Cell Phone Jammers have become standard equipment in the examination room. Not only high school entrance exams but also graduate exams, civil service exams and various qualification certificate exams, mobile jammers are needed to prevent applicants from communicating with the outside world through of wireless signals. In the examination room using Dazhan Electronics wifi and cell phone jammer, various cell phone signals (2345G), wireless intercom signals, Bluetooth WiFi signals, etc. will be blocked by interference.
So let's talk about cell phone jammer, why can it interfere with your cell phone signal?
We can compare a cell phone to a radio at the moment. The radio spins often or the channel is just messy and cannot be heard. This means that the signal is disturbed. As the radio can be disturbed, the mobile phone is on and interfere with some devices.
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For uplink and downlink channels of mobile phone system, it uses techniques such as frequency multiplication, frequency division, and frequency hopping filtering to analyze the required shielding frequency; customize a spherical shielding space according to the power of the mobile phone jammer, and automatically form a shield within the specified range The magnetic field makes mobile phones mobile phones (including PHS-PHS GSM-China Unicom, China Mobile, CDMA-China Telecom) ineffective in this space. When the mobile phone jammer is in working condition, it can turn off the function of receiving and sending signal of the mobile phone within the specified range, and can not call and call, in order to achieve the purpose of 'mandatory ban.
The principle of radio communication: in a certain frequency range, mobile phones and base stations are connected by wireless electromagnetic waves, and the transmission of data and sound is supplemented by a certain transmission speed and method modulation.
The communication principle of wifi jammer and mobile cell phone, the jammer scans from low frequency from front channel to high end at a certain speed during the working process. This scanning speed may cause scrambled 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 the mobile phone cannot establish a connection. with the base station. The mobile phone manifests itself as a search network, no signal, no service system and other phenomena.