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source:Industry News release time:2021-10-09 Article author:sznbone Popular:Prison Jamming system
Why is the mobile phone signal jammer a must-have device during school exams?
When the communication technology was still in the 3G era, mobile phone signal jammers could work perfectly, because at that time, most operators used a relatively fixed frequency band, and the bandwidth was relatively narrow, and interference would be relatively easy. However, with the rapid development of communication technology and the development of 5G and 4G communication technologies, signal jammers are facing a dilemma. The signal interference originally designed for 3G cannot cover 3G and 4G signals due to frequency reasons, resulting in shielding failure.
Fortunately, signal jammers are also constantly evolving and progressing, and soon there will be interference functions specifically for 5G and 4G frequency bands, which can shield these three frequency bands at the same time and space.
Today's communication technology adopts advanced anti-interference technologies, such as frequency hopping, direct sequence spread spectrum (DSSS) and other technologies. However, the suppression of interference by frequency hopping and spread spectrum mainly relies on intermediate frequency filtering, because the front-end high-frequency amplifier and frequency mixing The devices are non-linear devices, and when accompanied by strong interference, intermodulation interference and noise deterioration will occur, that is, blocking of the radio frequency front-end will occur.
In addition, there are many communication interference technologies, such as broadband noise interference, noise interference in some frequency bands, multi-tone interference, frequency sweep interference, tracking interference, smart interference, etc. The mobile phone signal jammer only needs to ensure that the communication signal is shielded in a certain small area, so it is easier to interfere as long as the frequency band can be covered.
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