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Article #18

Re: Can mobile phones destroy sensitive electronics?

#18
From: w_tom
Date: Fri, 25 May 2001 05:13
59 lines
4654 bytes
  The most 'damage' we suffered was some millivolt changes on the long wire to
the weigh scale.  Millivolts don't create surge damage.  Those are the numbers
we saw.  We never say any major transients on oscilloscope displays.
Frequencies were shortwave single digit watt transmitters right against open
equipment, sub 1 watt VHF transmitter, and a 1 gigahertz battery operated
transmitter.  None created enough noise to crash the microprocessor.

  I am not making unsubstantiated claims of surge damage from mobile phones.  If
you make the claim, then please provide some supporting numbers.  I should warn
you that I keep putting this challenge up  and meet this same response - "I will
make the claim so you must refute it with numbers".  I would love just once to
see some numbers support these so many claims of EMP induced failures.  In
response to so many numerous claims for numbers, never once have these numbers
been provided.

  Noise interference does not prove an RF noise will damage the semiconductors.
It just proves that semiconductor operation can be interrupted by noise.  There
is a major voltage difference between noise induced interruptions and
destructive semiconductor failures.   Battery operated radio receivers are
constanlty interrupted by nearby lightning strikes and yet never suffer
damage.   If your E-M fields were so destructive, then why are the front end
transistors of sensitive radios not routinely damaged?  Let me suggest one
reason.  Those EMP fields required for such damage just don't tyipcally exist.

David Emrich wrote:

> "w_tom" <w_tom1@usa.net> wrote in message news:3B0D8903.2486233E@usa.net...
> >    How many have seen EMP?  How many nuclear blasts have you encountered
> lately?
> > What are the numbers associated with such fields?  The many examples are
> operations
> > interrupted (ie computer crashes) because a very strong signal was able to
> create a
> > minute voltage - a temporary interruption and no where near required for
> > semiconductor damage.
> >
> >    We would do this often.  Open the steel cases and run transmitters
> inside the
> > system. Only to make sure the design was solid.  Semiconductor damage was
> > never even a possibility
>
> Since you're a numbers man, what kind of transmitters? What frequency(s)?
> What signal strengths? How can you guarantee that it was "never even a
> possibility".
>
> I guarantee you, regardless of whether you take the covers off your mobile
> phone or not, if you stick it in the microwave [DO NOT TRY THIS AT HOME], RF
> energy WILL DESTROY semiconductors! (And just about everything else in the
> phone too!).
>
> My point is that it's a levels/frequencies based discussion.  Sure, there is
> a background RF "noise" radiation present all the time. Sure electronics
> goods should be designed to survive (in fact operate properly) at those
> levels of RF.  But at the other end of the scale, you can (in theory) keep
> cranking up the output of the RF, and eventually you will destroy
> semiconductors.  I'm not saying they'll be the first components to fail, but
> they will eventually fail.
>
> David.
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From: w_tom <w_tom1@usa.net>
Newsgroups: sci.electronics.misc,sci.electronics.components,sci.electronics.basics,aus.computers,aus.electronics
Subject: Re: Can mobile phones destroy sensitive electronics?
Date: Fri, 25 May 2001 01:13:52 -0400
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