The test room signal jammer will undoubtedly not be unfamiliar to everyone. We will encounter it during the exam, so let us take a look at the function characteristics of the test room signal jammer and how to operate it.
1. Introduction to basic principles and shielding range
The basic principle of radio communication: In the relative frequency range, the mobile phone and the communication base station are connected according to the radio wave, and the data and sound transmission are realized with the relative baud rate and modulation method.
Through the basic principles of communication just mentioned, the signal jammer scans from the low-end frequency of the forward channel to the high-end at a relative speed during operation. The scanning speed can cause error code interference in the message data signal received by the mobile phone, and the mobile phone cannot check the normal data sent from the communication base station, so that the mobile phone cannot establish a connection with the communication base station. The mobile phone is manifested as a search network, no signal, no service system and other phenomena.
Shielding range: control the range of about 40 meters in diameter
2. Functional characteristics and operation methods
It only shields mobile signals and does not interfere with the normal operation of other electronic devices
Only shield mobile signals in the examination room, no interference to mobile phones outside the examination room, and no interference to the communication base station
Only shield the downlink frequency of the transmitting communication base station without interfering with the uplink frequency
Low-carbon and environmentally friendly, the electromagnetic induction intensity is far lower than the industry standard, without any interference to the human body
The operation is simple, the antenna is installed correctly, and it can run automatically when the power is turned on
Method of operation
1. Select the area where the mobile signal needs to be disconnected, and place the cutter on the desktop or wall in this area.
2. After the installation is completed, turn on the disconnector and turn on the main power switch.
3. After the equipment is connected, press the main power switch disconnector to run. At this time, all the mobile phones turned on at the scene are in the state of searching the network, and the data signal of the communication base station is lost. Both the caller and the caller cannot establish a voice call contact.