dojammer's blog

Nowadays, there are more and more criminal activities at home and abroad, especially telecom fraud is getting more and more serious. Do you remember the fraud video of a certain country last year? Let the Chinese people clearly realize the harm of fraud, but do you know what technology these telecom frauds use to locate your location? How to solve the problem of fraud phone not locating your location?

In recent years, fraud criminals have become more and more rampant, and many criminals use GPS to carry out fraud activities more frequently. The actual frequency of cellular calls can cause intruders to track, and intruders try to determine the actual location of everyone or other groups. In order to deal with the use of communication equipment, mobile phone jammers for vehicles are designed.

There are many jammers on mobile phones that are suitable for monitoring or preventing common faults. Therefore, all your personal behaviors will be monitored by others. At all times, you need to be very careful to prevent being tracked by agents. Using GPS blockers can easily prevent intelligence activities. You must install a gps mobile phone jammer in your car, and your location will be kept secret.

If you suspect someone is using GPS to track your location, protect yourself as soon as possible. Imagine that with the help of a GPS spy device, someone can listen to every word of your conversation and use it against you. Besides, the surveillance system is so small that it is almost impossible to find its location. However, when installing a GPS signal jammer in a vehicle or somewhere else, it can not only save time but also ensure safety. It is important to note that if you use mini jammers to protect personal safety and privacy, it is legal to use them.

Cracking method 1: Enter the cell phone settings, click "Network Settings", change the network mode to "Manual Model" and then enter "Online Search".

Principle: The work of the cell phone starts within a certain frequency range. The cell phone signal blocker can only block the phone signal without affecting other nearby electronic devices; save power, the power is 12W-480W.

It is also called cell phone signal blocker, cell phone signal blocker, phone jammer, signal jammer, cell phone blocker, signal obstruction device, cell phone signal isolator, signal isolator, cell phone signal interceptor, radio signal blocker, etc. according to its function.

In order to solve the information security problem during the examination process, many examination halls usually use cell phone signal blockers and conduct external signal interference within a certain range in some ordinary high schools.

How does the blocker interfere with mobile phone signals?

Simply put, the cell phone signal blocker is to block the phone and base station through radio waves within a certain frequency range, and complete the data and sound transmission with a certain baud rate and modulation method to interfere. In fact, during the work process, the mobile phone contacts the base station through the uplink frequency, and then transfers the signal to the MSC mobile service switching center to realize the call.

Cracking method 2

1. Use Bluetooth: upload the answer to the file with the mobile phone.

The cell phone signal jammer uses microwave radiation interference technology to emit tangible electromagnetic signals within a certain distance range.

2. Method of cell phone signal jammer.

It uses frequency multiplication, frequency division, frequency hopping filtering and other technologies for the uplink and downlink channels of the mobile system to analyze the required screen magnetic field; customize the spherical shielding space according to the power size of the jammer, and automatically form a shielding magnetic field within the specified range, so that the phone in the space loses the mobile phone.

The cell 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 form a chaotic code interference in the phone in the received message signal. The mobile phone cannot detect the normal data sent by the base station, so that the cell phone cannot establish a connection with the base station. In order to cope with the continuous development of the communication system, the third-generation cell phone signal jammer has been carefully developed according to the actual situation of foreign mobile communications.

The examination room must strengthen discipline and specialize in the main examination and monitoring of the test process, prohibiting any cheating. In addition, the cell phone signal jammer is also suitable for all prohibited places such as military, government agencies, prisons and gas stations.

When the cell phone signal jammer is in working state, it can make the mobile sending and receiving signal function in the specified range invalid and unable to dial out and dial in, thus achieving the purpose of mandatory disabling.

In many complex environments, the situation on the scene is unclear. In order to make the cell phone signal jammer play a very good effect and prevent accidents in special occasions. For the situation of the power supply system of the equipment going out to perform tasks, the cell phone signal jammer is usually equipped with a built-in battery or an external battery box. Increase the use time of the impact instrument and protect the combat personnel from the harm of the remote control time bomb. Whether the cell phone signal jammer uses a built-in battery or an external battery box, there is still a lot of knowledge in daily maintenance of the internal structure battery when it is idle. Let's discuss how to maintain the built-in battery or external battery box of the cell phone signal jammer.

