cell phone jammer are banned in many areas in EU countries because they can severely disrupt local communications systems and even a large percentage of users are used for illegal purposes. For example, the cell phone jammer blocks all cell phone signals in a certain area. All telephone devices are in a state without a network or network search and users cannot carry out normal communication and communication, which can affect the call of the emergency telephone. Some thieves use a small GPS jammer that was bought online to steal the car, shield the car’s GPS system, and let the car lose its position, completely disappearing from the world.
It sounds like the term cell phone jammer is illegal, but not all cell phone jammers are used illegally. Everything has two sides, and the origin of jammers must be theoretically justified. In fact, most cell phone jamming devices are used for legitimate purposes. So what is the cell phone jammer, what is its use and specific application?
When the mobile phone works, the mobile phone and the base station are connected by radio waves in a certain frequency range, and the data and the sound are transmitted at a certain baud rate and a certain modulation mode, and the mobile phone jammer operates at a certain forward speed. The low-end frequency of the channel changes to the high-end frequency, which interferes with the signal reception of the mobile phone. The normal data sent from the base station is not recognized, so the mobile phone cannot connect. The base station mainly shows that the mobile phone has no signal, search network, no service and the like.
The cell phone jammer is mainly used to shield all mobile communication signals, for example the GSM 3G 4G signal network. Some high performance jammers can also block the GPS WIFI UHF VHF band. As soon as the device is in operation, all nearby mobile phones can no longer access the Internet. This keeps the environment calm while preventing information from being lost and stolen. At the same time, some cell phone jammers with GPS interference function can also prevent GPS location.
Possession of jammers is not prohibited. In special cases, it is permitted to operate cell phone jammers. For example, the use of jammer signaling devices in prisons can prevent criminals from communicating privately with the outside world, preventing other dangerous activities such as drug trafficking. Theaters and churches. The use of cellphone jammers can maintain the silence of the theater and the holiness of the church. Using jammers during school exams can prevent candidates from using high-tech tools to defraud and ensure the fairness of the exam.
The Canadian Department of Education plans to invest a lot of money in the Department of Education to buy jammers to prevent students from switching to mobile phones during school. The German prison authorities are planning to put a large number of jammers in the prison to prevent communication with the outside world. According to statistics, the German prison has searched almost 10,000 cell phones of prisoners every year. Although they have taken many measures, they have shown little effect.