Examination signal jammers have been vigorously promoted and put into use. Examination signal jammers can be seen in the examination rooms of major schools. Why do more and more schools choose to install this kind of equipment? In fact, it will be popular only when there is demand. It is precisely because the problem of cheating has become more and more rampant in recent years, and the various cheating methods that have appeared frequently are frightening. In order to effectively curb the troubles of this kind of cheating, this A shielding device specially used in examination rooms turned out. Its appearance has greatly helped many examination rooms. More and more people have chosen it as a means to prevent electronic signal cheating.
This kind of test signal jammer is full-band. It can shield all the 2G 3G 4G signals, 2.4G WIFI signals and Bluetooth signals under all the three operators of China Mobile, China Unicom and Telecom. Its principle is sent by itself. The frequency interferes with the mobile phone receiving the frequency sent by the base station and the wireless router, so as to achieve the purpose of shielding them. Make people who are using mobile phones or some electronic products unable to receive and send any messages within this shielding range.
Only this kind of guarantee can ensure fair and stable order for candidates who are struggling in the examination room, and this kind of test signal jammer is very quiet when used, will not cause any noise, and also guarantees the needs of the examination room. Very quiet requirements, and at the same time, this shielding method will not cause any harm to the human body. Candidates can answer the paper in peace of mind. If you want to choose a professional test signal jammer, you must choose the right professional manufacturer.
The working principle of the cell phone jammer is that within a certain frequency range, the mobile phone and the base station are connected by radio waves, and the data and sound transmission is completed with a certain baud rate and modulation method. The jammer scans from the low end frequency of the forward channel to the high end at a certain speed during operation. This scanning speed can cause garbled interference in the message signal received by the mobile phone. The mobile phone cannot detect the normal data sent from the base station, so that the mobile phone cannot establish a connection with the base station, achieving the purpose of shielding the mobile phone signal. No service system and other phenomena. Generally speaking, the frequency emitted by the jammer interferes with the normal frequency of the mobile phone receiving the base station, making the mobile phone unable to connect with the base station, and thus unable to make calls, receive and send text messages, and surf the Internet normally.