Regardless of whether the cell phone signal jammer uses a built-in battery or an external battery box, the current mainstream batteries and battery boxes all choose 18650 lithium batteries as the most basic lithium battery core of the battery. The 18650 lithium battery core has the advantages of easy to carry, sufficient power, and long service life. Only by properly maintaining the battery on a daily basis can the built-in battery of the mobile phone signal jammer be fully utilized and the battery life be increased.

Use the cell phone signal jammer to charge with the correct charger. The batteries used in cell phone signal jammers are basically customized batteries, so the battery charger is equipped independently according to the customized batteries. Therefore, the charging of the built-in battery of the jammer also needs to be equipped with a special charger.

If the cell phone signal jammer is not used for a long time, it is necessary to charge and discharge the built-in battery of the jammer once in a while. If the built-in battery of the cell phone signal jammer is not charged in time, the internal 18650 lithium battery cell may be damaged. If it happens, after the battery is fully charged, the cell phone signal jammer will find that the time used is much shorter than the normal time before. After waiting for a while after standby, it will be restarted. The cell phone signal jammer can continue to operate for a period of time. At this time, it can be basically judged that the 18650 lithium battery cell of the cell phone signal jammer has a common fault and needs to be returned to the factory for repair.

In general, after using the cell phone signal jammer, it must be charged in time to ensure that the battery has sufficient power. In the case of long-term non-use, it is also necessary to charge and discharge frequently to increase the battery life

The application of full-screen segment cell phone signal blockers cannot give up the cost of modern communication technology for the people.

Among the people who use full-screen segment cell phone signal blockers, some are to prevent cheating in exams, and some are to keep the venue quiet or exchange privacy protection, which are all derived from the desire and purpose of excellence. However, there are still their own interests. For example, the owner of a telephone booth is likely to use a full-screen segment cell phone signal blocker to affect the mobile communication base station around the business location, making it difficult for people working near the telephone booth to use their mobile phones, but to change to voice chat in the telephone booth to improve their source of life. In addition, mobile communication operators may also use full-screen segment mobile phone signal blockers to harm the interests of the other party, allowing you to gain an advantage in some of the same industry competition.

The above is a lot of people use full-screen segment cell phone signal blockers to say, but no matter what the purpose is, do not give up the cost of modern communication technology for the people. In fact, according to scientific research, it is possible to assemble a full-screen segment cell phone signal blocker without affecting the start of modern communication technology for the people. There are three reasons why the full-screen segment cell phone signal blocker disrupts the mobile communication base station signal:.

First, the user of the full-screen segment cell phone signal blocker did not consider the communication fraud of the smiling face, and the target of action was wrong. It should have restricted the mobile phone communication of a small number of people (such as students), but expanded the overall goal to other general people around.

Second, the operation steps are unscientific. Because the installation method of the full-screen segment cell phone signal blocker is unscientific or its signal strength is set too high, it should be controlled within a reversible range but it is not well controlled.

Third, the purchased full-screen segment cell phone signal blocker does not meet the radio equipment approval standards, the power exceeds the standard, or it is a counterfeit and substandard product. Finding the cause, in order to solve the impact on the mobile subway signal, it is actually very simple: first use reliable manufacturers to meet the standards, secondly select the assembly position and direction of action, and thirdly set the appropriate signal strength to limit the transmission signal to a closed reversible range. If the above three points can be achieved, the impact on nearby mobile communication base stations can be minimized.

2. The unscientific application of full-band cell phone signal blockers in schools may cause unnecessary harm to the human body.

Basic knowledge analysis shows that when the full-band cell phone signal blocker is working, if the setting is not standardized and the signal strength is too high, in a reversible large conference room, classroom and other enclosed spaces, electromagnetic waves accumulate in a small space, and according to the original external distance wall, ceiling, and ground multiple reflections, the staff in the room will be in a relatively serious electromagnetic wave radiation. According to the survey, the college entrance examination and the high school entrance examination are the venues where the full-band cell phone signal blocker is used the most. Therefore, some test sites using the full-band signal blocker have caused some victims (college entrance examination inspectors, teachers and students) to become restless, unable to concentrate time and energy, and some students even have headaches. All signs indicate that if the signal strength of the full-bandcell phone signal blocker is too high, it will affect the normal thinking of the candidates who register in the examination room.

