A GSM jammer or cell phone jammer is a device that sends signals on the same frequency as the GSM system. If the mobile phone is disabled in the area where the interference source is located, the failure is successful. The communication jammer was first developed and used by the military. When tactical commanders use radio frequency communications to control their armed forces, the enemy will be interested in such communications. This interest comes from the basic field of refusing to successfully transfer information from sender to receiver.
Nowadays, compared with electronic warfare equipment, mobile jammer equipment or mobile phone jamming software is becoming a civilian product. With the increase in the number of mobile phone users, the need to disable mobile phones at certain points that will disrupt the ringing of mobile phones is also increasing. Big. These places include places of worship, university lecture halls, libraries, concert halls, conference rooms and other places where silence is important
The portable jammer device sends the signal at the same frequency as the mobile phone, and the two signals collide with each other and cancel each other with high enough power to make the mobile phone overwhelmed. Mobile phones are designed to increase power with little interference. Therefore, the jammer must recognize and adjust the performance improvement of the mobile phone. Mobile phones are full-duplex devices, which means that they use two separate frequencies, one for talking and one for listening at the same time. Some jammers only block one of the frequencies used by mobile phones, and both frequencies are blocked.
The phone was tricked into thinking that there was no service because it could only receive one of these frequencies. Less complex devices block only one set of frequencies, while complex jammers can block multiple network types at the same time to turn off dual-mode or triple-mode phones, and these phones automatically switch between different network types to find an open signal . Some high-end devices block all frequencies at the same time, while other high-end devices can be tuned to specific frequencies.
To interfere with your phone, all you need is a device that transmits on the correct frequency. Although different cellular systems process signals differently, all cellular networks use radio signals that can be interrupted. GSM, which is used in digital cellular and PCS-based systems, operates in the 900 MHz and 1800 MHz bands in Europe and Asia and in the 1900 MHz band in the United States (sometimes referred to as 1.9 GHz). The jammer can be transmitted on any frequency and is effective for AMPS, CDMA, TDMA, GSM, PCS, DCS, iDEN and Nextel systems. Old analog phones and today’s digital devices are equally vulnerable to interference. Interrupting a cell phone is equivalent to interrupting another type of radio communication. A mobile phone communicates with its service network through a base station or base station. The communication tower divides the city into small areas or units. When mobile phone users drive along the street, the signal passes from one tower to another
Interfering devices transmit on the same radio frequency as the mobile phone and interrupt communication between the phone and the base station of the mobile phone in the city. This is called a denial of service attack. The jammer refuses to provide radio spectrum to mobile phone users within the interference range. Sometimes older jammers are used.