Jammers can reduce myopia in children

portable jammer, many people have heard the name. But how and how does the device work? Maybe few people know. Therefore, today we specially invite experts to respond to us.

To interfere, the portable jammer transmits RF power (CW + modulation) at the same frequency used by the enemy link or network. The enemy receiver (“listening” side) receives the signal from the jammer and its “partner”. The strongest will prevail; if the capability of the jammer is greater than that of the “partner”, the “listener” will not be able to “understand” the message / data correctly. Alternatively, if the capacity of the “partner” is greater than that of the jammer, the “listener” will likely be able to “understand” the message / data correctly and the communication link between the “partner” will remain uninterrupted. This explanation is a bit superficial, the purpose is to simplify things. However, if we try to “deep into” the problem, we can compare the signal levels of the two “links” to get more parameters. An example is the SNR (signal-to-noise ratio) that a receiver “sees” at its input. Occasionally, the interference signal reaching the receiver input may be lower than the communication signal (“partner”) and still dominate. This happens because the receiver usually needs a certain amount of “margin” between the two input signals to explain one (usually the strongest). However, in advanced communication systems, this “margin” is sometimes even negative (meaning that the communication signal may be much weaker than the interfering signal) and the receiver will always be able to.

Today, children are using more and more mobile phones. More and more teenagers are starting to wear glasses. What’s wrong in academia? Electronic devices emit harmful blue light that can harm our eyes. As a result, the longer a child uses a cell phone, the faster he or she can become short-sighted. To this end, the Institute of Child Health has developed a device called a cell phone jammer.

This device may emit radio interference, which effectively prevents signal transmission from the mobile phone network. This can effectively prevent children from using the phone for a long time. The device is currently very popular among European parents. In the U.S., certain trends are beginning to prevail.