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 call demand, it will be allocated to the mobile phone service channel according to the specific conditions of the channel near the terminal through the request, so that the mobile phone can jump to the service channel to realize the call and data transmission .
At the same time, 4G wireless communication must ensure sufficient signal-to-noise ratio to receive effectively and complete communication.
Then based on the above working principle, we can conclude that the 4G wireless signal jammer is generally composed of power supply, electronic scanning control unit, segmented radio frequency module unit, amplifier unit, transmitting antenna unit and other parts. The scanning signal generated by the signal generator passes 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 sweep signal is transmitted into the air in the form of radio waves.
The wireless signal jammer causes garbled interference in the message signal received by 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 a normal connection with the base station , So that the mobile phone is separated from the base station communication network. The mobile phone exhibits the phenomenon of no signal and no service system in the search network, which achieves the blocking effect.