Now, with the development of information technology, mobile phones have become an indispensable part of people's lives and work. However, in some important examination occasions, mobile phones may become a tool for cheating, affecting the fairness of the examination. In order to effectively prevent this from happening, many exam centers use exam jammers to control mobile phone signals.          signal jammer

So, what is an exam blocker? The examination jammer is a mobile phone signal control equipment specially used in examination rooms. It can generate corresponding shielding signals according to different frequencies and formats, and cover the shielding signals to designated areas through antennas or distributed systems. In this way, when candidates use their mobile phones in the examination room, they will not be able to receive signals from external base stations and cannot make calls, text messages, or surf the Internet, thereby preventing cheating.

So, can the exam jammer block WiFi signals? The answer is yes. WiFi signal is a wireless LAN technology that uses the 2.4GHz or 5.8GHz frequency band to transmit data. The exam jammers currently on the market can support shielding signals in 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 block the WiFi signal in the examination room, making it impossible for candidates to cheat through the WiFi network.

So, how do exam jammers work? In fact, the working principle of the exam jammer is very simple, which is to use the interference principle to destroy the communication between the mobile phone and the base station. We know that data and sound are transmitted between mobile phones and base stations through radio waves. Radio waves are electromagnetic waves with a certain frequency and wavelength. When two or more radio waves with the same or similar frequency exist at the same time, interference occurs, causing the radio waves to be distorted or disappear.

Therefore, when the test jammer is turned on, it will generate radio waves of the same or similar frequency according to the uplink and downlink channels of the mobile phone system, and transmit them with higher power. In this way, a powerful interference magnetic field is formed in the examination room, making it impossible for mobile phones to receive normal data and sounds from the base station, and cannot send data and sounds to the base station.