What is a jammer

Every exam season, all general institutions of higher learning and education departments in all districts should strengthen positive publicity, and do a good job in policy interpretation, voluntary reporting, information inquiry, warm reminders and other services. Strengthen the integrity education of candidates, focus on publicizing exam-related laws and regulations, and educate and guide candidates to consciously resist behaviors such as violations of discipline and fraud.

In order to ensure the information security of the examination room, some ordinary colleges and universities generally use signal jammers to interfere with external signals within a certain range. Today, Linchuang Technology will talk to you about how school mobile phone signal jammers interfere with mobile phone signals.

  1. How does the jammer interfere with the mobile phone signal?

To understand how the jammer interferes with the mobile phone signal, we must first know the working principle of mobile communication. Simply speaking, it is within a certain frequency range. The mobile phone and the base station are connected by radio waves, with a certain baud rate and modulation method. Complete the transmission of data and sound.

When the mobile phone communicates, it contacts the base station through the uplink frequency, and then transfers the signal to the MSC (Mobile Service Switching Center) to realize the call. In the standby state, the mobile phone communicates with the base station through the BCH broadcast control channel. Once there is a need for a call, it first asks the MSC through the BCH for instructions. implement the call.

  1. What is a jammer?

Let’s take a look at what a jammer is. Jammers are also known as cell phone signal blockers, cell phone signal blockers, and secrecy devices. Their working principle is to implement co-frequency electromagnetic interference on the wireless network on which mobile phone communication depends, so that the mobile network cannot communicate normally, so as to achieve the purpose of interference. The cell phone signal blocker only blocks cell phone signals and will not affect other electronic devices.

It should be noted that in order to interfere with the mobile network by the jammer, it must be ensured that the field strength of the signal sent by the jammer is far greater than the field strength of the mobile signal BCH in the interference area. The interference area is also smaller.

  1. National college entrance examination time in 2021

According to the website of the Ministry of Education, the 2021 National College Entrance Examination will be held on June 7, and the names of the subjects in each province (autonomous region and city) must be consistent with the national unified examination time schedule.

In order to ensure the fairness of the results, relevant departments can use mobile phone signal jammers. The examination room must strengthen disciplinary constraints, and specially set up chief examiners, invigilators, etc. to supervise the examination process, and prohibit any cheating. In addition, the mobile phone signal jammer is also suitable for the military, government agencies, prisons, gas stations and other places where the use of mobile communications is prohibited.