In one's life, one will experience all kinds of examinations, including those in school, and the middle school and college entrance examinations. After entering the society, there are also various skills tests, civil service tests and so on. No matter what kind of test, fairness is the most important for each candidate, so it is the top priority of the examination staff to prevent candidates from cheating in the examination room. There are many ways to cheat. The most common way is to use various communication tools to cheat in the exam. In order to eliminate this phenomenon, the wireless interference instrument plays a vital role in the exam room.
It is believed that on the two days of the college entrance examination, many children will receive a message from the operator, in which the message prompts that the wireless interference device will be turned on according to the requirements of the Education Bureau during the examination, which will affect the communication quality of mobile phone users around the school, until the end of the examination, the communication will return to normal. So if the interference meter is turned on in the examination room, the mobile phone cannot communicate.
How does the wireless jammer interfere with mobile phone signals? It turns out that the jammer scans from the low frequency band of the forward channel to the high frequency at a certain rate during its operation, and transmits white noise interference signals to interfere with the signals received by the mobile phone, so that the mobile phone can not detect the data connection sent by the base station normally, thus unable to establish a connection with the base station, and the mobile phone presents a state of no signal and limited service.
At present, the wireless jammers used in the examination hall include 2G-5G of three operators, and include 5G frequency of radio and television, as well as Bluetooth signal of WiFi signal. Some jammers also include interference of VHF/UHF and other interphone signals, which makes mobile phones and other cheaters such as interphones unable to receive wireless signals normally. To a certain extent, it can effectively prevent candidates from cheating by using various kinds of cheating devices, and maintain the fairness of the test.
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