Mobile phone work, is in a certain frequency range, the cell phone and the base station through the radio waves, connected to a certain baud rate and modulation method to complete the data and sound transmission.
The commonly used mobile phone signal shielding, the frequency of the action is: 8690mhz and the function band is CDMA800, GSM900, DCS1800, PCS1900. It can control the range of about 40 meters in diameter, the input voltage is used and the 5V output voltage.
3G signal on the market, the current mobile phone signal shielding operating bands also from the previous four bands upgraded to five bands. On the basis of the previous four bands, more than 2100 to 2200 this band. For shielding and jamming 3G bands.
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