radio can be protected by cell phone jammers
Using multi-band and multi-band mobile phones to test the protection effect of mobile phone jammers in the field is the most convenient, most convenient and most feasible test method. Compared with the limitations of the mobile phone test software and the need for conversion after using professional instrument test software, this method makes it easier for users to understand. The method is as follows: prepare multiple mobile frequency bands, including: one mobile, China Unicom, PHS, 3G (the best of the three 3G standards: Mobile TD-SCDMA, CDMA2000 Unicom, Telecom WCDMA), and then turn on the mobile cell phone jammer, Each portable phone should be installed close to the position indicated on the phone screen, and the mobile phone jammer that has been tested far away can effectively protect the radio. It is recommended to test multiple shielding directions and shielding distances at the same time.
Check if you need to shield the phone: you can’t just check the unit number of the signal on the phone, because sometimes the signal on the phone number is wrong, but it must be an intermittent line phone, which can be tested for free or fixed phone, if it’s disconnected If connected, it is determined that the local fixed telephone number remains within the shielding range. If the plug is pulled out, it indicates that the protective area has been exceeded.
Check whether a certain point is within the protection range, and keep the phone in that position for more than half a minute to confirm whether the phone is blocked.
If the uncovered area on the phone is pulled to protect the area, after a considerable distance in the armored area of the phone, usually it can only be completely shielded. This is because once the phone is pulled, the phone itself has anti-interference function , This anti-interference function will enable the mobile phone to adjust the transmit power by itself to ensure a normal call. Therefore, it is generally not recommended to dynamically detect the call status, but static testing must be performed at each point. After testing all frequency bands, the shortest distance of the shielding radius of a given frequency band is selected as the effective shielding radius of the mobile phone jammer in the area. It can be used to estimate the location when designing large units.