Common cell phone signal jammers currently on the market have functional frequencies: 869~894MHz; 825~960MHz; 1805~1880MHz and 1900~1990MHz, etc. The functional frequency bands are CDMA800, GSM900, DCS1800, and PCS1900. It can operate an area with a diameter of 40 meters, and uses a DC-DC converter to input working voltage and 5V output voltage. After the signal jammer is turned on, the mobile phone receives an error code in the packet signal, and the mobile phone cannot detect any normal data transmitted from the base station, making it impossible for the mobile phone to establish a connection with the base station. The main symptoms of mobile phones include search network, poor signal, and no service system. The functions of receiving and sending data signals by mobile phones within a certain range are invalid, and dial-outs and dial-ins cannot be made, thus achieving the purpose of forcibly prohibiting use.
Principles of mobile communication
The working principle of the signal jammer is as follows: within a certain working frequency area, the mobile phone and the base station are connected according to electromagnetic waves, and the data information and sound effects are transmitted with a certain serial port baud rate and deployment method.
Working principle of signal jammer
Based on the communication principle, the signal jammer passes from the mid- to low-end frequency of the frequency band to the high-end scanner at a certain rate during the operation process. This scanning rate may cause errors in the packet format signals received by the mobile phone. The mobile phone cannot detect any normal data transmitted from the base station, making it impossible for the mobile phone to establish a connection with the base station. The main symptoms of mobile phones include search network, poor signal, and no service system.
Basic elements of signal jammer
1. After the slow-start signal blocker is plugged in, the power supply rises from zero to stable within 4 seconds during operation.
2. After the blocking function is successfully activated, the mobile phones within the function range will be blocked within 35 seconds.
Application scope of signal jammer
Various examination venues, conference halls, gas stations, petrochemical plants, cathedrals, hospitals, courts, national defense sites, public libraries, cinemas and other venues.