Where is the vehicle-mounted frequency jammer? Today, let's trace the ins and outs of this artifact together.
In the beginning, the vehicle-mounted frequency cell phone jammer was not actually set up for the test scene. The original application is actually a prison.
In order to ensure the information security and privacy of the high-walled courtyard of the prison, it is necessary for the prison to isolate the communication signals between the prison and the prison. This is the original intention of the vehicle-mounted frequency jammer.
When the vehicle-mounted frequency jammer was first invented, the whole world had only developed into the 2G era. At that time, although there were three operators in China, in fact, the mobile phones used the second-generation network communication technology. The communication frequencies of mobile phones used by manufacturers of different standards are not bad.
The ability of mobile phones to make and receive calls mainly depends on the support of communication base stations. After the mobile phone is turned on, it will actively connect to the communication base station closest to him, and the communication base station will direct it when making and receiving calls. In fact, it is all communication with the communication base station. So if the prison wants to interrupt the communication between the prisoners inside the prison and the outside world, what should they do?
The answer is actually very simple. Just need a machine with the same frequency as the mobile phone to make noise, so that when the base station tries to connect to the mobile phone. You will find that the signal coming from the mobile phone is messy and unrecognizable, so you will refuse to communicate with the mobile phone.
Based on this principle, the vehicle-mounted frequency jammer was developed and everyone was happy. The prison only needs to be equipped with a few jammers that can emit such noise to interfere with the mobile phone communication within the prison. And as more and more scenes need to interfere with the signal. The vehicle-mounted frequency jammer, which was originally designed to be used in prisons, has gradually entered normal commercial scenarios, such as important meetings and exams.