How does the wireless jammer interfere with the signal? Give some examples. As we usually see, the shielding instrument mainly shields the signals used by mobile phones by transmitting interference signals of various frequency bands. The wireless jammer transmits interference signals of various frequency bands, which severely damages the on-site environmental signals. The mobile phone cannot normally receive signals from the base station, so as to shield the mobile phone signals.

In general, when the mobile phone first arrives at a new location, the local BTS will update the location of the mobile phone and assign it temporary user information such as a new temporary mobile user ID. After receiving the BTS information, the mobile phone will determine its cell location. When the wireless jammer is working, it will send interference signals to interfere with the effective signals on the frequency band of the BTS broadcast channel. The interference signals improve the bit error rate of the mobile communication channel and reduce the signal-to-noise ratio of the channel, thus affecting the effective reception of the BTS broadcast information by the mobile phone. After a certain extent, the mobile phone cannot decode the broadcast information of the BTS normally, thus losing contact with the BTS. The mobile phone cannot determine its service area for many times, so the mobile phone in the interference area shows no signal and is not in the service area.

The second mode is pseudo base station mode. When some wireless jammers are running, the user's mobile phone signal can be forcibly connected to the device, which will result in that the mobile phone can no longer be connected to other mobile communication networks. Some new shielding devices use other principles to interfere with mobile phone signals, such as pilot signal interference method.