The mobile phone signal masker is mainly used for places where all kinds of examination rooms, schools, gas stations, churches, courts, libraries, conference centers (rooms), theaters, hospitals, government, finance, prisons, public security, and military sites are forbidden to use mobile phones. It is understood that the mobile phone signal jammer on the market can limit the mobile phone signal beyond the launch pad 500 meters away. The shielding radius is adjustable, and the coverage area is over 30m2. The cell phone signal shield can only shield the mobile phone signal without affecting other electronic devices. Save energy, power 12W - 480W.

 

Chinese name cell phone signal masker

Basic principles Mobile phone cannot establish connection with base station

Basic function Slow start function

Transmission power 1W±200mA

 

 

Basic Information 

When the mobile phone is working, it is within a certain frequency range, the mobile phone and the base station are connected through radio waves, and the data and the sound are transmitted with a certain baud rate and modulation.

Common mobile phone signal jammers on the market, their operating frequency is: 869~894MHz; 925~960MHz; 1805~1880MHz and

Various styles of signal jammers

Various styles of signal jammers (2 photos)

 1900~1990MHz and so on. The 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 launch of the 3G signal, the operating frequency band of the mobile phone signal jammer on the market today has also been upgraded from the previous four frequency bands to five frequency bands. On the basis of the previous four-frequency band, there are additional 2100 to 2200 bands. And interfere with the 3G band.

 

Fundamental 

The mobile phone jammer scans at a certain speed from the low-end frequency of the forward channel to the high-end during the work process. The scanning speed may form garbled interference in the mobile phone receiving message signal, and the mobile phone cannot detect the normal data sent from the base station, so that the mobile phone cannot establish connection with the base station. The mobile phone shows the search network, mobile phone no signal, no service system and other phenomena.

 

basic skills 

1 Slow start function

After the shield is energized, the operating power rises from zero to stable within 4 seconds.

2 shielding function

After the start is completed, within 35 seconds, the mobile phone within the scope of action is shielded.

 

Basic performance

Transmission frequency range: 860-960MHz 1.800-1.990GHz

Ambient temperature: -20~55°C

Relative humidity: 30%~95%

Frequency bands: CDMA800, GSM900, DCS1800, PCS1900, PHS.

Control range: 40 meters.

 

Instructions 

1. Select the area where you want to cut off the cell phone signal and place the cutter on the desktop or wall in this area.

2. After the installation is complete, turn on the power of the disconnector and turn on the power switch.

3. After the device is connected, press the power switch to work. At this point, all open mobile phones on the site are in a search network state and lose base station signals. Both the callee and the callee cannot establish a call.

Related Information Editing

The portable cell phone signal interceptor adopts imported IC, independent research and development, and is specially designed for small-scale venues with special security and confidentiality at home and abroad, such as confidential office, negotiation room, mobile vehicles, mobile politicians and business circles.

Portable cell phone signal blocker

Portable cell phone signal blocker

VIP guards on-site, etc., based on the actual situation of mobile communications at home and abroad carefully developed a successful high-tech products, it can cut off the GSM/CDMA/DCS/PHS/ within a radius of 0.5-15 meters (usually about 5-80 square meters) The PCS/3G mobile phone signal (enhancement can shield GPS signals) can make mobile phones in the area unable to make and receive calls and will not interfere with the work of other electronic devices in the environment. When the mobile phone is far away from the screen, it can be used normally.

The machine is easy to carry and concealed, small in size, light in weight, weighs only 150 grams; simple operation, low power consumption, only 0.5W/h, boot time up to 2-3 hours; convenient charging, most Nokia chargers are Can be universal; is a truly green handheld shield.

 

Development 

In view of the continuous development of the communication standard, the third successful development based on the actual situation of foreign mobile communications

Fifth-generation 5-channel 3G mobile phone signal jammer

Fifth-generation 5-channel 3G mobile phone signal jammer

On behalf of 3G mobile signal jammers. The difference between the masker and the ordinary mobile phone signal masker is that it can not only shield ordinary mobile phone signals but also completely cover the three frequency bands of the three mobile communication operators in China. The 3G bands used by China Mobile, China Mobile, China Unicom, and China Telecom are as follows: China Mobile 3G band (2010-2025MHz), China Telecom 3G band (2110-2125MHz), China Unicom 3G band (2130- 2145MHz). 5 antennas, 5 channel emission.

 

Scope of application

Mobile phone signal jammers, also known as: shield, cell phone screen, signal jammers, cell phone signal jammers, cell phone signal blockers, cell phone isolator, cell phone truncators, mobile communication signal masker, cell phone signal masker, cell phone interference , signal jammers, cell phone blockers, signal blockers, cell phone signal isolators, signal isolators, cell phone signal interceptors, radio signal shields.

Based on the uplink and downlink channels of the mobile phone system, it employs techniques such as frequency multiplication, crossover, and frequency hopping filtering to analyze the required shielding frequency; a spherical shielding space is customized according to the size of the shielding power, and a shielding magnetic field is automatically formed within a specified range. The mobile phone (including PHS-PHS GSM-China Unicom, China Mobile, CDMA-China Telecom) failed to use the handset in this space. When the masking device is in the working state, the function of sending and receiving signals of the mobile phone in a specified range can be invalidated, and cannot be dialed out and dialed in, thereby achieving the purpose of mandatory forbidding.

Can be applied to: all kinds of examination rooms, conference rooms, gas stations, oil depots, churches, hospitals, courts, military centers, libraries, theaters and other places.

However, in densely populated areas such as schools, it is forbidden to set up radio stations with excessive electromagnetic radiation, and cell phone signal jammers must not be used without permission.

 

Other related

Attached: mobile phone security risks

1. Domestic GSM and CDMA networks, due to European restrictions on our export encryption algorithms, have not opened the encryption function, the transmitted data is not encrypted;

2. The inherent loopholes in the security mechanism of GSM and CDMA - one-way identity authentication, that is, only the network identifies the mobile phone, and the mobile phone absolutely trusts the network, making it possible to impersonate as a legitimate user identity;

3. The radio waves emitted by the mobile phone can cross-modulate the electromagnetic wave information of the surrounding electronic devices and transmit them, resulting in leaks;

4. The mobile phone is an eavesdropper, and the mobile phone in the call state will send all the surrounding sounds to the receiver; even if the mobile phone is in the off state, as long as the battery is not removed, the surrounding sound can be used by a dedicated eavesdropping device. Obtain;

5. The main mobile phone technology and internal chips are imported. It is difficult to guarantee that there are no technology secret doors in these phones. These background technologies include the remote control of the mobile phone, the mobile phone to report the location without the display, dialing the phone not known to the user, or even recording the content of the call and sending it to a third party;

6. The United States has established an electronic monitoring network system covering the world. People use mobile phones to talk and almost go through its "filtering."