What is the principle of Phone Signal Jammer?

Common shields are Phone Signal Jammer by transmitting interference signals. By transmitting a high -power signal of a certain frequency, the surrounding electromagnetic environment is severely damaged, and the mobile phone cannot obtain the signal from the base station normally, thereby achieving the purpose of blocking the mobile phone signal.

Under normal circumstances, when the mobile phone enters a honeycomb community for the first time, the local community base station will be updated and managed the mobile phone. To determine the location of your own area. When the mobile phone shielder works, it sends a interference signal. The interference signal is interfered on the valid signal on the base station broadcast channel frequency band. The interference signal increases the misunderstanding rate of the mobile communication channel, reduces the signal -to -noise ratio of the channel, and affects the mobile phone pair. The effective reception of base station broadcast information is when the signal -to -noise ratio is reduced to a certain extent. The mobile phone cannot be decoded normally on the radio information of the base station, which has lost contact with the base station. The mobile phone cannot determine the service area where it is located many times. Therefore, the mobile phone in the interference area is displayed as no signal and is not in the service area.