How to avoid signal jammers on 4G mobile phones?

3 min read

The principle of mobile phone jammer
The mobile phone jammer can connect the base station and the mobile phone through radio waves within the effective frequency range, and use a certain frequency baud rate and modulation to complete the transmission of data and sound. This is the communication of the mobile phone jammer. Principle, according to this principle, when the mobile phone jammer is working, it can scan the low-end frequency from low to high to high-end frequency at a certain speed. At this scanning speed, garbled characters can be formed when the mobile phone receives the signal. interference.  

signal jammer

Therefore, the mobile phone cannot detect the signal sent by the base station when receiving data. This interference cannot completely establish a connection relationship between the mobile phone and the base station. This is manifested in the inability to search for signals, no service, no signal, etc. Waiting phenomenon, in this case you cannot send messages or make phone calls.

Scope of use of mobile phone jammers
The scope of use of mobile phone jammers is still very wide. When taking exams in schools, vehicles will be used to carry large signal jammers around the school to interfere or block the signals from mobile phones in the school in a timely manner, truly making every student All exams are fair.  ​

When conducting an important meeting, the signal jammer can effectively block the mobile phone signal to prevent important information in the meeting from being leaked. Many military bases also use large signal jammers to prevent important military information from being leaked, and to better monitor military secrets through the interception and utilization of communication signals. 

How does the jammer avoid signal interference?
Method 1: Due to the rapid development of wireless networks, it has now developed into 4G networks, and many examination rooms use older models of signal jammers, which can only block 2G networks such as PHS, China Mobile, and China Unicom, but not 3G Even the current 4G network is helpless. The solution is to use a 3G or 4G card.  ​
Method 2: Band cracking method. Because the working principle of the school's jammer is to block the mobile phone by interfering with the mobile phone signal in the specified band, you can prevent it from being blocked by modifying the mobile phone's receiving and transmitting frequency. The jammer only blocks the 900-1800MHZ mobile phone signal, while the mobile phone's receiving and transmitting frequency The frequency is 850-1900MHZ, which is much larger than the shielding range of the jammer, so as long as the mobile phone's receiving and transmitting frequency is adjusted to the maximum in the mobile phone settings, the mobile phone signal can be received normally.

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张佳 2
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