High Power Outdoor/Outdoor Waterproof Prison Jammer
Signal jammers have become standard equipment in exam rooms. For example, for high school and college entrance exams, 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). Avoid cheating in exams.
The working principle of the signal jammer is to analyze the required shielding frequency according to the uplink and downlink channels of the mobile phone system, using frequency multiplication, frequency division filtering and other technologies, and customize the spherical shielding space according to the power of the signal. Shielding device, and interferes with the frequency transmitted by the mobile phone. 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 a signal jammer is used in the test room, it is generally recommended to place one in each room. Such devices have relatively low power and do not require the use of waterproof and rainproof equipment. There is a difference between indoor and outdoor use of signal jammers. The first is the difference in operating distance. Generally, indoor cell phone signal jammers will consider the indoor layout and the size of the room that needs to be shielded.
Due to the wide range of outdoor cell phone signal jammers, the shielding distance can reach hundreds of meters. Generally, when the whole building needs to be shielded, jammers are used in outdoor buildings. Such large distances require the use of a signal with more than moderate power. The shield can reach the appropriate distance.
Therefore, for larger outdoor areas, high-power outdoor shielding devices are recommended. The casing is waterproof and rainproof. If the device is not waterproof, you need to install a waterproof rain cover. Therefore, the mobile phone jammer should be installed in a well-ventilated place, and try to install the antenna to avoid blocking by large objects, and the antenna needs to be shielded in the sun.
The shielding distance of the signal blocker has a certain relationship with the environmental conditions at that time, such as the distance of the base station, whether there is a signal amplifier around, etc. This factor should be fully considered when installing and using mobile phone signal jammers, so as not to cause dead corners of shielding, thereby affecting the shielding effect.