Mobile phone signal jammers and signal jammers are mainly used in various testing rooms, schools, prisons, public security, gas stations, theaters, hospitals, governments, churches, courts, libraries, conference rooms (centers), financial, military centers, etc. The use of mobile phones is prohibited. The cell phone jammer on the market can limit the mobile phone signal within 500M meters from the launching station, and the radius must not exceed 20 meters. The shielding radius is adjustable, which only shields mobile phone signals and does not affect other electronic devices. Power saving, the power is 20W-480w. When the mobile phone is working, within a certain frequency range, the mobile phone and the base station are connected by radio waves, and data and sound transmission are completed through a certain baud rate and modulation method. The mobile phone signal jammer for this communication principle scans from the low-end frequency of the forward channel to the high-end at a certain rate during the working process. The scanning rate may cause distortion interference to the message signal received by the mobile phone, and the mobile phone cannot detect the normal data sent from the base station, so the mobile phone cannot establish a connection with the base station. The mobile phone appears to search the network, there is no signal, no service system and other phenomena.
The common mobile phone signal jammers on the market currently operate at 869 to 894 MHz, 825 to 960 MHz, 1805 to 1880 MHz, and 1900 to 1990 MHz. The working frequency bands are CDMA800, GSM900, DCS1800 and PCS1900. The input voltage and 5V output voltage of the DC-DC converter can be used to control a range of about 40m in diameter.
Cell phone signal jammers are usually divided into test room phone signal jammers. Mobile phone signal jammer in the meeting room. Different configurations have been developed for different environmental requirements, including prison cell phone signal jammers. This is the best effect.