The use of full-band signal jammers in school exams has become a trend, but there are many issues that need to be considered before use. For example, when the jammer is activated, the mobile phone will display a signal. Why is this?

First of all, we need to understand how the full-band signal jammer works. It can emit radio signals that conflict with the signals between mobile communication devices, causing the devices to not work properly. When the jammer is activated, the mobile phone will display a signal, which may be due to the following reasons:

1. The interference meter fails to achieve effective interference effect or the interference range is insufficient.

When the signal is displayed on the mobile phone screen and a call is made, the mobile phone can be used normally and the call quality is relatively good, which means that the full-band signal jammer may not have achieved effective interference effect or the interference range is not large enough. In addition, if your mobile phone is close to the jammer but there is no signal, it means that the jammer used is not enough to meet the interference requirements on site, and you need to install some more high-power signal jammers.

2. The interference effect is in a critical state and the interference range is unstable.

Sometimes, the mobile phone shows that there is a signal, but the call quality is very poor, which means that the interference effect of the cell phone jammer on the mobile phone is in a critical state. There is a certain interference effect, but the interference range is unstable. This situation may be caused by the unstable signal strength from the base station signal to the site of use or some mobile phones with strong anti-interference.

3. False signals

When a mobile phone shows that it has a signal, but is actually unable to make calls or even access the Internet, it may be caused by a false signal. At this time, when making a call, the mobile phone will display no signal or restricted services. At this time, it can be judged that the signal displayed on the mobile phone is a false signal, but the actual mobile phone is blocked. At this time, the mobile phone cannot be used normally with the outside world.

It should be noted that the interference range of the full-band signal jammer is related to the strength of the mobile phone signal at the location of the user unit. If the mobile phone signal in the location where the unit is used is strong, the interference range of the device will be shortened; if the mobile phone signal is weak, the interference range of the jammer will be expanded.

In short, before using a full-band signal jammer, it is necessary to comprehensively consider the site, equipment and other conditions used to determine the best use plan to ensure that the interference effect achieves the expected effect. At the same time, interference from mobile phones also needs to be carefully considered to avoid affecting normal communication services and causing certain social impacts.