What are the principles associated with the transmit frequency range of mobile phone signal jammers?
Effectively shields Docomo, Softbank, AU, eMobile, WILLCOM, 3G mobile phone signals, 4G mobile phone signals, 24GWIFi, 5.8GWIFI, UHF, VHF walky talkie signals and other mobile communication signals.
Wireless Communication Principle: Within a specific frequency range, mobile phones and base stations are connected by radio waves, and data and voice transmission is completed at a specific baud rate and modulation method.
Jammers, the communication principle of cell phone jammer, scan at a specific speed from the low-end frequency to the high-end of the forward channel during the work process. This scan speed can cause garbled interference in the message signal received by the mobile phone, and the mobile phone cannot detect normal data transmitted from the base station, so the mobile phone connects with the base station. Cannot be established. Mobile phones manifest themselves as search networks, no signals, no service systems, and other phenomena.
Frequency range:
(1) 869 ― 894 MHz
(2) 925 ― 960 MHz
(3) 1780 ― 1920 MHz
(4) 2010-2145 MHz
Shielded frequency band: CDMA800, GSM900, SCDMA1800, DCS1800, PHS1900, TD-SCDMA (mobile 3G), CDMA2000 (telecom 3G), WCDMA (unicom 3G)
Features of mobile phone signal shield:
1. It only shields the signal of the mobile phone and does not affect the normal operation of other electronic devices.
2. The examination room shields only the mobile phone signal and the radio fraud signal, does not interfere with the mobile phone outside the examination room, and does not interfere with the base station.
3. Shields only the downlink frequency of the transmit base station without affecting the uplink frequency.
4. Environmental protection and environmental protection, electromagnetic field strength is much lower than standard and does not affect the human body
5. GPS jammer operation is easy, the antenna is installed correctly, and the power supply can be operated automatically.
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