Can the exam jammer block WiFi signals? Here is the answer
Now, with the development of information technology, mobile phones have become an indispensable part of people's lives and work. However, in some important exam occasions, mobile phones may become a tool for cheating, affecting the fairness of the exam. In order to effectively prevent this from happening, many exam halls will use exam signal jammers to control mobile phone signals.
So, what is an exam jammer? An exam jammer is a mobile phone signal control device specially used in exam halls. It can generate corresponding shielding signals according to different frequencies and formats, and cover the shielding signals to a designated area through an antenna or a distributed system. In this way, when candidates use their mobile phones in the exam hall, they will not receive signals from external base stations, and will not be able to make calls, send text messages, surf the Internet, etc., thereby preventing cheating.
So, can the exam jammer block WiFi signals? The answer is yes. WiFi signals are a wireless LAN technology that uses 2.4GHz or 5.8GHz frequency bands to transmit data. Now the exam jammers on the market can support shielding signals of multiple formats and frequency bands, including 2.4GHz and 5.8GHz WiFi signals. Therefore, when the test jammer is turned on, it can interfere with and shield the WiFi signal in the examination room, making it impossible for candidates to cheat through the WiFi network.
So, how does the test jammer for wifi work? In fact, the working principle of the test jammer is very simple, which is to use the interference principle to disrupt the communication between the mobile phone and the base station. We know that data and sound are transmitted between the mobile phone and the base station through radio waves. Radio waves are a kind of electromagnetic waves with a certain frequency and wavelength. When two or more radio waves with the same or similar frequencies exist at the same time, interference will occur, causing the radio waves to be distorted or disappear.
Therefore, when the test jammer is turned on, it will generate radio waves with the same or similar frequencies according to the uplink and downlink channels of the mobile phone system, and transmit them at a higher power. In this way, a strong interference magnetic field is formed in the examination room, so that the mobile phone cannot receive normal data and sound from the base station, nor can it send data and sound to the base station.
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