How to detect the effective blocking range of the mobile phone signal jammer in the examination room? from dojammer's blog

There are several ways to test the effectiveness of cell phone jammers in the examination room. Among them, the simplest and most effective method is to directly test the power, shielding range and other data of the signal jammer in the examination room through a spectrum analyzer. If you do not have professional electronic equipment, you can also use multiple mobile phones, walkie-talkies and other communication equipment with multiple frequency bands and different models to conduct field testing of mobile phone signal jammers in the examination room. This may be a method.

During the test, you can prepare mobile phones of multiple brands and using different operators. After powering on, hold the mobile phone from the position of the signal jammer in the examination room to detect the effective radius of the jammer in sequence from near to far. As the distance between the mobile phone and the mobile phone signal jammer in the examination room becomes farther and farther, it is necessary to check whether the mobile phone has a signal bar display, send messages, and make calls at regular intervals. When checking whether the mobile phone is blocked, it is necessary to make a call, because when you first turn on the signal jammers in the examination room, the signal display on the mobile phone may appear inaccurate, so you can try to make a call. If the call fails, the mobile phone will It is within the interference range, otherwise it means it has exceeded the shielding range. During the test, it is recommended to test the shielding distance of the mobile phone signal jammer in the examination room in multiple directions at the same time, and test whether a certain point is within the working range of the signal jammer in the examination room. Because the mobile phone should be held at that position for more than 1 minute before testing.

Compared with professional equipment, although the results tested through mobile phones have certain limitations, they are relatively easy to understand.