The working principle of the signal jammer is to use frequency multiplication, frequency division filtering and other technologies for the uplink and downlink channels of the mobile phone system to send out the required shielding frequency, formulate a spherical shielding space according to the power of the jammer, and receive the mobile phone through the frequency sent by itself. The frequency emitted by the base station and the wireless router causes interference, and a shielding magnetic field is automatically formed within a specific range, thereby achieving the purpose of shielding the signal.
There is still a difference between the application of signal jammers indoors or outdoors. First of all, there is a certain difference in the action distance. Usually indoor cell phone signal jammers need to consider the indoor layout and the size of the room that needs to be shielded. Due to the wide range of outdoor mobile phone signal jammers, the shielding distance can reach several hundred meters. Usually, when the entire building needs to be shielded, the jammer is applied between outdoor buildings. For places with relatively large distances, it is necessary to apply signals with medium power or above. The shielding device can reach the appropriate distance.
Therefore, for installations in large outdoor areas, it is best to use a shielding device for outdoor use with high power. The casing has waterproof and rainproof functions. In addition, the cell phone jammer needs to be installed in a place with good ventilation, and the antenna should be installed as far away as possible from large objects.
In addition, the shielding distance of the signal jammer has a certain relationship with the environmental conditions at that time, such as the distance of the base station, and whether there is a signal amplifier nearby. When installing and using mobile phone signal jammers, these factors need to be fully considered to avoid dead corners of shielding, which will affect the actual shielding effect.