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source:Industry News release time:2021-05-10 Article author:sznbone Popular:Prison Jamming system
There are many types and models of signal jammers. Before you buy, you should clarify your needs.
First of all, let us briefly understand the basic points that should be understood in the purchase of shielding devices.
Basic principles of shielding
The wireless signal jammer realizes the interference and shielding of the wireless communication signal by transmitting the same frequency interference signal. The transmit power of the jammer directly affects the strength of the interference signal, thereby indirectly affecting the shielding effect of the signal jammer. There is a positive correlation between these three. In other words, the stronger the transmission power, the stronger the interference signal, and the better the theoretical shielding effect in the same environment.
What factors affect the shielding effect?
In the actual use environment, the interference signal emitted by the wireless signal jammer is affected by various factors, the most important of which are as follows:
1. Place the shielding device.
2. Indoor-type shielding device is recommended to be placed at a height of about 180cm-220cm above the ground, and the angle is better to be inclined forward.
3. Whether there are obstructions (such as walls, metal products, human bodies, etc.) between the shield and the wireless communication device.
4. The interference signal emitted by the jammer will be attenuated to different degrees after passing through the obstruction, please try to avoid it.
5. The original wireless communication signal strength in the application environment of the jammer.
6. The weaker the wireless communication signal strength in the use environment, the stronger the shielding effect of the jammer.
7. The distance between the application environment of the jammer and the communication base station.
8. The farther the jammer application environment is from the base station, the stronger the theoretical shielding effect of the jammer.
How to choose the most suitable jammer?
The types of shields that should be selected for different shielding areas are different:
Generally speaking, there are two types of jammers: indoor type and outdoor type.
The former is smaller than the latter in terms of volume and actual output power of the interference signal. Relatively, its production cost and selling price are also lower.
If the area to be shielded is a small and medium-sized room with a simple structure (such as classrooms, examination rooms, offices, meeting rooms, lounges, toilets, etc.), and the actual area is not more than 100 square meters, then it is more appropriate to choose a small and medium indoor shield .
If the area to be shielded is large and empty (such as warehouses; squares; auditoriums and conference venues, etc.), you can consider a large outdoor jammer.
If the area to be shielded is a large indoor space and the structure is more complex, the most ideal shielding scheme is generally a combination of large and small, that is a certain number of mainframes are deployed in a cellular manner to cover a large area, and a certain amount of minicomputers are used to eliminate blind spots, so as to achieve the most ideal shielding effect within a reasonable budget.
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