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Mobile Jammer Circuit Diagram - RF Cafe Forums

The original RF Cafe Forums were shut down in late 2012 due to maintenance issues. Original posts:

Amateur Radio | Antennas | Circuits & Components | Systems | Test & Measurement


SFACTOR
Post subject: Mobile Jammer
Unread postPosted: Sun Dec 19, 2004 11:15 am

Can anyone help me with circuit diagram of the GSM moile jammer around 900 MHZ?

Thx


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garylsmith2k
Post subject: Illegal Jammer
Unread postPosted: Sun Jan 02, 2005 4:07 pm
Offline
Captain

Joined: Sun Oct 31, 2004 3:01 pm
Posts: 5
Location: N/A
If you are insistent why not just add a noise diode to the GSM receive or transmit frequency oscillator with a HP PA following?

Not recommended, this is illegal in the US. Although it is legal in other countries.

If you are a software hacker you could just screw up the protocols for call handling.

FYI: Be aware that the US Government has a software backdoor into ALL cellphones, cable & DSL modems.

_________________
Cheers,
Gary Smith


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guest
Post subject:
Unread postPosted: Thu Feb 17, 2005 4:54 am

"FYI: Be aware that the US Government has a software backdoor into ALL cellphones, cable & DSL modems."

Gary..curious as to where your info comes from?


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garylsmith2k
Post subject: mobile jammer - security
Unread postPosted: Thu Feb 17, 2005 12:23 pm
Offline
Captain

Joined: Sun Oct 31, 2004 3:01 pm
Posts: 5
Location: N/A
Hi,

I got this info from a software engineer when we were both contracting for Ericsson. He was tasked with working on and wiriting security software for both the mobiles and CATV modems in the 1999-2000 ish time frame.

One could say he just made it up. He was very disturbed and shaken by the breach of First Amendment and those implications when he confided in me. Like most people needed to talk to somebody about it. I have not breached any confidence by passing this along rather the opposite. We both feel this is very slippery ground.

As a correlator you may remember that when digital cellular came out, law enforcement was screaming that they could no longer listen on drug dealers etc. Notice that the scteaming stopped about 5 years ago, when the comm companies caved into the Justice Department demands. A hardware solution is very expensive in equipment while a software solution is cheap.

Another correlator, since 911 the whole privacy notion has been tossed out in the name of national security. Remember the terrorist in that north african country who got blown up by a hellfire missile (cheers) when he got lax and used his cellphone?

While not eyes on, 100% proof, I knew the engineer who spoke to me about this very well. He had and still has my complete confidence.

I hope this gives you enough info to judge for yourself. Like most I think the idea of not saying anything via email you wouldn't want to see on a billboard is a good idea. While we all probably opposed toterrorists this is a very slippery slope to a country that has always taken the First Amendment very seriously.

My view is that the government types believe it is OK to listen as long as they don't broadcast what they hear.

Cheers,
Gary

_________________
Cheers,
Gary Smith


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Profile

ravi
Post subject: Re: Mobile Jammer
Unread postPosted: Thu Mar 03, 2005 1:25 am

SFACTOR wrote:
Can anyone help me with circuit diagram of the GSM moile jammer around 900 MHZ?

Thx


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malik
Post subject: Re: Mobile Jammer
Unread postPosted: Thu Mar 03, 2005 1:22 pm

SFACTOR wrote:
Can anyone help me with circuit diagram of the GSM moile jammer around 900 MHZ?

Thx
hi who r u my i d is ; arunmalik007 @yahoo.co.in
contact me, i m doing work on mobile jammer


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big john
Post subject:
Unread postPosted: Fri Mar 11, 2005 6:14 am

why not use a 555 chip to make white nosie then use a VCO to go between 950mhz-1ghz range and put a transmitter on it





Posted  11/12/2012

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