Examination room signal jammers must be familiar to everyone, because we will encounter them during the exam, so let us and Shan Jinuo to understand the scope of the exam room signal jammer, its functional characteristics and how to use it.
Examination room signal jammer range
1. jammer
Cell phone jammer is a signal shielding device that can effectively shield all communication signals such as CDMA, GSM, SCDMA, DCS (1800MHz), PCS (1900MHz), PHS, 3G mobile phone signals, WIFi and 4G mobile phone signals.
2. Introduction to the principle and shielding range
The principle of mobile phone (radio communication) 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-mentioned communication principle, the 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.
Shielding range: control the range of about 40 meters in diameter
3.functional characteristics and usage
Only shield the mobile phone signal, does not affect the normal operation of other electronic devices
Only shield mobile phone signals in the examination room, no interference to mobile phones outside the examination room, let alone the base station
Only shield the downlink frequency of the transmitting base station without affecting the uplink frequency
Green and environmentally friendly, the electromagnetic field intensity is far lower than the national standard, without any impact on the human body
The operation is simple, the antenna is installed correctly, and it can run automatically after power on
Instructions
1. Select the area where the mobile phone signal needs to be cut off, and place the cutter on the desk or wall in this area.
2. After the installation is complete, turn on the power of the disconnector and turn on the power switch.
3. After the equipment is connected, press the power switch and disconnector to work. At this time, all the mobile phones turned on at the scene are searching for the network, and the base station signal is lost. Both the caller and the caller cannot establish a call.