Author: 897918909@qq.com

During the consultation process of customers communicating with us, the price of products will always be a concern for customers. In fact, there must be differences in the prices of different network jammers. The pricing standards of products are not only closely related to the functions and technical indicators of the equipment, etc. In addition to being relevant, the main components of the device itself are also important criteria for pricing. So, what are the main components included in the price calculation cost of the network jammer?

No matter which mobile phone shielding equipment it is, its main components must include: equipment appearance casing components, heat dissipation components, radio frequency module components, power supply components, and antenna components. Next, we describe each component one by one.

Equipment appearance casing components: This refers to the casing of the network jammer, as well as the casing assembly structure, accessories, etc. It is the most intuitive visual perception of the equipment by customers. At present, most of the mainstream shielding equipment use plastic mold shells as appearance components;

Heat dissipation component: This is the component with the largest weight of a network jammer. Generally, metal aluminum products with dense heat dissipation fins are used as the main body of the heat sink. In order to enhance heat dissipation performance, some shielding products may also increase heat dissipation. fan;

RF module components: This is the hardware core of the network jammer. In the current mainstream network jammer price calculation, this part alone accounts for about half of the proportion. In the RF module assembly, according to different mobile phone frequency band requirements, it usually includes at least 10-12 groups of signal sources and power amplifier devices. Among them, if it is a conscientious manufacturer, using a brand-new signal source and power amplifier device will increase the price of the network jammer, but it can ensure the stability and reliability of the shielding equipment.

Power supply components: It is usually a switching power supply from a regular power supply manufacturer. Because there are many manufacturers of switching power supply, the quality of the power supply provided is also quite different, and the cost price also has a lot of room for fluctuation.

Antenna components: The unit price of the antenna is not high, but since each shielding device needs at least 10-12 antennas, the total price of the antenna still has a certain share. Moreover, in the price calculation of network jammers, the antenna part is also an easy part for unscrupulous merchants. For example, some copper wire springs are used to replace the standard antennas. Although this reduces the price, the product quality will inevitably decrease.

During the installation and debugging of the mobile phone jammer, are all mobile phone signals on site completely jammed? What is the effective range of the interference signal coverage? These problems are all problems that engineers need to face and analyze during construction. When the mobile phone jammer misses the signal, that is to say, some mobile phone signals are not completely disturbed, even if the jamming device is in the state of interference, it is very far away from the device host. At close distances, some mobile phones can still answer or make calls, or can still browse websites and transmit data on the Internet. So, how to analyze and judge the sources of these missing signals?

If there are professional technicians from the mobile phone jammer manufacturer on site, they usually carry a portable spectrum analyzer. With the help of the spectrum analyzer, the technicians of the manufacturer can preliminarily determine which frequency band is by observing the spectrum waveform of each mobile phone frequency band. A missing signal has occurred. However, there are exceptions. For example, the signal strength of the base station is only slightly higher than the signal strength of the mobile phone jammer. At this time, it is difficult to distinguish which mobile phone frequency band has the missing signal from the frequency band waveform. When encountering such a scene environment , Is there any good way to find out which mobile phone signal frequency band has the problem of missing signal?

There is really a simple and practical method, which is to download an APP software on the tested mobile phone, the name of the software is: Cellular-Z. After the software is installed, start the “Cellular-Z” software, then turn on the mobile phone jammer, take the mobile phone to the predetermined test point that needs a certain distance from the jamming device, and then carefully observe the display interface of the software, focusing on one column marked “” NR-FREQ”, if the displayed content shows a specific frequency value, then the corresponding missing mobile phone frequency band has been found. If the value of this position is empty, it means that the tested mobile phone is completely disturbed.

Nowadays, all kinds of wireless  jammers emerge in an endless stream, but no matter what kind of renovation, the multi-band signal jamming module in its core components is indispensable. After assembling the signal jamming modules of several frequency bands, accurate It will be a very important height step to adjust the center frequency point, frequency offset and bandwidth of each module. So, what are the precautions for the production and debugging of such multi-band wireless jammers?

