Category: NEWS

In the application field of mobile phone jammers, if it is divided according to the coverage direction of the shielding signal, there are two basic classifications, namely: omnidirectional antenna coverage and directional antenna coverage. By default, the standard configuration of the low-power mobile phone jammer is an omnidirectional antenna, and the high-power shielding device will choose whether to use a directional antenna or an omnidirectional antenna according to the actual usage scenario. Some customers will ask questions: Can the two types of antennas be configured at the same time for the antenna in the mobile phone jammer, and can it be quickly switched to directional or omnidirectional when in use?

The customer’s idea seems simple, but it is not easy to realize it on the mobile phone jammer. During the transmission of radio frequency signals through radio frequency cables, it cannot be simply understood as circuit switching like electrical circuits. The switching of radio frequency signals requires a power divider or a dedicated radio frequency switch, but such a radio frequency switch has very few application scenarios, and there are very few devices to choose from. At the same time, there are two other reasons that limit the possibility of adopting Power switching method: The first reason is that after the RF signal has undergone a power switching switch, at least two RF interfaces for signal input and output will be added. Every time an RF interface is added, the RF signal will experience signal attenuation. This will cause the effective output power of the mobile phone jammer to be further reduced. The second reason is that each mobile phone jammer will include at least 10-12 signal shielding modules of different frequency bands, and each shielding module needs to correspond to a set of directional antennas or omnidirectional antennas. If you want to complete the switching of radio frequency signals function, it is necessary to add radio frequency switching switches to the output terminals of these 10-12 signal shielding modules, which will undoubtedly greatly increase the production cost of mobile phone jammers.

Based on the above analysis, it is not impossible to quickly switch the antenna of the mobile phone jammer to a directional or omnidirectional mode at the moment, but considering the overall production cost, the customer’s budget and the actual demand are not large, so each mobile phone Jammer manufacturers have not invested energy to achieve such functional requirements.

When customers purchase mobile phone signal jammers, generally as long as they do not make special instructions, the manufacturer’s default factory frequency band does not include the shielding module for GPS positioning signals. However, if the customer orders the shielding device, it is very clear. : It is necessary to shield GPS positioning signals while shielding all mobile phone signal lights, so the manufacturer can specifically add the shielding module of the GPS frequency band to the device.

Why is there no GPS frequency band in the default configuration of the low-power mobile phone signal jammer? There are three main reasons: the first reason is that low-power cell phone signal jammers are almost always used in fixed indoor environments, and the GPS signal itself in the indoor environment is very weak, or even there is no GPS signal, and the GPS signal is shielded. The function is also useless. The second reason is that the primary purpose of the low-power mobile phone signal jammer is to shield the mobile phone signal. In order to reflect the shielding performance of the mobile phone signal as much as possible, the manufacturer’s preferred solution is: the number of effective signal shielding modules, Allocate as many frequency bands as possible to mobile phone signals. The third reason is that in order to control the production cost of the mobile phone signal jammer manufacturers, if a function is not required by the customer, then install one less module. After all, it can reduce some production costs and improve the performance of some mobile phone signal jammers. Price advantage.

However, it needs to be reminded that today’s GPS positioning signal is just a general term, and it does not specifically refer to the GPS navigation satellite signal of the United States. In fact, it should at least include China’s Beidou, Europe’s Galileo, and Russia’s GLONASS, etc. etc. When GPS signal shielding modules are added to the satellite navigation and positioning systems of these multiple countries and types, they should all be able to effectively cover them.

In recent years, drone jammers have continued to develop in the direction of high-power output, mainly because the current drone technology is advancing by leaps and bounds, and the effective distance and anti-jamming ability of flight control and image transmission have been improved compared to the past. a lot. As a manufacturer of drone jammers, the quickest and most effective way to form an effective confrontation with them is to increase the transmission power of jamming signals. Then the question arises: what is the appropriate transmission power for a high-power drone jammer?

Looking back five or six years ago, or even earlier, the transmission power of drone jammers at that time was generally not large, and the transmission power of each signal jamming module only needed 5W-10W, and only so much was needed at that time with a higher power, you can get a very good jamming effect against drones. However, with the advent of more and more commercial drones, in the actual testing and use process, it has been found that if the original transmission power is still used, the interference distance will obviously be greatly reduced. Therefore, as a manufacturer, we began to increase the transmission power of each module, and increased the output power of the interference signal of each module from 5-10W to about 20W.

