Building mobile radio jammers depends on the receiving power of the pick-up station
The sampling signal generated by the signal generator passes through the inverter, enters the oscillator and modulates it to the working frequency band of mobile communications, 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. Because the frequency sweep signal corrupts the message signal received by the mobile phone (increasing the proportion of noise and noise signals to the device threshold), the mobile phone cannot receive the normal data sent from the base station, so the mobile phone cannot connect normally connect to the base station, resulting in the mobile phone disconnecting the base station communication network. The mobile phone shows the phenomenon of "no signal and no service system" in the search network, which achieves the blocking effect. The interference power of Cellular Jammer is fixed, and the shielding radius of the unblocked space is determined by the path attenuation and the signal level of the receiving base station. In order for the mobile phone network to be disrupted by the mobile phone signal jammer, it must be ensured that the signal field emitted by the jammer is stronger than the field strength of the mobile phone signal in the interference area. The closer the interference location is to the base station, the stronger the field strength and the smaller the effective interference area, and vice versa. , The further away the interference location is from the base station, the weaker the field strength and the larger the effective interference area. It can be seen that within a certain transmission power, the interference range depends on the field strength in the interference area. No matter how strong a cell phone jammer is, as long as the transmit power is a fixed value, the strength of the interfering signal will gradually weaken with distance. loss of interference ability. The table below shows the comparison table of distance and path loss. Then the cell phone jammer output channel power, base station signal level and coverage line gain can determine the theoretical coverage radius with reference value. Jammers In order to be able to react better to fraudulent activities during the university entrance exam, we installed a mobile phone shielding device during the university entrance exam.
Nowadays, as the number of cellular phones continues to increase, the quality of cellular phone signals is also declining. Many people know that installing mobile jammers can weaken the cell phone signal. How do I install a mobile signal jammer? What is the future development trend? With the advent of 5G, after the issuance of 5G licenses, industry development participants such as operators, machine and equipment manufacturers, and terminal manufacturers have expressed their “preparation”. In order to better meet the development trend of 5G, operators will invest a lot of money in building cellphone base stations, at the same time cellphone jammers have also been changed.
