With the popularity of mobile phones, the demand for signal shielding for various conferences, exams, etc. has also increased significantly, so Raspberry Pi 3 Cell Phone Blocker naturally has a wide market. But the vast majority of customers lack sufficient understanding of cell phone signal jammers, and often choose high-power jammers one-sided for good results, causing many hidden dangers. The principle of the mobile phone signal jammer is to shield the mobile phone from working by interfering with the uplink signal of the mobile phone by transmitting the interference signal in the broadband. Therefore, it is a signal emission source in itself. Since it is a signal emission source, there is naturally radiation. The current cell phone jammer has a transmit power ranging from 1W-480W according to the needs of use. How strong is this transmit power? For comparison, the maximum transmit power of a GSM mobile phone is 2W, and the usual transmit power of a GSM macro base station is 20W- between 40W. The mobile phone jammers generally used for exams and conferences have a transmit power of 10W-60W.
Under normal circumstances, for general exams and small meetings, choosing a Raspberry Pi 3 Cell Phone Blocker of 2W-10W transmit power can achieve good results. But in our investigation of major schools and important meeting places, many places are often one-sided pursuit of high-power mobile phone signal jammers, such as: a school with more than 20 classrooms, each classroom is equipped with a mobile phone jammer, And the 30W transmission power is selected, and after the test, due to the lack of attention to the use, there is often a situation that a small number of mobile phone jammers are not turned off in time, and the transmission continues for several weeks. Especially in a primary school, after a certain exam, the cell phone jammer remained on for 2 weeks. It was not until we checked the scene that we found that the cell phone jammer was continuously turned on on the podium side of the classroom full of elementary school students. ! This really made us break a cold sweat!