Compared with wireless jammers ten years ago, especially for the types of mobile phone signals, there are not as many mobile phone systems as there are now. At that time, there were only two kinds of mobile phone signals, 2G and 3G, and the mobile phone frequency bands used were also different. Only need 4 or 5. At that time, the workload of debugging an interference device was relatively small, and technicians usually only needed to adjust the four or five interference modules one by one. The debugging process is also very simple. Generally, only two adjustable potentiometers are needed to adjust the frequency offset and bandwidth for each interference module.

Then, the current wireless jammers no longer only include four or five jamming modules to achieve the jamming effect of all signals, but usually include at least 10 or even close to 20 jamming modules. When a multi-band wireless jammer has such a large number of jamming modules at the same time, it becomes time-consuming and laborious to debug and calibrate each module, and there are also many unexpected effects.

When the technicians debug the frequency of each wireless jammer module one by one, each time one is completed, the setting parameters on the debug instrument need to be reset for the next frequency band. In this way, it will take a long time to debug a wireless jammer. . And embarrassingly, after debugging several frequency bands, if you go back to check the module that has just been debugged, you will find that the actual output frequency of the module has some deviations. This requires calibration and tuning again, and so on. The reason is that there are too many frequency bands, there is signal interference between multiple frequency bands, and there is also the reason why the frequency output changes due to the voltage change of the power supply board.

In view of the above problems, we have concluded that the most ideal solution is: according to the number of frequency bands of multi-band wireless jammers, use an equivalent number of spectrum analyzers, and customize a special equipment debugging test bench, one-time To perform signal debugging for multiple frequency bands at the same time, technicians can visually observe whether each interference module meets the correct debugging parameters through the waveform display on multiple spectrum analyzers while adjusting the frequency.

The use of drone jammer systems to defend against black flying or illegal intrusion of drones has become an important safeguard measure for many secret places, key military departments and key protected areas. The units that need to be protected, the drone countermeasure equipment purchased and installed comes from various manufacturers, and the models and specifications are not the same. Then the problem is coming. There are a large number and variety of drone interference. Is the effect of the drone system the same for all kinds of drones?

All defenses against drones mainly include: 1. drone detection and identification, 2. drone expulsion, drone forced landing (or drone strike). What we are discussing here is mainly the case of category 2.

The key point of the drone jammer system is to jam the drones that have been discovered, and this jamming effect can be to drive the drones away from their own area. It can also be forced to land or captured directly. When we talk about the effect of interference, we usually mean the effective working distance or working radius of the interference.

The specific analysis of the interference effect should be carried out from two aspects: the first is the performance index of the drone jammer system itself, which includes the wireless communication frequency bands commonly used by drones covered by its interference signal, and also includes various signals. The transmit power of the jamming module, and at the same time, the directional antenna or omnidirectional antenna it configures determines the quality of its jamming effect. The second point is to analyze from the perspective of drones, because the drone market is now prosperous, commercial drones for civilian use can be said to be inundated, and drones of different brands, models and functions emerge in an endless stream. The performance indicators between these drones are very different, not only the difference in communication frequency bands, but some drones have enhanced anti-jamming capabilities, and there are even some privately modified drones that enable some unconventional Communication module, and try to increase the power of the transmitter and receiver module of the remote control of the drone. This is a bit similar to the relationship between the spear and the shield. They are compared with each other. The biggest reason that affects the results of the test is to see who is launching The higher the power, the stronger the anti-interference ability.

Based on the above analysis, we can conclude that the effect of the drone jammer system on various drones will definitely not be exactly the same. The update iteration of drones is very fast, and the drone jammer system must also follow up gradually. This is bound to be a mutually progressive and mutually competitive process.

In the process of consulting us about high-power jammers, some customers often put forward a more intuitive performance index requirement, that is: in the outdoor environment, the distance of shielding the mobile phone signal should reach 50 meters, or one more Level, the distance required to shield mobile phone signals reaches 100 meters. From the customer’s point of view to analyze such requirements, the customer’s understanding is that since the required shielding distance is doubled, the power of the corresponding high-power jammer should be almost doubled. It can also be inferred that the corresponding equipment cost must be There is a big gap, so, is the final conclusion really true?

