The principle of mobile phone signal jammer
Mobile phone signal jammers are mainly used in various examination rooms, schools, gas stations, churches, courts, libraries, conference centers (rooms), theaters, hospitals, governments, finance, prisons, public security, military areas and other places where the use of mobile phones is prohibited. It is understood that the cell phone signal jammers currently on the market can limit mobile phone signals that are 500M meters away from the transmitting station and have a radius of >20 meters. The shielding radius is adjustable, it only blocks mobile phone signals and does not affect other electronic devices. Save electricity, power is 20W--480w.
When a mobile phone works, it operates within a certain frequency range. The mobile phone and the base station are connected through radio waves to complete the transmission of data and sound at a certain baud rate and modulation method. In view of this communication principle, the mobile phone signal jammer scans from the low-end frequency of the forward channel to the high-end at a certain speed during the working process. This scanning speed can cause garbled interference in the message signals received by the mobile phone. The mobile phone cannot detect normal data sent from the base station, making it impossible for the mobile phone to establish a connection with the base station. Mobile phones show symptoms such as searching the network, no signal, and no service system.
Common signal jammers for sale on the market have operating frequencies: 869~894MHz; 825~960MHz; 1805~1880MHz and 1900~1990MHz, etc. The applicable frequency bands are CDMA800, GSM900, DCS1800, and PCS1900. It can control a range of about 40 meters in diameter, using a DC-DC converter input voltage and 5V output voltage.
basic skills:
1.Slow start function
After the shield is powered on, the working power rises from zero to stable within 4 seconds.
2.shielding function
After activation is completed, mobile phones within the range will be blocked within 35 seconds.
Basic performance:
Transmission frequency range: 860-960MHZ 1.800-1.990GHZ
Transmitting power: 1W±200mA
Ambient temperature: -20-+55℃
Relative humidity: 30-95%
Functional frequency bands: CDMA800, GSM900, DCS1800, PCS1900, PHS.
Control range: about 40 meters.
How to use mobile phone signal jammer
1. Select the area where you need to cut off the cell phone signal and place the cutter on the table or wall in this area.
2. After installation is complete, turn on the power to the disconnector and turn on the power switch.
3. After the equipment is connected, press the power switch disconnector to work. At this time, all powered mobile phones on site are in the search network state and lose the base station signal. Neither the calling party nor the called party can establish a call connection.
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