Precautions for installation of signal jammer!Wireless Network Signal Jammer devices

　　Precautions for installation of signal jammer

　　The development of modern communication technology by leaps and bounds requires technological security companies to keep pace with the times and continuously develop and strengthen their own strength to meet multiple challenges. The widespread popularity of mobile phones brings convenience to people, and at the same time raises new issues for communication security and confidentiality. Eavesdropping, leaks, cheating in examination rooms, medical accidents, and gas station explosions have emerged one after another, accelerating the mobile phone signal shielding device. The promotion and use of . It is mainly used in examination rooms, prisons, gas stations, mobile phone bomb prevention, oil depots, liquefied gas stations, detention centers, interrogation rooms, courts, labor reform teams, conference rooms, theaters, churches, libraries, school dormitories, special security and confidential occasions (Confidential offices, negotiation rooms, mobile vehicles, mobile politicians and business dignitaries guarding) scenes, etc., and the status of mobile phone signal jammers in social life is becoming more and more important.

　　In the cellular mobile communication system, the coverage area of the system is divided into several cellular areas. The base station of each cellular area is equipped with a low-power transmitter, and the transmitted signal is only received by the mobile phone within the limited range of the cellular. The transmitted signal is interfered by a certain intensity of electromagnetic waves of the same frequency, so the communication cannot be carried out normally. The mobile phone and the base station must first establish a normal dialogue before the mobile phone can communicate with the mobile phone or other phones, that is, normal communication.

　　Dialogues must have questions and answers. If we can cut off what the speaker is saying or prevent the listener from hearing what the speaker is saying, we can block their normal communication. It is not advisable to cut off what the speaker says is to interfere with the uplink signal of the base station. Therefore, we can only prevent the listener from hearing what the speaker is saying, and our goal can be achieved. That is, it interferes with the downlink signal of the base station. The strength of the downlink signal of the base station is for example: the strength of the strongest one of a group of downlink signals transmitted by the base station is -65 dBm (taking GSM as an example). It can be measured by a mobile phone or spectrum analyzer. And we can transmit interference signals at the same time on the frequency between 930 and 960. In this area, the mobile phone in this frequency band cannot hear any signal sent by the base station to the mobile phone, and the mobile phone is stupid, which makes it impossible to achieve effective communication. , It has achieved our goal.

　　Precautions for the installation and use of the shield

　　1. Before installing this equipment, be sure to install the antenna correctly according to the signs, and then turn on the power to prevent the machine from being burned. 2. Know the location of the base station before installing the equipment, and try to make the direction of the shielding device follow the direction of the base station. 3. When installing the equipment, pay attention to whether there are metal objects within 1 meter around the machine to avoid signal reflection and affect the shielding effect. 4. Install waterproof and lightning protection measures outdoors. 5. Explosion-proof machines should be installed in special environments such as gas stations and gas stations. 6. The installation height is 1.8-2 meters. It can be placed directly on the table, installed on the wall or on the ceiling. The omnidirectional antenna is perpendicular to the ground, and the directional antenna should be tilted forward. 7. If it is installed indoors, attention should be paid to whether the transmitting frequency of wireless equipment already in the room causes co-frequency interference. 8. The tolerance and safety distance of the existing precision instruments in the room against inter-frequency interference must be considered. 9. If amplifiers such as signal enhancement are installed in the room, the number of jammers needs to be increased. 10. Fully understand the boundary between the shielded area and the non-shielded area.

　　Site survey to understand the signal strength of the site

　　Since there are many kinds of signals in an environment, and the strength of the various signals is different, the shielding instrument can be designed and installed in a targeted manner by knowing the strength of the field signal. In the absence of survey equipment, you need to know the situation of the base stations around the installation site, visually check the distance, what base station (China Mobile, China Unicom, CDMA, PHS, TD-SCDMA, 3G, etc.), and the direction of the base station’s antenna Point to that way. Generally, base stations in cities are mostly built on the roofs of tall buildings, and towers in suburban or rural areas. If you have survey equipment, you only need to record the signal strength of multiple points indoors and outdoors in detail.

　　Design and installation

　　According to the results of the survey, a reasonable combination of different signals has reached the optimal state. The degree of interference in the non-shielded area and the impact on surrounding base stations should be fully considered: determine the rough installation diagram. In the actual installation process, First install the place where the signal is strong (that is, the place closest to the base station), use the directional antenna, and start the installation along the direction of the base station antenna. Considering the floor height of the shielding area, because the signal of the upper layer is better than that of the bottom layer, the installation sequence from top to bottom is adopted to achieve the best shielding effect.

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