As we all know, radio waves are easily transmitted in the air. While the full-screen segment signal blocker is used to isolate the base station signal in a certain area and achieve its limited purpose, it also affects health to varying degrees. Therefore, the full-screen segment signal blocker must be used with caution.

Nowadays, there are many areas around us that are strictly prohibiting the use of mobile phones, especially those places with information security requirements such as examination sites, corporate offices, classrooms, factories, companies, etc. In the past, in addition to putting mobile phones in the signal shielding cabinets of the security department in advance, these areas can also install mobile phone signal blockers. Cell phone signals can appear in different places, everywhere, such as Wi-Fi signals and other signals exist everywhere, so installing a cell phone signal blocker can effectively block them. Without a mobile base station, the mobile phone will not be able to receive information. At this time, you are less likely to have the mentality of playing with your mobile phone, and you can quickly improve your personal skills and achieve your desired goals. The emergence of mobile phones has provided a very good communication tool for the general public, which has brought the distance between us closer and added great convenience to our daily lives. However, with the increasing popularity of mobile phones, most people have their own mobile phones. Mobile phones have now developed to the level that people do not leave their phones, but this has also added great threats to many special places. Therefore, the market for cell phone signal blockers has also emerged. If you want to choose a good signal shielding device, you need to understand how the device can achieve the best effect in each occasion.

If you want to maximize the actual effect of the cell phone signal jammer and use it in different venues, the operation method is as follows:

1. Use in a fixed area:

(1) Professional technicians use spectrum analyzers to accurately detect the network signal frequency of the control site in advance, and then adjust the output frequency of each frequency band of the mobile phone signal jammer according to the data information, so that the output data signal of each frequency band of the cell phone signal jammer can be more targeted, and the frequency band module can be used at the scene to give full play to the maximum effect.

(2) Place the cell phone signal jammer in a higher position. When the wireless antenna rises slowly, the shielding signal will cover more areas.

2. Mobile site installation:

(1) The output frequency of each module is adjusted. In addition to the self-use frequency to maintain the internal employee communication application, ensure that the output frequency of all modules can be seamlessly connected.

(2) When driving fast, insert the cell phone signal jammer in the middle of the transport team. If there are many cars, it is best to use several cell phone signal jammers in combination.

Communication technology is developing faster and faster, and 5G technology has been basically popularized in recent years, but do you know what is the working principle of wireless wifi signal jammer?

The working principle of mobile communication technology is that within a certain frequency range, the transmitting wireless network equipment and the base station communicate through electromagnetic waves, and transmit data and sound at a certain serial port baud rate and modulation method. The normal operation of the mobile phone is to send the working frequency to the base station, but there is a voice call requirement. First, according to the request report, according to the specific situation of the peripheral channel of the terminal, it is allocated to the mobile phone service channel, so that the mobile phone jumps to the service channel to realize voice calls and transmit data. At the same time, wireless communication must ensure sufficient frequency stability in order to better receive and communicate.

According to the above principle, the several major modules of the wireless wifi signal jammer are composed of switching power supply, scanning control module, segmented RF module, amplifier module, transmitting antenna unit and other parts. After the signal jammer's transmitted scanning signal passes through the inverter, it enters the oscillator and is adjusted to the mobile communication working frequency band, and then amplified by the power amplifier and controlled by the voltage regulator. After amplification, the frequency deviation signal is emitted into the air in the form of electromagnetic waves. Because the frequency deviation signal generates error code interference in the mobile phone's received message signal (increasing the noise signal ratio to the device threshold), the mobile phone cannot receive the normal data transmitted by the base station, so that the mobile phone cannot establish a normal connection with the base station, thereby causing the mobile phone to leave the base station communication network. The mobile phone manifests as the phenomenon of no network signal and no service system, achieving the blocking effect.

The working principle of the wireless wifi signal jammer is to scan the low-frequency working frequency of the channel to the high-frequency scanning at a certain speed during operation. The scanning speed can also generate error code interference in the mobile phone's received message signal, and the mobile phone cannot detect the normal data transmitted from the base station, so that the mobile phone cannot establish a connection with the base station, achieving the effect of shielding the mobile phone signal, and the mobile phone manifests as the phenomenon of network search, no signal, and no service system.

