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A low-power GPS jammer blocks call within 30 feet

  •   From the electronics point of view, a signal jammer is a very basic device. The simplest one is only a switch and an indicator light. More complex devices have switched to activate different frequencies of interference. Components of jammer include:

      Each interfering device has an antenna to send the signal. Some are contained in electrical cabinets. On stronger devices, the antenna is external to provide a longer range and can be tuned for a single frequency.

      Check your phone-if your phone battery is OK and if you want to continue your conversation, try to get out of the area. You may only need a few steps to get out of the Jammer's range.


      Interfering devices overload the cellular telephone by transmitting signals at the same frequency and at sufficiently high power so that the two signals collide and cancel each other out. The handset is designed to increase power when it encounters low-level interference, so the handset jammer must identify and match the power increase from the handset.

      Handsets are full-duplex devices, meaning they use two separate frequencies, one for calls and the other for simultaneous listening. Some jammers block only one frequency used by the phone, which blocks both frequencies. The phone was tricked into thinking there was no service because it could only receive one of the frequencies.

      While less sophisticated devices can block only one set of frequencies, sophisticated jammers can block multiple types of networks at the same time, preventing dual-mode or triple-mode phones from automatically switching between different types of networks, to find an open signal. Some high-end devices block all frequencies at once, while others can be tuned to specific frequencies.


      There are cell phones everywhere now. In October 2005, nearly 195 million people in the United States had cell phone service, according to the cellular telecommunications and Internet Association. Mobile phones are ubiquitous in Europe.

      The actual range of the jammer depends on its power and the local environment, which may include hills or walls of buildings that block interfering signals. A low-power GPS jammers blocks call within 30 feet (> 9 meters). Higher power devices create a cell-less area as large as a football field. Equipment used by law enforcement can shut down services within 1 mile (1.6 km) of the equipment.

      While most of us simply complain and move on, some are actually moving towards extreme retaliation. Cell phones are basically hand-held two-way radios. As with any radio, the signal may be interfered with or interfered with.

      Jamming cell phones is the same as jamming other types of radio communications. The mobile phone communicates with its service network through a cell tower or base station. Cell phone towers divide cities into small areas or cell phone towers. When a mobile phone user drives down a street, a signal travels from one cell tower to another.

      An interfering device transmits on the same radio frequency as the mobile phone, interfering with the communication between the mobile phone and the mobile phone base station in the tower.

      This is known as a denial of service attack. The cell phone jammer refuses to provide radio spectrum service to cellular telephone users within range of the jamming device.

      It's nice to be able to call anyone at any time


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