There are many types of electronic jammer , and regardless, the multi band electronic jammer  in its core components are indispensable. After assembling several mobile phone frequency band modules, accurately adjusting the center frequency point, frequency offset, and bandwidth of each module is an important step.

Ten years ago, the price of electronic jammer was not as high as today's frequency bands, only 2G and 3G, and the frequency bands used were only 4 or 5. The workload of debugging a device is relatively small and the time is short. Technicians usually only need to adjust these four or five shielding modules one by one. The debugging process is also very simple. For each interference module, only two adjustable Potentiometer are needed to adjust the frequency offset and bandwidth respectively, and the price of mobile phone shielding equipment is also relatively low

Nowadays, it is not just adjusting four or five shielding modules that can achieve the interference effect of all signals, usually including at least 10 to 20 interference modules. After a multi band mobile phone shielding device has such a large number of interference modules at the same time, the debugging and calibration of each module becomes more time-consuming and laborious, and the debugging efficiency has increased several times compared to ten years ago.