In fact,cell phone jammer is no longer a novelty in foreign countries and have been selling in China for nearly two years. Radio enthusiasts have even worked out a set of designs and published them on the Internet. The principle is very simple, which is like "talking loudly and talking quietly".
On the working principle of the equipment, there are such professional description: "the operation principle of the mobile phone is in a certain frequency range, mobile phone and base station connected by radio waves, in a certain way of baud rate and modulation complete data and voice transmission. For this communication principle, the cell phone mask is at a certain speed to the low end of the channel to the high-end scan. The speed of the scan can be used to signal interference in the receiver's message, so the phone can't detect the normal data from the base station, and it can't establish a connection with the base station.
Since it only interferes with the downlink signal, the device will not affect the mobile base station when applied, nor will it affect the normal use of other electronic devices.
Why need to jammer cell phone?
Today, smartphones have long been a staple of personal life, and in the student party, there are a number of mobile phone users. How to manage the balance between students' use of mobile phones, learning and entertainment... It seems to have been a difficult problem for parents and schools.
An official of the ministry of education of Massachusetts has proposed funded by the government in the student dormitory installed gsm jammer device, to avoid students at night after lights out by text chat, get to the Internet to affect the second day of learning.
Initially, the mobile phone mask belongs to a special equipment, which is suitable for special departments and special places. In recent years, mobile phone screening devices have started to be used in civilian production, and some schools have been used as a means of preventing cheating or being installed in public places such as oil stations, conference rooms, theatres and hospitals.
Mobile phone signal shielding device first appeared in the late last century, on the market at the time such products are sold to more oil and petrochemical enterprises, in order to avoid the phone switched on when the danger caused by spark. Later, it gradually turned to theaters, examination halls, libraries and other places that need to prevent cell phone interference and keep quiet.
Brazilian prisons have long been plagued by the clandestine use of mobile phones by prisoners. Now, a mobile phone jammer developed by Israel has helped. The device, which costs about 520,000 reais in Brazil, is similar in size to a laptop, with antennas and GPS positioning systems. If prisoners in prison, the use of mobile phones, mobile phone number, service providers and content of the SIM card and other information will be displayed on the instrument screen, not only mobile phone calls will be automatically cut off, prison authorities location can also lock the prisoner.
- The use of cell phone jammers is not a new phenomenon, especially in foreign countries where they have been available for nearly two years.
- In China, radio enthusiasts have even developed and shared designs for these devices online.
- The underlying principle behind these jammers is relatively straightforward and can be likened to "talking loudly and talking quietly."
these jammers operate by interfering with the radio waves used by mobile phones to communicate with base stations. By disrupting the signal between the phone and the base station, the jammer prevents the establishment of a connection, rendering the phone unable to transmit or receive data. Importantly, these devices typically only interfere with the downlink signal, meaning they do not affect the operation of the mobile base station or other electronic devices.
The need for cell phone jammers has become increasingly apparent in various contexts, including educational settings. With smartphones being ubiquitous among students, managing their use in a way that balances learning and entertainment has become a significant challenge for both parents and schools. In response to this, officials in Massachusetts have proposed government-funded installation of GSM jamming devices in student dormitories to prevent late-night distractions that can affect learning the next day.
Initially considered specialized equipment for specific departments and locations, cell phone jammers have transitioned into civilian use in recent years. They are now employed in various settings such as schools, oil stations, conference rooms, theaters, and hospitals to prevent cheating, maintain quiet environments, and enhance security.
One notable example of the efficacy of cell phone jamming technology is seen in Brazilian prisons, where clandestine mobile phone use by prisoners has been a longstanding issue. Israeli-developed mobile phone jammers have been instrumental in addressing this problem. These jammers are equipped with antennas and GPS positioning systems, enabling authorities to detect and block unauthorized mobile phone usage within the prison premises. The ability to monitor and control mobile phone activity not only enhances security but also aids in the management and discipline of inmates.
