Mobile phone signal jammers are mainly aimed at all kinds of examination rooms, schools, gas stations, churches, courts, libraries, conference centers (rooms), theaters, hospitals, governments, finance, prisons, public security, military centers and other places where the use of mobile phones is prohibited.
It is understood that the mobile phone signal jammers on the market can limit the mobile phone signal beyond 500M meters from the transmitter and with a radius of >20 meters. The shielding radius is adjustable, it only shields the mobile phone signal without affecting other electronic devices. Save electricity, the power is 20W--480w.
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. According to this communication principle, the mobile phone signal jammer scans from the low-end frequency of the forward channel to the high-end frequency at a certain speed during the working process. The mobile phone manifests as the phenomenon of searching the network, no signal, no service system, etc.
The common mobile phone signal jammers on the market have the following frequencies: 869~894MHz; 825~960MHz; 1805~1880MHz and 1900~1990MHz, etc. The working frequency bands are CDMA800, GSM900, DCS1800, PCS1900, WCDMA, etc. It can control the range of about 40 meters in diameter, using DC-DC converter input voltage, 5V output voltage.
