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How effective is the shielding of household signal jammers?

The mobile phone signal shielding system is a relatively professional modern communication signal shielding technology, especially in the special environment of prisons, which puts forward higher requirements on the mobile phone signal shielding technology. For example, in the application environment of the communication signal shielding system of a general meeting, participants come and walk in a hurry, and there is almost no time to “search” for the blind spots of communication signal shielding. In the special environment of the prison, the number of people is dense and the activities are more concentrated. This is the time to use mobile phone signal jammer for shielding.

1. How to evaluate the effect of the cell phone signal shielding system in the prison? If there is no shielding blind spot in the prison, the test should be repeated. In places with strong signals, such as “windows” or “every corners”, professional equipment detectors should be used. , Radiation, and shielding of other systems; to achieve no blind spots; to comply with the inspection regulations of relevant departments

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2. The shielding effect and external shielding?

The high-quality mobile phone signal shielding system project must be completely shielded without affecting the communication of residents, not letting people complain, not allowing mobile and China Unicom to cause trouble, and the shielding area is more accurate, and there is no shielding outside the shielding area, which can be regarded as a complete acceptance project.

3. Problems with upgrading and expansion? The wireless communication technology is developing rapidly. 5G is currently in the trial operation stage. Yesterday, the system could be completely shielded, and there may be problems today. Therefore, the construction of the shielding system should be modularized, and it can be easily upgraded according to the changes of the surrounding communication facilities, so as to substantially save the project investment and achieve permanent shielding.

Factor 1: the effective shielding of mobile phone signal jammer

The efficiency of the so-called cell phone jammer is whether the shielding effect has blind spots or leaks. Near some prisons, there may be sources of strong mobile phone signals. In order to achieve a good shielding effect, a lot of materials and energy will be spent correspondingly, and the cost will correspondingly increase substantially. Therefore, the better the shielding effect, the cost will increase accordingly. In actual use, the shielding requirements of the prison area are generally higher, with a little leakage and blind spots. Some personnel may seize this loophole, so that the mobile phone can be used in the originally prescribed shielding area, which cannot achieve the original intention of shielding the mobile phone.

Factor 2: No malfunction time of mobile phone signal jammer

If the original stipulation that the failure-free service life is 1 year and the failure-free service reaches 3 years in actual use, the cost performance will be tripled. If the original stipulation that the failure-free service life is 1 year, it will often fail in less than half a year in actual use. Although it is a free warranty, the risk is immeasurable, personnel resources are wasted, and the corresponding cost performance is greatly reduced.

Factor three: external shielding of mobile phone signal jammer

If external shielding is not considered, it is relatively easy to simply shield the mobile phone signal, as long as the shielding power is increased. But it is necessary to ensure that the shielding area has no blind areas and no leakage points. The power intensity in the shielding area is relatively large. If there is a little leakage, the external shielding will be large. This requires full consideration and technical control during shielding design to achieve precise and efficient shielding without external coverage.

Factor 4: Cell phone signal jammer cost

The cost should follow the shielding requirements and budget. You can’t blindly choose cheap machines, and you can’t think that expensive is good. In actual choices, word-of-mouth is very important. It is more necessary to investigate past cases on the spot, test the shielding effect, and then make selections.

Explain the function of GPS jammer

When purchasing and using vehicle mortgages, it is best to configure GPS jammer within a certain stage. Especially some car dealers who hand over the car and purchase the mortgaged car, in other words, once they receive the car, they can turn on the GPS jammer and put one in the car, and one in the car trunk! When the shield is turned on, you can be assured of peace of mind when you take the car back and forth. However, the jammer cannot be activated 24 hours a day, so after the safety reaches its own chassis, you must find a technical professional to investigate the GPS by yourself, and modify the GPS positioning equipment and mortise locks, key changes and other security guards to prevent mistakes. just in case.

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1. Understand the GPS jammer
GPS jammers (jammers) can reasonably prevent being tracked by GPS communication satellites, reasonably affect GPS communication satellite signals, and maintain your track privacy protection and information business secrets.

