Blocking Unavailable Calls On Cell Phone Makes The Phone Unable To Access The Internet Normally

Important admissions, qualifying or final exams require the installation of Blocking Unavailable Calls On Cell Phone to block electronic signals around the test room and prevent possible electronic cheating. So, how much area can the mobile phone signal blocker in the examination room block? Can only one shielding device be used in an examination room to achieve shielding purpose? How many jammers should a school building use? First of all, we need to know: the mobile phone signal jammer in the examination room has a theoretical shielding range, which is about a radius of 0-20 meters. But please note that this is a theoretical distance. The actual effect depends on the local signal strength, especially whether there is a signal base station nearby. If there is a signal base station within 200 meters, the shielding effect will be reduced. In addition, walls can also weaken the shielding effect of the shield. The shielding effect is also weakened due to the stronger signal near the window. The standard classrooms of schools are generally about 75 square meters, and each classroom can be equipped with a cell phone jammer to achieve better results. It can be placed in the middle of the classroom for maximum shielding. Of course, this should be determined in conjunction with the power wiring. It is also common to place shields at the podium. If it is a larger classroom or there is a base station nearby, you can place two jammers in each classroom, one in the front and one in the front, and a better effect of 1+1>2 will be achieved due to the enhanced superposition of the shielded signal.

Various methods of signal shielding In middle school physics, we have learned about metal shielding. Put the mobile phone in a closed iron box, and soon the mobile phone will enter a state of no service. Of course, this method is definitely not feasible. Make each test room into a metal-enclosed classroom Obviously impractical, so what other methods can be used to achieve signal shielding simply, quickly and efficiently? We can imagine such a scene: in a very noisy factory, A tries to talk to B, but the surrounding noise is too great, B can only see A's mouth, but does not know what A is saying. In terms of sound signals, this seems to be a good signal shielding method. So what about electromagnetic signals? The answer is yes. Blocking Unavailable Calls On Cell Phone During the working process, scan from the low frequency band to the high frequency band of the channel from the base station to the mobile phone at a certain speed, and receive messages on the mobile phone. In the process of signal transmission, interference is formed, so that the mobile phone cannot detect the normal data sent from the base station, and thus cannot establish a connection with the base station, showing a state of no signal and no service.