However, today, as drone manufacturers adopt more and more frequency hopping communication technologies, and at the same time expand several other communication frequency bands, and also develop newer anti-jamming algorithms and anti-jamming countermeasures ability, if the drone jammer’s module transmission power continues to use the output power of 20W, it will be found that the effective interference distance has become very short when facing those new drone s with new technology capabilities. What should I do? Further increase the output power of the module, and continue to increase the power of 20W to the level of 50W.

The transmission power of the current high-power drone jammers is generally at the level of 50W, which is the preferred solution for various manufacturers. Of course, in addition to this method, there are other methods that can improve the jamming effect without increasing the power. methods, which we will continue to answer later.

Recently, a customer put forward a special functional request to us: only the 5G mobile phone signal needs to be shielded, and other 2G, 3G, and 4G signals do not need to be shielded. Ask us, as a professional manufacturer of 5G jammers, can we Can not help them achieve such a function.

First of all, based on the current frequency band division standards of various communication operators, it is possible to customize a 5G jammer that only shields 5G signals and does not affect other mobile phone signals. This requirement can be met and realized. Take the frequency bands used by 5G mobile phones of the four major mobile communication operators in mainland China as an example. Since the 5G signal frequency bands used by each operator are relatively clear and fixed, we only need to install the fixed frequency bands in the 5G jammer. The 5G signal shielding module of the segment is enough. For example: 5G in the 2.6G frequency band of China Mobile, the specific frequency range is 2515~2675MHz, 5G in the 0.7G frequency band shared by China Mobile and China Radio and Television, the specific frequency range is 758~788 MHz, China Telecom’s 5G in the 3.5G frequency band , the specific frequency range is 3400~3500 MHz, China Unicom’s 3.6G frequency band of Unicom 5G, the specific frequency range is 3500~3600 MHz.

If you only need to shield 5G signals, you only need to cover the above four 5G frequency bands to completely cover the shielded signals, that is, the 5G jammer should include at least four 5G signal shielding modules. Of course, this is only to meet the most basic needs of shielding 5G signals. If you want to further improve the 5G shielding effect, we suggest that you can split the above four 5G frequency bands, and use the original coverage of each module in the 5G jammer. The frequency range is divided into two, so that the same module power can be applied to a narrow frequency bandwidth, which helps to improve the shielding effect of 5G signals.

Backpack-style wireless signal jammer, because of its exquisite shape and directly carried portable features, has been very popular and favored by customers. When customers inquire about products, they also hope to know the relevant performance of this shielding device first. However, During the consultation process, one question is often asked: worrying that the electromagnetic radiation of backpack wireless signal jammers will affect the health of users. So, here we will answer this question separately to eliminate customers’ worries.

The scenario that is easy to imagine is: the user carries this backpack-style wireless signal jammer on his back, and the several antennas on the top of the device are almost exactly behind the user’s head. So the customer will immediately think: In this case, the radio frequency signals of so many antennas are transmitted at the same time, and the transmission power is generally not too low, and electromagnetic radiation will definitely be generated. The user’s brain has the greatest impact!

However, the real application scenario is not like this, and the above-mentioned usage is only based on the simple assumption of the customer. The real application is that the backpack-type wireless signal jammer has never been required to be carried by a person. down to start use. This wireless signal jammer adopts a backpack-style appearance design. The purpose is to carry it easily and quickly carry the equipment on the back. When arriving at the use site where signal shielding is required, the correct approach should be: Find a suitable high and stable place suitable for placing the wireless signal jammer, and then turn on the shielding device, then the staff can evacuate and keep a certain safe distance from the wireless signal jammer. That is to say, when the shielding device is turned on and working continuously for a long time, there is absolutely no need for the staff to stay next to the backpack wireless signal jammer, let alone carry it on the staff’s shoulders.

Therefore, the final conclusion is: there is no need to worry about the electromagnetic radiation of backpack wireless signal jammers. Unless it is in an emergency combat state, it is not required to turn on the shielding device while the personnel are carrying it.

