Mobile phone signal jammers have become standard equipment in the examination room. Not only the high school and college entrance examinations, but also postgraduate exams, civil service exams and various qualification certificate exams, mobile phone signal jammers are needed to prevent candidates from communicating with the outside world through wireless signals. The current mobile phone 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 from the base station and wireless router, so as to achieve the purpose of shielding them.
The principle of the mobile phone signal jammer: within a certain frequency range, the mobile phone and the base station are connected by wireless electromagnetic waves, and the data and sound transmission is completed with a certain baud rate and modulation method. The communication principle of the mobile phone signal jammer, the jammer scans from the low end frequency of the forward channel to the high end at a certain speed during the working process. This scanning speed can cause garbled interference in the message signal received by the mobile phone, and 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. The mobile phone is manifested as a search network, no signal, no service system and other phenomena. Now that we know that the communication method of wireless communication is to communicate using electromagnetic waves. The functional characteristics of electromagnetic waves are determined by their frequency.
Our mobile phones must emit electromagnetic waves that meet the requirements in order to connect to our communication carrier base stations. Different communication systems use different frequencies so that everyone is safe and does not interfere with each other. The basic principle of mobile phone jamming equipment is to emit the same radio frequency signal as the mobile phone. Because the frequency is the same, the mobile phone cannot distinguish which signal is a regular base station signal, thus realizing "interference". As long as there is a machine with the same frequency as the phone, when the base station tries to connect to the phone, it will make a lot of "noise".
You will find that the signal from the phone is unrecognizable, so you will refuse to communicate with the phone. In the early days, jammer only blocked a set of frequencies, such as 2G, while complex jammers could simultaneously block several types of networks, such as 2-3-4-5G. So how is this kind of multi-network interference achieved? It's actually simple. In other words, repeat the interference bands corresponding to these three signals in a cyclical manner, and cover these three interference bands at the same time. The interval of this cycle is so small that the mobile phone has no chance to talk and can only sit down and do it quietly. A brick. Covers 2/3/4/5G, so what about Bluetooth and wifi? It doesn't matter, it can be done easily. Jammers have evolved again, adding Bluetooth and wifi frequency bands to the scanning range, so that several common communication methods in society are completely covered.
Many people don't understand the difference between the three methods of Bluetooth, Wi-Fi and mobile data. They seem to be wireless communication technologies. In fact, the main difference between them lies in the frequency band. In mobile communication technology, 2G mainly works in the 900-1700MHz frequency band, 3G works in the 1900-2100MHz frequency band, 4G works in the 2300-2500MHz frequency band, and 5G works in the 3400-3600MHz frequency band. Bluetooth and WiFi work at 2.4GHz. In this way, the R&D engineers of Dazhan Electronics can accurately identify the communication frequency band and develop the mobile phone signal jammer of the same frequency band, so as to achieve the goal of completely shielding the mobile phone wireless signal.