1、 The principle of a shield

 

The mobile signal blocker scans from the low-end frequency of the forward channel to the high-end at a certain speed during operation. This scanning speed can cause garbled interference in the received message signals of the mobile phone, and the mobile phone cannot detect normal microwave signal data sent from the base station. Within a certain range, the mobile phone cannot establish a connection with the base station, achieving the purpose of disabling the use of the mobile phone. Mobile phones exhibit phenomena such as searching the internet, no signal, and no service system.
It targets the uplink and downlink channels of mobile phone systems, using techniques such as frequency doubling, division, and frequency hopping filtering to analyze the required shielding frequency; Customize a spherical shielding space based on the power of the shielding device, which automatically forms a shielding magnetic field within the specified range, causing the mobile phones (including PHS Xiaolingtong GSM China Unicom, China Mobile, CDMA China Telecom) to fail within this space. When the shield is in operation, it can disable the signal sending and receiving functions of mobile phones within the specified range, making it impossible to dial out or in, thereby achieving the purpose of mandatory disabling.

2、 Factors affecting the effectiveness of interference shields

 

Signal base station tower is a signal transmission tower built by mobile communication companies to enhance the signal strength of all mobile phones in the nearby environment and ensure the quality of mobile phone calls. It has a high power and a wide coverage area. If an analog signal shield is installed near the base station, the closer it is to the base station tower, the greater the interference and the weaker the shielding effect.

 

3、 Shield demand

1. Place of use: student classrooms and examination rooms.
2. Shielding area: X teaching buildings with X rooms on each floor, totaling X floors and X classrooms.
3. Shielding requirements: All 2G/3G/4G/5G mobile phone signals, as well as 2.4G wireless WIFI signals and Bluetooth signals from China Unicom, China Mobile, and China Telecom in the classroom building.

 

4、 Project Solution

Using our company's production A dedicated mobile signal blocker for exam rooms

① Install 10 signal shields on each floor and one in each classroom, totaling 70 devices.

② The shield is a built-in omnidirectional antenna with a shielding effect of 360 °. It is recommended to install it at a height of about 1-2 meters and hang it on a wall or table.

③ Installation direction: The built-in antenna signal shield needs to be installed vertically on the wall and cannot be hung upside down.; Check the power switch of the host, confirm that the power switch is in the off position, insert the output plug of the power transformer into the middle power socket on the left side of the host, and connect the input plug of the power transformer to the AC220V power supply.

④ Due to the interference of signal base station towers and signal amplifiers, it is necessary to increase the number of units installed in necessary locations.