Generally speaking, the minimum range of signal jammers is tens of meters. As long as there are enough jammers, the maximum is unlimited. Otherwise, how can the prison achieve all signal shielding.
The range of the mobile phone signal jammer depends on the range of your FM, about one hundred square meters of house is enough, topsignaljammer has a variety of jammers, you can find out.
The shielding range of the mobile phone signal jammer is based on the power of the jammer. If it is tested in the field, the shielding range is different according to the strength of the local environmental signal. For example, the weak shielding range of the indoor signal is large, and there are GSM base stations for outdoor use accessories. Then the GSM signal is close to the outdoor shielding range!
Theoretical analysis shows that when the mobile phone signal jammer is working, if the transmission power is too large due to improper setting, in a small-scale conference room, classroom and other confined spaces, the electromagnetic waves are superimposed in the narrow space, and the electromagnetic waves will pass through the walls that are originally separated from the outside. The multiple reflections from the ceiling and the ground will cause the personnel in the room to be exposed to more serious electromagnetic pollution. According to the survey, the college entrance examination and the senior high school entrance examination are the occasions where mobile phone signal jammers are used the most. However, in some examination rooms that use mobile phone signal jammers, some parties (gaokao inspectors, candidates and teachers) are in a state of irritability and inability to concentrate. even headaches. There are various indications that if the transmission power of the mobile phone signal jammer is too large, it will seriously affect the normal thinking of candidates in the examination room.
When it is really necessary to use jammers, try to use low-power cell phone jammer. If one can solve the problem, do not set up multiple ones. The lower the installation position, the better. Do not hang it on top of people's heads, which is very detrimental to human health. The cell phone signal jammers we set up during the county economic work conference in the province were placed in the flowers on the floor beside the wall of the conference room, which not only achieved the shielding effect, but also did not affect the beauty of the venue. It can be said to be the best of both worlds.