In order to prohibit students from using mobile phones, a private middle school in Zhengding County installed a number of Cell Phone Jammer Under 100 on the roof of the teaching building. Now the students can’t use mobile phones, but because the equipment is located on the roof and the surrounding area is very empty, the surrounding residents are also seriously disturbed when using mobile phones. On March 25, the Radio Administration of Shijiazhuang, Hebei Province, in accordance with relevant regulations, ordered the school to dismantle the roof equipment. However, the school stated that the use of mobile phones has a very negative effect on the normal learning of students, and how to effectively supervise them has become a problem. According to an operator in Zhengding, for a long period of time, the company has frequently received reports from residents in the northeast area of Zhengding County that the mobile phone often appears intermittent when making calls. The company sent personnel to inspect the signal base station several times and found that there was no problem. Therefore, it sought help from the Shijiazhuang Radio Management Bureau to investigate the source of radio signal interference in the area. On March 25, the Shijiazhuang Radio Administration Bureau sent law enforcement officers and a radio monitoring vehicle to the northeast of Zhengding County to conduct inspections. After investigation, the staff initially detected that a private middle school in the northeastern area of the county seat had the strongest signal interference. When talking with residents around the school, the staff confirmed that the problem of mobile phones in this area is indeed serious, but the residents do not know the reason. cell phone jammer
The radio direction finding and positioning equipment showed that the source of interference was on the campus of this private middle school. After entering the campus, the staff found that all the buildings in this school are bungalows, and many of the teaching rooms are equipped with a yellow box-like device on the roof. Tests with professional instruments showed that the device had strong frequency radiation, and the mobile phone signals carried by the staff completely disappeared. The school admitted that the device was "Cell Phone Jammer Under 100", and the shield was turned on because the third grader was taking a mock exam that day. It is reported that the transmission frequency of this instrument has multiple frequency bands such as 800 MHz and 1800 MHz. These frequency bands include those used by communication operators. According to the school’s leaders, students use mobile phones to influence their studies. In order to achieve the purpose of prohibiting the use of mobile phones, the school has invested heavily in the purchase and installation of "mobile phone signal jammers", which are installed on the roof. "I didn't expect to have an impact on the lives of surrounding residents," the person in charge said. The instrument package clearly marked that the effective range is 30-50 meters. "How can the impact range be so large?" According to personnel, since the installation site is located on the roof and there is no building block around it, when the mobile phone jammer is turned on, the interference range will expand. According to reports, there are stricter regulations on the use of mobile phone signal shielding devices, and they can only be used in occasions such as major national examinations and high-level meetings. This private middle school also uses this kind of equipment in daily teaching, which has an impact on the normal life of surrounding residents. The Shijiazhuang Radio Administration Bureau ordered it to remove the mobile phone signal jammer in accordance with the law.