During the college entrance examination and high school entrance examination held as scheduled every year, some schools will be designated as examination rooms. During the construction of standardized examination rooms, these schools will purchase and install a large number of mobile phone jammers. How to solve it?

Most of the mobile phone jammers used in the standardized test room are low-power mobile phone signal jammers. Its RF transmission power is usually 2-3W for each frequency band, and the total RF transmission power of the whole machine is about 30W. The overall power consumption of a mobile phone jammer is roughly in the range of 120-200W. The mobile phone jammer itself will be equipped with a switching power supply (or a power adapter), which is used to convert the AC 220V into 5V or 12V DC to provide power consumption for the device.

Because there will be dozens or even hundreds of exam classrooms in a school, the number of mobile phone jammers is corresponding to it. In order to turn on or off such a large number of mobile phone jammers in a centralized manner, the easiest way is to concentrate the power supply of all mobile phone jammers in each teaching building on one AC power supply line.

However, in many standardized test classrooms, monitoring systems, closed-circuit television systems, and campus broadcasting systems are installed at the same time, and these devices are usually equipped with switching power supplies. The power supply of the jammer should be powered by the DC on the monitoring line? The purpose of doing this is to save a part of the switching power supply and the cost of power line layout.

This method is not advisable, the main reason is: the power consumption of each mobile phone jammer is not low, when using AC 220V power supply, the current in the power line is close to 1A, multiple mobile phone jammers are connected in parallel When the power line is on, the total current value will only accumulate slowly. If it is replaced with a DC power supply, according to the conversion of power consumption, current and voltage, the current occupied by a single mobile phone jammer will reach 10-20A. When multiple mobile phone jammers are connected in parallel on a DC power line, the total current It will reach hundreds of A, which is obviously not in line with the correct circuit usage specification.

After purchasing the portable signal jammer, some customers put the shielding device into actual combat tasks very enthusiastically, but sometimes they will feedback some information: the coverage of the shielding signal is a bit small. And after changing different working environments, I feel that the shielding distance of the shielded signal is relatively large in some scenarios, and relatively small in some scenarios. Ask us what is going on?

First of all, the transmission power of the portable signal jammer itself is fixed. That is to say, the strength of the shielding signal emitted by it is relatively stable and will not fluctuate. In different environments, there will be several factors that affect the coverage of the shielding signal, such as: the distance of the base station, buildings or The error of the wall obstacle, etc., these will directly affect the effective shielding distance of the shielding signal.

Secondly, the placement of the portable signal jammer is also critical. Since the height of its main box is about 70cm, its antenna is directly screwed on the main box, that is to say, if the portable signal jammer is placed directly on the ground, the height of its transmitting antenna from the ground will generally not exceed 1 rice. To increase the coverage of the shielded signal, the easiest way is to increase the height of the antenna from the ground. When the height of the antenna increases, the effective shielding distance of the shielded signal will be greatly increased.

So, what are the advantages of increasing the height of the antenna? We suggest that users should first observe the terrain and terrain, and try to choose the highest point to place the portable signal jammer. Or use some desktops, steps or buildings, etc., and try to use these positions to increase the height of the portable signal jammer.

There is another way: you can choose our company’s antenna bracket, connect the antenna of the portable signal jammer to the host through a 3-meter-long feeder, and install the antenna on the bracket. Our customized antenna bracket can put the antenna Raised to a height of 3 meters.

As the higher-level competent authorities’ control measures for the standardized use of drones are becoming more and more perfect, the commercial drones sold by regular drone manufacturers are strictly in accordance with relevant regulations, and the drones sold are pre-set. Some restrictive parameters are set, for example, in some areas that are set as no-fly zones, drones will not be able to take off, and in the main urban areas of some major cities, the flight height limit has been calibrated, and the drones of regular manufacturers will not be able to take off. Will fly beyond the flight limit. However, after all, there will be some individuals or small groups who want to break through these restrictions for some special purposes, so they will modify some types of drones privately, so as to get rid of the regulations and restrictions on the use of drones. How should drone jammers defend against these privately modified drones?

