Misunderstandings of mobile phone signal jammers
I think we are no strangers to cell phone jammer. In recent years, various jammers have emerged on the market in an endless stream, and they claim that their jammers are particularly good. Basic information is also full of deceit, so you can't distinguish between true and false, pros and cons, so what jammers should we know about?
First of all, the greater the output power of the mobile phone signal jammer, the farther the shielding effect will be. In fact, this is not entirely correct. Many manufacturers take advantage of the fact that ordinary users cannot detect the actual power, deliberately exaggerating the openness of the shielded output power, causing the device's nominal output power index to lose the reference value. For large-scale shielding systems, the level of shielding technology is a key factor affecting the shielding effect. The advantages of professional shielding technology far exceed the output power factor of shielding equipment.
Second: Use directional antennas to prevent external interference. This is also wrong, because the directional antenna covers the main lobe, side lobes and back lobes. The main lobe coverage angle is defined as the mobile phone signal shielding coverage angle when the external output 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 relatively shielded, the reflection of the shielded building will still cause external interference. In addition, if it is used improperly, it will cause uplink interference, and its interference range will be larger. Therefore, whether the technical level of the equipment 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.
Third: Everyone thinks that the shielding distance of mobile phone signals is a key point. Actually, distance is not the main thing. It is related to the strength and quality of the spatial signal. In short, distance is meaningless. For the same shielded output power, the shielding distance is related to the antenna gain. The same output power shielding server uses different gain antennas, and its distance will be very different.
Generally speaking, when choosing a mobile phone signal jammer, it must be combined with the specific conditions of the site environment, not only to believe in the sense of hearing, but also to test it yourself.
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