I believe the Isrealies have developed a system that was being sold in
Australia and apparently works quite well on GSM - although our equiv to the
FCC didn't like its use and has declared it illegal

wish they would also declare the cellphones as illegal

Rex

----- Original Message -----
From: "Scott F. Touchton" <Scott.Touchton@US.JDSUNIPHASE.COM>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Friday, March 23, 2001 11:25 PM
Subject: Re: [EE]: How to jamm a cell phone, and going offtopic


> This brings to mind a military system I heard about, but could never find
any
> info on.  Supposedly, someone has developed a communication system based
on
> wavelength that prevents reception after a certain distance.  I can't
picture
> the physics of this in my brain.
>
> Has anyone out there any knowledge of this?
>
>
> |--------+--------------------------->
> |        |          Bond Peter       |
> |        |          S-petbond1       |
> |        |          <Peter.s.Bond@MOT|
> |        |          OROLA.COM>       |
> |        |                           |
> |        |          03/23/01 08:56 AM|
> |        |          Please respond to|
> |        |          pic              |
> |        |          microcontroller  |
> |        |          discussion list  |
> |        |                           |
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>
>---------------------------------------------------------------------------
-|
>   |
|
>   |       To:     PICLIST@MITVMA.MIT.EDU
|
>   |       cc:     (bcc: Scott Touchton/US/UNIPHASE)
|
>   |       Subject:     Re: [EE]: How to jamm a cell phone?
|
>
>---------------------------------------------------------------------------
-|
>
>
>
>
>
> > Give it a try, stop people from using cell phones in your
> > house or shop.
>
> Yeah, go for it.  See what happens to you as a result.  The licences get
> sold at very high prices to people who can afford them.  These same
> organisations tend to be less than happy at people interfering with their
> right (real or imagined) to use the frequency band they have purchased the
> rights to.
>
> > Why should someone else be allowed to tell you what RF you
> > are allowed to
> > use on your property.  Just don't take it further than that.
>
> ???
> RF doesn't exactly stop at an arbitrary boundary.  Being radiation, it
sort
> of... well.. radiates.  Outwards.
>
> I can pick up our on-site picocells on my mobile outside the boundaries of
> the site.  Bear in mind - this stuff is developed, tested and analysed
> minutely - not some jury-rigged lashup.  (Honest!)
>
> > As long as you
> > are not effecting people who are not on your site then what's
> > the problem?
> > One good reason for doing this may be to stop workers from
> > sending text
> > messages and chatting on their mobiles when they should be working.
>
> Possibly.  However, the majority of people around me using their mobiles
are
> doing so for work. YMMV.
>
> If you *really* want to jam cellphones, you want a basestation with
> sufficient power to swamp the other stations in the vicinity.  Bear in
mind,
> they tend to be large, not terribly mobile and require sizeable antenna
> (which over here, require planning permission).  You'd only need one radio
> (GSM - TDMA), as you'd only need to knacker the BCH.
>
> I'm sure I could put you in touch with someone who could sell you one...
<G>
>
> Peter
>
> --
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>
>

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