Category: Tag Frequency

With the rapid development of technology, various signals have become more destructive, and the use category has also increased. The scope of application has been extended to many industries, including airports, hospitals, libraries, university examination rooms, etc. If a discreet person uses a signal jammer device, important files can be protected from theft. The WiFi network has become a must for work, but even if we set a password for the WiFi router, someone can easily crack it, and then access your network and use it. In this case, some hackers can steal your data without your knowledge. Therefore, more and more people pay more attention to network security, and some fields have gradually used frequency band jammers that can interfere with various bands.

GPS jammers are becoming more and more popular

As GPS systems become more and more popular, GPS signal jammers have become necessary for us. You may want to know what GPS jammers are and what potential applications they have. In order to explain the GPS jammer, we first need to know how the GPS system works. Global Positioning System—GPS for short, is a system used by many people, companies and military for navigation purposes. The GPS system uses a series of satellites that emit radio signals. Such signals reach the electronic GPS receiver to determine the position by triangulating the shape. GPS can be used for personal portable electronic devices, vehicle navigation and positioning systems, and can also be used for small GPS tracking devices. The position of a person can be found by triangulation, which is a method of measuring three separate points to calculate the position. In the GPS system of the vehicle, the position of the car is measured by three satellites orbiting the earth. GPS can accurately transmit location information to the receiver through triangulation.

gps wifi cell phone jammers

Let us now look at GPS signals, which are radio signals occupying specific frequencies. GPS actually has two main frequencies, one is for public and non-military use, and the other is only for the US military. Since GPS is nothing more than weak radio waves, although technical equipment and expertise are required for this purpose, GPS jammers can be used to block or distort these waves.

GPS jammers were originally created by the government for military organizations and spy agencies. Some themes can be combined with cell phone jammers (also called cell phone jammers and wifi jammers). Uses include messing up the enemy at exact locations, or making enemy GPS guided missiles or bombs fall in these places.

Recently, civilians have sought these devices to ensure their privacy in a world increasingly tracked by GPS. However, most civilians do not have the technical ability to create their own devices because it is much more complicated than blocking radio signals through basic radio interference.

Overflying drones brings security risks anti-drone systems become the main force

The development of unmanned aerial vehicle technology has threatened the safety of many fields, especially some indiscriminate flying drones, which has brought security risks to important places such as airports. In order to be able to effectively prevent the occurrence of dangers and to effectively solve the interference of drones, Beijing Shenzhou Mingda Company has made great efforts to develop anti-UAV defense systems to protect safety and privacy in various fields. As an expert in anti-UAV systems, Beijing Shenzhou Mingda has developed various types of anti-UAV products, which are applied in various fields and scopes, and become the main force in combating unmanned aerial vehicles.

handheld drone jammer light

It is understood that the Greatjammer drone jammer mainly uses signal infection technology. Through advanced interference technology, the signal between the drone and the operator is blocked, and the data transmission is cut off to ensure that information is not leaked. Not only that, the Beijing Shenzhou Mingda counter-UAV system can also detect commercial small UAVs, and use signal interference technology to locate the invading UAV in mid-air, and at the same time, change the UAV’s route and target. Drive them out of defensive airspace, or prevent other UAVs from entering the airspace over areas that are prevented and controlled by counter UAV systems. The most important thing is that Beijing Shenzhou Mingda has continuously upgraded its drone technology during its development process. No matter what kind of drone it is, it will be detected by the Beijing Shenzhou Mingda UAV countermeasure system and be effective. Interference, there will never be any slipping fish. As the industry’s leading manufacturer of UAV countermeasures, Beijing Shenzhou Mingda has leading anti-UAV technology, guaranteed product quality and good interference countermeasures. It is a wise choice for all walks of life to counter UAVs.

How to choose a high-performance test signal jammer?

