This is an outdated project.
It is possible to build an AMPS cellular phone system jammer using commonly available parts. This will only work with the older, analog 800 MHz cellular phone system and is for reference only. The theory is to generate a signal that is in the same frequency band as the phone is operating in, but at a much higher power than the normal received phone signal. Sweeping that signal across the entire cellular phone band will jam any phone in the immediate area.
The most important part of the jammer is the initial RF signal source. Generating the RF signal is very easy today with an IC from
The next part of the jammer is the sweep generator circuit, this can surprisingly be built using (mostly) parts from
You'll also need to aquire an old bag-style cellular phone (Nokia/Tandy/Uniden are best) for it's power amplifier module, usually a PF0030. This will be the intermediate power amplifier and will drive the final power amplifier. There are a few possibilities in this stage and they will be described later.
Jamming distance depends on RF output power and antenna. Doesn't work on those PCS phones (yet!)
Can also be used to jam 800 MHz trunking and SMR radios (i.e. racist cops) and will do a little damage to the 900 MHz ISM band.
The third harmonic of a sweeping 800 - 828 MHz signal will jam devices operating in the 2.4 GHz ISM band. Great for taking out overzealous ISPs.