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Re: Cell Phone Scramblers [message #321433 is a reply to message #321202 ]

Sat, 10 May 2008 09:59

Iain Macdonald
Messages: 655
Registered: August 2005
Location: UK Europe

Has No Life

Hi,

Some people just reach breaking point when that phone rings at the wrong time. The issue in the second link is now a real legend in Theatre.

http://www.guardian.co.uk/world/2007/nov/29/usa.edpilkington

http://blogs.thestage.co.uk/shenton/2005/11/mobile-phone-rag e/

http://www.guardian.co.uk/world/2007/mar/06/theatrenews.mobi lephones

Iain.

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Re: Cell Phone Scramblers [message #321896 is a reply to message #321202 ]

Sun, 11 May 2008 22:55

Tim Duffin
Messages: 442
Registered: September 2004

Has No Life

Someone at my work once asked if I could engineer a multi-frequency RF jammer that was powerful enough to blow through any type of filtering in all types of recievers, even up to the GHZ range. I thought that a really good application would be to charge those lowballing AV companies an "RF usage fee" and if they did not pay up... Twisted Evil

www.spl-sound.com

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Re: Cell Phone Scramblers [message #323344 is a reply to message #321896 ]

Fri, 16 May 2008 08:17

Steve Syfuhs
Messages: 36
Registered: March 2008
Location: Toronto

Should Get Out More

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?

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

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Re: Cell Phone Scramblers [message #323345 is a reply to message #323344 ]

Fri, 16 May 2008 08:31

Henry Cohen
Messages: 644
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

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Re: Cell Phone Scramblers [message #323388 is a reply to message #323345 ]

Fri, 16 May 2008 10:40

Steve Syfuhs
Messages: 36
Registered: March 2008
Location: Toronto

Should Get Out More

Interesting...I'll have to look deeper into the designs, sounds very intruiging. I bet some mothers would love to have one in a house full of kids. Very Happy

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

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Re: Cell Phone Scramblers [message #323396 is a reply to message #323388 ]

Fri, 16 May 2008 10:52

John Roberts {JR}
Messages: 6401
Registered: April 2004
Location: MS

Has No Life

Steve Syfuhs wrote on Fri, 16 May 2008 10:40

Interesting...I'll have to look deeper into the designs, sounds very intruiging. I bet some mothers would love to have one in a house full of kids. Very Happy

Perhaps you missed the post stating it's illegal.

JR

https://www.resotune.com/

"A bus in a console is spelled with one 's', but you can buss your girlfriend while riding in a bus."

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Re: Cell Phone Scramblers [message #323401 is a reply to message #323396 ]

Fri, 16 May 2008 11:01

Steve Syfuhs
Messages: 36
Registered: March 2008
Location: Toronto

Should Get Out More

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

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