We need to analyze the aspects from which the drone is usually modified privately:

The first way is to modify or release the restrictions on the built-in parameters of the drone, which requires professional technicians who know how to write and modify the built-in programs of the drone. This method is more difficult. It is difficult for ordinary people to get started. If it is only through this method to unlock the drone restrictions, then the drone jammer hardly needs to make any adjustments, and it can effectively attack or defend against this type of drone.

The second way is to modify or replace the flight control frequency band and image transmission frequency band of the drone. If you want to make such a modification, you need a corresponding hardware engineer to complete it. It is usually to buy some communication modules of uncommon types of communication frequencies to replace the original data transmission components of the drone, or to purchase some communication modules with higher power and stronger anti-interference ability to enhance the drone. The flight altitude and distance of the aircraft. For this type of modification, the drone jammer must be adjusted accordingly. Our suggestion is to add jamming modules in multiple frequency bands. Since the other party expects to maintain normal communication by adding communication modules of different frequencies, we take into account all the wireless communication frequencies that the other party may use, and implement high-power interference on all these frequency bands.

Some customers may have questions, what if the unmanned aerial vehicle is modified privately to use a communication frequency that is not commonly used at all? Can the drone jammer still have the corresponding frequency interference to strike it? In fact, there is basically no need to worry about this, because the communication components, especially some core radio frequency components, that are required for private modification of drone s are not individuals who have the ability to define frequencies and produce them at will. Such devices that can be purchased online are produced and supplied in accordance with the relevant frequency band division standards in the industry. So to sum up, no matter how the drone is modified privately, our drone jammer can also be perfectly solved by adding the corresponding jamming module.

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

First of all, the current multiple online trading platforms cannot always maintain an open attitude towards products such as wireless jammers. Because wireless jammers involve some sensitive words, this type of product cannot be used for a long time. To keep it on the shelves, as a manufacturer, we need to make frequent and timely adjustments according to the requirements of the online trading platform. In the long run, we will not spend too much energy on this aspect.

Secondly, due to the fierce competition of products on the online trading platform, in order to receive orders, the phenomenon of lowering prices and comparing prices with each other emerges endlessly, and the merchants who sell wireless jammer products on the shelves often take advantage of the loopholes of the online trading platform dealers or personal stores, just need to analyze, dealers must have profits to receive orders, and online trading platforms also need to share profits from orders, so the mobile phone signal device itself sells at a very low price, After multiple profit sharing, the production cost that can actually be used in the product will be very low, and the result will inevitably be to choose cheap or low-quality electronic components, and the quality of such wireless jammer products will definitely not be guaranteed.

Finally, because the sellers who sell wireless jammers on the online trading platform are often middlemen, not real manufacturers, although the after-sales service can be guaranteed by the online trading platform, the choice of wireless jammers and Use, especially some customized functions, are of relatively high technical content. When the online trading platform sells wireless jammers, it can only guarantee the return service, but when it comes to technical exchanges, program design, installation, etc. When there are problems such as precautions for use, fault analysis and troubleshooting, the online trading platform cannot provide timely and reliable service guarantee.

Some outdoor application places generally choose high-power mobile phone jammers, such places include but are not limited to: prison farms, oil depots, power stations, gas storage stations, mining areas, etc. Their common characteristics are: a wide area, a large open area, and a large-scale building structure inside. When the above-mentioned units choose high-power mobile phone jammers, they often pay attention to one point: it is hoped that the shielding distance of the shielding equipment will be as large as possible. Effects that override the entire unit. Then the question arises: what is the maximum shielding distance of the existing high-power mobile phone jammers? Is there any shielding device that can shield a distance of more than 2Km?

What we are discussing here is specifically the shielding distance for mobile phone signals. Check and compare the product information of various high-power mobile phone jammer manufacturers. Even if the power is 100-200W, its nominal effective shielding distance is generally 200-500 meters. Almost no manufacturer can achieve a nominal value of effective shielding distance above 2Km. Why? There are two main reasons. The first is the selection of RF power amplifier devices. The maximum power of the mainstream RF power amplifier devices on the market usually can only reach 200W. No matter how high the power is, it is possible that the shipments are too small, the cost of the device is too high, or special customization is required from the power amplifier manufacturer. This has caused manufacturers of high-power mobile phone jammers to give up choosing such ultra-high-power power amplifiers due to cost issues. The second reason is that the current mobile phone base stations are very densely deployed, especially in the main urban area of the city, there will be at least two or even more mobile phone base stations within a randomly selected 2Km range. We should all know that the shielding distance of mobile phone signals depends on the distance between the mobile phone jammer and the mobile phone base station, and the relationship between the two is inversely proportional.

