The principle of the cell phone jammer is to implement electromagnetic interference to the wireless network on which the mobile phone communication depends, so that the mobile phone cannot access the network, so that it cannot receive information from the mobile network and send information through the network, but it has no effect on the signal generated by the mobile phone.
Greatjammer said that the principle of mobile phone (radio communication) is as follows: within a certain frequency range, the mobile phone and the base station are connected by radio waves, and data and sound are transmitted through a certain baud rate and modulation method. According to the above communication principle, the shield scans from the low end frequency of the forward channel to the high end at a certain speed during the working process. The scanning speed will cause random code interference to the information signal received by the mobile phone. The mobile phone cannot detect normal data from the base station, so the mobile phone cannot establish a connection with the base station. Mobile phones have the characteristics of searching the network, no signal, no service system, etc. Since any frequency band of mobile communication has multiple channels, each channel can be used as BCH, which channel in a small range can be used as BCH, so it is completely determined by the MSC according to the distribution of channels in the entire network area. Generally speaking, in order to prevent crosstalk caused by similar frequencies between channels, the frequencies between channels in the same cell should be very different. For example, after using channel 5, we should no longer use channel 4 or 6. The same channel and adjacent channels cannot be used in adjacent cells, and many messages are allocated in each cell. Among the channels, one channel is designated as BCH, and the other channel is designated as a traffic channel. Due to the uncertainty of the BCH, the uncertainty of the use of shielding, and the possibility of two or more BCHs in the adjacent area of the cell, when using signal shielding for interference, the mobile communication network that may appear in the area should be dealt with. Interference on all channels, that is, all frequency signals in the GSM, DCS, PHS, CDMA, SCDMA, WCDMA, TDS-CDMA frequency bands should be transmitted, so as to achieve interference to all mobile phone signals, and to realize the shielding of mobile phone signals as a whole , Cut off the link between the mobile phone and the base station.
The above is some basic knowledge of the principle of mobile phone signal jammer that Greatjammer brought to you. I hope to help you a little.