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
Joined: Wed Sep 21, 2005 3:40 am
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 Oscillator)
1650 – 2050 MHz
TL074 Quad Opamp
78L05 Voltage Regulator
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
Hamdard University Karachi,
Post subject: Posted: Thu Sep 22, 2005 9:35 am
Joined: Mon Jul 18,
2005 4:31 pm
Location: Baltimore, MD
Anybody else think that Naveed is now on the list?
Post subject: Posted: Thu Sep 22, 2005 11:49 am
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!!