How is the effective shielding distance of the mobile phone signal jammer measured?
How far is the effective shielding distance of the cell phone signal jammer? How to test the effective shielding distance of a mobile phone signal jammer? Today we will introduce to everyone.
A feasible method for testing the effective shielding distance is a variety of mobile phone field tests. The detection should not be too one-sided: Use multiple mobile phones with multiple frequency ranges to test the shielding effect of the mobile phone signal jammer on the spot. This is a convenient, trouble-free and feasible test method. Compared with the limitations of passing the mobile phone test software, and the need to convert after passing the professional instrument test, this method is easy for users to grasp. Methods as below:
Prepare mobile phones with multiple frequency bands, including: China Mobile, China Unicom, PHS, 3G (There are three modes of 3G: Mobile TD-SCDMA, China Unicom CDMA2000, Telecom WCDMA), then turn on the mobile phone signal shielding device, hold each mobile phone, The effective shielding radius of the mobile phone shielding device is tested from near to far. 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 during the test.
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 current mobile phone communication situation. At this time, we must not draw conclusions too early. This shield has no effect. Instead, you should dial the cell phone intermittently. You can try to dial a local toll-free number or a fixed landline number. If the call fails, it is judged to be still in the shielding range. Otherwise, the shielding range is exceeded.
After all the multiple frequency bands are tested, select a certain frequency band with a short shielding radius as the effective shielding radius of the mobile phone signal jammer in this area. The position can be estimated based on this when carrying out a large-area honeycomb layout.
The above is a particularly effective and simple way to test the radius of the jammer in this environment, but it should not be judged too early. The shielding effect of this jammer can only be so far, and it is necessary to check whether there are base stations around. The shielding effect has a great influence. If the shielding device can meet the requirements of the examination room, it can be used with confidence.
It should be noted that to test whether a certain point is within the shielding range, you should hold the mobile phone in this position for more than half a minute to confirm whether the mobile phone is shielded.
If you dial 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 dialed, the phone itself has the ability to resist interference. This kind of anti-interference will make the mobile phone adjust its transmitting power 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.