The working principle of mobile communication is that within a certain frequency range, wireless devices (mobile phones, etc.) and base stations communicate through radio waves, and complete data and sound transmission with a certain baud rate and modulation method. Once there is a need for a call, the mobile phone will be allocated to the mobile phone service channel according to the specific conditions of the nearby channel of the terminal, and the mobile phone will be redirected to the service channel to complete the call and call. data transmission.

According to the above task principle, the mobile phone wifi blocker is generally composed of a power supply, an electronic scanning control unit, a segmented radio frequency module unit, an amplifier unit and a transmitting antenna unit. it passes through the inverter, enters the oscillator to be modulated to the mobile communication working frequency band, and then is reduced by the power amplifier, and the voltage regulator tube controls the power. The reduced frequency sweep signal is transmitted into the air as radio waves. Since the frequency sweep signal causes garbled interference in the audio signal received by the mobile phone (increasing the ratio of the noise signal to the device threshold), the mobile phone cannot receive the normal data sent by the base station, resulting in the mobile phone being unable to establish a normal connection with the base station, thus causing the mobile phone to Disconnect. Base station communication network. The mobile phone shows that the search network has no signal, no labor system, etc., to achieve the shielding effect.

The interference power of the mobile phone jammer is fixed, and the shielding radius of the hysteresis space is determined by the path attenuation and the signal level of the receiving base station. In order to complete the interference of mobile phone signal jammers to mobile networks, it is necessary to ensure that the signal field strength emitted by the jammer is stronger than the field strength of mobile signals in the interference area. The closer the jamming position is to the base station, the stronger the field strength and the smaller the invalid jamming area, and vice versa. , the farther the interference site is from the base station, the weaker the field strength and the larger the invalid interference area.

It can be seen that within a certain transmit power, the disturbance range depends on the field strength of the disturbance area. No matter how fierce the mobile phone jammer is, as long as the transmission power is constant, as the distance increases, the strength of the jamming signal will gradually attenuate, so as to obtain the ability to disturb. The cell phone signal jammer input channel power, base station signal level, and mask line gain can determine the actual mask radius with reference values.