Why does the mobile phone still have a signal after the desktop jammer is turned on?
With the increasing progress of science and technology, mobile phones have brought great convenience to people. However, in recent years, in various national examinations, cases of cheating on mobile phones have occurred from time to time, seriously affecting the discipline of the examination room. For this reason, the state stipulates that during important examinations, standardized examination rooms need to be equipped with desktop jammers to create a fair atmosphere for examinees. However, when using in different test rooms, it will be found that after the desktop jammer is turned on in individual test rooms, why do some mobile phones still display signals?
The mobile phone has signals. There are several situations.
1. The mobile phone displays a signal. You can try to make a call to see if you can make a call. If the call is normal, the voice is clear, and no interference is received, this indicates that the mobile phone does not achieve effective shielding within this range. If the mobile phone is close to the desktop jammer, there is no signal, indicating that you have a base station or a signal amplifier in the room. Then it indicates that your current desktop jammer cannot meet your on-site shielding requirements, and you can install more high-power shielding devices.
2. The mobile phone displays a signal, but the call quality of the mobile phone is poor. This situation indicates that the shielding effect of the desktop jammer on the mobile phone is critical, with shielding effect, but the shielding range is unstable. This may occur when the signal strength from the BTS to the site of use changes from high to low. This may also happen to some mobile phones with strong anti-interference capability.
3. The mobile phone displays a signal, but the signal is actually false. The mobile phone can't talk normally, nor can it access the Internet. When making a call, the mobile phone will suddenly display no signal, or limit service. At this time, it can be determined that the signal displayed on the mobile phone is a false signal, but the mobile phone is actually blocked.
The size of the shielding range of the desktop jammer depends on the strength of the mobile phone signal at the location of the user. The shielding distance of the screen will be shortened in the place where the mobile phone signal is strong, and the shielding distance will be far in the place where the mobile phone signal is weak.
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