Cell phone signal blockers are used to effectively avoid and affect relevant signals on mobile phones. They are mainly used in campus examination rooms, cells, detention centers, etc. In order to ensure fair and reasonable examinations, junior high schools and high schools, and this year's college entrance examinations
Or a normal exam simulation. The function of the phone signal jammer is to affect the declining signal of the base station, thereby blocking the signal.
The principle of the signal jammer is to pass the low-end rate of the wireless channel to the high-end scanner at a certain rate during the working process. This scanner speed can produce a sense of error in the message format data signal received by the mobile phone.
Interference means that the mobile phone cannot detect any normal data transmitted from the base station, so that the mobile phone cannot establish a connection with the base station to achieve the purpose of screen malfunctioning signals. The mobile phone mainly displays network search and poor signal. , no service system status, etc.
The effect of a cell phone signal jammer is mainly determined by the power. If a device with the same power is connected to an external antenna and a built-in antenna, the screen effect is determined by the gain of the antenna.
The higher the power of the antenna, the stronger the shielding effect. Therefore, the quality of the signal jammer cannot be judged solely from the internal and external connections of the antenna.
What determines the reasonable shielding range of signal jammers?
The size of the output power of the signal jammer. When purchasing equipment, you must know the specific output power. For machines with small output power within 1W, the screen spacing is 1-10 meters long, and the use range of the screen is 10-10 meters. 30 m².
Density of surrounding base stations: Before purchasing equipment, you must understand the surrounding environment that affects the site, that is, whether there are base stations nearby. If there are base stations within 100 meters, you can use high-power ones appropriately.
It is not possible to buy a machine with a small output power because the receiving sensitivity of the communication base station is too strong.
How to use cell phone signal jammer?
After the mobile phone signal jammer is installed, it can be used after plugging it in and turning on the power switch. When the signal jammer is working, the mobile phone is searching for network status and loses signal connection with the base station.