Because of the high maintenance needed to monitor and filter spammers from the RF Cafe Forums, I decided that it would
be best to just archive the pages to make all the good information posted in the past available for review. It is unfortunate
that the scumbags of the world ruin an otherwise useful venue for people wanting to exchanged useful ideas and views.
It seems that the more formal social media like Facebook pretty much dominate this kind of venue anymore anyway, so if
you would like to post something on RF Cafe's
page, please do.
Below are all of the forum threads, including all
the responses to the original posts.
Post subject: Cell Phone Jammer Circuit Design is so
simple Posted: Thu Sep 22, 2005 5:53 am
Wed Sep 21, 2005 3:40 am
I would like to explain the design of cell phone jammer.Cell phone
is actuelly a two way radio i:e we can send and receive signals of different
frequencies.The all you need to design is:
VCO (Voltage Controlled
1650 – 2050 MHz
TL074 Quad Opamp
9 Volt Power Supply
Here you will generate the radio
waves using VCO and apply that output signal to operational amplifier
to amplify that signal.A voltage regulator is used which controls the
operation of oscillator circuit and 9v power supply is used to operate
our final circuit.When the waves are generated and amplified,you will
need a small antenna which transmits these waves in the range of 60-80
meters.When any one enters in this range and he receives a call whose
frequency is inbetween 1650-2050 MHZ,our generated signal and origional
signal collide and cancle power of eachother. So no input is detected
by cellular. No service message is always there on that cellular.
NOTE:You can also block any FM radio but you need an oscillator which
generates waves in range of 88-108 MHZ.
Design It and Enjoy
Post subject: Posted: Thu Sep 22, 2005 9:35 am
Joined: Mon Jul 18, 2005 4:31 pm
Anybody else think that Naveed is now on the list?
Post subject: Posted: Thu Sep 22, 2005 11:49
But at what point do we soak our hands in acid?
Post subject: Posted: Thu Sep 22, 2005 12:35 pm
Joined: Wed Aug 20, 2003 11:47 am
Location: Santa Barbara, CA
Wow, I didn't know a TL074 opamp
could be used in the 1650-2050MHz band!! Thats one good opamp!!