Mobile phone detector jammers affect signal transmission
The working principle of the mobile phone detector jammer used for the college entrance examination is to obliterate the useful electromagnetic wave signal in a large number of useless signals. Under normal circumstances, when we use a mobile phone, the mobile phone is first connected to the operator’s base station, and the radio wave signals sent by the two parties come and go. However, as soon as the signal jammer is turned on, it will "beat the gongs and drums" around the mobile phone, sending out "noise" radio wave signals that are many times larger than the received base station signal power. The mobile phone can't hear what the base station is talking about and cannot receive the base station normally. Signal, the connection between the two was severed. Whether calling, texting, or other various functions, they are all in a paralyzed state.
This is why mobile phone signal jammers affect the calls and Internet access of mobile phone users around the examination room. The working principle of the jammer is as follows: in a certain frequency range, the mobile phone and the base station are connected by radio waves, and the data and sound transmission is completed with a certain baud rate and modulation method. In view of the above communication principle, the mobile cell phone jammer scans from the low end frequency of the forward channel to the high end at a certain speed during the working process. This scanning speed can cause garbled interference in the message signal received by the mobile phone, and the mobile phone cannot detect the normal data sent from the base station, so that the mobile phone cannot establish a connection with the base station. The mobile phone is manifested as a search network, no signal, no service system and other phenomena. As a result, the mobile phone has no signal and cannot receive text messages or calls. Generally speaking, the frequency emitted by the mobile phone detector jammer interferes with the normal frequency of the mobile phone receiving the base station, making the mobile phone unable to connect to the base station, and thus unable to make calls, receive and send text messages and surf the Internet normally.
The current mobile phone jammers are all full frequency bands. It can shield all the 2G 3G 4G signals, 2.4G WIFI signals and Bluetooth signals under all the three operators of China Mobile, China Unicom and Telecom. Its principle is to use its own frequency. To interfere with the mobile phone receiving the frequency from the base station and wireless router, so as to achieve the purpose of shielding them.