The interference output power of the wireless wifi signal jammer is certain, and the shielding radius of the unobstructed space is determined by the path loss and the receiving base station signal pulse signal. In order to achieve the interference of the mobile phone signal jammer on the mobile network, it is necessary to ensure that the signal field strength emitted by the jammer exceeds the field strength of the mobile signal in the interference area. The closer the interference address is to the base station, the higher the field strength and the lower the effective interference area. On the contrary, the farther the interference address is from the base station, the weaker the field strength and the more effective interference areas.

It is not difficult to see that within a certain signal strength, the interference range depends on the field strength in the interference area. No matter how powerful the wireless wifi signal jammer is, as long as the signal strength is constant, as the distance increases, the interference signal strength will gradually decrease, thereby losing the interference level. The following is a comparison table of distance and path loss. Then the wireless wifi signal jammer derives the channel output power, base station signal pulse signal, and coverage line gain value to determine the theoretical coverage radius with practical value.

In today's daily life, various types of cell phone signal blockers continue to emerge, and we don't know how to choose, such as the examination venues of this year's college entrance examination, the camps of new project development, etc. But in fact, not all new products are suitable for us to use in the venues we want. Some new products are private, so they are not suitable for us to use in other fields. There is a very special wireless wifi signal blocker, which also appears in front of us. Its name is wireless wifi signal blocker. What are its advantages?

Wireless signal blocker

Whenever we use a wireless signal blocker, you will see that no matter where we are in a fixed space, as long as the switch of the signal blocker is turned on, no one can find your wireless signal. In other words, you can't use your mobile phone when using wireless signals.

What are the advantages of wireless signal jammers? The following is an explanation of the advantages of wireless signal jammers by Shiji Tiancheng editor:

1: Wide range of use

Wireless signal jammers are mainly used in examination venues, and can also be used in prisons, gas stations, military, petrochemical plants, detention centers, courts, cathedrals, public libraries, student dormitories, special and confidential meeting rooms, etc.

2: Strong targeting

Wireless signal jammers are mainly used in this year's college entrance examination, postgraduate examinations, self-study examination venues, and various major college examinations and various junior high school examinations. Schools, technical secondary schools, vocational high schools, prisons, detention centers, conference rooms, etc. use mobile phone communications, text messages and collusion

Three: Diversification of shielding signals

Effective shielding: CDMA/GSM/DCS/PHS/TD-SCDMA/WCDMA/WIFI/TD-LTE/FDDD-LTE/5.8G

Four: Model advantages

1. Use high-dispersion aluminum alloy profile shell, low operating temperature, stable shielding effect

2. Built-in silent turbo fan, low working noise.

3. Separate power adapter, 12V/24V DC power supply, convenient for vehicle-mounted mobile work.

4. The wifi antenna is externally set, the appearance of the unified port is more beautiful and decent, and it has an anti-loosening design. The wifi antenna and the host have marked working frequency bands for easy one-to-one correspondence.

Cell phone signal blockers can interfere with and block major mobile phone signals in China, such as: 2G, 3G, 4G, 5G, GPS, WIFI, 2.5G. Now the widely used 5G signal can also be blocked normally. It can be used in many institutions such as: school examination rooms, prisons, guards, banks, conference rooms, military and other places. In order to ensure the fairness of the examination, many examination rooms have also installed such equipment, and some simulation examination rooms have also purchased this equipment as a necessary equipment sequence. So the question is, there are still many people who don’t know how to choose the right cell phone signal blocker for themselves.

1. Choose a cell phone signal blocker manufacturer and get first-hand sources

① Compare prices and choose a few reliable manufacturers to investigate the quality, technical means and brand of the products;

② Check the manufacturer’s technical personnel and technical use plans on the Internet to get a preliminary understanding and communicate, and listen to technical explanations;

2. On-site test of actual effects

Choose the best products from these three companies to enter the on-site car market, and then compare the test results to select the best equipment;

3. Investigate the actual product case effects

① After testing the product, you can go to several companies that are using this product for inspection;

② During the inspection, it is best to bring the mobile phone into the shielding area after approval to verify the shielding effect.

