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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  |
|        |                           |
|--------+--------------------------->
  >----------------------------------------------------------------------------|
  |                                                                            |
  |       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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