Today, smartphones are all analog signals. The analog signal has strong anti-interference. Generally speaking, the actual effect of pulse signal technology on analog signals is relatively weak. Therefore, analog signals should be used for actual images. Data electromagnetic interference and simulated electromagnetic interference with the same output Power have very different actual effects on smart phones. Data How To Make Cell Phone Jammer Circuit Technical shielding has lower output Power and higher efficiency than pulse signal technology shielding. The analysis of data signal and electromagnetic interference in the room, attenuation coefficient, reflection surface, etc. is more complicated. Before being shielded, the compressive strength and quality of the local indoor space data signal are very harmful to the shielding, and the actual effect of different mobile phones is also different. cell phone jammer Generally, the actual effect of anti-interference on mobile phones with strong working ability to accept weak data signals may not be good. The position of the communication base station and the angle of the shielding area of the mobile phone also endanger the actual effect of the shielding.
The shielding distance and the characteristics of wireless communication data signal transmission distance. Nowadays, the shielding distance is simply discussed by the attenuation coefficient of wireless communication data signal transmission in free space. According to the basic theoretical formula of transmission, the electromagnetic wave transmission distance is doubled, and the receiving sensitivity attenuation coefficient is 6db. (The output Power of the data signal is reduced by 4 times). Let us take a How To Make Cell Phone Jammer CircuitGSM900MHZ as an example. If the receiving sensitivity of a mobile phone in a region that must be shielded is -50dbm, and the shielding distance of the shielding device is 10 meters, the change of the receiving sensitivity on the mobile phone will harm the distance of the shielding at the same time. The above discussion is based on the regularity of the transmission of wireless communication data signals in free space (that is, free space is close to outer space). In actual conditions, there are many obstacles that endanger the transmission of electromagnetic waves. Only judgment is used as a reference, especially when there is a huge distance between the regularity and reality in the room. Therefore, this problem is difficult to accurately measure for the time being, and it can only be clarified based on the specific conditions of the construction site. The correct construction project must undergo preliminary investigation and signal testing, and then design the actual solution. In the middle and late stages, follow-up inspections are required immediately, and some corresponding supplements should be made to ensure that it is foolproof, that is, to achieve the actual effect of strict shielding. For example: Influencing the language expression of others, how many sound effects can be used to affect the voice of him and the audience, the quality of the language expression picture, the indoor echo, and the distance between the speaker and the audience are also related.
