16/11/12 Homemade Signal Jammer Information | eHow.com

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Homemade Cell Phone Signal Jammer How to Build a Simple SignalGenerator

Homemade Signal Jammer Information

Homemade signal jammers are used to

interfere with communication between a cell

phone tower and phones in its area so they

can not make or receive calls. The jammer

transmits signals along the same radio

frequencies as the phone transmission so

that they collide, denying service of the radio

spectrum. The practice of signal jamming is

legal in some countries but in others, like the

United States, it is not.

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By Mateo Zeske, eHow Contributor

Legality

The FCC outlawed the use of signal jammers, so information about how to make

a homemade version is not widely publishable. However, components of the

device and information on their function are available.

Antenna

Cell phone jammers need an antenna to transmit the offending signal. In smaller

products the antenna is an internal component, housed within an electrical

cabinet, while external antennas are used for longer range.

Electrical Components

The interference signal is generated by an oscillator. A tuning circuit channels the

required voltage to the oscillator, which sets the limits for the jammer broadcast's

frequency. The circuit also contains a noise generator that emits random

electronic output in the boundaries of the set frequency range. The output is

bolstered by RF amplification to make it high enough to jam the specific signal.

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References

FCC: Blocking and Jamming

Resources

Signal Jammer: Cell Phone Jammer News

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