>>
>> "Kathleen Carmody"
>wrote in
>> message news:Ma2dna19 snipped-for-privacy@skypoint.com...
>> >
>> > (-PLEASE- No lectures or legal suppositions needed or desired)
>> >
>> > Anyone know where to purchase a cellular phone jammer, preferably
>> > stateside. There are vendors off shore, but none here in CONUS
>> > that I know of. Please post here any US vendors that sell cellular
>> > jammers. (Extra points for relating your experience with using one.)
>> >
>>
>> yes indeed: google search for "copper mesh".
>>
>> simply surround the area you wish to sheild in the copper mesh
>screening
>> (solid copper will work too but its harder to breathe through)
>
>I've worked in a Faraday cage, so I know what you're saying is true.
>But what I can't figure out is why the elevator at work, which has four
>stainless steel walls, fails to stop my cell phone from working. Works
>great, other than the elevator ride is too short. ;-)
>
>Now here's something different. I work in the room with a half dozen
>old PBXes for our phone system, each having a lotta old TTL circuitry on
>big boards in a card cage. When I get near them, I can't get any signal
>thru to the cell phone. Works great when I don't wanna be bugged by the
>boss. ;-)
>
>
Unless the elevator doors close with RF gaskets, you have an open slot that is many wavelengths long. To be effective, a faraday cage should have no openings greater than about 1/10 wavelength at the highest shielded frequency.
Regards, Ed