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How to crack the working principle of the mobile phone signal shielding device in the college entrance examination examination room?

There are generally two ways to block cell phone signals:

One way is the same as the principle of closed-circuit television. Put the mobile phone in a metal mesh bag, and in principle all electromagnetic waves will be shielded.

Another is that if you walk into an area, the mobile phone will have no signal. This is because there is an electromagnetic wave transmitter in the area. Its frequency is the same as that of the mobile phone. The signal it emits interferes with the signal of the mobile phone.

The cell phone jammer currently on the market work in accordance with the second method. In fact, the principle is very simple, but private use of this frequency band is illegal and cannot generate commercial value, but now schools are starting to use it to prevent cheating. Let’s take a look at its working principle.

When the mobile phone is working, it is within a certain frequency range. The mobile phone and the base station are connected by radio waves, and the data and sound transmission are completed with a certain baud rate and modulation method. In response to 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. 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.

How to crack?

First of all, I feel shameless about this title because it has no solution. I am actually telling everyone how to avoid it?

Method one (very silly and shameless): When entering the examination room, secretly turn on the shield while the teacher is not paying attention. At the beginning of the exam, the teacher will habitually turn on the shield, because the shield itself is turned on, so… it will be turned off!

Method two (luck): WIFI, WLAN unlimited local area network functions only available in smart phones, turn on wifi, wlan and other devices, search-connect-confirm-enter the password (default password 12345678). According to experience, all routers like to use the wifi password The setting is the same as the username, you know. (Because many jammer products in the market do not shield and interfere with the 2.4G frequency band of WIFI)

Method three (tips): When the mobile phone has no signal, click Settings-Network-Network Selection-Manual-Searching Network-Select Network (China Mobile/China Unicom/China Telecom) Speed select the type of card you use, speed exit, so Short-time signals can be obtained. This method consumes more power because it needs to search the Internet.

The conference hall shields the mobile phone signal, this can have

Some cadres complained that during a meeting, the conference hall would turn on the mobile phone signal jammer to block the mobile phone signal. Once they entered the conference hall, they were completely “lost” and were very uncomfortable. Some people think that this is “a delay”, saying that they have been complained by the masses because the mobile phone cannot be reached. Some people even directly asked: Is it necessary? Have a meeting and leave the phone temporarily, is it really that serious? Nowadays, the mobile phone has become an “external organ” of modern people, regardless of whether it is on the way to work, at work, or at a party, it is in the state of “people do not leave the machine, the machine does not leave the hand”. The latest survey shows that Chinese people look at their mobile phones for an average of 3 hours a day, making them the second most addicted person in the world.

portable wireless signal jammers

People’s attention is severely distracted, time is cut into fragments. Not to mention the whole time of a meeting, even if it is more than ten minutes without looking at the phone, many people are not at ease. Some netizens describe that the most painful thing today is not “the distance between life and death” but “the phone has no power, no internet, no signal.” In a conference that should be serious and efficient, we are also used to seeing too many “head down landscapes”: he is using his mobile phone when setting up work on the stage; he is using his mobile phone to convey the spirit on the stage; Cell phone. Really busy managing everything, can’t stop for a moment? Closer to see, there are not many electronic offices. Most of them are browsing Moments, or even visiting online stores and playing games. If you want to portray these people, it is more appropriate to “read only the mobile phone screen and ignore the meeting.” Of course, it is difficult to put into the meeting agenda with such a deliberate and absent-minded participation.

From this point of view, cell phone jammer for meetings are not necessary, but necessary. Compared with the small probability event of cutting off the network cable and “delaying work”, the negative effects of playing mobile phones are much greater. We often talk about holding useful and efficient meetings. The “useful” and “efficient” here mean that the content of the meeting must be free from formalism and less idioms in Mandarin. At the same time, it should also include the attendees, heart, and brain. If all of you here are “people sitting in the meeting place and their hearts floating on the Internet”, the meeting will be reduced to another form of formalism. If we are opposed to meetings for the sake of meetings and emphasize on solving practical problems, then we should also be wary of perfunctory participation attitudes, and we should also restrict mobile phones from “buzzing” and “didi” disturbing people’s minds. “If you have a problem, hold a meeting and put it on the table to discuss.” “Large meetings, medium meetings, and small meetings are all necessary.

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.

gps signal blockers

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.

We have solved the four major methods of cracking the signal jammer

Four ways to crack the school signal shielding! Don’t worry about exams

First declare that our company has completely solved this problem!

