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source:Industry News release time:2021-08-11 Article author:sznbone Popular:Prison Jamming system
Signal jammers have become standard equipment in the exam room. For example, for high school and college entrance examinations, postgraduate exams, civil service exams, and various qualification certificate exams, signal jammers are used to prevent candidates from communicating with the outside world through wireless signals (mobile phones). Put an end to cheating in the examination room.
The working principle of the signal jammer is based on the uplink and downlink channels of the mobile phone system, using techniques such as frequency multiplication and frequency division filtering to analyze the required shielding frequency, and customize a spherical shielding space according to the power of the shielding device, and interfere with the frequency emitted by itself The mobile phone receives the frequency sent by the base station and the wireless router, and automatically forms a shielding magnetic field within the specified range, so as to achieve the purpose of shielding the signal.
Generally speaking, if the signal jammer is used in the examination room, it is generally recommended to place one in each room. Such equipment has relatively low power and does not need to use waterproof and rainproof equipment. There is a difference between the use of signal jammers indoors and outdoors. First of all, there is a difference in operating distance. Generally, indoor mobile phone signal jammers consider the indoor layout and the size of the room that needs to be shielded.
Because of the wide range of outdoor mobile phone signal jammers, the shielding distance can reach several hundred meters. Generally, when the whole building needs to be shielded, the jammers are used in the outdoor buildings. Such large distances require the use of signals above medium power. The shield can reach the proper distance.
Therefore, for large outdoor areas, it is recommended to use a high-power outdoor shielding device. The shell is waterproof and rainproof. If the equipment is not waterproof, a waterproof rain cover needs to be installed. Therefore, the mobile phone jammer should be installed in a place with good ventilation, and the antenna should be installed as far as possible to avoid the shielding of large objects, and the antenna needs to be shielded in the sun.
The shielding distance of the signal jammer has a certain relationship with the environmental conditions at the time, such as the distance of the base station, and whether there are signal amplifiers around. This factor should be fully considered when installing and using mobile phone signal jammers, so as to avoid shielding dead angles and thus affecting the shielding effect.
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