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source:Industry News release time:2021-08-11 Article author:sznbone Popular:Prison Jamming system
In China, signal jammers have become standard test room equipment in the examination room. For example, high school and college entrance examinations, postgraduate exams, civil service exams, and various qualification certificate exams, signal jammers are used to prevent candidates from passing wireless signals (mobile phones) Contact the outside world to prevent cheating in the examination room. How does the signal jammer interfere with the mobile phone signal and Internet signal? Let's first understand how it works.
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.
The signal jammer can shield the 2G/3G/4G/5G/WiFi signal of the mobile phone, so that the mobile phone cannot work normally, and can effectively prevent students from cheating using mobile phones and other electronic devices. It is precisely because of the excellent interference effect of the mobile phone signal jammer that it has become one of the necessary equipment in many examination places.
Both the country and the government are rigorously investigating cheating. The current cheating is not just the cheating method of cheating notes, but also the cheating method of searching for answers on the Internet and sending text messages to communicate with the outside world. For this kind of cheating The behavior may not be discovered in time. Therefore, it is reasonable to carry out detection through such equipment. The signal jammer is very convenient to use, it can be used when plugged in, and it can be turned off when not in use. This not only can effectively prevent cheating, but also does not affect the normal use of mobile phones after the exam.
Mobile phone signal jammers are mainly aimed at all kinds of places where the use of mobile phones is prohibited, such as various examination rooms, schools, gas stations, churches, courts, libraries, conference centers (rooms), theaters, hospitals, governments, finance, prisons, public security, and military centers. It is understood that the mobile phone signal jammers on the market can limit the mobile phone signals 500M meters away from the launching station. The shielding radius is adjustable, and the coverage area is more than 30 square meters. The mobile phone signal jammer can only shield the mobile phone signal without affecting other electronic devices.
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