1. There is a bad signal, called the two days of the college entrance examination
As a heavy mobile phone user, the battery and signal of the mobile phone are life slots. If the battery is below 50% or the signal is not enough, you will feel unhappy and insecure. For such heavy mobile phone addicts, the most unhappy days of the year are the three days of the college entrance examination.
The college entrance examination is a regular program in June every year. In the short three days of the college entrance examination, apart from the uninterrupted news reports and the unprovoked crowding when passing the test center, the most impressive thing is that during the test period, due to the use of full-scale The mobile phone signal caused by the band signal jammer is poor.
What the heck is a full-band cell phone jammer ? Today, let's trace the ins and outs of this artifact together.
2. Everyone was happy when the full-band signal jammer appeared at first
In the beginning, the full-band jammer was not actually set up for the exam scene. The original application of the full-band signal jammer was actually a prison.
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 full-band signal jammer.
When the full-band 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 the 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 full-band signal jammer was originally developed and everyone was very happy. The prison only needs to be equipped with a few jammers that can emit such noise to block the cell phone communication within the entire prison. And as there are more and more scenarios that need to block signals. Originally designed for use only in prisons, full-band jammers have gradually entered normal commercial scenarios, such as important meetings and exams.
3. Technology is advancing by leaps and bounds, and full-band signal jammers are catching up
When communication technology developed to the 2G era, full-band jammers 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, 4G, and 5G communications were quickly applied to actual scenarios. At this time, the full-band signal jammer encountered a dilemma, that is, the signal interference originally designed only for 2G, because of the frequency, it could not cover the 3G and 4G signals. This also renders the mask ineffective.
In this case, the development of communication technology began to force the simultaneous development of shielding technology. In order to interfere with 3G, 4G, and G signals, the full-band jammer quickly evolved an interference function specifically for 3G, 4G, and 5G frequency bands. So there is a problem that 2G, 3G and 4G, 5G all need to be shielded, so how? What about blocking all three frequency bands at the same time and space?
The answer is very simple, that is, the interference bands corresponding to the three signals are repeatedly played in a loop to cover the three bands at one time, and the interval of this cycle is very small, so that the mobile phone has no chance to speak at all and can only sit down obediently.
4. There are also Bluetooth and Wi-Fi, none of which can be missed
2G, 3G, 4G, and 5G 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, 4G works in the 2300-2500MHz band, and 5G works in the 3400-3600MHz band. While Bluetooth and WiFi work at 2.4GHz.
That is to say, the full-band signal blocker that can block 2G, 3G, 4G, and 5G mentioned above cannot cover the frequency bands of Bluetooth and WiFi. Therefore, the full-band jammer has undergone another evolution. 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 full-band signal jammer can better complete the task.
Looking back on the entire development history of the full-band jammer, it is actually a history of information technology's attack and defense in the college entrance examination. The college entrance examination is a milestone on the road of life, and what we should do is to hold the correct beliefs and proper methods, and put an end to luck.
Friends who are familiar with the power consumption of batteries should be able to judge that if a battery is used to power 2000-3000W electrical equipment, the capacity of the battery must be very large. If we only calculate the power consumption of 2000W, if the output voltage of the battery is 24V and the high-power portable signal jammer needs to work continuously for 3 hours as a load, the capacity of the battery needs to reach 250Ah after power conversion to meet the requirements.
From the above analysis, it can be concluded that whether the continuous power supply of the high-power portable signal jammer can reach more than 3 hours depends on the capacity of its power supply battery. As long as the battery capacity meets the standard, the power supply time can be guaranteed. However, we should also understand that the larger the capacity of the battery, the larger its volume, and the weight of the battery will also increase proportionally. Even if the most commonly used lithium battery is used, it is conservatively estimated that the bare weight of a 250Ah battery will at least Reaching more than 50Kg, this will inevitably affect the portability of the signal jammer?