Through the above analysis, we can know that the high-power mobile phone jammers that can be selected now have a nominal shielding distance of only about 500 meters at most. The coverage distance is more than 2Km. However, if it is in a sparsely populated area in the wild, and the base station construction distance is several kilometers apart, it is possible that a single set of high-power mobile phone jammers will have a coverage distance of 2Km.

Now many universities will build standardized test rooms for English CET-4 and CET-6, and test room signal jammers are usually one of the necessary safeguards for standardized test rooms. So what are the common problems in installing test room signal jammers during the project construction process?

At first, the project construction party thought that installing the signal jammer in the examination room was a relatively simple job, thinking that it would be enough to hang the shielding device on the wall and then turn it on. As everyone knows, this is just a simple way to deal with it, and it often does not achieve the best shielding effect. Especially in some complicated on-site situations, it is very likely that the signal jammer in the examination room is installed, but the shielding effect is not ideal.

To install the test room signal jammer in the classroom of the university, you first need to consider the choice of installation location. The more common installation location is on both sides of the blackboard at the front or rear of the classroom, but when choosing a specific fixed location, you need to pay attention to: the test room signal The antenna area of the jammer cannot be close to audio cables, video cables, etc., otherwise unnecessary signal interference may occur.

The signal jammer in the examination room is installed in the classroom of the university. It is also necessary to pay attention to the installation height of the shielding equipment. The recommended installation height is between 1.8 meters and 2.5 meters. If the installation is too low, it is easy to be damaged by man. If the installation is too high, there may be incomplete coverage and unsatisfactory shielding effect.

There are two other situations in the university that will seriously affect the effect of the test room signal jammer in the standardized examination room. The first situation is: in recent years, many mobile phone base stations of operators have been directly built on the campus and installed directly in the teaching area. The closer the base station is to the roof of the building or other office buildings, the more it will affect the shielding distance of the signal jammer in the examination room. The second situation is: in the corridor of the teaching building, the operator will install indoor signal amplifiers, and these indoor signal amplifiers are often installed concealedly, such as installed in the ceiling of the corridor.

Many government agencies and important military secrecy units are equipped with gun-shaped drone jammers, which can effectively attack or interfere with illegally intruded drones, so many people want to know that the gun-shaped drone jammers What is the state of the drone after it is driven away?

The gun-shaped UAV jammer actually has a variety of jamming modes, which at least include: UAV driving away mode, UAV forced landing mode, UAV precision strike mode and so on. When the gun-shaped UAV jammer operates in different jamming modes, the operating status of the jammed UAV is different. Let’s answer them one by one.

Drone drive-off mode: When the gun-shaped drone jammer activates the drive-away mode, the purpose is to let the drones that illegally enter the restricted flight area evacuate the area as soon as possible. At this time, the disturbed drone will lose flight control and image transmission signal, then it will immediately turn on the automatic return mode, and will automatically return to the take-off location according to the preset altitude or advanced route.

UAV forced landing mode: When the gun-shaped UAV jammer activates the forced landing mode, the purpose of this mode is to capture or destroy illegally intruded UAVs. The UAV’s flight control, image transmission and Signals such as GPS positioning and navigation will be interfered and lose signal. At this time, drones are like headless chickens. Some of them will land on the spot or even stop in the air and fall directly. Another part of the drone will maintain the flight status of the last normal communication and fly inertially, which will cause the drone to fall to the ground, hit obstacles or fly out of the gun-shaped drone jammer. The area covered by the interfering signal.

Drone precision strike: When the gun-shaped drone jammer activates the precision strike mode, the premise of this mode is that the gun-shaped drone jammer itself has the drone identification function, and it can attack unmanned aerial vehicles UAVs can be identified as friend or foe, and precise interference and strikes can be carried out on UAVs in the unsafe list.