Many users say that the shielding device is ineffective, and the actual shielding radius is short, but many of them are caused by wrong methods. So today I will introduce to you an accurate and fast method, how to detect the shielding range of the shielding device on the spot?
1. The most feasible method is a variety of mobile phone field tests. The detection should not be too one-sided: use multiple mobile phones with multiple frequency bands to test the shielding effect of the mobile phone signal jammer on site. This is the most convenient, easiest and most feasible test method. Compared with the limitations of testing software through mobile phones, and the need for conversion after testing with professional instruments, this method is the easiest for users to master. Methods as below:
2. Prepare mobile phones with multiple frequency bands, including: China Mobile, China Unicom, PHS, 3G (preferably there are three 3G systems: Mobile TD-SCDMA, China Unicom CDMA2000, Telecom WCDMA), then turn on the military signal jammer, hold the For each mobile phone, test the effective shielding radius of the shielding device from near to far from the installation position of the mobile phone shielding device. It is recommended that the user should test the shielding distance in multiple directions with the shielding device as the origin at the same time.
3. When checking whether the mobile phone is blocked, you should pay attention not to just check the signal grid number on the mobile phone, because the signal grid number on the mobile phone is sometimes false and does not represent the real communication situation of the current mobile phone. At this time, you must not draw conclusions prematurely. , that the shield is ineffective. Instead, you should dial the mobile phone intermittently. You can try to dial the local toll-free number or fixed landline number. If you can't get through, it is judged to be still within the shielding range. Otherwise, it means that it has exceeded the shielding range.
4. After testing all frequency bands, select the distance with the shortest shielding radius of a certain frequency band as the effective shielding radius of the military signal jammer in this area. The location can be estimated based on this when a large-area honeycomb layout is performed.
If you unplug the phone from the unshielded area to the shielded area, you will often walk into the shielded area for a considerable distance before the phone is completely shielded. This is because once the phone is unplugged, the phone itself has the ability to resist interference. This anti-interference will make the mobile phone adjust the transmit power by itself to ensure the normal call this time. Therefore, it is generally not recommended to perform dynamic testing in the call state, but to perform static testing at various points.