"Cell phones often have no signal and phone calls are intermittent! "" Using a cell phone to surf the Internet is very slow, and sometimes it can't connect at all! Recently, many citizens have complained that since June, when they use a mobile phone, there is often no internet, unable to make or make calls. Intermittent and unsuccessful sending and receiving of short messages, slow internet access, or even inability to access the internet. The reporter learned through interviews that it turned out to be the impact of the school jammer.
Interference with cell phone use
What's going on with these high power jammer? It is understood that each month of June is the exam season for the grandes écoles. Due to the college entrance examination, high school entrance examination, college entrance examination, final examination and various company exams, schools will frequently use communication jammers to prevent candidates from using communication equipment to cheat.
The jammer will not only affect nearby cell phone users, but also cell phones hundreds of meters away, and even those farther away will be affected. The jammer coverage will also change due to the specific performance and power of each jammer. Since the mobile phone and the base station are connected by radio waves of a specific frequency band, the interference signal directly affects the radio waves of the base station, thus affecting all communication users in the jurisdiction of the base station. During the exam, the school turned on the communication phone jammer, and residents in the area rated the internet speed as slow and the call was blocked. That's the reason.
Nowadays, communication jammers have been widely used in various large and small exams by many schools. However, in actual operation, there are problems such as notifying the user before the lack of obligation, insufficient accuracy of the signal shielding range of the jammer, and the communication jammer not being turned off in time. after the test, which affected the normal life and work of residents and nearby units.
For schools, communication jammers can only be used if the exam is at the national "secret" level or higher. If the event does not reach the national "secret" level, it cannot be used. It must be managed by a dedicated person during its use. In principle, it can only be installed indoors, and communication jammers cannot be used in non-secret places, and can only be activated and used half an hour before the start of the test, and closed when the test is complete.
In this regard, some citizens proposed that the relevant services establish a coordination mechanism for the use of test jammers, turn off wifi jammers in time after the examination and publish announcements around the test sites in advance and communities to make early warning work for everyone. Public. Aware, to deal with this.