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source:Industry News release time:2020-11-30 Article author:sznbone Popular:Prison Jamming system
Cell phone jammer interferes with the digital signal in the frequency band by sending high-power triangular waves. If the antenna is placed unreasonably, or the distance is long, or there are obstacles in the middle, it will affect the interference effect.
First, test whether the mobile phone is also interfered near the antenna. If you can talk normally here, it means that the cell phone jammer is faulty or the antenna is not connected properly. Of course, the setting may be incorrect.
Cell phone jammer has frequency bands, and different mobile phones have different frequency bands used for interference. There are two types of GSM, 900M and 1800M. The uplink frequency of narrowband CDMA is: 824MHz-849MHz, and the downlink frequency is: 869MHZ-894MHZ. PHS is a 2G frequency band, so they are different. The jammer should have a specific logo.
Now the school’s cell phone signal jammer is full-band, it can shield all the 2G 3G 4G signals and 2.4G WIFI signals and Bluetooth signals under all the three operators of China Mobile, China Unicom and Telecom.
Some posts say that after turning off the automatic selection of mobile phone network operators, it will not be blocked if it becomes manually selected. In fact, this is not correct because the mobile phone blocker is for all mobile phone frequencies under the three operators It is shielded, so no matter how it is switched, it will be shielded, which means that no matter what the mobile phone card is, it is within the shielding range of the shielding device.
This cannot be avoided by cracking the number and band, because no matter which number or band you use, it is within its shielding range.
There is also Bluetooth software that is not acceptable, because its frequency will also be blocked by the shield.
The only way is to install a mobile phone signal amplifier near the place where the mobile phone signal jammer is used to counter it. When the mobile phone signal becomes stronger, the jammer will be more difficult to shield.
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