Now our mobile phone communicates with the base station through the uplink frequency and then transfers the signal to the mobile service switching center to realize the call. In the standby state, the mobile phone communicates with the base station through the broadcast control channel. Once there is a need for a call, the mobile phone will first be allocated to the mobile phone business channel according to the specific conditions of the channel near the terminal through the request, so that the mobile phone will jump to the business channel to realize the call and data transmission.
The principle of wifi signal jammer
At the same time, 4g wireless communication must ensure a sufficient signal-to-noise ratio to effectively receive and complete the communication.
Then according to the above working principle, we can conclude that the 4g wireless wifi jammer is generally composed of a power supply, electronic scanning control unit, segmented radio frequency module unit, amplifier unit, transmitting antenna unit, and other parts. After the signal generator generates the scanning signal, it goes through the inverter, enters the oscillator and modulates it to the mobile communication working frequency band, and then is amplified by the power amplifier and the voltage regulator tube controls the power. The amplified frequency scanning signal is transmitted into the air in the form of radio waves.
The wireless wifi signal jammer forms garbled interference in the received message signal of the mobile phone due to the frequency sweep signal (increase the ratio of the noise signal to the device threshold), the mobile phone cannot receive the normal 4G data sent by the base station so that the mobile phone cannot establish normal with the base station. connection, so that the mobile phone is disconnected from the base station communication network. The mobile phone shows the phenomenon that the search network has no signal, no service system, etc., so as to achieve the blocking effect.