Cell Phone Jammer Jail

In recent years, in order to ensure the fairness and impartiality of examinations, Cell Phone Jammer Jail and metal detectors have been widely used in various large-scale examinations, and the college entrance examination is naturally no exception. Most people believe that the combination of mobile phone jammers and metal detectors undoubtedly provides double insurance for the safety of the test environment. However, an unexpected experience in the work of proctoring the college entrance examination this year made the author feel that the scientific and reasonable use of mobile phone jammers and detectors is an important prerequisite for exam safety, otherwise it will bring unexpected consequences. The effective distance (30-40 meters) of the mobile phone signal jammer generally refers to the indoor distance. In an open outdoor area, the effective distance of shielding can reach several hundred meters. It should be pointed out that whether it is used indoors or outdoors, cell phone jammer The effective operating distance has a certain relationship with the environmental conditions at the time, such as the distance from the base station, and the location where it is placed. Therefore, when using mobile phone jammers, this factor should be fully considered to avoid shielding dead angles and thus affecting the shielding effect.

Technically speaking, the shielding of mobile phone signals is actually just a small branch in the wireless information shielding system. Its essence is electronic countermeasures, or co-channel interference, which uses equipment to send high-frequency signals through antennas to allow mobile phones to receive downlink signals. Error codes are sometimes generated and cannot be identified and connected to the network. The mobile phone shows no network status, which meets the signal shielding requirements; for Cell Phone Jammer Jail , everyone knows that it will interfere with the downlink, but it is difficult to do due to a series of constraints such as technical cost, price, and production. When it only interferes with the downlink, some unscrupulous manufacturers do not adjust the frequency range in order to improve the interference effect, resulting in some interference energy to the uplink. This can indeed greatly improve the interference capability and have the effect of correcting the right, but at the expense of the public interest;