2. The function of GPS jammer
The GPS signal is the same as the signal on the mobile phone, it is very susceptible to the influence of electronic components. The signal jammer can shield all the signals in a certain range, so that all communication devices in the range lose the signal. The installation of a GPS locator on the car enables buyers to easily find their own car on the GPS monitoring management platform. As everyone knows, such a good product is also found by criminals to find loopholes. If you buy a signal blocker on Taobao, Turn on when the car is stolen, there will be no signal in the car, and the car will go offline on the service platform, as if the whereabouts of the car are unknown, you can’t find it anyway.

3. Disadvantages of GPS locator
I have to admit that the GPS jammer also has disadvantages for the user. The signal jammer is only temporarily turned on, and it is unlikely to be turned on all the time. If he turns off the jammer, the GPS locator will have a signal again. Drivers can quickly find the stolen car based on precise positioning information.

In addition to signal jammer, some people will say that they will use signal detectors to find out and destroy GPS locators. Yes, this is also an objective fact, but this is only valid for some GPS devices. If the GPS tracker is in a dormant state most of the time, the signal detector will not be able to detect it! what happened?

For example, some ultra-long standby GPS locators can only be awakened once a day. After being awakened, the precise positioning information of the vehicle is sent back to the buyer’s network platform and then it enters the dormant state. In the dormant state, it is Without a signal, it is absolutely impossible for car thieves to detect it! In addition, it is also free of wireless network installation. There is no wiring on the surface of the machine and equipment. It can be placed anywhere on the car (if it does not have to be placed in an area blocked by the signal). It is very concealed for engineering safety.

Interpretation of the principle of car jammer shielding remote control signal

The reporter learned from the car market that when many car owners use their cars, the theft of their valuables often occurs, and many car owners are puzzled. He obviously closed the door of the car, and the car was not damaged. How come the contents of your car were stolen? Could it be that your car was pried open by the master key? The netizen “Wind Chaser” found out the secret of the theft of car items after detailed research and search for a lot of information.

The netizen “Wind Chaser” told reporters that in fact, the biggest motivation for him to find out the reason is that the two bottles of Moutai in the Mercedes-Benz that he bought were somehow lost. Originally, these two bottles of Moutai were intended to be given to their own leaders. I hope to upgrade myself in the coming year. Moreover, these two bottles of Moutai are authentic, so once they are given to the leaders successfully, there is hope for the upgrade. I did not expect to be stolen. Losing the opportunity to give gifts to leaders made the netizen very depressed.

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It is precisely based on this background that although the netizen also called the police, he could not provide evidence that he did put Moutai in his car and was stolen by someone else, because the car was intact and the case was not filed. What should I do? The netizen can only crack the secret by himself.

Later, the netizen learned about gps jammer and car decoders on the Internet, and finally solved the puzzle. The source of this secret is that the remote control information of the car was interfered by the car jammer, resulting in the car door being not locked at all, and then after the car owner left, those criminals who used the car jammer would have an opportunity to take advantage of it. So simple. In that case, is there any way to crack the illegal behavior of using car jammers?

Car decoder cracks car chip parameters to improve car safety

Many readers may think that since the car decoder can crack the parameters of the car chip, this is a huge challenge to the safety of the car itself. Why does it improve the safety of the car? For this, the netizen “wind chaser” himself has a deep understanding.

After knowing that gsm jammer can interfere with the car’s signal, for the majority of car owners, if they want to prevent the intrusion of car jammers, the direct method is definitely not feasible, and it is difficult to file a case after the products in the car are stolen. Only the dumb can eat coptis. The theft of car products reported on the Internet is actually a fiction when the police find out. How can our police have such a powerful ability?

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Therefore, the complete solution to car jammers is to provide car decoders to crack car chips. Then modify the parameters on the car chip to make the car jammer completely invalid. This method has been proved to be unsuccessful, and now many car repair 4S shops also provide such services. Because car decoders and car jammers are actually like the relationship between computer viruses and security workers, one develops viruses and the other prevents viruses.

After modifying the car chip through the car decoder, the netizen “Wind Chaser” has never lost any items since then. It can be seen that the car decoder can indeed improve the safety of the car. Professor Wang, an expert in the automotive industry, also talked about a point of view, that is, after the car decoder modifies the parameters of the car chip, the car jammer cannot read the data of the car chip, and there is no way to obtain the signal of the chip. It cannot interfere with the remote control function of the car.

This is like adding a protective cover to the car computer chip. The interference signal of the car jammer cannot attack the car chip through this protective cover, thus improving the safety of the car.

