On Thu, Mar 16, 2000 at 01:11:53PM -0800, James Newton wrote:
> I just heard from a guy that some restaurants in Japan have installed
> devices that block cell phone calls to prevent users from disturbing other
> patrons.
I've heard of this being done right here in the good ol' USA. Applications for
this that I've heard of is in court rooms (judges hate lawyer's cell phones
going off during court proceedings), *CHURCHES*, as well as resturaunts.

They way it was explained to me is that it is accomplished by sending a
signal in the cell phone frequency range strong enough to surpress the
AGC circuit in the cell phone so it never "sees" legitimate signals from
a cell. Basic RF jamming.

Supposedly the signal strength does not have to be very strong for this
to work.  It all seems over simplified to me, but I suppose in theory it
would work.


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Peter L. Berghold                        Peter@Berghold.Net
"Linux renders ships                     http://www.berghold.net
 NT renders ships useless...."