When the mobile phone is working, it is within a certain frequency range. The mobile phone and the base station are connected by radio waves to complete the transmission of data and sound with a certain baud rate and modulation method.
The common mobile phone signal jammers on the market have the following frequencies: 869~894MHz; 925~960MHz; 1805~1880MHz and 1900~1990MHz, etc. The working frequency bands are CDMA800, GSM900, DCS1800, and PCS1900. It can control the range of about 40 meters in diameter, using DC-DC converter input voltage, 5V output voltage.
After the listing of 3G signals, the working frequency bands of mobile phone signal jammers on the market today have also been upgraded from the previous four frequency bands to five frequency bands. On the basis of the previous four frequency bands, the frequency band of 2100 to 2200 has been added. It is used for shielding and interfere with the 3G band.
