A standard cell phone signal jammer, because it needs to take into account all 2G, 3G, 4G and 5G frequency bands must be effectively shielded at the same time, so generally no less than 10 signal shielding modules are installed inside it, each of which shields The modules will correspond to a cell phone frequency band respectively, so the question arises: in the conventional cell phone signal jammer, which frequency band modules are universally interchangeable?

At the beginning of answering this question, we should first have a general understanding of how the current cell phone frequency bands are divided, and the frequency values occupied by each cell phone frequency band.

According to the internationally accepted cell phone communication frequency band division standard and our domestic actual implementation standard, by the end of 2022, the frequency range occupied by the cell phone communication frequencies we currently know is between 700MHz and 4960MHz. Among them, 4800MHz-4960MHz is classified as the 5G frequency band of China Mobile and China Radio and Television, but this frequency band belongs to the ultra-high frequency cell phone frequency band. At present, there is no preparation for large-scale promotion and deployment in China, and it is only deployed as a communication network in specific places. application only. Therefore, conventional cell phone signal jammers generally do not need to consider configuring the 4800MHz cell phone shielding module for the time being. When the 4800MHz frequency band is excluded, the communication frequency band of cell phones is actually mainly distributed between 700MHz and 3600MHz.

Let's analyze in detail the characteristics of the frequency band division between 700MHz and 3600MHz. In this large frequency range close to 3000MHz, the cell phone frequency band is not completely occupied, but is mainly distributed in several intervals. These sections are: 700MHz, 800MHz, 900MHz, 1800MHz, 1900MHz, 2000MHz, 2100MHz, 2300MHz, 2500MHz, 3400MHz and so on. As a manufacturer of cell phone signal jammers, when designing and formulating shielding modules for the above-mentioned cell phone frequency bands, according to the matching parameters of electronic components such as power amplifiers and signal sources, some of the frequency bands will be combined or share the same set of device combinations. Among these frequency bands, the most common frequency bands that share a group of devices are 800MHz/900MHz, 1800MHz/1900MHz, 2000MHz/2100MHz, 2300MHz/2400MHz, 2500MHz/2600MHz, 3400MHz/3500MHz and so on.

From the frequency band parameters listed above, it can be concluded that although there may be more than 10 different shielding modules in a cell phone signal jammer, in fact there may be at least 4 to 6 module groups of the same style among them. The two modules in the group are universally interchangeable, but they will correspond to the respective cell phone frequency bands by adjusting the frequency offset and bandwidth during factory debugging.