How to determine the shielding range of indoor mobile phone signal jammers? from dojammer's blog

Many customers often call and say: I need a new cell phone signal jammer that can shield a radius of 50 meters, a distance of 500 meters, and a radius of one kilometer, and it must be shielded by China Mobile, China Unicom, and China Telecom.

Is there anything wrong with the customer's requirements? No problem, and they also put forward specific distance requirements, but can it be achieved? The answer is: it is relatively difficult to achieve.

Why does this happen? Isn't the main parameter of the signal jammer marked with its own shielding distance? Can't it be achieved by placing more units according to this distance?

In fact, otherwise, the customer's requirements will be wrong, but they may not know that the shielding plan of the signal jammer is not a number. This forces us to understand the principle of the signal jammer:

During the operation, the signal jammer scans the low-end and high-end of the wireless channel at a certain speed. The scanning speed can cause error interference in the cell phone receiving the message format signal, causing the mobile phone to be unable to detect the normal microwave heating signal information sent from the communication base station, and inevitably prevent the mobile phone from establishing a connection with the communication base station within the overall plan, achieving the purpose of shielding the signal.

Simply put, the power emitted by the cell phone signal jammer interferes with the power of the mobile phone receiving the communication base station. After all, there is a competitive relationship between the jammer and the communication base station. If the signal strength of the signal jammer is lower than the wireless channel power transmitted by the communication base station to the mobile phone in the natural environment at that time, then the jammer cannot be shielded. Only when the output power of the signal jammer exceeds the output power transmitted by the communication base station to the mobile phone can it be effectively shielded. Therefore, any signal blocker will show different shielding distances when used in different signal environments, and it will be different for China Mobile, China Unicom and China Telecom, because the density of base stations built by these three operators, the direction of base stations and the power of base stations are unlikely to be the same.

In other words, how long the cell phone signal blocker can shield is not only related to its own signal strength, but also to the distance between base stations in the application environment (base stations are not limited to large-scale signal transmission towers built on the ground, but also signal expansion antennas on the roof and signal expansion and transmission in some buildings). Another important factor is the obstacle. If it is a metal material, it will be blocked directly; if it is a load-bearing wall of a concrete structure, it will attenuate by at least 10 times after passing through; if it is a wood board or glass material, the attenuation after passing through is relatively small.

Therefore, next time there is a customer who asks how long the shielding distance is, be sure to ask the distance between base stations in the environment, and then whether it is used indoors or outdoors, whether it needs to pass through the wall, etc. Customers can leave messages online to learn how to use the signal jammer. Only by understanding these can they choose the appropriate signal jammer.