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Cell Phone Jammers. A cell phone jammer is always used for blocking mobile signals in a specific area. The jammers were initially left for use by the defense sector for security purposes. In the recent past, the use of jammers have been extended to religious and workplace. The devices has also been used to ensure meeting runs smoothly without phone distraction by disallowing phone calls and messaging. The jammers works in the same principle that is used for blocking of radio waves. The jammers are differentiated based on size and the working radius. The larger the jammer, the larger the working radius range. A good jammer should also be able to interfere with both speaking and listening signals. A jammer operates using electrical power and has a switch button. It always has a light that lights whenever it is switched on. Majority of the small jammers relies on electrical energy from a battery while large jammers relies on electricity from plug in power sockets. Large jammers usually has an external antenna that is useful for sending and receiving signals. A voltage-controlled oscillator, tuning circuit, noise generator, and an RF amplification which perform specific tasks towards blocking mobile signal are the universal components of a cell phone jammer and they are meant to perform specific functions. The purpose of the voltage-controlled oscillator is to generate radio signals that will be enough to block the existing mobile signal whereas the tuning circuit regulates the frequency at which the jammer broadcasts its signal. The function of the noise generator is to generate random electrical output in a specified range to interfere with the mobile signals while the RF amplification is used to enhance the level of radio frequency so that it can block a mobile signal.
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The techniques that a cell phone jammer uses are similar to those of a radio jammer. The radio frequencies produced are always similar to the ones that the mobile phones operate on. The radio frequency generated will interfere with the ones connecting one cell phone to another. There are two broad categories in which the cell phone jammers can be grouped depending on the working principle. The first category is the one that block the radio frequency signals between cell phones and the jammers are always small. The other group is meant for large and powerful jammers. The large jammers usually target the radio frequency signals between the mobile phone tower and the satellite.
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The jammers are always available in different sizes and quality. Some of the common cell phone jammers include portable, remote control, adjustable, and school cell phone jammers. There are several other uses of cell phone jammers apart from the ones mentioned above.