The unfortunate result is: the ideas of these customers do not match the reality. In the outdoor environment, the effective distance for shielding mobile phone signals, the nominal distance of 50 meters and 100 meters, is actually not very different. Even for our high-power jammer manufacturers, products that meet the requirements of this index, We group it under the same indicator range.

Shielding mobile phone signals is based on various mobile phone signal shielding equipment. According to the classification method of power, we generally divide them into three categories: low-power, medium-power and high-power. Among them, the low-power type means that the transmit power of each shielding module is about 2-3W, and the main use is in the indoor environment. The medium power type means that the transmit power of each shielding module is about 10-20W, and the high-power type means that the transmit power of each shielding module is above 50W. Both the medium power type and the high power type are used in outdoor environments.

When used in an outdoor open environment, although the nominal distance of medium-power jammers sometimes exceeds 50 meters, in practical applications, due to the influence of the distribution distance of surrounding base stations, they often block mobile phone signals. The distance will be less than 50 meters, and the normal performance is about 20-30 meters. If you want to ensure that the distance of shielding mobile phone signals can reach more than 50 meters in most use cases when used outdoors, you must use a high-power jammer with a module power of more than 50W.

We also need to point out that: when evaluating the distance of shielding mobile phone signals, the value of the distance can only be a relatively broad approximate value, or a macro value, it cannot be very accurate, and the shielding signal is transmitting During the process, it is impossible to precisely locate a certain position. For example: When the shielded signal is transmitted around, its characteristics are somewhat similar to a loud shout. When the sound is transmitted to the outside world, it is definitely unlikely that the sound can be transmitted to a certain specified distance very accurately.

When some customers ask us about signal jammers, they will put forward the following requirements according to the needs of the application scenarios: the product needs to be portable, preferably in the style of a suitcase, can be turned on at any time, can be used at any time, and can use the built-in battery powered without the need for an external AC power source. As a manufacturer, in order to meet these functional requirements of customers, we have specially tailored suitcase-type shielding equipment. Then, the customer’s subsequent question comes out: How much range can a mobile phone box-type signal jammer cover?

According to the customer’s initial idea, the appearance of this suitcase must not be too large and the weight should not be too heavy. Therefore, the selection of suitcases is limited to a certain extent. Usually, its appearance and size can only be similar to common briefcases. The weight must also be controlled within 10Kg. After the size and weight limits are set, let’s analyze: what essential parts must be installed in the suitcase.

The first essential is of course the host of the signal jammer that acts as a signal shield, as well as the radiator and cooling fan that provide fast heat dissipation for the host. The second is the battery that provides power for the signal jammer. If the AC and DC switching power supply modes are also required at the same time, the installation of a switching power supply must also be considered. The third important component is the antenna that transmits the shielded signal, and the antenna is also divided into an omnidirectional antenna or a directional antenna according to the requirements of use.

It can be seen from the above analysis that a suitcase-type signal jammer is limited because of the limited space in the box. If so many important components are installed in the box, even if the components are arranged very compactly, it is still limited. Only in the suitcase, must not install the ultra-powerful signal jammer.

How do I know the coverage of a suitcase-style signal jammer? This is closely related to the transmit power of the shielding module used inside. According to the current design of our manufacturer, the transmit power of a single module that can be installed in a suitcase is generally between 10-20W. According to the test data, a signal jammer with a 20W power amplifier is used. If it is used with an omnidirectional antenna, in a standard test environment, its coverage radius is usually between 40-60 meters. If it is replaced by a directional antenna for testing, the signal shielding distance of the suitcase-type signal jammer is generally between 50-100 meters in the main direction of the directional antenna.

