Busy Signal Cell Phone Blocked

Wissmann Kay 2022-03-01

In all kinds of examination rooms, schools, gas stations, churches, courts, libraries, conference centers (rooms), theaters, hospitals, governments, finance, prisons, public security, military areas, etc., we prohibit the use of mobile phones. In occasions, it is forbidden to use mobile phones, but in the above occasions, if you are not careful, the mobile phone will be turned on and brought in, so a technology is urgently needed to shield mobile phones without affecting the use of other electronic products, so Busy Signal Cell Phone Blocked came into being . In a certain frequency range, the mobile phone and the base station are connected by radio waves to complete the transmission of data and sound with a certain baud rate and modulation method. According to the above communication principle, the cell phone jammer scans from the low-end frequency of the forward channel to the high-end frequency at a certain speed during the working process. The scanning speed can cause garbled interference in the message signal received by the mobile phone, and the mobile phone cannot detect the normal data sent from the base station, so that the mobile phone cannot establish a connection with the base station. The mobile phone manifests as the phenomenon of searching the network, no signal, no service system, etc. Eventually, the mobile phone has no signal and cannot receive text messages and calls.

Through the analysis of PRB data extracted in the background, the waveform of Shitoushan Industrial Park West-LHHN-132 with the strongest interference value was raised as a whole and greater than -105, which was initially determined to be external interference. On-site interference sweep frequency investigation. Through the frequency sweeping investigation near the Stone Mountain Industrial Park, when entering the area of ​​the DMV for frequency sweeping, the noise floor is obviously raised. It is initially determined that the interference caused by the mobile phone jammer installed in the DMV. After communicating with the staff of the DMV, it is found that After the 20th, the DMV test will be opened Busy Signal Cell Phone Blocked , the same time as the interference. If there is a large area of ​​high interference, first check the parameters in the background to see if the frame is out of sync or the GPS is faulty. If there is none, then perform a frequency sweep test in the interference area. In order to improve work efficiency, we give priority to the frequency sweep inspection of the vehicle management offices, school small loan, second-hand car trading market, and factory warehouse in the interference area.