More and more enterprises are starting to use special stubs for communication. As a rule, these people pursue different goals. It all depends on the place where it is used. We will talk about this in more detail.
Let's start with the fact that a signal blocker is used to interrupt communication signals. They come in different models and with different features. The choice of such a device should be based on our preferences and purpose of use.
For example, if you are a teacher, you can use a stub to prevent students from using the Internet and cheating. If it's a theatre, you can also use one to keep people from using the phone and interrupting the actors.
In the subway, communication jammers help fight terrorism. Homemade bombs are most often detonated remotely, via mobile communications. When the signal fails, there is no explosion.
As mentioned earlier, jammers have recently begun to be installed in schools and universities. Most often, this is done at the time of the exams, so that students do not look for answers on the Internet.
Of course, not all such devices are used for good purposes.
Attackers use them to:
* Disable the car or building alarm;
* Interfere with the stolen car;
* Disable the Smart Home system and real-time video surveillance.
But such use of silencers is quickly discovered.
The essence of the jammer is that it creates interference at the selected frequency. This is not signal attenuation, but strong white noise that prevents devices within a certain radius from receiving or transmitting data.
In the device of any jammer, the following elements can be distinguished:
* Generator that controls the voltage;
* Tuning circuit that allows you to select the frequency;
* A source of interference, most often built into the circuit;
* RF amplification unit;
* Transmitting antenna.
The size depends on the power and range. There are compact models, and there are large boxes - like those that are installed at important infrastructure facilities.
Jamming devices can work with different signals. Most in demand are models that block GSM, Wi-Fi, GPS, Bluetooth and radio frequencies (FM).
If you decide to purchase such a device, then carefully determine what type of jammer you need, what signals should be blocked and where you are going to put it in order to determine the characteristics.