Every year, various types of examinations are carried out in an orderly manner. As an important safeguard to maintain the fairness of examinations, examination room-type jammers will be applied in these various examination processes. Each examination supervisor will also invest special funds year by year to purchase or upgrade the signal shielding equipment in these examination rooms. Then, some customers have questions. Why do they feel that the price of the test room-type jammer seems to be relatively cheap, while the price of the high-power shielding device with basically similar functions is much higher?

As a professional manufacturer of such products, we will analyze the reasons in detail:

The factors that determine the price of the product mainly include: the cost of the electronic components of the product itself, the assembly and process cost of the product, the batch output of the product, and the reasonable profit and tax of the product.

Corresponding the above to the production cost accounting of the test room-type jammer, the cost of the electronic components of the product itself is mainly reflected in the design of the electronic circuit and the selection of electronic components, which accounts for about three of the product price. one part. The assembly and process cost of the product mainly lies in the process of manual assembly, testing and debugging, which also accounts for about one-third of the total product cost.

If you want to make the test room type jammer cheap, you must have a certain production output. For example, every time we produce a batch, we carry out unified procurement of production materials according to the quantity of 1,000 or 2,000 units. Only when the purchase quantity of this order of magnitude is reached, the supply unit price of various electronic components can get a relatively favorable price. Moreover, in mass production, the scheduling of production line workers and the rational distribution of various processes can maximize work efficiency. This also minimizes labor costs.

It is precisely because of the large output, fast production cycle and low cost of bulk procurement of electronic components that the test room type jammer can ensure its relatively cheap price. Compared with high-power shielding equipment, due to the low output, the stocking cost of electronic devices is not as good as that of low-power models. The characteristics of small-scale mass production and assembly also determine its slow production cycle and relatively high labor costs. 

The main function of the mobile phone signal jammer is to interfere with various 2G, 3G, 4G, 5G and other signals of the mobile phone. Within the range of its effective interference radius, all the mobile phones will behave as follows: the mobile phone shows no signal and cannot make calls. Or answer calls, cannot send or receive short messages, cannot use data traffic to access external networks, and so on. In addition to these direct performance results. In fact, some mobile phone signal jammers will also interfere with the base station to a certain extent. The question arises: which frequency bands are the interference to the base station mainly aimed at? Is there a way to eliminate this interference?

There are actually several types of mobile phone base stations of operators, which are divided according to the working frequency bands of each mobile phone system. Among them, the working frequency band of TDD-LTE is obviously different from that of other mobile phone systems. The TDD-LTE standard is a time-division duplex working mode. In the frequency band assigned to TDD-LTE, there is no dedicated frequency band for uplink signals and downlink signals. That is, in this frequency range, the base station is processing data services. , using the time division method, one time period is dedicated to processing uplink signals, and the next time period is dedicated to processing downlink signals. Since TDD-LTE has no frequency band distinction between uplink signals and downlink signals, this leads to the fact that mobile phone signal jammers can only cover the entire frequency band indiscriminately when interfering with the TDD-LTE frequency band.

When the mobile phone signal jammer is turned on, the nearby base stations will receive a certain degree of interference. If there are not many jammers at the same time, the interference to the base station will not be too great, but if dozens or even hundreds of jammers work at the same time, the base station will not be able to bear it.

At present, the frequency bands of mobile phone base stations using TDD-LTE include: 1880-1920MHz, 2010-2025MHz, 2300-2390MHz, 2515-2675MHz, 3400-3600MHz, 4800-4960MHz. If you want to completely avoid interference with the working frequency bands of these base stations, there is no way. That is to add a time slot synchronization module to the mobile phone signal jammer for the frequency bands that use the TDD-LTE system just listed, so as to work synchronously with the time when the base station processes uplink and downlink data.

In the process of receiving customer inquiries, we found that some customers often confuse mobile phone jammers with recording jammers. Some people’s needs are obviously to limit the use of mobile phones, but they think that only need to block the voice function of mobile phones can achieve Purpose. Another part of people’s functional requirements are anti-monitoring and anti-stealing recording, but they think that they only need to block the mobile phone signal to achieve their goals. So the question is, what is the difference between a mobile phone jammer and a recording jammer? Are the functions of the two similar?

