up as the square 
> of the number of windings)..  The smallest "split" cores are fairly large 
> for things like phone headsets but i found one that's not *too* big at 
> Universal Radio.
>
> <http://www.universal-radio.com/catalog/misc/amidon.html>http://www.universal-radio.com/catalog/misc/amidon.html
>
> Amidon makes a large number of these cores that amateur radio people use 
> to reduce RF (at much lower frequencies generally than cell 
> phones).   However i dont see why they wouldn't work for cell phones as 
> well.  (although the required core size is much smaller at those frequencies).
>
> The core you want is the Amidon 2x31-1428p2  - this is a little over an 
> inch long and 3/4 inch in diameter.  There might be smaller "clamp on" 
> ones, but i havent found them.   If you wanted to cut the cable and 
> solder, you could use a much smaller core to achieve the same 
> effect.  Universal sells this one for $3.75 + shipping.
>
> David Farber wrote:
> > ------ Forwarded Message
> > From: Dewayne Hendricks <mailto:dewayne () warpspeed com><dewayne () warpspeed com>
> > Reply-To: <mailto:dewayne () warpspeed com><dewayne () warpspeed com>
> > Date: Tue, 25 Jan 2005 03:14:18 -0800
> > To: Dewayne-Net Technology List 
> > <mailto:dewayne-net () warpspeed com><dewayne-net () warpspeed com>
> > Subject: [Dewayne-Net] Bead 'slashes mobile radiation'
> >
> >   Bead 'slashes mobile radiation'
> >
> > Radiation from hands-free mobile phones can be reduced to virtually
> > zero by a simple tiny magnetic bead which costs a few pence, a
> > government adviser says.
> >
> >   Professor Lawrie Challis said clipping a ferrite bead on kits stops
> > the radio waves travelling up the wire and into the head.
> >
> >   He called on the mobile phone industry to start using them "as
> > standard".
> >
> >   The beads, which often measure less than 1cm in diameter, are commonly
> > used to stop data interference in computers.
> >
> >   Professor Challis, who is chairman of the Mobile Telecommunications
> > and Health Research Programme, told BBC News: "There is no evidence yet
> > that mobile phones are harmful to health but people have not been using
> > them long enough for us to be sure.
> >
> >   "Using a ferrite bead effectively reduces emissions to the head to
> > zero but as yet manufacturers do not put them on hands-free kits."
> >
> >   And Professor Challis, who was also on the Stewart committee which
> > looked into mobile phone safety in 2000, added: "I am not sure why, but
> > I wish they would. They could use it as a marketing technique, you
> > would think they would like to promote it."
> >
> >   While studies have shown hands-free kits reduce radiation, emissions
> > still travel up the wires on the outside and are absorbed by the head.
> >
> >   The beads work by absorbing these "unintentional" emissions.
> >
> >   Wires
> >
> >   Dr Stuart Porter, of the department of electronics at the University
> > of York, said he agreed with Professor Challis's comments.
> >
> > [snip]
> >
> >   Story from BBC NEWS:
> >
> > <http://news.bbc.co.uk/go/pr/fr/-/1/hi/health/4203077.stm>http://news.bbc.co.uk/go/pr/fr/-/1/hi/health/4203077.stm
> >
> >   Published: 2005/01/25 08:27:20 GMT
> >
> >
> > Archives at: <http://Wireless.Com/Dewayne-Net>
> > Weblog at: <http://weblog.warpspeed.com>
> >
> >
> > ------ End of Forwarded Message
> >
> >
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