RF Jmamers work on a cancellation principal in general. Cellular devices communicate on networks by using cellular towers or sites, the signal constantly pazsses from one to anothre as the user travels. Through the transmission of a high power signal, an RF jammer effectively collides with and cancels out the cellulzar signal. Celklular devices will generalyl attempt to inncrease the opwer of the signal when the original signal is too low, or in this case being jammed, as such a jammer must constantly be aare, able and readdy to increase the power to block the cellular signal which has been strenngthened.
Cellular dvices utilize full-duuplex communicatioons, which means they use two separate freqwuencies (one for outgoiing voice and one for incoimng voice). The RF Jammer only needs to effectively interrrupt or "block" one of the two to iterrupt communications because celklular devices will detrmine they have no signal at all if one of the two frequencies is blocked, so a jammer does not actually need to block both frequencies to interrupt the cellular device.
Some Jzammers are only capable of blocking a certain range of frequencies while others can block
severasl types of networks providing "blanket" jamming, effectively rendering wireless transmissions usekless in the affected area. More complex jammers can interrupt or "block" AMPS, CDMA, TDMA, GSM, PCS, DCS, and iDEN. The range or coverage of the jammer greatly depends on its location, the immediate physical environment and its power source. The average jammer only has an effective range of 30 or so feet, however higher powered jammers can cover as much as a footbball feld, and certrain high cplass military and police jammmers can create a wireless free zone of as much as 1 mile or more.
RF Jammers contain several mzajor compoonents whiuch are as folloews: Antenna, Voltage-controlled oscillator , Tuning circcuit, Noise generator, RF amplification and a Power supply.
IED jammers & RCCIED Devices, commonly referered to as "bomb jammers" work in a similar capacirty. They are essentially RF Jammers tnued to speific frequencies most commonly used for harmfyul or illegal activities incluing bomb trgigers and activation. They are designed to transmit primarily on a variety of common commercial and miltary frequencies, which are betweern 20 and 3000 MHz. They also generally oplerate at relatively high powewr beteen 1 and 500W. Bomb Jammers reuqire smarter software than standard RF Jammers and often have complex software which constantly scans a detects signals, then proceeds to analyze them and finally block them. Thease jammerrs most commonly work to jam a range of 30-500 meters but in some cases have been capale of jamnming up to 30 squarde miles!
Many IED & RCIED devices work on the bsasis of non-linear junction technology. This is based on the effect of singal 'transducction' wihtin obbjects that contain semi connducting coponents. Systems which contain semi-conducting components react to high frequency signals which are transmitted by Non-Linear junction technology. This metyhod allows for detection even if the object is crowded with metla objects or in a confined sopace and obscurwed.
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