The Shielding Distance Is Related To The Antenna Gain Of The cell phone jammer
I believe everyone is familiar with cell phone jammer. In the past few years, various jammers on the market have emerged one after another. Everyone claims that their jammers are particularly good, and the information is full of moisture, making you confused. Good or bad, then what should we know about cell phone jammer?
The first point is that the greater the power of the mobile phone signal shielding device, the farther the shielding effect will be. In fact, this is not completely correct. Many manufacturers use ordinary users to detect the actual power status and deliberately exaggerate the disclosure of the power of mobile jammers. The device’s nominal power index loses its reference value. For large-scale shielding systems, shielding technology is a decisive factor affecting shielding effectiveness. The advantages of advanced shielding technology are far greater than the output power factor of cell phone jammer devices.
The second point is to use directional antennas to avoid external interference. This is also incorrect because the directional antenna covers the main lobe, side lobe and back lobe. The main lobe coverage angle is defined as the mobile jammer inclusion angle when the external power of the main lobe drops by 3dB. In other words, the radiation intensity on the side and back of the directional antenna is only much lower than the main lobe. Therefore, if the space close to the antenna is still relatively shielded, the reflection of the shielded building will still cause external interference. In addition, if used improperly, it will cause upstream interference, and its interference range will be larger. Therefore, whether the equipment technology can meet the conditions, the application of the antenna, and the debugging of the system are far more meaningful than whether to use a directional antenna.
The third point is that we all believe that the mobile phone signal shielding distance is a hard indicator. In fact, the distance is not an absolute value. It is related to the strength and quality of the spatial signal. Simply put, distance is meaningless. For the same shielding power, if the distance is 100 meters -70 decibels at the weak point, then only 12.5 meters at the strong -52 decibels. The shielding distance is related to the antenna gain. The same power cell phone jammer host uses different gain antennas, and its distance will be very different. For example, an antenna with a gain of 16 db has a distance of 100 meters, and an antenna with a gain of 4 db has a distance of only 25 meters.
In summary, when choosing a mobile phone signal, it must be combined with the actual situation of the site environment, not only to trust the hearing, but also to test it yourself.