RF Jammers work on a cancellation principal in general. Cellular devices communicate on networks by using cellular towers or sites, the signal constantly passes from one to another as the user travels. Through the transmission of a high power signal, an RF jammer effectively collides with and cancels out the cellular signal. Cellular devices will generally attempt to increase the power of the signal when the original signal is too low, or in this case being jammed, as such a jammer must constantly be aware, able and ready to increase the power to block the cellular signal which has been strengthened. Cellular devices utilize full-duplex communications, which means they use two separate frequencies (one for outgoing voice and one for incoming voice). The RF Jammer only needs to effectively interrupt or "block" one of the two to interrupt communications because cellular devices will determine 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 Jammers are only capable of blocking a certain range of frequencies while others can block several types of networks providing "blanket" jamming, effectively rendering wireless transmissions useless 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 football field, and certain high class military and police jammers can create a wireless free zone of as much as 1 mile or more. RF Jammers contain several major components which are as follows: Antenna, Voltage-controlled oscillator , Tuning circuit, Noise generator, RF amplification and a Power supply. IED jammers & RCIED Devices, commonly referred to as "bomb jammers" work in a similar capacity. They are essentially RF Jammers tuned to specific frequencies most commonly used for harmful or illegal activities including bomb triggers and activation. They are designed to transmit primarily on a variety of common commercial and military frequencies, which are between 20 and 3000 MHz. They also generally operate at relatively high power between 1 and 500W. Bomb Jammers require 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. These jammers most commonly work to jam a range of 30-500 meters but in some cases have been capable of jamming up to 30 squared miles! Many IED & RCIED devices work on the basis of non-linear junction technology. This is based on the effect of signal 'transduction' within objects that contain semi conducting components. Systems which contain semi-conducting components react to high frequency signals which are transmitted by Non-Linear junction technology. This method allows for detection even if the object is crowded with metal objects or in a confined space and obscured.
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Learn the basic principals of how radio frequency jamming system (RF jammers) work.
Learn more about bomb jammers & convoy protection.
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