An expert at City Mobility said a 20-watt Antenna Cell Phone Blocker can cover a radius of about two kilometers. If more than one is installed, the signal network in the area will be completely paralyzed. The problem Mr. Zhao encountered may be that in order to ensure the shielding effect of the mobile phone, the nearby test center installed more than one mobile phone jammer or high-power jammer. It is understood that cell phone jammer is a radio interference device, mainly transmitting radio signals of the same frequency in a local area to achieve the purpose of blocking the communication in the original frequency band.
In recent years, with the popularity of mobile phones, the use of mobile phone signal jammers has become more and more frequent. According to the data, there are thousands of mobile phone jammers used in the education system of our city alone, which are used for various examinations. Many exams and many other departments need Antenna Cell Phone Blocker to prevent communication equipment from contacting the outside world, which can better prevent cheating, so electronic devices that block signals are also emerging. How much do you know about blocking techniques?