Today's society is the era of the Internet. Mobile surfing and playing games have become the norm. Sometimes, there have been cases where high-tech communication equipment has been used to eavesdrop on the meeting. In some particularly important venues, especially when the company needs to communicate with the other party during meetings and cooperation, it is very worried that someone will use a mobile phone or other high-tech equipment to eavesdrop and record, causing information security leaks. In today's developed life, people often think that we all think that discussing something important with others, but we are worried about the other party's recording, and the other party is also worried about my recording, which is harmful to us. How can we avoid these meaningful conversation information from being stolen by others?

Everyone treats each other sincerely, and there is also a very old way, that is, the two sides talk in the bathroom, so that both sides chat while taking a bath. Both sides take off only a short shorts. In addition, the short shorts are also soaked in water. It is almost impossible to carry a wiretap and other equipment. You can talk about things confidently. According to the current recording technology strength, recorders and equipment may avoid water, and under the control of the water environment, there is generally no recording effect.

Communication technology has been very developed. All conversations between people may be recorded. When both parties discuss very important confidential matters, they are somewhat worried about being recorded by the other party. Choosing a bathroom as the negotiation location is a good preventive measure. Men and men are suitable for negotiations in bathrooms; women and women are also suitable for negotiations in bathrooms; men and women are also suitable for negotiations in bathrooms. It's just that there are no bathrooms in many places, but there are generally bathing places. Talking about important things in the bathroom can also be used as a place to avoid being recorded by the other party.

In addition to these folk remedies, you can also use anti-eavesdropping software-signal jammers. By transmitting ultrasound waves containing random noise that cannot be perceived by the human ear, when using electronic digital products, this noise and the sound of ordinary conversations are captured in the digital product together, making the recorded audio invalid, and the audio information in the video has the same interference effect. And because the noise with ultrasonic noise is random and cannot be restored. Therefore, the audio after interference cannot be restored, which fully ensures that the original information will not be exposed and spread.

The cell phone signal jammer has high interference intensity: the ultrasonic noise optimization algorithm developed by us based on FPGA can effectively interfere with mobile phones, voice recorders and other digital products, can capture the noise, and completely avoid the harsh sound that only a few people can hear. The interference distance is far: the anti-recorder has an interference distance of more than 2 meters for 95% of mobile phones, more than 5 meters for 60% of mobile phones, and 10 meters for notebooks such as iPhoneX and iPhone8, which can effectively protect the content of conversations.

Contraband cell phones are a real problem. They allow inmates to secretly process meth, run illegal businesses and even organize murders, right under the radar of guards and prison wardens. One prison in South Carolina recently detected 35,000 cell phone calls and text messages in a 23-day period. This is a very significant problem for prisons.

A further problem is the ability of inmates to communicate with witnesses before an upcoming hearing, trial or indictment. By matching alibis or correcting inconsistencies in testimony, defendants can get charges waived or dismissed entirely. The concern that prisons feel is that the use of cell phones by inmates is not detected, so that inmates can be caught before a surprise search that could confiscate cell phones, knives, meth, needles and other contraband. This contraband could be life-threatening to prison officers and medical staff.

A cell phone in the possession of a flash inmate allows him to communicate with outside partners in crime to coordinate escape plans, thus creating a life-threatening situation for the prison's guards and the public, More commonly, reports from correctional facilities overwhelmingly indicate that hidden cell phones are used to harass victims of their crimes, or an inmate repeatedly threatens his victims to persuade them to drop charges or change a person's story to convey discredited testimony. Many inmates continue to run illegal drug operations from behind prison walls. Cell phones are a primary way for inmates to keep drug operations running and under tight control. By contacting them before visitors arrive, inmates can arrange to move methamphetamine and drug paraphernalia, allowing them to continue their illegal habits of being incarcerated. This family is often harassed by the inmate's family members, who demand parole when they learn that the family members are getting faster service while in custody.

Prisons have tried and failed to prevent cell phones from entering prisons. If there is no way to prevent cell phones from entering prisons, regular cell phone use by inmates must also be prevented within prison structures. Prison signal jammers have become an essential supplement to the prisoner protection system. Cell phones are shrinking every day, making it easier for prisoners to smuggle into the facility, which is a more difficult task for correctional officers who have been exempted from heavy responsibilities. However, cell phone jammers are a weapon that restricts prisoners from using cell phones for potentially dangerous activities. Using cell phone jammers can also force prisoners to use phones approved/supervised by the prison.