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source:Industry News release time:2021-11-15 Article author:sznbone Popular:Prison Jamming system
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 send information online to cheat, affecting the fairness and justice of the test, the examination room will place a signal shielding device to shield the mobile phone signal, then how to realize the mobile phone signal shielding device used in the exam room What about? What principle is used?
The working principle of the signal 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 signal 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. As long as in the room where the shield is turned on, all China Mobile, China Unicom and Telecom phones cannot be used normally. To put it simply, the signal jammer blocks your signal and obliterates your useful electromagnetic wave signals in useless signals.
Phone thoughAlthough the wireless communication equipment 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, troops and confidential meeting rooms, etc. When mobile phone jammers are working, they will emit chaotic electromagnetic waves from low to high frequencies in various frequency bands. , Interfere with the connection between the mobile phone and the base station, to shield the mobile phone's Internet signal.
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