Effectively shield CDMA (China Telecom), GSM (China Mobile, China Unicom), SCDMA (Netcom Da Lingtong), DCS (1800MHz), PCS (1900MHz), PHS (Telecom PHS), 3G mobile phone signal, 4G mobile phone signal, 24G WIFi , 5.8GWIFI, UHF, VHF walkie-talkie signals and other mobile communication signals
The principle of radio communication: within 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.
The communication principle of the mobile phone signal jammer, 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.
Transmission frequency range:
(1) 869 ― 894 MHz
(2) 925 ― 960 MHz
(3) 1780 ― 1920 MHz
(4) 2010 ― 2145 MHz
Shielded frequency bands: CDMA800, GSM900, SCDMA1800, DCS1800, PHS1900, TD-SCDMA (Mobile 3G), CDMA2000 (Telecom 3G), WCDMA (Unicom 3G)
Features of mobile phone signal shielding:
1. It only shields the mobile phone signal and does not affect the normal operation of other electronic devices
2. Only shield mobile phone signals and wireless cheating signals in the examination room, no interference to mobile phones outside the examination room, and no interference to the base station
3. Only shield the downlink frequency of the transmitting base station without affecting the uplink frequency
4. Green and environmental protection, the electromagnetic field intensity is far lower than the standard, and has no effect on the human body
5. The operation is simple, the antenna is installed correctly, and the power supply can be automatically operated