|
|
|
| Re: Cell Phone Scramblers [message #323345 is a reply to message #323344 ] |
Fri, 16 May 2008 08:31   |
 |
Henry Cohen
Messages: 697
Registered: January 2006
Location: Westchester Co., NY |
Has No Life |
|
|
| Steve Syfuhs wrote on Fri, 16 May 2008 09:17 |
I know next to nothing about RF...Is it that the basic premise is to produce noise on the offending frequencies? That way there would be nothing but interference?
|
No. There are generally two approaches to cell phone jamming: The first is to generate and transmit broadband RF energy at higher than base station (tower) downlink signal levels in the area of interest. Some systems will concentrate that energy on the control channels in the 800MHz services. (In the 1.8/1.9GHz PCS services, any channel can be a control channel.)
The other approach is to generate phantom control channels that tell the phone no voice channels are available so the phone won't dial out, and since the phone is locked to a fake control channel, it won't receive calls.
Henry Cohen
Production Radio Rentals
----------------------------------
"Every new [intentional] radio emitter since Marconi’s 2nd transmitter has caused interference to other systems!" - Michael Marcus, Oct '07
|
|
|
|
|
| Re: Cell Phone Scramblers [message #323401 is a reply to message #323396 ] |
Fri, 16 May 2008 11:01 |
 Steve Syfuhs
Messages: 109
Registered: March 2008
Location: Toronto |
Has No Life |
|
|
Oh I saw that. Doesn't prevent me from being interested in the technology though. General curiousity. Kinda like being interested in the fundamentals of atomic theory....doesn't mean I'm gonna build the bomb, haha.
An expert is one who knows more and more about less and less until they know absolutely everything about absolutely nothing.
http://www.doublenatural.com/blog/
|
|
|
Welcome to the ProSoundWeb sound reinforcement forums, home of more than 50,000 audio professionals. 
Forum Home
Login
Forum Search
Register
FAQ
