The wifi jammer has a very large range of block, can jamming a variety of frequency bands. It is very convenient jamming equipment. Can be used for cinemas, classrooms and other places, completely shield out the annoying phone ringtones.
The telecommunications industry has long opposed jamming cell signals, saying that could interfere with legal cell users nearby. But several companies, including Verizon, A&T, Sprint and T-Mobile, agreed to join in tests of various platforms that can jam all calls or simply unauthorized ones, Stirling said.
This explanation is a bit superficial, and intended for simplifying things. However, if we try to “dig” deeper in to this issue, more parameters may enter the comparison between the signal levels of the two “links”.One example is the SNR (Signal to Noise Ratio) that the receiver “sees”at its input. Sometimes the jamming signal arriving at the receiver input, can be lower than the communication (“partner’s”) signal and still prevail. This is happening because usually the receiver needs a certain “margin” between the two signals at its input, in order to be able to interpret one of them (usually the stronger one). However, in advanced communication systems, this “margin” can sometimes be even negative (meaning that the communication signal can be much lower than the jamming signal), and the receiver will still be able to interpret the “partner’s” signal, making jamming a much harder task.
Desktop cell phone jammer with a large range of interference, interference frequency and more features. In contrast, hand-held jammers with easy to carry, hidden performance characteristics. Just like this small 5 bands jammers, Small and lightweight, hidden performance is very good.
Jamming technology has evolved, as have inmates’ efforts to smuggle in the devices. Such tests could lead to the broader use of technologies like jamming inside prisons to immobilize inmate phones, which officials across the country have described as their No. 1 security threat. The renewed interest in jamming within federal facilities follows an announcement by Deputy Attorney General Rod Rosenstein, who told a national meeting of corrections officials that federal prisons would start testing the technology anew.