Mobile phone signal jammers have become standard equipment in the exam room. Not only the high school and college entrance examinations, but also postgraduate exams, civil service exams and various qualification certificate exams, mobile phone signal jammers are needed to prevent candidates from communicating with the outside world through wireless signals. In examination rooms that use mobile phone signal jammers, various mobile phone signals (2345G), wireless intercom signals, Bluetooth WiFi signals, etc. will be blocked by interference.
So let’s talk about cell phone signal jammers. Why can they interfere with your cell phone signal?
We can compare a mobile phone to a radio for the time being. The radio often churns or the channel is simply messed up and cannot be heard. This is the signal is disturbed. Since the radio can be disturbed, the mobile phone is the same. And interfere with some devices.
There are many different names for mobile cell phone jammer, such as jammer, mobile phone jammer, signal jammer, mobile phone signal jammer, mobile phone signal blocker, mobile phone isolator, mobile phone interceptor, mobile communication signal jammer, mobile phone signal Degree shielding device, mobile phone jammer, signal jammer, mobile phone blocker, signal blocker, mobile phone signal isolator, signal isolator, mobile phone signal interceptor, radio signal jammer.
For the uplink and downlink channels of the mobile phone system, it uses techniques such as frequency multiplication, frequency division, and frequency hopping filtering to analyze the required shielding frequency; customize a spherical shielding space according to the Power of the jammer, and automatically form an interference magnetic field within a specified range , So that mobile phones (including PHS-PHS GSM-China Unicom, China Mobile, CDMA-China Telecom) mobile phones in this space are invalid. When the jammer is in working condition, it can disable the signal receiving and sending function of the mobile phone within the specified range, and cannot dial out and dial in, so as to achieve the purpose of mandatory prohibition. The principle of radio communication: within a certain frequency range, mobile phones and base stations are connected by wireless electromagnetic waves, and data and sound transmission are completed with a certain baud rate and modulation method.