Do Prisoners Have Cell Phones Achieve Signal Shielding

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. Do Prisoners Have Cell Phones 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.

Before the prisoner enters the prison, the items he carries will be strictly checked, but this does not ensure that the prisoner will not bring the electronic device into the prison through other means. Major consequences, now that the prison uses Do Prisoners Have Cell Phones , no matter whether the inmates can get the mobile phone through other means, they must stop the idea of ​​escaping and re-offending. Of course, many people think that the prisoners are not fools. Since they can send mobile phones into the prison from the outside world, they will naturally have a way to find and destroy the normal work of cell phone jammer , not to mention whether they can have a way to destroy it. , Even finding it is a bit difficult. There are some places in the prison that prisoners cannot enter. The preventive measures are very strict, and the materials brought by the prisoners when they enter the prison must be strictly inspected. Second, even if prisoners do find where the cell phone jammer is, how to break it and where the tools needed to break it come from is a question, and that's why it plays a major role in prison and the bottom line is to cut off the sentence The main reason for the idea of ​​people fleeing.