Mobile phone signal jammers will be installed for important admissions exams, qualifying exams, and final exams, mainly to shield the electronic signals around the exam room to avoid cheating. So, how much area can the mobile phone signal blocker in the examination room block? Can only one shielding device be installed in an examination room to achieve shielding purpose?

The cell phone jammer in the examination room has a theoretical shielding range, which is about a radius of 0-20 meters. In fact, this is the theoretical distance. The actual effect needs to take into account the local signal strength, especially whether there is a signal base station installed around. If there is a signal base station within 200 meters, the shielding effect will be affected.

In addition to this, the thickness of the wall will also weaken the shielding effect of the shield. The shielding effect will be weaker because the signal is stronger near the window. Usually the standard classrooms of schools are about 75 square meters, so applying a shielding device to each classroom can obtain better shielding effect. It can be placed in the middle of the classroom for maximum shielding. Of course, the power wiring should also be considered. It is also quite common to place the shield at the podium.

For larger classrooms or when there are base stations around, then each classroom can be placed with two shielding devices, one on the front and one on the front, and the shielding signal will be superimposed and enhanced, so that a better shielding effect of 1+12 can be obtained. In addition, in order to ensure the shielding effect, another shielding device can be placed every 10-20 meters in the corridor of the teaching building.

Finally, it should be noted that the placement height of the shield is preferably 1.5-2 meters from the ground.