Jammers will improve the efficiency of student listening lessons
Now almost all students in the school have their own cell phones. To make matters worse, cell phones have become a "weapon" for many students against teachers. During the conference, most of the students used cell phones to surf the Internet. Many students tend to listen to music or play video games in class; it often happens that the phone suddenly rings when speaking in the classroom, which often causes a distraction. Worse yet, some students are using cell phones to help them cheat on exams. According to reports, a new phenomenon of "cyberbullying" refers to students who use text messages and social media to torture others electronically when they should be paying attention to lectures.
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The signal jammer overloads the mobile phone by sending signals at the same frequency and high enough power, so that the two signals collide and cancel each other out. The mobile phone is designed to increase the power when it encounters low level interference, so the jammer should recognize and match the increase in power of the mobile phone.
To jam the phone, all you need is a device that broadcasts on the correct frequency. Although different cellular systems treat signals differently, all mobile phone networks use radio signals that can be interrupted. GSM used in digital and PCS cellular systems operates in the 900 MHz and 1800 MHz frequency bands in Europe and Asia and in the 1900 MHz (sometimes referred to as 1.9 GHz) frequency band in the United States. The jammer can broadcast on any frequency and is effective for AMPS, CDMA, TDMA, GSM, PCS, DCS, iDEN and Nextel systems. Old-fashioned analog phones are just as susceptible to interference as today's digital devices.
A teacher told reporters that the school had installed 4G jammers in the dormitory. It is an act of internal management and it is a good thing. He said most of the time was now on smartphones and many students were in bed overnight and classes the next day were very lacking in spirit which would affect their learning. After installing the phone jammer, the students no longer sit and play with their phones, and the next day will be better.
Since the classroom is usually not very large, it is recommended to use a cell phone jammer, which is very convenient to carry and use - you can turn it on with the push of a button. Of course, you don't have to worry about emergency situations where someone needs to make a phone call, they can walk out of the classroom and make a call without disturbing others. You can also turn off the scrambling unit only when necessary.