Principles of signal jammers in those examination rooms

In the annual college entrance examination and entrance examination, major operators will issue a warm reminder: In order to ensure the smooth flow of signals around the campus, the operators have arranged in advance for communication engineers to test the entrances and exits of each test center and the rest area of the parents accompanying the test, and conduct tests on nearby base stations. Software and hardware expansion to ensure the communication needs of parents in the test area during the test. Except that the signal is blocked during the exam, we have done our best to ensure that your communication is smooth. Every year in the college entrance examination, in order to prevent exam fraud, all communication signals in the examination room will be shielded. There are cell phone jammer in the exam room. Common signal jammers: At the same time, there is a radio monitor outside the exam room that can help fix those frequency bands that the mobile phone jammer can’t take care of. Electromagnetic wave signals, real-time monitoring of radio wave signals from unknown sources.

The working principle of the signal jammer used in the college entrance examination is to obliterate the useful electromagnetic wave signal in a large number of useless signals. Under normal circumstances, when we use a mobile phone, the mobile phone is first connected to the carrier’s base station, and the radio wave signals sent by the two parties come and go. However, when the jammer is turned on, gongs and drums will be beaten around the mobile phone, sending out a noise radio wave signal that is many times larger than the received base station signal power. The mobile phone can’t hear what the base station is talking about and cannot receive the base station’s signals normally. The connection was severed. Whether calling, texting, or other various functions, they are all in a paralyzed state.

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This is why the signal jammer affects the call and Internet access of mobile phone users around the examination room. The working principle of the jammer is as follows: in a certain frequency range, the mobile phone and the base station are connected by radio waves, and the data and sound transmission is completed with a certain baud rate and modulation method. Aiming at the above-mentioned communication principle, the jammer scans from the low end frequency of the forward channel to the high end at a certain speed during the working process. The scanning speed can cause garbled interference in the message signal received by the mobile phone, and the mobile phone cannot detect the normal data sent from the base station, so that the mobile phone cannot establish a connection with the base station. The mobile phone is manifested as a search network, no signal, no service system and other phenomena. Eventually, the mobile phone has no signal and cannot receive text messages or calls.

The current mobile phone signal jammer is full-band. It can shield all the 2G 3G 4G signals, 2.4G WIFI signals and Bluetooth signals under all the three operators of China Mobile, China Unicom and Telecom. Its principle is sent by itself. The frequency interferes with the mobile phone receiving the frequency from the base station and wireless router, so as to achieve the purpose of shielding them.

How to use high-power test room signal jammer

The test room signal jammer has become an indispensable tool in the test room, escorting the information security of the test room. However, if we do not use the equipment correctly, there will be poor results, or even an exam room accident. The following Texin Electronics as a manufacturer will share the correct use of the test room signal jammer.

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1. The effective shielding range of the test room signal jammer will be different in different use sites. This is closely related to the signal field strength on site. The shielding range of mobile phones of different standards may not be the same at the same site;

2. Factors that affect the shielding range include but are not limited to: distance from the base station, orientation, obstacles, the wall material of the site building, the installation height of the shielding device, installation specifications, etc.;

3. Each antenna has a frequency band identification, which must correspond to the frequency band identification on the host one-to-one. Before turning on the high power jammer, ensure that each antenna is connected reliably. It is never allowed to turn on the device without connecting the antenna;

4. The surface temperature of the shield is about 40～50℃ after working for a long time, which is normal. If the surface temperature is too high, please turn off the power and try to contact your local dealer or agent;

5. The normal installation height is 1.8 meters ~ 2.5 meters, try to choose a place where there are no obstacles between the target shielding area. The wall-mounted installation requires the antenna to face up vertically. When placed on the desktop, the antenna can be folded 90 degrees and then up vertically. There should be no AC power lines or other audio and video lines within 0.2 meters of the antenna;

6. During use, in order to avoid possible interference to some electronic equipment, try to keep the distance between 1 and 2 meters above the following common equipment: stereo, wireless microphone, radio, computer, TV, Wi-Fi router, etc.

