The progress of science has benefited people's lives. Just like the coming 5G era, it will bring people a faster and better Internet experience, but bad news will also follow. For example, the signal is getting better and better, so those What about special places such as exams that need to be shielded from signals? Is there no future for full-band jammers?
1. The shielding of mobile phone signals From a technical point of view, it is only a small branch of the wireless information shielding system. When the downlink signal generates bit error and cannot be identified and connected to the network, the mobile phone shows that there is no network state, which meets the requirements of signal shielding.
2. For the full-band signal blocker, we all know that it will interfere with the downlink, but the mobile 4G and 5G do not distinguish between the uplink and the downlink. Due to the limitation of a series of factors such as cost, price, production, etc., it is difficult to only interfere with the downlink. Therefore, in order to improve the shielding effect, some unscrupulous people do not make accurate frequency scale adjustment, resulting in some interference energy for the uplink, which can indeed greatly improve the The scope of interference plays a positive role, but it dedicates itself to the public interest.
3. In the same room, the mobile phone signal may vary greatly at different locations and at different times. According to the actual experience, it can reach about 10dBm. In terms of conversion success rate, the difference is 10 times. It can be seen that mobile phone signal shielding is actually a project with high skill requirements, and it is not something that can be handled by simply purchasing a full-band shielding device and installing it on your own.
4. In special places, when signal shielding is required in a large-area cluttered environment, large-scale shielding with high-gain antennas combined with small-scale leaky indoor antenna compensation optimization methods should be used for shielding, the viewpoint of the antenna and the power of the full-band shielding device. Professionals are required for equipment and debugging. Short-term signal shielding in schools can use high-quality low-power full-band jammers or temporarily deploy antennas.
The selection of mobile phone signal jammers is mainly based on three dimensions: by the type of signal to be shielded, by power, and by appearance.
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First, the shielded signals can be divided into wireless signals emitted by China Mobile, China Unicom, China Telecom, radio and television base stations, Wi-Fi, etc. In addition, there are 2.4GWIFI, 5.8GWIFI, VHF, UHF and other frequency bands. This frequency band can be combined according to different needs, and can form different types of jammers. Therefore, first understand the signal you want to block. The normal shielded mobile phone signals are 2G, 3G, 4G, 5G and 2.4G, but at present, 5g mobile phone signal jammers that can shield 5g signals are already the mainstream of purchase.