Many manufacturers of smart jammers for mobile phones will mark the shielding distance in their product descriptions, but this distance value is generally not marked as an accurate value, which is usually an approximate number or an interval value. Why is there such a marking method? Some buyers will even ask: can the shielding distance of mobile phone smart jammer be accurate to 1 meter?

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

The shielding signal emitted by the smart jammer of the mobile phone is the RF signal overlapping multiple operating frequency bands of the mobile phone. This RF signal is disordered, without specific content or fixed format, which is commonly known as "white noise" signal. However, its signal transmission mode and characteristics conform to the characteristics of general wireless signal transmission and input, that is, with the increase of signal transmission distance, its signal strength will gradually decline. If obstacles are encountered in the transmission path, they will be affected by the material characteristics and appearance dimensions of obstacles, resulting in penetration, attenuation or refraction, reflection and other phenomena.

However, if there are no obstacles in the transmission path, the signal attenuation process is relatively continuous and smooth, and it will not occur that the signal will suddenly attenuate a lot or disappear to zero at a specified distance.

Let's return to the original question: can the shielding distance of the mobile phone smart jammer be accurate to 1 meter? As can be seen from the previous description, it is impossible to accurately control the shielding signal of the mobile phone smart jammer within the range or distance of 1m in an obstacle free intervisibility environment. The feasible method can only be realized by means of or using the obstacles in the environment, and such obstacles must also have enough attenuation capacity, such as a completely solid reinforced concrete wall.

[Shengma] jammer | Nanjing Baikang Electromechanical Technology Co., Ltd. - www.bokangtech com-ljw