The current situation and misunderstandings of using mobile phone jammers in prisons

Cell phone jammer Current situation:
1. The area that should be shielded is not strictly shielded, which is costly and laborious and has no actual effect;
2. The area that should not be shielded is seriously interfered, complained and cannot be used normally;
3. There is a gap between overly biased detection and pseudo base station technology, ideals and reality, and there are no real successful cases in China at present;

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2. Misunderstanding:

①Using directional antenna can avoid interference
1. There is a certain transmitted signal strength outside the directional angle of the directional antenna, but it is much lower than the main lobe, not completely directional;
2. The reflection of the building will still cause external interference;
3. The frequency drift of the host computer seriously affects the base station and causes external interference;
4. TD full-time shielding interference must exist.

②The greater the power, the better
1. Inaccurate host frequency output, frequency drift, too wide bandwidth, waste of power, and interfered base station;
2. The simple frequency sweeping power suppression method has low shielding efficiency and large radiation;
3. The power is false standard, exaggerated publicity, and the nominal power loses its reference value;
4. Power is the foundation and technology is the key. It is better to find good methods and skills to fight for power;

③ The radiation of high power jammer is large, and the radiation of low-power is small
1. The high-power uses an outdoor antenna, which has a long operating distance, large shielding coverage, and uniform shielding signals, but radiation is minimal;
2. If the low-power equipment does not use multiple antennas for long-distance shielding, but is arranged in a centralized manner or 5 antennas are used together, the radiation power will be greater than 10 microwatts/square centimeter, and the short-distance radiation will definitely exceed the standard;

What does the price of the signal jammer depend on?

The signal jammer of the mobile phone is rarely used. The places that are often used may only be companies engaged in scientific research. There is also a research and development department on state secrets. The other is the military, where security and confidentiality related areas have set up cell phone signal blockers. It is better to have JAMMER-MART among the signal jammers in your hand. The brand Shenzhou Mingda is also sold at different prices. That’s because their performance is different. Let us look at the price of cell phone signal jammers.

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1. Cell phone signal shielding looks at the price from the power level
The mobile phone signal jammer has its own capabilities. Generally, the greater the power, the greater the range of cell phone signals that can be shielded, and the lower the power, the smaller the range of cell phone signals that can be shielded. Therefore, the price of mobile phone signal converters is also related to power.

2. The price of the signal jammer on the mobile phone is determined according to the main purpose.

We are also very aware of a problem, that is, the price of mobile phone signal jammers is determined according to the purpose. For example, if you buy a school with 5,000 students at a lower price, it is absolutely impossible, because the purpose of shielding cell phone signals is impossible. For example, if you buy an expensive cell phone signal blocker in a small meeting room or a small movie hall, this is not necessary. Because of the small area, we can buy a cell phone with lower power to block the cell phone signal. So according to your own use, decide what type of cell phone signal jammer to buy.

Schools and prisons use mobile phone signal jammers to be safety-oriented

Schools and prisons should follow these three principles when using cell phone jammers

Radio management

The use of mobile phone signal jammers should not be exchanged at the expense of public mobile communications

Among those who use cell phone jammer, some are to prevent cheating in exams, and some are for quietness of the meeting or confidentiality of meeting information. These are all for good wishes and purposes. But there are also for their own benefit. For example, the owner of a public phone may use a jammer to interfere with the mobile communication base station near his business location, so that people working near the public phone operated by him can use the mobile phone instead of working Public telephone calls increase their economic income. In addition, mobile communication operators may also use shielding devices to harm each other’s interests, so that they can gain advantages in certain local competitions in the same industry. In addition, the mobile phone signal jammer is also easy to add software, becoming a veritable eavesdropping

The above list is the purpose of people using mobile phone signal jammers, but no matter what the purpose is, they should not be exchanged at the expense of public mobile communications. In fact, according to research, it is possible to install mobile phone signal jammers without affecting the normal use of public mobile communications. There are three reasons that cause the mobile phone signal jammer to disturb the mobile communication base station signal:

First, users of mobile phone signal jammers did not take into account the communication needs of outsiders at all, and the target was wrong. The mobile phone communication of a small group of people (such as examinees) should be restricted, but the target was expanded to other ordinary people around.

Second, improper use, because the cell phone signal jammer is installed in an improper position or its transmission power is set too large, it should be controlled within a small range but not properly controlled.

Third, the purchased cell phone signal jammer does not meet the approved standards for radio equipment, the power exceeds the standard, or is a low-quality and substandard product. Finding the reason, in order to overcome its impact on mobile communication signals, it is actually very simple: first, use standard products produced by regular manufacturers, secondly, choose the installation location and direction of action, and thirdly set appropriate transmission power. , It is enough to limit the transmitted signal to a small enclosed area. As long as the above three points are achieved, its impact on nearby mobile communication base stations can be minimized.

