Different names for different mobile phone jammers
There are many different names for mobile phone signal jammers, 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 cell phone jammer, and automatically form a shielding magnetic field within the 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 radio waves, and data and sound transmission are 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.
Features of mobile phone signal jammer:
1. Only shield the downlink frequency of the transmitting base station without affecting the uplink frequency
2. Green and environmental protection, the electromagnetic field intensity is far lower than the standard, and has no effect on the human body
3. The operation is simple, the antenna is installed correctly, and it can run automatically when the power is turned on
4. It only shields the mobile phone signal and does not affect the normal operation of other electronic devices
5. 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
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)