Mobile phone jammers have become standard equipment in the exam room. For example, high school and college entrance examinations, postgraduate exams, civil service exams, and various qualification certificate exams, signal jammers will be used to prevent candidates from contacting the outside world through wireless signals (mobile phones). 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 mobile cell phone jammer. The interference 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, thereby achieving 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 mobile phone signal jammers indoors and outdoors. First of all, there is a difference in operating distance. Generally, indoor mobile phone jammers consider the layout of the room 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 hundreds of meters. Generally, when the whole building needs to be shielded, mobile phone jammers will be used in outdoor buildings. Such a large distance area needs to use medium Power or above. Signal jammers can reach the proper distance.
Therefore, for large outdoor areas, it is recommended to use a Power outdoor mobile phone jammer. The shell is waterproof and rainproof. If the device 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 large-scale objects to block, and the antenna needs to be shielded when facing 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 blind spots and thus affecting the shielding effect.