Method 1: Number segment cracking method

The school uses an older signal jammer that can only shield the old number segments of PHS, China Mobile, and China Unicom, such as the new Telecom Tianyi 186, China Unicom’s Wo number segment and China Mobile’s TD-SCDMA etc. number segment. of! Simply put, the China Unicom and China Mobile numbers beginning with 13 15 and all PHS numbers can be blocked! The beginning of 18 will not be blocked!

jamming signal

Method 2: Band cracking method

Because the school’s cell phone jammer works to shield the mobile phone by interfering with the mobile phone signal of the designated band, so long as the mobile phone’s receiving transmission frequency can be modified to prevent it from being shielded, the jammer can only shield the mobile phone signal of 900—1800MHZ, and the mobile phone The receiving and transmitting frequency of 850-1900MHZ is much larger than the shielding range of the jammer, so as long as the receiving and transmitting frequency of the mobile phone is adjusted to the maximum in the mobile phone settings, the mobile phone signal can be received normally.

Method 3: wifi cracking method:

This method has high requirements for mobile phones and the environment, but the effect is the best and most concealed. The premise is that the mobile phone must have wifi wireless Internet access function and there must be an available wireless network around (it is almost impossible in our first high). After searching and successfully connecting to an available wireless network with your mobile phone, you can still surf the Internet even if your mobile phone has no signal and no traffic. At this time, if you want to find the answer you can’t find, you can use Baidu. If you want to send the answer, you can use QQ. Row. A method of hyper perversion.

Method 4 Bluetooth cracking method:

It is suitable for students with a distance of no more than 50 meters to pass answers to each other. It is also possible to test two adjacent classrooms by myself. Install bluetooth software like bluetooth hacker on the mobile phone, and then both sides turn on the bluetooth visibility. In the software option, there is an option to force the message to be sent via bluetooth. Enter the answer and force it to be sent, and all bluetooth mobiles that turn on the visible bluetooth will accept To the answer, one person sends the whole class to share. The above method is a method that I came up with after several days of meditation. It is dedicated to all the students in a high school who are distressed by the signal being blocked. I hope that using the above methods can liberate students from the abnormal school and get relaxed and happy!

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.

car gps anti track blocker

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?

handheld gps jammer

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.

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.

wireless network jammer Buy

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.

What are the advantages and application prospects of the mini wifi signal jammer?

I want to cut off the WiFi and Bluetooth signal and no one else knows that you cut off the signal. Any good idea will help to achieve the goal? Now the answer is of course to only use the hidden mini Bluetooth jammer. It’s just here. It can provide you with an unmissable opportunity to obtain high-quality mini wifi jammer.

Although there are many handheld WiFi bluetooth signal jammers on the market that can block WiFi bluetooth signals, it seems not so easy to find a hidden style, but only in this channel you will gain access. Take a look at the hidden mini Bluetooth jammer, it has the features you need. Then, just look at the details of this “mini handheld WiFi jammer with built-in antenna” as shown below.

portable gps jammers

This mini jammer is only used to interfere with 2400-2500MHz WiFi Bluetooth signals, with an output power of 0.5W. The output power of this handheld WiFi Bluetooth signal blocker is not strong, but due to the use of ultra-high frequency and micro-power interference technology and high efficiency, the effective interference range of this hidden mini Bluetooth jammer can reach 20 meters.

And according to the palm size design, whether you want to hold the hidden mini Bluetooth jammer or just put it in your pocket, you can easily reach your goal. In addition, because the car charger is also equipped with this hidden mini Bluetooth jammer, it can also be charged when people are driving.

The security of important meetings is inseparable from the strong support of mobile phone signal jammers

Cell phone jammer maintains a good environment for important meetings

We are tired of being interrupted, especially in important places, I am tired of ringing the phone. When the leader presided over an important meeting and was interrupted by the ringing of his cell phone, he was very angry. In order to make the meeting have a good communication environment, use mobile phone jammers in the meeting room.

With the popularity of mobile phones, mobile phone ringtones make people more tired, especially in some quiet public places. In many places, the use of mobile phones is prohibited, because the use of mobile phones will affect others and affect their rest or work. Although there are clear instructions to prohibit the use of mobile phones, many people use them in these places, such as gas stations, because it is dangerous to use mobile phones at gas stations and may cause an explosion.

