Although a cell phone is a wireless communication device that can be used anywhere, there are invisible wires dragging it, the cell phone base station. The first step in a cell phone call or phone call is to establish contact with a nearby cell tower. If you hold a mobile phone in your left and right hands, and use your left hand to dial a right-hand mobile phone, the electromagnetic wave of the mobile phone is not as simple as passing from the left hand to the right hand, but it will move from the left hand to the mobile base station hundreds of meters away, and then return to a big circle Return to the right hand (except for Bluetooth). Normally, the big brother of the base station and the little brother of the mobile phone are chatting in the heat, and the signals from the two radio stations are all coming and going, but when Cell Phone Blocker Schools Legal is on, it will "beat gongs and drums" around the mobile phone, sending more than the received base station signal Power many times the "noise" radio wave signal, the phone can't hear what the base station is saying, generally can't receive signals from the base station, the connection between the two is cut off, and the phone becomes an island, whether making calls, sending text messages or other When functioning, they are paralyzed.
This is a bad thing for communication, because so much noise comes out, not only "shielding" the signal of the test room, but also the radio signal around the test room will be interfered, seriously affecting the phone quality of mobile phone users around the test room. If the phone quality is poor, you will complain. So, once again, a warm reminder, for the flowers of the motherland, please be patient for three days. However, is this Cell Phone Blocker Schools Legal really useful? The entire frequency range of electromagnetic waves ranges from the smallest Hz to hundreds of GHz, and the range is very large. Every part can be used as a communication signal, but except for some very specialized equipment, the ordinary cell phone jammer is "not big enough", "not tones", and cell phone signal jammers can only block a small part of it. In the frequency band, communication tools can use the unshielded band to communicate. Of course, all 2G, 3G, and 4G mobile services of domestic communication companies are in several small frequency bands, and mobile phone jammers in the examination room can still be concentrated on these frequency bands. When working, cell phone jammers emit messy electromagnetic waves from low frequency to high frequency and interfere with the connection between the cell phone and the base station.
