> Let me explain a little further. Here in Brazil last
> month we had the biggest rebelion on our prisions.
> The rebelion was controlled by cell phone from inside
> the prision. We want to jamm the cell phones inside
> the prision.
> Don't me ask why the cell phones are inside the prision.

OK - that is a little more info, thanks.  Heard about it.  So my "more bars
on the window" flippancy was more accurate than I'd have guessed?

> What is BCH? could you put me in contact with someone who
> couls sell me one?

Sorry - I was being somewhat facetious.

BCH is the channel on GSM that mobiles need in order to work.  It is a known
freq (has to be!), and without it, there is no network.  Just off the cuff,
a basestation probably *could* be set up to do what you ask, and set the
power according to required range.  HOWEVER - it would almost certainly
affect people outside the site - they'd lose network coverage.

Of course, I don't know whether Brazil uses GSM or not.

If you seriously want to get this done, your best bet would be to contact a
sales rep local to you - I think ours can be found from the web site, but in
order to avoid accusations of commercial bias, I probably ought to recommend
Nokia, Ericsson et al too!

Simply put - I don't think this is a trivial (or likely PIC-based) solution?
Nor will it be cheap.

HTH

Peter

--
http://www.piclist.com hint: PICList Posts must start with ONE topic:
[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads