Blog

At present, more and more prisons have installed 5G mobile phone jammers, and we often receive project consultations from prisons. Some of the problems in the consultation process can be brought up for discussion and provide us with reasonable solutions. suggestion. For example: Some customers have the general requirement for the goal of building a mobile phone signal shielding project for the prison, or the final effect, that the shielding signal must be 100% effective in covering all areas within the prison wall. However, the prison wall As a boundary, office areas outside the fence, armed police patrol departments, and ordinary houses and factories near prisons should be protected from being affected by shielding signals. So, is such an overall project requirement put forward by the client reasonable? Can it fully achieve the shielding effect expected by customers? If it is not reasonable, how should the prison’s 5G mobile phone jammer project be planned and designed?

First of all, we have to make it clear that the shielding signal emitted by the 5G mobile phone jammer is a radio frequency signal. The transmission and coverage of this wireless signal will affect the coverage and coverage of the shielding signal due to the directional antenna or omnidirectional antenna it uses. Covering direction and so on to control a certain range or distance. However, the control of the range or distance of wireless signal transmission can only be a macroscopic and broad control level at present, and it is not possible to achieve a very precise distance limit, and it cannot be realized with the prison wall as the boundary. It is almost impossible to achieve a wall where the signal inside the wall is completely shielded and the signal outside the wall is not affected at all. In reality, our suggestion is to first ensure that the shielding signal inside the fence can be fully covered, and a buffer zone of at least 20 to 50 meters should be allowed outside the fence. In this buffer area, the impact of 5G mobile phone jammers may appear from time to time.

Next, let’s discuss whether it is reasonable to require full coverage within the prison wall and no dead ends for shielding signals? Our suggestion is: each area in the prison can be divided into key areas and non-key areas. The shielding signal for 5G mobile phone jammers in key areas must be all-round and without dead ends for signal coverage. In non-key areas, you can selectively confirm whether complete coverage is required after analyzing the actual situation. The non-key areas in the prison include: the warning isolation zone near the wall, the outdoor square and the open field of vision, the public activity area, the hall or corridor aisle and other areas where video prisons are installed, etc. The reason why it is suggested that these non-key areas can be considered not to do signal shielding, in fact, we only need to imagine, what is the purpose of installing 5G mobile phone jammers in prisons? It is to prevent detainees from secretly using mobile phones. As for the non-key areas mentioned above, it is obvious that no inmates will blatantly use mobile phones in these places.

In addition, not installing 5G mobile phone jammers in non-key areas of the prison can also reduce project construction costs and save investment. This does not mean that we cannot do it in terms of equipment or technical capabilities. If the prison has sufficient budget funds and is willing to spend a lot of money to build a perfect 5G mobile phone jammer project, we also agree very much!

Whenever the college entrance examination, high school entrance examination or College English Test Band 4 and Band 6, the exam jammer, as an important weapon to maintain the fairness of the test, ensure the stability of the exam and prevent candidates from cheating, will work throughout the entire test process. However, there are still a small number of people who, out of personal desires, try to evade the protective measures in the examination room, and even resort to some extreme destructive behaviors. So how can the exam jammer prevent man-made sabotage?

Usually, during various types of examinations, the competent unit of the examination has two ways when using the jammer in the examination room. The first is to use a desktop jamming device, which is distributed to the invigilator before the exam or distributed to each exam. In the classroom, after the exam is over, it will be recycled uniformly. This method will bring some problems: the distribution and recovery process of the jammer in the examination room is time-consuming and laborious, and the installation and use are relatively casual. Some invigilators place the equipment directly on the podium, and some place it on the stool. Or on the ground, because the interfering device must be powered on before it can be used, it is necessary to connect the main unit of the device to the power socket with an AC power cord, so this method is very irregular. There is also a very important point: the process of frequently distributing and recovering exam jammers will inevitably cause damage and damage to the equipment.

Another way is to use a wall-mounted exam jammer, which means that the jamming device is installed in the test classroom in advance, and it only needs to be turned on when the test starts. This installation method is more standardized and safe, and since the installation height will be slightly higher than the upper edge of the blackboard, it is more effective in preventing man-made damage.

From the analysis of the methods of artificially destroying the jammers in the examination room, the most common ways of destruction are: unplugging the antenna of the interfering device, unplugging the power cord of the interfering device or the network cable for network communication, etc. In order to effectively prevent these damage methods, the current mainstream exam jammers basically adopt the method of building in the antenna, that is, the device is made into a whole shell and installed in a closed manner, and the antenna cannot be directly contacted from the outside. And the SMa-818B5 exam jammer specially designed by Nanjing Bokang Electromechanical Technology Co., Ltd. for the exam environment has achieved the purpose of concentrating the switches, power lines, network communication lines, etc. of the equipment in a concealed installation box. This makes the level of protection against vandalism has been further improved!

Some customers, especially some individual users, after consulting us all the questions about the full-band signal jammer products, proposed to trade and purchase on the e-commerce platform. Unfortunately, Nanjing Bokang Electromechanical Technology Co., Ltd., as a professional manufacturer of full-band signal jammers, only provides our own company’s corporate transaction account and does not support transactions on e-commerce platforms. Customers will be wondering, so why are we doing this? What are the advantages and disadvantages of customers buying products such as full-band signal jammers from e-commerce platforms?

First of all, the current multiple e-commerce platforms cannot always maintain an open attitude towards products such as full-band signal jammers. Since full-band signal jammers involve some sensitive words, this type of product cannot be effective for a long time. The products have been kept on the shelves. As a manufacturer, we need to make frequent and timely adjustments according to the requirements of the e-commerce platform. If things go on like this, we will not spend too much energy on this aspect.

Secondly, due to the fierce competition of products on the e-commerce platform, in order to receive orders, the phenomenon of lowering prices and comparing prices with each other emerges endlessly, and the merchants who sell full-band signal jammer products on the shelves are often distributors who take advantage of the loopholes of the e-commerce platform For merchants or individual stores, we only need to analyze that dealers must have profits before receiving orders, and e-commerce platforms also need to share profits from orders, so mobile phone signal devices with very low selling prices themselves will not receive orders in multiple profits. After splitting, the production cost that can be used in products will be very low, and the result will inevitably be to choose cheap or low-quality electronic components. The quality of such full-band signal jammers will definitely not be guaranteed.

Finally, because the sellers who sell full-band signal jammers on the e-commerce platform are often middlemen and are not real manufacturers, although after-sales service can be guaranteed by the e-commerce platform, the choice of full-band signal jammers and Use, especially some customized functions, are of relatively high technical content. When e-commerce platforms sell full-band signal jammers, they can only guarantee the return service, but when encountering technical exchanges, program design, installation When there are problems such as precautions for use, fault analysis and troubleshooting, the e-commerce platform cannot provide timely and reliable service guarantee.

Due to differences in application environments or usage scenarios, the antennas configured for 5G jammers usually have two options: omnidirectional antennas and directional antennas. It is easier for customers to understand the coverage and signal transmission direction of omnidirectional antennas, but they do not know much about the signal transmission direction and coverage of directional antennas. Some customers will directly ask us: Will the 5G jammer no longer interfere with the sides and rear after using the directional antenna?

The so-called directional antenna, it can be seen literally that it must be directional. When explaining to some customers who are not familiar with the field of wireless communication, sometimes a vivid analogy is used, that is, the radiation emitted from the directional antenna. The wireless signal is emitted in one direction just like the light from a flashlight.

However, the reason why customers would ask such a question, wondering whether the 5G jammer will no longer interfere with the sides and rear after using the directional antenna, is precisely affected by the above-mentioned analogy, because the light emitted by the flashlight, It will only illuminate the front, the sides and the back are blocked by the flashlight reflector, there is no light spreading to this part of the area at all.

However, when the 5G jammer uses a directional antenna, the transmission path and coverage of the interference signal emitted are really not the same as the form of light transmitted by a flashlight. If the signal transmission of the directional antenna is detected and modeled in 3D through a microwave anechoic chamber, we can intuitively see that there are still interference signals continuously emitted from the sides and back of the directional antenna. It’s just that the signal strength and transmission distance in this area will be significantly lower than those in the front direction.

The wireless signal emitted in the front direction of the directional antenna is called the main lobe, which has a lobe angle. In the analogy with the flashlight light, in fact, the coverage area of the main lobe is used as a similar object. , which ignores several other sublobes.

In addition, what we need to further understand is that there are many classifications of directional antennas, and the working principles, antenna materials, and manufacturing methods are also very different, which will also cause the main lobe of the directional antenna, the lobe angle of the secondary lobe, and the transmission distance. The difference is huge, and customers must carefully screen and make choices when configuring directional antennas for 5G jammers.