The role of the GSM jammer
Why are there so many mobile phones out of school? Network problem, everybody's first reaction is to complain to the operator. Field survey found by the operator of the network, complaints area there is a high intensity of jamming signal, to the normal area mobile phone can't use the wireless network, also has been unable to make calls, send and receive text messages, to get to the Internet, etc. After the jammer is closed, the field network immediately returns to normal, and the data and voice business can be used normally. integration in communication signal transmitting and receiving antenna on the tower, the communication tower formed a net to cover the entire area, like a satellite navigation signal through the dome.
According to the professional, the mobile phone mask is at a certain speed to the low end of the channel to the high end of the scan. The speed of the scan can be used to generate random interference in the receiver's signal, so the phone cannot detect the normal data from the base station, and it cannot establish a connection with the base station.
In the management and use of the cell phone jammer, schools and students can explore together. For example, the shield doesn't have to be blocked 24 hours, it can be blocked at some time, and it can be synchronized with the power outage, allowing students to take a rest on time. It is not impossible to give students some free time to use their mobile phones. The role of the shield is to control the time of free association without completely cutting off the free communication channel.
Why can the wireless signal jammer interfere with the normal use of the phone? Mobile phones work by receiving and transmitting radio waves. The frequency of the phone is about 1.8GHz. To interfere with cell phone signals, you must have a device that emits the same frequency of radio waves. Cell phone signal jammer is such a device, it will block the mobile phone signal within the scope, the degree of light will seriously affect the call and the quality of the Internet. Generally within a radius of 25 meters, the phone will be strongly disturbed by the jammer. The effective range of 25 meters will also be affected less. The scope of the jammer will also change due to the specific performance and power of each jammer.
In excessive media today, developed communications network impact is not only the university classroom, such as meetings, reunion order of various social routine activities are affected by bow clan brush weibo 'letter. In the classroom, teachers and students should reach a consensus that the teaching order should not be destroyed, and it is obvious that students playing with mobile phones are illegal.
Jamming cell phone signals during class will undoubtedly bring good effect to teachers, students and classroom order. However, the school should make public the screening period, so that teachers and students can give a warning to friends and relatives in advance, so as to avoid other adverse consequences due to lack of contact in the event of emergency. Schools may also consider other ways of providing emergency access to teachers and students during the screening period for emergencies.
In Russia a lot of the examination room of the university, students through the way of receiving SMS illegally obtaining answers, or simply by taking textbook will answer his accomplices in the examination room the right hand side via their mobile phones to read to them. University teachers in Russia say the practice of simply telling students to turn off their phones or to frisk them before they enter the exam has not worked. As such problems become more serious, some of Russia's higher education institutions have had to turn to the high-tech equipment developed by the elite of the country's big military companies.