Every year during the college entrance examination, the school will have network problems such as mobile phone disconnection and slow Internet speed. That is because the school has opened a mobile phone jammer. How does the mobile phone jammer shield our mobile phones?
If we think of a mobile phone as a handheld two-way radio, the radio can be interfered, and mobile phones are no exception. Like any radio, the signal of a mobile phone will be interfered. The principle of interference, interfering with mobile phones is like interfering with any other type of radio communication.
The mobile phone communicates with its service network through the base station. When mobile phone users drive down the street, the signal is switched from one base station to another.
Different communication systems use different frequencies so that everyone is safe and does not interfere with each other. The basic principle of mobile cell phone jammer equipment is to transmit the same radio frequency signal as the mobile phone. Because the frequency is the same, the mobile phone cannot distinguish which signal is a regular base station signal, thus realizing "interference". As long as there is a machine with the same frequency as the phone, when the base station tries to connect to the phone, it will make a lot of "noise". You will find that the signal from the phone is unrecognizable, so you will refuse to communicate with the phone. In the early days, jammers only blocked a set of frequencies, such as 2G, while complex jammers could simultaneously block several types of networks, such as 2-3-4G. So how is this kind of multi-network interference achieved? Actually simple. That is to say, the interference bands corresponding to these three signals are repeated in a cyclic manner, and the three interference bands are covered at the same time. The interval of this cycle is so small that the mobile phone has no chance to talk and can only sit down.
Jammers have evolved again, adding Bluetooth and wifi frequency bands to the scanning range, so that several common communication methods in society are completely covered. Many people do not understand the difference between the three methods of Bluetooth, Wi-Fi and mobile data. It seems that they are wireless communication technologies. In fact, the main difference between them lies in the frequency band. In mobile communication technology, 2G mainly works in the 900-1700MHz frequency band, 3G works in the 1900-2100MHz frequency band, and 4G works in the 2300-2500MHz frequency band. Bluetooth and WiFi work at 2.4GHz. The role of jammers, which you don’t even know, was originally developed for law enforcement and the military to disrupt communications between criminals and terrorists.