Cell Phone Jammers.
A cell phone jammer is always used for blocking mobile signals in a specific area. Initially, the jammers were only used for security reasons by the security department. In the recent past, the use of jammers have been extended to religious and workplace. Jammers have also been used curb phone distractions in meeting by disallowing phones calls and messaging. The jammers works in the same principle that is used for blocking of radio waves. The jammers are available in different sizes and operating range. If you want a large working radius then you should go for a big jammer. A jammer is considered to be of a good quality if it can block both speaking and listening signals.
A jammer operates using electrical power and has a switch button. To determine if it is functioning, the bulb should be on. Larger jammers are always connected to an output power source while the smaller ones can use batteries such as phone batteries. Large jammers usually has an external antenna that is useful for sending and receiving signals. A standard cell phone jammer is always made up of a voltage-controlled oscillator, tuning circuit, noise generator, and an RF amplification which are required to perform specific tasks.
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 RF amplification is to boost the power of radio frequency to amounts that can interfere with a signal while the noise generator is for generation of random electrical output to interfere with the existing mobile signals.
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A cell phone jammer works the same way as a radio jammer. It operates by producing radio frequencies similar to the ones that a mobile phone operates on. The radio frequency generated will interfere with the ones connecting one cell phone to another. The cell phone jammers available are grouped into two categories according to how they block the signals. The first category comprises of smaller jammers that block the radio frequency signal between an individual cell phone and the cell phone towers. The second group contains the 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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Several types of cell phone jammers exist that vary depending on quality and size. 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.