Discussion on the working power of signal jammer and shielding range
How to improve the shielding effect? What are the parameters to consider:
1. Operating power of the equipment
① Shield the output power of signal equipment
② Whether the antenna radiation performance is gain antenna and directivity, etc.
2. Working mode shielding.
Today, mobile phones are filled with digital signals. Digital signals have strong anti-interference capabilities. Generally speaking, the actual effect of technical interference on digital signals is weak. Therefore, it is necessary to use digital signals to interfere with digital signals and data with the same efficiency.
The interference effect of jamming signals and simulated jamming signals on smartphones is very different. Signal blockers that use digital jamming technology have lower power and are more efficient than jammers that use digital jamming technology.
3. The room is different from the outside.
The analysis of the generation, loss, and reflection surfaces of data signals and interference signals in the room is relatively complex.
The analysis of the generation, loss, and reflection surfaces of data signals and interference signals in the room is relatively complex.
4. The direction and angle of the communication base station in the shielded area on the mobile phone will also affect the actual shielding effect.
The characteristics of shielding distance and wireless signal transmission distance. Now we can simply discuss the shielding distance based on the loss of wireless signal transmission in scale space. Calculated according to the theoretical formula of transmission, every time the electromagnetic wave transmission distance doubles, the network signal loss is 6db (signal output power reduced by 4 times). Let's take a certain cell phone jammer 8 bands Wifi Jammer as an example. If the mobile phone signal in a certain area that needs to be blocked is -50dbm, and the effective shielding distance of the jammer is 10 meters, the change in the mobile phone signal will also affect the shortness of the shielding distance. Far.
① Generally, indoor space network signals are around -60 to -70dbm, and the base station can reach a maximum of -40dbm within a few hundred meters. The received strength range of mobile phones is generally between -35 to -95dbm.
②The higher the intensity of the indoor spatial signal output power, the smaller the shielding distance.
The above discussion is based on the regularity of wireless signal transmission in scale space (the scale space is similar to outer space). In reality, there are many obstacles that affect the transmission of electromagnetic waves on the road. The above results are only within the scope of judgment. References, especially in rooms, are far apart from regularity and concreteness. Therefore, this issue is difficult to accurately measure at the moment and can only be clarified based on the actual conditions at the construction site. Accurate construction projects must carry out early investigations and signal tests, and then design actual solutions. In the later stages, timely tracking and testing are required, and certain corresponding fillings must be made to ensure that everything is foolproof, that is, to achieve the effect of strict shielding. For example: to interfere with someone else's speech, how much sound should be used to interfere with his and the audience's voice, the quality of the speech picture, the echo in the room, the distance between the spokesperson and the audience and the interfering person are also relevant.
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