In the case of frequency interference, it occurs like many other advances, including technological advances: there are always people who use them improperly. Interfering transmitters may have legitimate uses, such as protecting certain buildings, such as preventing remote activation of explosives. However, in many cases, even if the person who uses the inhibitor does not understand it, its use may not be appropriate. 

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The GPS jammer itself is usually a small, independent frequency transmitter that can send out interference signals within ten meters of the top five within a certain range. These devices are usually connected to cigarette lighters or USB/charging ports, and require little power. Although GPS jammers are illegal in most areas, they can be purchased online and in a variety of styles, such as B. Wi-Fi jammers, Bluetooth jammers, remote jammers, or drone jammers. 

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The radio frequency part is the heart of the mobile jammer, because the output of the radio frequency part interacts with the mobile phone. The radio frequency range is mainly divided into three parts: voltage controlled oscillator, power amplifier and antenna. The voltage controlled oscillator is very important in the HF range and is a device. The radio frequency part generates radio frequency signals that interact with the mobile phone. 

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After all, it is local. Different environmental impacts are also different. The fault area of the open area is larger than the area with many buildings. Therefore, the measured interference radius is usually better than the actual range. 

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