We should know that important national conferences will last for many days. The content of the meeting must be kept strictly confidential, cannot be interrupted by the outside world, and the use of mobile phones is prohibited. This is not just a national conference, but also many company meetings have adopted cell phone barriers, prohibiting the use of cell phones and gradually installing cell phone barriers. What do you think about the rationality of installing mobile phone jammers in the office?

Not only is the use of mobile phones prohibited at gas stations, but many public places have also begun to prohibit the use of mobile phones. It may also be banned in certain private places. We have heard of the use of cell phone jammers in schools and cell phone jammers in prisons to disable cell phone signals and protect prison safety. How about the meeting room? Have you seen any examples of this? As people become more and more dependent on mobile phones, many companies have begun to install mobile phone jammers in the meeting rooms. And adjust the mobile phone interference range in the conference room. This will not affect the normal use of external mobile phones, and will provide a quiet meeting environment for the meeting.

If the ringing of the mobile phone interrupts the speaker’s thinking in an important meeting, it will make him feel uneasy and distract the meeting participants. It’s impolite to ring an important mobile phone in the meeting room. Therefore, before the start of many meetings, it prompts that the mobile phone will be turned off or set to mute. Many companies do not allow mobile phones to participate in meetings. This is visible in mobile phones in the Internet age The use of will become more and more clear, prohibiting supervision.

portable wireless signal jammers

If you are part of a meeting, how often do you hear your cell phone ringing during the meeting? I think you will be as angry as I am, dissatisfied with this behavior, and even scold the owner of the phone. This is an unhappy ending, not what we want to see. In order to avoid such unpleasant results, it is necessary to use a mobile phone shield in the meeting room. There are many advantages to using it in the meeting room. As you can see, uncivilized phenomena are prohibited. It not only prohibits the use of mobile phone ringtones, but also prohibits the use of mobile phones during this period.

If you are a boss and you often need to participate in meetings, the meeting always has mobile phones ringing or someone looking at the mobile phone, then you can install a mobile phone signal jammer to prohibit them from using their mobile phones.

What is a GPS jammer? Are GPS jammers generally used in cars?

What is a GPS jammer?

The GPS signal jamming system is designed to suppress the signals of the global satellite navigation GPS system in the range of 1500-1600MHz. The jammer makes it impossible for GPS satellites to monitor the location of cars and all vehicles through GPS, and the GPS jammer device will not interfere with mobile phones and other devices. GPS jammer can range from 5 to 15 meters, which is sufficient for cars and trucks and buses, because the tracker is usually installed in the cab inside the car. After starting the connection through the car cigarette lighter, the device immediately starts to work and generates radio noise (interference) in the range of 1500-1600 MHz (L1/L2) within a 15-meter radius.

cell gsm 3g 4g blocker

GPS jammers have that type

1. GPS positioning and navigation system, only need gps jammer.

2. Dual-mode navigation: network positioning (mobile phone signal positioning) navigation + GPS navigation. For this kind of navigation, you need a GSM GPS jammer.

3. Network positioning (mobile phone signal positioning) navigation. For this, you need a gsm jammer.

4. COMPASS system, GLONASS system and Galileo system.

234 These three systems are hardly used for civilian purposes.

car GPS jammer

GPS equipment will need a phone card. The current location information calculated by the GPS module is uploaded from the communication base station to the positioning server through this card for users to query, and the jammer uses wireless electromagnetic waves to interfere with the communication between the card and the communication base station to achieve The purpose of GPS location cannot be queried by the user.

the working principle of GPS jammer:

Mainly by releasing radio interference waves, the GPS locator can be invalidated within the designated electromagnetic wave band, forming the same electromagnetic environment as the equipment to achieve the purpose of blocking the signal.

There are two ways to shield GPS signals. First: the direct is to remove the two wires of the GPS host. Second: Go to the electronics market to buy a GPS signal jammer, but you must first distinguish what signal tracking method the GPS on your car uses.

There are only two ways of signal tracking: (1) Cell phone signal. (2) Direct satellite tracking signal.

Generally, most GPS tracking signals use mobile phone signals. GPS jammers have the same interference effect on car navigation. GPS used for car navigation is the same as mobile phone signals. It is easily interfered by electronic devices. The signals are shielded, so that all communication devices in the range lose their signals. However, such equipment also has disadvantages for the users. The signal jammer can only be turned on temporarily, and it is impossible to open it forever. As long as he turns off the jammer, the GPS will have the signal again.

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