In large-scale examinations, such as the high school entrance examination, the college entrance examination, in order to prevent candidates from using mobile phones to transmit information and cheating, which affects the fairness and justice of the examination, the examination room will place a mobile cell phone jammer to shield the mobile phone signal, then how to realize the mobile phone signal jammer used in the exam room What about? What principle is used?
The working principle of the mobile phone jammer is to scan from the low-end frequency of the forward channel to the high-end at a certain speed during the working process. The scanning speed can cause garbled interference in the message signal received by the mobile phone. The mobile phone cannot detect the normal data sent from the base station, so that the mobile phone cannot establish a connection with the base station and achieve the purpose of shielding the mobile phone signal. No service system and other phenomena.
Generally speaking, the frequency emitted by the mobile phone jammer interferes with the normal frequency of the mobile phone receiving the base station, making the mobile phone unable to connect to the base station, making it impossible to make calls, receive and send text messages, and surf the Internet normally. As long as the mobile phone signal jammer is turned on in the room, all China Mobile, China Unicom and Telecom phones cannot be used normally. Simply put, the mobile phone jammer blocks your signal and obliterates your useful electromagnetic wave signals in useless signals.
Although a mobile phone is a wireless communication device that is used wherever it goes, there are also invisible wires dragging it, that is, the mobile phone base station. Whether making a phone call or answering a phone call, the first step is to establish contact with a nearby cell phone base station. At present, the mobile phone signal jammers used in the examination room are all full frequency bands, which can affect all the frequency bands of the three operators 2G/3G/4G/5G, and WIFI signals and Bluetooth signals can also be shielded.
Mobile phone signal jammers are mainly used in some school examination rooms, dormitories, detention centers, military units and confidential meeting rooms. When they work, mobile phone jammers will emit random electromagnetic waves from low to high frequencies in various frequency bands to interfere with mobile phones. The connection with the base station to shield the Internet signal of the mobile phone.
