Common lightning, fluorescent lamps, electronic equipment, etc. are all sources of interference. At the same time, the out-of-band stray is very large when the mobile phone is working. Although the detector is used for the SAW filter on the mobile phone, the out-of-band suppression of the filter is not enough, and it is easy to produce cross-frequency phenomenon. When used for detection, other interference signals cannot be effectively filtered out, which makes the detection system in chaos. Because 3G technology adopts advanced technologies such as code division, spread spectrum and time division, and is often submerged in environmental noise, its transmit power is smaller. Especially in the time-division technology of mobile 3G, the mobile phone transmits and receives signals in the same frequency band and is separated by time. If it is in an area with strong TD signals, the detected downlink signal strength exceeds that of the mobile phone, and it will be difficult to detect and distinguish . Microwave Homemade Cell Phone Blocker is exactly the same frequency band as the signal, so it can be suppressed to create the illusion of interference.
The switch of Microwave Homemade Cell Phone Blocker is controlled by the detector, and the shielding device is turned on immediately when the mobile phone is detected, hoping to achieve the purpose of immediate shielding. However, the reason why the shielding device cannot be activated immediately in actual operation is that the mobile phone signal jammer mainly achieves the shielding effect by preventing the mobile phone from logging in to the network, and the login command sent by the base station to the mobile phone is issued intermittently. , especially if you have already made a call, when the base station does not send the mobile phone to change the original login command, the mobile phone can generally still talk normally. This phenomenon is more obvious in China Unicom's 3G and WCDMA networks. Unless the cell phone jammer shielding power can be dozens or even hundreds of times higher than that of conventional shielding equipment, the effect of immediately interrupting mobile phone communication can be achieved. Such power is not only difficult to achieve in terms of technology and cost, but its radiation is strong and unsafe.
