Many manufacturers of cell phone signal jammers will mark the shielding distance in their product descriptions, and this distance value is generally not marked as an exact value, usually an approximate number, or a value in an interval range, why Is there such a way of marking? Some buyers will even ask questions: Can the shielding distance of the cell phone signal jammer be accurate to 1 meter?

To understand the answers to these questions, it is first necessary to understand some basic characteristics of wireless signal transmission and coverage (distance).

The shielding signal emitted by the cell phone signal jammer is a radio frequency signal that overlaps with multiple operating frequency bands of the mobile phone. This radio frequency signal is disordered, without specific content or fixed format, which is commonly known as "white noise". Signal. However, its signal transmission method and characteristics are in line with the characteristics of general wireless signal transmission, that is: as the signal transmission distance increases, its signal strength will gradually attenuate, and if obstacles are encountered in the transmission path, it will be affected by the material of the obstacles. The influence of characteristics and appearance size, etc., produce phenomena such as penetration, attenuation, or refraction and reflection.

However, if there are no obstacles in the transmission path, the attenuation process of the signal is a relatively continuous and smooth process. It will not appear at a certain specified distance, and the signal will suddenly attenuate a lot, or suddenly disappear completely to zero. Case.

Let's go back to the original question: Can the shielding distance of the cell phone signal jammer be accurate to 1 meter? From the previous description, it can be known that in a visual environment without obstacles, it is definitely impossible to accurately control the shielding signal of the cell phone signal jammer to a range or distance of 1 meter. The feasible method can only be achieved by means of or using the barrier properties in the environment, and such barriers must also have a sufficiently large attenuation capacity, such as a completely solid reinforced concrete wall.