First of all, we can give a very clear answer: mobile phone jammers and recording jammers are not the same type of product. The technical principles and functions of these two products are very different.

What is called a mobile phone jammer in the conventional sense is actually a more accurate name: a mobile phone signal jammer. It refers to the application of messy and disorderly interference signals, that is, white noise, on the corresponding frequency bands of all mobile phone systems, and suppresses the interference through power, so that the normal communication between the mobile phone and the base station cannot be established normally due to interference. Connection, the final performance is that the mobile phone has no signal and no network. The impact of the mobile phone jammer on the mobile phone is to make the mobile phone lose the function of communicating with the outside world, voice calls and data transmission, sending and receiving text messages and other functions, but this does not mean that the mobile phone becomes a waste brick, except for external communication. Functions, the phone’s original recording, photographing, video recording and other functions can still be used normally.

The working principle of the recording jammer is completely different from that of the mobile phone jammer. It does not use the method of transmitting wireless interference signals, which belongs to the application category of the acoustic field. The application scenario of using the recording jammer is also relatively simple, and the target is also very clear, that is, to shield all sound collection devices such as pickups within a relatively short distance, and electronic devices with the functions of pickups and pickup microphones There are many products, in addition to mobile phones, it also includes voice recorders, recording pens, microphones, walkie-talkies and so on.

Let me briefly talk about the biggest difference between a mobile phone jammer and a recorder: the mobile phone jammer only shields the mobile phone signal and limits the conversation and communication of the mobile phone. Once the mobile phone jammer is turned off, the original external communication function of the mobile phone will be restored. The stored data, including video data, etc., can also be transmitted or sent externally. The function of the recording jammer has a certain destructive effect. It can make the recording device unable to collect effective sound. Even if it has a local storage function, the stored sound has lost its ability to be read.

Customers who know something about 5G jammers will find that the most conspicuous part of a signal shielding device is the large number of antennas. These antennas are arranged in a line. Although they are not too messy, they obviously take up a lot of space. Even if it is a 5G jammer with a built-in antenna, the space occupied by the antenna is almost half of the internal space of the entire device. Then the customer’s question comes, why doesn’t such a low-power 5G jammer use a combiner to combine all the antennas before outputting?

The reason why customers have such doubts is that they want to reduce the number of antennas, thereby further reducing the size of the 5G jammer and making the device more portable. However, the idea is beautiful, but the reality does not develop completely according to the idea.

Although the large number of antennas seem to have the same length and diameter, in fact, this is just a unified shell of the antennas. If you pull out the rubber sleeves outside the antennas, you will find that the cores of each antenna are There will be obvious differences.

The core length of the antenna is closely related to the standing wave frequency of the antenna, and the standing wave frequency directly corresponds to the working frequency of the antenna. If the frequency deviates, it will directly affect the output of the shielded signal in this frequency band. Nowadays, a 5G jammer usually has more than 10 antennas, which means that the 5G jammer includes at least 10 mobile phone frequency bands. It should be noted that the frequency bands of these mobile phones are definitely not in the same frequency band with each other, so the cores of the antennas corresponding to them must have different lengths.

Going back to the question raised at the beginning, can these antennas of different frequency bands be combined and output? It is possible to analyze theoretically and practically. In reality, there are indeed a small number of such applications. For example, through a two-in-one-out or three-in-one-out radio frequency signal combiner, after combining the signals of two or three frequency bands, a Antenna output. However, there are two prerequisites for adopting this method. The first is to be able to accept the increase in cost, and the increased cost is often several times higher than the cost of a low-power mobile phone 5G jammer. The second premise is: you cannot expect to combine all the antennas into one output, because even if the technical indicators of the combiner can meet the requirements, the indicators of the antennas that are finally used for output must not meet the standards. If all the working frequency bands of the 5G jammer are arranged, it can be seen that the initial range is at least from 700MHz to 3600MHz, so the difficulty comes out: for an omnidirectional antenna with a frequency span of 3GHz, the standing wave frequency needs to meet 700-3600MHz Is there such an antenna? The result is regrettable, and it is obviously unrealistic to realize such a large bandwidth.

