1. High power suppression
Common jammers achieve mobile phone signal shielding by emitting interference signals. By emitting a high-power signal of a certain frequency, the surrounding electromagnetic environment is severely damaged, and the mobile phone cannot normally obtain and analyze the signal from the base station, thus achieving the purpose of blocking the mobile phone signal. signal jammer
Under normal circumstances, when a mobile phone enters a certain cell for the first time, the local cell base station will update the location of the mobile phone and assign it a new temporary mobile user identifier and other temporary user information. After the mobile phone receives the base station information, So as to determine the location of your community. When the mobile phone jammer is working, it emits an interference signal, which interferes with the effective signal on the base station broadcast channel frequency band. The interference signal increases the bit error rate of the mobile communication channel and reduces the signal-to-noise ratio of the channel, thereby affecting the mobile phone's Effective reception of base station broadcast information when the signal-to-noise ratio is reduced to a certain extent. The mobile phone cannot decode the broadcast information of the base station normally, and thus loses contact with the base station. The mobile phone cannot determine its service area after multiple attempts, so the mobile phone in the interference area shows no signal and is not in the service area.
2. Signaling-level intelligent shielding technology
Signaling-level intelligent shielding technology is also called pseudo base station mode. The device scans the public network signal by scanning the antenna, then blocks the public network base station signal through signaling-level instructions, simulates the public network base station signal and transmits a fake base station signal into the environment to induce the mobile phone, thus blocking the mobile phone signal. When this kind of jammer operates, it can force the user's mobile phone signal to be connected to the device, making it impossible to connect to the public mobile communication network.
Signal shielding applications
1. Primary and secondary school campuses
In many primary and secondary schools, the use of mobile phones is prohibited. With the development of society, more and more campuses have installed signal jammers. In class, students play with mobile phones and read novels very seriously, and the jammer will block the homework signal of the mobile phone. In addition, signal jammers will also be opened during major exams to prevent students from using electronic products such as mobile phones. Children may use mobile phones as a tool to cheat on exams. To prevent students from cheating on exams, mobile phone signal jammers are used in school exams.
2. Church
In churches in Western countries, the church is in a lofty position and should stop any uncivilized behavior. Ringing the bell will disturb others, which is uncivilized. Many churches therefore require a quiet atmosphere to preserve the Holy Spirit, so signal blockers are installed to block the signal if necessary.
3. Prison
Prisons are places where criminals gather, so they must be prevented from contacting the outside world. They must not be allowed to use mobile phones and other electronic devices to communicate with the outside world to prevent them from posing a security threat. The use of signal jammers can avoid this danger. . So to avoid secret contact between criminals and visitors, prisons install cell phone signal jammers.
4. Court
The court is a place that protects the rights and interests of the people and must ensure that the trial process proceeds smoothly without any external influence. As a solemn occasion, it cannot be disturbed by other electronic devices such as mobile phones. So cell phone signal jammers are installed in court to ensure seriousness.
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