How to accurately test the interference distance of phone jammer
To accurately understand the interference distance of the phone jammer is to take the jammer to test the interference distance of the mobile phone on site. During the test, place the jammer at a height of no less than 1.5m and start it up.
Using multiple mobile phones with multiple frequency bands to test the shielding effect of the jammer on site is the most convenient, easy and feasible test method. Compared with the limitations of mobile phone test software and the need for conversion after passing the test of professional instruments, this method is the easiest for users to master. The method is as follows:
Prepare mobile phones with multiple frequency bands, including 2G / 3G / 4G / 5G of China Mobile, China Unicom and China Telecom. Hold each mobile phone and test the effective interference radius of the jammer from the installation position of the phone jammer from close to far. It is recommended that users should test the interference distance in multiple directions from the jammer at the same time. The jammer uses an omni-directional antenna with an elliptical coverage, and the front, rear, left and right coverage effect is the best. For example, when testing in the prison corridor, try to aim the machine at the door or window of the prison, and take the mobile phone to the prison to test the interference effect.
When checking whether the mobile phone is disturbed, you should pay attention to: you can't just check the number of signal cells on the mobile phone, because the number of signal cells on the mobile phone is sometimes false, but you should dial the mobile phone intermittently. You can try to dial the local toll free phone or fixed line number. If you can't dial, it is determined that it is still within the interference range. On the contrary, if you dial, it indicates that it has exceeded the interference range.
To test whether a certain point is within the interference range, hold the mobile phone at that position for more than half a minute to confirm whether the mobile phone is interfered by the phone jammer. To see if the Internet is disturbed, you should pay attention to reopening the web page that has not been opened before (the web page that has been opened has a cache), and log in to the web page again. If you log in, you will not be disturbed.
If you unplug the phone from the non-interference area to the interference area, you will often enter the interference area for a considerable distance before the mobile phone will be completely interfered by the jammer. This is because once the mobile phone is unplugged, the mobile phone itself has anti-interference ability. This anti-interference will enable the mobile phone to adjust the transmission power to ensure the normal call. Therefore, it is generally not recommended to carry out dynamic detection in the call state, but to carry out static test at each point.
After testing all the frequency bands, record the distance of the interference radius of each frequency band to determine the effective interference radius of the phone jammer in this area.
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