The jammer can make normal radio wave signal reception more difficult or even impossible (such as radio, television, mobile handset, GPS, etc.). The jammer, like the interfered transmitter, transmits the same radio waves, making it impossible to detect normal data sent from the base station.
The most popular signal jammers on the market are cell phone jammers, GPS jammers, WiFi jammers and drone jammers, among which cell phone jammers and GPS jammers are the most common. The mobile phone interference prevents the mobile phone from detecting the normal data sent from the base station, and the mobile phone cannot establish a connection with the base station. At this time, the mobile phone mainly exhibits the phenomenon of searching the network, no signal of the mobile phone, and no service system.
GPS jammers are mainly used for long-distance bus drivers and some people who don't want to be tracked by GPS signals. GPS interference can effectively prevent GPS satellite positioning and tracking, only interfere with GPS signals, does not affect the mobile phone answering, small size, light weight, generally equipped with a car charger, easy to carry.
In the military field, signal jammers applications are very common. This device makes it difficult for others to use a certain frequency band or the entire frequency band. It has also become a noise interference and has been used for a long time as part of electronic countermeasures, such as cars with secret service jammers. It protects the front of the car and prevents attacks such as remote control bombs.
Jamming devices are sometimes used in some civilian areas. For example, interfering devices are placed in German prisons and juvenile detention facilities to interfere with or suppress the frequency of unauthorized radio communications established in the vicinity, thereby reducing prison drug trafficking and jailbreaking. In August 2016, mobile interference phones were tested in St. Pölten, Austria, and were successful. The results show that the test can only prevent the connection between prisoners and does not disturb outdoor mobile communications. According to statistics, the whole Austria will check about 60 to 70 mobile phones in prison every month.
The signal jammers also prevents remote bomb control. In 2007, Pakistani opposition leader Benazir Bhutto survived an attack because the signal jammers placed in the bus blocked the explosion of remotely controlled bombs.
During the Iraq war, it was because the Iraqis used GPS jammers to interfere with GPS navigation data, making the US cruise missiles, bombers, etc. without any targets. During the sandstorm, Americans rely on GPS and airborne surveillance radars, and Iraqis have indeed used GPS jammers, forcing Americans to shut down this strategically important tool.
Interferers are becoming more common in life, but they must not be used in illegal ways.