Most of the common wireless signal jammers on the market do not have power adjustment functions, such as signal shielding equipment used for signal shielding in examination rooms or signal shielding in conference venues. However, there are still some customer groups who hope that the shielding equipment has a power adjustment function. Most of the purpose of this is to avoid shielding the signal range from being too wide, affecting or interfering with other unrelated areas. So, for a signal shielding device with power adjustment function, should it be adjusted overall or by frequency band? What about transmit power?

Looking at this issue from the customer's perspective, customers certainly hope to be able to realize the power adjustment operation of the signal shielding equipment simply, conveniently and quickly. For example, the output power can be adjusted via a physical power adjustment knob. However, such expectations are actually difficult to achieve, and trying to achieve overall power adjustment with a simple knob is basically unfeasible. This is because the wireless signal jammer is divided into frequency bands according to different frequency bands and signals of different formats, and consists of at least ten shielding modules. Each shielding module only interferes with signals within the current frequency band. Take mobile phone signals as an example. For mobile phone signals in different frequency bands and different formats, even at the same location, the signal strength received from the base station is actually different. The result of this difference is that when the cell phone signal jammer targets mobile phone signals in different frequency bands and different formats, the effective shielding distance is also different, sometimes greatly.

It is obviously inappropriate to only use an adjustable potentiometer to adjust the overall power of the signal shielding device. The correct approach is to adjust it separately for each different frequency band. This is why you can see that any wireless signal jammer with power adjustment function has multiple power adjustment knobs, and the number of these adjustment knobs corresponds to the shielding module. The power adjustment of the signal shielding device can control the effective shielding range more accurately, but if the user only relies on the adjustment of the power adjustment knob, only a general effect can be achieved.