Recently, a customer asked such a question. The original full-band signal shielding device of the unit has a good shielding effect on smart phones, but the shielding effect on old phones is not very good. Why?
First of all, according to the principle of the full-band cell phone jammer instrument, the signal shielding instrument interferes with the communication signal between the base station and the mobile phone, which has nothing to do with the brand and model of the mobile phone. However, due to the difference of mobile phone manufacturers and production processes, As well as the differences in the components used by various mobile phone manufacturers, there are certain differences between mobile phones of different brands and models. We do not consider other functions and only discuss the ability of the mobile phone itself to receive signals. Under the same signal strength , the mobile phone itself has a strong ability to receive signals, and the mobile phone can be used normally in places where the signal is weak. However, the signal strength from the base station to the site does not change at this time, and the shielding range of the full-band signal shielding device depends on the distance of the surrounding base stations on the site, that is, the signal strength from the base station to the site. It has nothing to do with the brand and model of the phone. The fact that the old machine cannot be shielded at the scene of use is because the ability of the old machine to receive signals is stronger. But if the signal at the scene has been interfered by the signal of the signal shielding device, then even the old machine will still have no signal. If the shielding effect of the signal shielding device on the old machine is not good, then the full-band signal shielding device should be adjusted, or the transmission power of each shielding module of the signal shielding device should be increased, or a high-power signal shielding device should be selected, or It is necessary to rationalize the adjustment of the shielding module of the full-band signal shielding instrument, and refine the output frequency of the shielding module again, that is to say, increase the shielding module and split the transmission signal frequency of the shielding module reasonably, such as the original one. The output frequency range of the shielding module is 80MHz. By adding modules, the frequency of 80MHz is divided into two shielding modules for output, so that the shielding effect can be relatively improved, and the signal frequency band used by the elderly machine can be targeted.