Everyone was happy when the signal jammer appeared at first,In the beginning, the wifi jammer was not actually set up for the exam scene. The original application of signal jammers is actually prisons.
In order to ensure the information security and privacy of the prison's high-wall compound, it is necessary for the prison to isolate the communication signals between the prison and the prison. This is the original intention of the wifi blocker.
When the wifi signal jammer was first invented, the whole world was only in the 2G era. At that time, although there were three operators in China, all mobile phones used second-generation network communication technology. The communication frequencies of mobile phones used by manufacturers of different standards are quite different.
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 nearest communication base station, and the communication base station will command it when making and answering calls. In fact, it is all communication with the communication base station. So if the prison wants to interrupt the communication between prisoners inside the prison and the outside world, what needs to be done?
The answer is very simple. It only requires 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 too complex and unrecognizable, so it will refuse to communicate with the mobile phone.
Based on this principle, the wifi jammer device was initially developed and everyone was very happy. The prison only needs to be equipped with a few jammers that can emit such noise to block cell phone communication within the entire prison. And as there are more and more scenarios that need to block signals. The wifi signal jammer that was originally only designed to be used in prisons has gradually entered normal commercial scenarios, such as important meetings and exams.
Technical progress of wifi blocker
When communication technology developed in the 2G era, wifi frequency jammer could work perfectly. At that time, most operators used the same frequency band, and the frequency was relatively fixed, so it was relatively easy to interfere with it.
With the rapid development of communication technology. 3G and 4G communications were quickly applied to practical scenarios. At this time, the signal jammer encountered a dilemma, that is, the signal interference was originally designed only for 2G, because of the frequency, it could not cover the 3G and 4G signals. This also renders the masking ineffective.
In this case, the development of communication technology began to force the simultaneous development of shielding technology. In order to interfere with 3G and 4G signals, the jammer quickly evolved an interference function specifically for 3G and 4G frequency bands. So there is a problem that 2G, 3G and 4G all need to be shielded, so how? What about blocking all three frequency bands at the same time and space?
There are also Bluetooth and Wi-Fi, none of which can be missed
2G, 3G, and 4G are all covered. Can you breathe a sigh of relief at this time? The answer is no because there are also two ways of Bluetooth and WiFi that are not blocked.
Many people do not understand the difference between the three methods of Bluetooth, Wi-Fi, and mobile data. It seems that they are all wireless communication technologies. In fact, the difference between the three is mainly in the frequency band. In mobile communication technology, 2G mainly works in the 900-1700MHz band, 3G works in the 1900-2100MHz band, and 4G works in the 2300-2500MHz band. While Bluetooth and WiFi work at 2.4GHz.
That is to say, the aforementioned jammers that can block 2G, 3G and 4G cannot cover the frequency bands of Bluetooth and WiFi. So the jammer has evolved again. 2.4G is added to the range of interference to achieve interference and coverage of Wi-Fi and Bluetooth. So far, there are several wireless communication methods commonly used in human society. All have been completely covered. In the predictable frequency band, the signal jammer can better complete the task.