With the popularity of mobile phones, the demand for mobile phone signal jammers in various conferences, exams, etc. has also greatly increased, so mobile phone signal jammers naturally have a broad market. However, most users do not know enough about mobile phone signal jammers, and often choose high-power shielding unilaterally in order to achieve good results, resulting in many hidden dangers.
The principle of the mobile phone signal blockers is to transmit the interference signal through broadband to interfere with the uplink signal of the mobile phone, so as to shield the working signal of the mobile phone. So this is a signal transmitter in itself. As a signal transmitter, radiation is naturally generated. According to the needs of use, the current transmission power of signal jammers ranges from 1W to 480W. How much is this transmission power? In contrast, the maximum transmit power of a GSM mobile phone is 2W, and the maximum transmit power of a GSM macro base station is 20W to 40W. In addition, the shielded transmit power is generally between 10 and 60W for testing and conferences.
Generally speaking, for general exams and small meetings, choosing a cell phone signal isolater with a transmit power of 2W-10W can achieve good results. However, from the survey of major schools and important conference venues, many places unilaterally pursue high-power shielding. For example, there are more than 20 classrooms, each classroom has a shield, and choose 30W transmit power. After the inspection, due to the lack of attention to use, it often occurs that a small number of shields are not closed in time, and the launch continues for several weeks.
Therefore, pay attention when choosing to use a mobile phone signal jammer：
1. Don't blindly choose a high-power shield. In a classroom, choosing a shield with 2W transmit power is enough to achieve the shielding effect.
2. After use, the shield must be closed in time to avoid continuous radiation.
3. Be sure to choose a shielding device produced by a regular manufacturer.
The shielding device produced by an informal manufacturer often ignores its hidden dangers in order to pursue a good shielding effect. Some unscrupulous merchants use second-hand chips for recycling, or use substandard emitting devices to simply assemble and leave the factory to greatly increase the radiation, which directly and indirectly causes harm to our human body.