The cell phone jammer is a shielding signal device that can effectively shield all communication signals such as CDMA, GSM, SCDMA, DCS (1800MHz), PCS (1900MHz), PHS, 3G, 4G mobile phone signals, WIFi and 5G mobile phone signals. The cell phone signal jammer can concurrently detect multi frequency bandwidth (GSM, DCS, CDMA, 3G，4G, 5G) transmission signals. Each band is designed with individual detection circuit for high sensitivity and consistency. Furthermore, if connected to a signal jammer (optional), it able to detect mobile phone signals and automatically activate the transmission block.
Introduction to the principle of cell phone signal jammers
The principle of mobile phone (radio communication) is as follows: within a certain frequency range, the mobile phone and the base station are connected by radio waves, and the transmission of data and sound is completed with a certain baud rate and modulation method.
According to the above communication principle, the cell phone jammers scan from the low-end frequency to the high-end of the forward channel at a certain speed during the working process. This scanning speed can form garbled code 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 shows phenomena such as searching the network, no signal, and no service system.
Why mobile phone jammers are legal, the main features:
- It only shields the signal of the mobile phone and does not affect the normal operation of other electronic devices.
- Only shield the mobile phone signal in the control room, no interference to mobile phones outside the control room, and will not interfere with the base station.
- Only shield the downlink frequency of the transmitting base station without affecting the uplink frequency.
- Green and environmentally friendly, the strength of the electromagnetic field is far lower than the national standard, and has no effect on the human body.
- The operation is simple, the antenna is installed correctly, and it can run automatically when the power is turned on.