Improper application of mobile phone signal jammers in schools and prisons may cause unnecessary harm to the human body

Theoretical analysis shows that when the mobile phone signal jammer is working, if the transmission power is too large due to improper setting, in a small confined space such as meeting rooms and classrooms, electromagnetic waves are superimposed in a small space and pass through the walls that are originally separated from the outside. Multiple reflections from the ceiling and the ground will cause people in the room to be exposed to serious electromagnetic pollution. According to the survey, the college entrance examination and the high school entrance examination are the occasions where mobile phone signal jammers are used the most. In some examination rooms where mobile phone signal jammers are used, some parties (the college entrance examination inspectors, examinees and teachers) are irritable and unable to concentrate. Individual examinees Even headache symptoms appear. Various signs indicate that if the transmission power of the mobile phone signal jammer is turned on too large, it will seriously affect the normal thinking of candidates in the examination room.

As we all know, the characteristics of the free propagation of radio waves in the air, mobile phone signal jammers can block mobile communication base station signals in a certain area and achieve their limited purposes, but also harm human health to varying degrees. Therefore, you must use mobile phone signals with caution. Shield.

The functional management department should strengthen supervision and regulate the safe use of mobile phone signal jammers in schools and prisons

Faced with the increasing use of mobile phone signal jammers from all walks of life in the society, functional departments such as the Radio Management and Security Bureau must increase supervision and regulate the use of mobile phone signal jammers

Does cell phone signal jammer affect pregnant women?

1. The signal jammer is aimed at mobile transmitters and has no effect on the human body.

jammer signal device Powerful

2. The mobile phone signal jammer scans from the low end frequency of the forward channel to the high end at a certain speed during the working process, which can cause garbled interference in the signal received by the mobile phone. The mobile phone cannot detect the normal microwave signal data sent from the base station. In the range, the mobile phone cannot establish a connection with the base station, so as to achieve the purpose of banning the mobile phone. The mobile phone is manifested as a search network, no signal, no service system and other phenomena.

3. The mobile phone signal jammer only shields the mobile phone signal without affecting other electronic equipment and is harmless to the human body.

4. The radiation of the mobile phone is similar to that of the previous radio. Generally, the mobile phone has relatively large radiation only when making a call. In fact, pregnant women should be fine as long as they pay a little attention. The larger radiation is actually some electrical equipment at home, such as Said induction cooker air conditioner or something

Can a mobile phone signal jammer shield 4G signals?

Today, I will talk to you about whether the mobile phone signal jammer can effectively shield the 4G network signal? This topic will help everyone have a more comprehensive understanding of the signal jammer. Next, the editor summarized a few pieces of knowledge about mobile phone signal jammers.

1. In addition to the 4G network signals that have been widely used, the commonly used mobile communication network signals include the 3G network signals that were popular in the past few years, as well as the 2G network signals used by some elderly phones. Although 5G network signals have become a topic of discussion by many people, it will take some time before they can reach 5G networks.

2. The first thing to be clear is that the mobile phone signal jammer can shield 4G network signals. When the mobile phone is operating in a certain frequency range, the mobile phone and the base station are connected by radio waves, and the transmission of data and sound is completed with a certain baud rate and modulation method. Aiming at this communication principle, the mobile phone signal jammer scans from the low-end frequency of the forward channel to the high-end at a certain speed during operation. This scanning speed can cause garbled interference in the message signal received by the mobile phone, and the mobile phone cannot detect the normal data announced from the base station, so that the mobile phone cannot establish a connection with the base station. The mobile phone is manifested in the phenomenon of searching the network, no signal, no service system, etc.

3. The key to shielding 4G network signals depends on the frequency supported by the selected mobile phone signal jammer. The current 4G frequency range is very wide, from 800M-2. 4G, if you want to shield 4G signals, it depends on what you use for shielding. How much bandwidth can the device support? Because some of the 4G frequency band almost overlaps with WIFI 2.4. Once you shield the 4G signal, the WIFI and Bluetooth in the shielded area may not work properly. Therefore, whether the 4G signal can be shielded depends on the function of the shielding product, whether the device has a 4G signal shielding module.