Mobile phone signal jammers are mainly aimed at all kinds of places where the use of mobile phones is prohibited, such as various examination rooms, schools, gas stations, churches, courts, libraries, conference centers (rooms), theaters, hospitals, governments, finance, prisons, public security, and military centers.
According to Xiaoyi's understanding, cell phone jammer on the market can limit the use of mobile phone signals and wifi signals with a radius of> 20 meters. As we all know, ordinary buildings do not add professional shielding facilities to wireless signals. This is a situation-the interference signal of the mobile phone signal jammer passes through the wall and is transmitted to the surrounding area. When the mobile phone is working, it is within a certain frequency range. The mobile phone and the base station are connected by radio waves, and the data and sound transmission are completed with a certain baud rate and modulation method. The presence of interference signals will cause garbled interference in the message signals received by the mobile phone. When the interference signal is strong, 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, and the mobile phone appears as a phenomenon such as searching the network, no signal, no service, or unavailable signal. When the interference signal is weak, the mobile phone appears to have a signal, but the Internet speed is slow, the call is unclear, intermittent, single-pass, etc.
Therefore, during the college entrance examination or large-scale social examination, users around the examination room may not use their mobile phones or even use them. This is the consequence of the school’s use of mobile phone shielding devices. Xiaoyi is also full of helplessness. It can be the first time to communicate with the test administration unit, and resume immediately after the test is over. Please forgive me!