How does a cell phone signal blocker block cell phone signals?
The college entrance examination is one of the most important exams in the country every year. In fact, it is not only the college entrance examination, but no matter what kind of exam it is, fairness is the most important for every candidate. Therefore, preventing candidates from cheating in the examination room is the top priority of the examination staff. There are many ways to cheat. The most common way is to use various communication tools to cheat in the exam. In order to prevent this phenomenon, the cell phone signal blocker plays a vital role in the examination room.
I believe that during the two days of the college entrance examination, many friends will receive text messages from operators. The text message prompts that the cell phone signal blocker will be turned on during the exam according to the requirements of the Education Bureau. At that time, it will affect the communication quality of mobile phone users around the school. Until the end of the exam, the communication will return to normal. So the cell phone signal blocker is turned on in the examination room, and the mobile phone cannot communicate.
How does the cell phone signal blocker block the cell phone signal? It turns out that during the operation, the mobile phone signal jammer scans from the low frequency band of the forward channel to the high frequency band at a certain rate, and emits a white noise interference signal to interfere with the signal of the mobile phone receiving the message, so that the mobile phone cannot normally detect the data connection sent by the base station, and thus cannot establish a connection with the base station. The mobile phone presents no signal, limited service and other states.
At present, the mobile phone signal jammers used in the examination room are all full-band, including 2G-5G of the three operators, and include the 5G frequency of radio and television, as well as WiFi signals and Bluetooth signals. Some mobile phone signal jammers also include interference from VHF/UHF and other walkie-talkie signals, making it impossible for mobile phones and other cheating devices such as walkie-talkies to receive wireless signals normally. To a certain extent, it can effectively prevent candidates from cheating by using various cheating devices and maintain the fairness of the examination.
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