5G jammers have up with the advent of the 5G era, and various styles of 5G jammers on the market are already in sufficient supply. With the replacement of the original 3G and 4G shielding equipment many years ago, many customers have also completed the upgrade and replacement work for their units. But even in the process of upgrading and upgrading, there are also a lot of customer feedback information to us, the main meaning is that in some places after the replacement of new equipment, the shielding effect of 5G is obviously not the same as that of the previous 3G and 4G era. . The customer’s question is, why do some sites show poor shielding effect? What are the ways to improve the shielding effect of 5G jammers?

First of all, we need to understand the current development of 5G. According to the public technical information and data released by various operators, the power of today’s 5G communication base stations is much higher than the signal strength of the previous 3G and 4G base stations. 5G uses high-frequency frequency bands greater than 2.5GHz. A major feature of the high-frequency band is that the bandwidth used is wider, but the diffraction capability is weak and the relative transmission distance is shorter, which further leads to a much higher construction density of 5G base stations than before.

It is precisely because the transmitting power of 5G base stations is now higher and the distribution density of 5G base stations is tighter. Although it allows mobile phone users to get a very stable and reliable 5G experience, it does increase the difficulty of 5G signal blockers for 5G mobile phones. . This is why some customers clearly feel that the current shielding effect is not as good as before.

So what are the ways to improve the shielding effect of 5G jammers? In fact, signal shielding is also power suppression. The result of the effect depends on the size of the power. The quality of 5G mobile phone signal shielding depends largely on the strength of the transmission power of the shielded signal. Therefore, customers can appropriately request 5G jammers Manufacturers, as far as possible to ensure or increase the transmission power of the 5G frequency band, this step is required. Furthermore, when choosing a 5G jammer, you must carefully understand how many 5G shielding modules the device is actually equipped with. Relatively speaking, the more shielding modules for 5G and the more detailed the frequency division, the final shielding effect. The more it can be improved.

If the customer eventually encounters that the shielding effect cannot be achieved no matter what, there is a last effective way, which is to customize the high-power shielding module for the 5G frequency band from the manufacturer of the 5G jammer.

As the 5G jammer follows the development of 5G simultaneously, it has already been recognized and used by the majority of users. However, unlike the previous 2G, 3G, and 4G eras, the vast majority of shielding devices in the 5G era no longer use the appearance of external antennas. Almost all manufacturers use 5G jammers in unison. The antenna and the main unit are all built-in assembly methods. This way, in addition to making the device have an overall aesthetic appearance, more importantly, since several 5G frequency bands have been added, the corresponding shielding modules also need to be increased accordingly. If the original 2G, 3G , 4G frequency band modules, the total number must exceed 10. With such a large number of modules and antennas, it is undoubtedly a good choice to use an integral package to cover all the components inside the case.

However, if all the key components of the 5G jammer are built and hidden, the most intuitive impact will be brought about. Customers will not be able to quickly tell how many shielding modules are used in this device. They do not know the number of modules and have no way to evaluate them. And analyze how the frequency band of this shielding device is divided.

The final shielding effect of the 5G jammer is closely related to the frequency band division and the number of modules of the shielding device. When the 5G era has not yet arrived, the shielding equipment at that time was more conventional and reasonable in the number of frequency band divisions was 8. When 5G comes out, based on our mainland China’s 5G frequency band division standard, at least 700M frequency band, 3400M frequency band, and 3500M frequency band need to be added. In addition, the TDD-LTE frequency band originally assigned to China Mobile’s 4G will be expanded from 2555-2655MHz It becomes 2515-2675MHz, and the bandwidth is increased from the original 100M bandwidth to 160M bandwidth. In order to ensure effective shielding for this frequency band, our suggestion is to split the frequency band into two, and the coverage bandwidth of each module It is advisable not to exceed 100M.

Based on the above analysis, it can be seen that the number of reasonable frequency band divisions for 5G jammers should be 11-12.