At the beginning of the college entrance examination, many places strengthened the epidemic prevention in the examination room under the current complex epidemic situation to ensure the normal examination of examinees. At the same time, in order to ensure that cheating occurs in the examination room, the test site has also turned on the network jammer. Only after the end of the test will mobile communication resume as usual. So the question is, do you know what the function of the network jammer opened in the exam is?

As a communication device, all information is transmitted through electromagnetic waves. When communicating, you must first establish a connection with a nearby base station before you can achieve the purpose of communication. If you want to block the mobile phone signal in the examination room, it is impossible to disable the 2G-3G-4G-5G base station near the examination room. This will make all communication devices in a region unable to communicate normally. Then the only way is to block the mobile phone signal in the examination room. In fact, it is also very simple. As long as a network jammer shields the equipment, you can shield all mobile phone signals in the examination room.

Now the network jammers are basically full band, which can interfere with all 2G-3G-4G-5G bands of three operators, and can also shield wireless network signals and Bluetooth signals.

However, the frequency band ranges from several hertz to hundreds of kilohertz, and each band may be used as a communication signal. Will the examination room use some special frequency bands? This possibility cannot be ruled out. At this time, it is necessary to measure the frequency band of the site and use a specially customized network jammer. As long as the operating frequency band of these devices is within the frequency band covered by the network jammer, they can be shielded.