Copyright: 1996 - 2024
BSEE - KB3UON
RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling
2 MB. Its primary purpose was to provide me with ready access to commonly needed
formulas and reference material while performing my work as an RF system and circuit
design engineer. The World Wide Web (Internet) was largely an unknown entity at
the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps
while tying up your telephone line, and a nice lady's voice announced "You've Got
Mail" when a new message arrived...
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My Hobby Website:
Mobile Jammer Circuit Diagram - RF Cafe Forums
RF Cafe Forums closed its virtual doors in 2012 mainly due to other social media
platforms dominating public commenting venues. RF Cafe Forums began sometime around
August of 2003 and was quite well-attended for many years. By 2010, Facebook and
Twitter were overwhelmingly dominating online personal interaction, and RF Cafe
Forums activity dropped off precipitously. If the folks at
phpBB would release a version with integrated
sign-in from the major social media platforms, I would resurrect the RF Cafe Forums,
but until then it is probably not worth the effort. Regardless, there are still
lots of great posts in the archive that ware worth looking at.
Below are the old forum threads, including responses to the original posts.
|-- Amateur Radio
Gripes & Humor
-- CAE, CAD, &
Test & Measurement
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?
Post subject: Illegal Jammer
Sun Jan 02, 2005 4:07 pm
Joined: Sun Oct
31, 2004 3:01 pm
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.
Unread postPosted: Thu Feb 17, 2005 4:54 am
Be aware that the US Government has a software backdoor into ALL cellphones,
cable & DSL modems."
Gary..curious as to where your info
mobile jammer - security
Unread postPosted: Thu Feb 17, 2005 12:23
Joined: Sun Oct 31, 2004 3:01 pm
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
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.
Re: Mobile Jammer
Unread postPosted: Thu Mar 03, 2005 1:25 am
Can anyone help me with circuit diagram of the
GSM moile jammer around 900 MHZ?
Post subject: Re: Mobile Jammer
Thu Mar 03, 2005 1:22 pm
Can anyone help me
with circuit diagram of the GSM moile jammer around 900 MHZ?
hi who r u my i d is ; arunmalik007 @yahoo.co.in
i m doing work on mobile jammer
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