Electronically speaking, cell-phone jammers are very basic devices. The simplest kind has just an on/off switch and a light to indicate it’s on. More complex devices have switches to activate jamming at different frequencies.  The main components of any jammer are its antenna, electronics, and power supply.

Antenna — Every jamming device has an antenna to send the signal. Some are contained within an electrical cabinet. On stronger devices, antennas are external to provide longer range and may be tuned for individual frequencies.

Electronics –The main electronic components of a jammer are:

• Voltage-controlled oscillator — Generates the radio signal that will interfere with the cell phone signal
• Tuning circuit — By sending a particular voltage to the oscillator, the tuning circuit controls the frequency at which the jammer broadcasts its signal
• Noise generator — This part of the tuning circuit produces random electronic output in a specified frequency range to jam the cell-phone network signal
• RF amplification (gain stage) — Boosts the power of the radio frequency output to high enough levels to jam a signal

Power supply — Smaller jamming devices are battery operated. Some look like a cell phone and use cell-phone batteries. Stronger devices can be plugged into a standard outlet or wired into a vehicle’s electrical system.
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This entry was posted on Wednesday, September 3rd, 2008 at 7:49 pm and is filed under Technical Info. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.