If the signal jammer fails, you must first know the working principle and how to make the mobile phone have no signal. It is to transmit a white noise interference signal with the same frequency as the mobile phone signal. When the signal strength emitted by the signal jammer is stronger than the signal emitted by the base station to the site, the mobile phone signal is completely covered by the signal jammer, and the mobile phone will show no signal or limited service. How can the mobile phone still have a signal without damaging the device? The following are two methods.

First, reduce the power supply voltage of the signal jammer. Generally, it is necessary to connect to the AC 220V mains. The signal jammer has a power adapter or a switching power supply to convert it into DC power. The power adapter and the switching power supply, even if they use a wide voltage power supply, are 85-265V or 100-265V. If you want to make the device fail, then let the power supply voltage drop below 85V or above 265V. Of course, this method is generally not easy to implement and requires professionals to operate. And you need to pay attention to safety during operation, and there are certain safety hazards.

Second, the mobile phone signal strength at the scene can be increased, making the mobile phone signal strength at the scene higher than the signal strength emitted by the signal jammer, or the signal jammer can be made inoperative. This method requires the use of a mobile phone signal amplifier, which requires a receiving antenna. The receiving antenna should be placed away from the signal jammer.

The signal coverage range can normally receive the mobile phone signal, otherwise it will still be interfered by the signal jammer. Then place the transmitting antenna of the mobile phone amplifier at the site where the signal jammer is used.