How to choose a high-performance test signal jammer device? As we all know, a good test signal jammer needs to be involved in many aspects. Not only does the product have higher performance and better quality assurance, but it also needs to have an affordable price. After all, there are many choices of jammers on the market today, but Customers often want to choose the most satisfactory one from them. This is also for the purpose of achieving the most cost-effective consideration. So is there a manufacturer that can do this?

portable mobile phone radio jammer

For many schools, as the day of the college entrance examination is approaching, they are now preparing equipment and materials for the examination room everywhere. Among them, the test signal jammer is undoubtedly a very important one, because it is an effective way to prevent the examination room There are high-tech equipment for cheating. Therefore, schools are very cautious about the choice of cheating devices for exam signals. They must have professional strength and happy equipment. Among them, Beijing Shenzhou Mingda Company is a company that can provide customers with High-performance jammers, as a professional manufacturer, has brought more professional technical support to many customers over the years, made targeted research on customer needs, and finally gave customers products that can be implemented. Program. Friends who have doubts about purchasing are welcome to contact Beijing Shenzhou Mingda to consult the price of test signal jammers. Here are the best quality equipment and the most complete services. All products have undergone strict quality inspections, and each production process is treated almost harshly. Strive to bring customers the most outstanding products. After years of development, we have reached several cooperations with many customers and have been highly praised. It is a more wise choice. Welcome customers to come and buy.

Mobile signal jammers do not apply to prisons in Punjab

Sources told HT that put aside jammers that can’t control the newer and faster 4G networks, but many jammers aren’t even equipped to interfere with 3G.

When it comes to blocking signals of illegal cell phone use by prisoners, Punjab’s prisons are still blocked in the era of 2G reception. So far this year, inmates in state prisons have seized 600 cell phones, but gangs in particular continue to update their Facebook pages in their cells, except for activities aimed at profiting. the security of their operations.

The source told HT that put aside jammers that can’t control the latest and fastest 4G networks, but many jammers aren’t even equipped to interfere with 3G. Only Kapurthala Prison and Nabha High Security Prison have 3G jammers.

Senior Mobile Network Engineer Sandeep Law explained his technicality: “A wifi jammer with a capacity of up to 900 megahertz (MHz) can only control 2G networks. However, the 2100 MHz frequency used in 3G and 4G technologies is more powerful. Make these jammers obsolete. Upgrading is expensive. ”

Power GSM 3G 4G 5G Jammer

Police sources said that after Nabha escaped prison in November last year, a group of gangs released their five spouses and a terrorist from the Khalistan Liberation Front (KLF), but did not intensified the disruptors. It was discovered during the investigation that the gang that attacked the prison kept in touch with their accomplices in the prison by internet phone.

“In the absence of these jammers, criminals can freely use all mobile and internal means of appeal, many of which can even freely manipulate gangs and other activities from inside the prison.” With the rapid expansion of mobile networks, the market is very easy. 4G SIM card, “the head of the prison department declined to be named.

It should be noted that prison officials have repeatedly admitted that it is “almost impossible” to control the use of cell phones in prisons as inmates manage to transport them to prison through various illegal means (including bribery). guardians).

While acknowledging this problem, IPS Sahota police, the director general of the prison said: “We have submitted a proposal of Rs 8 crore to the Interior Ministry to upgrade the phone jammer to the 4G network of the Nabha central prison, Patiala. , Bathinda and Amritsar. We hope to be sanctioned soon. “

What jamming device can stop a truck’s GPS monitor?

Hi guys! The company I work for has installed a GPS monitor in my van. Please tell me which jamming device should be obtained to ensure that the signal is blocked.

I’m using a Wi-Fi connection, but I’m not sure how easy it is to hack. We use Bluetooth and have never heard of Bluesnarfing (Bluetooth hacking technology). And of course, we know how to use GPS to get to where we are and where we need it, but have you ever heard that you can track your GPS navigator?

Every day, more and more people are worried about protecting their privacy. Everyone knows that many of these newly introduced wireless gadgets can steal our personal information, and we don’t know that either.

4g cell phone jammers for sale

To achieve your legitimate goal, you need to block the signal of this tracker installed in your van. Therefore, you should use a van GPS jammer to prevent this GPS tracker from sending data about your location to a base station somewhere in your company. This GPS jammer helps maintain the right of an individual to freedom of movement.

As you can see, you always have the ability to influence the situation, even though the company is trying to control you and monitor every move.

The future market trend of the shielding device

The State Security Bureau, in cooperation with the Radio Management Committee of the Ministry of Information Industry, Northern Jiaotong University and other institutions, formulated the first industry standard, “Technical Requirements and Test Methods for Mobile Communication Jammers for Security Conferences”. With the guidelines relaxed, experts said the market potential of shielding devices is huge and the industry’s scope for development is extremely wide. At present, the global cell phone ownership has reached 2 billion. It is estimated that the demand for shielding devices is 1% of the total number of cell phones. That is, for every 100 mobile phone users, there is one shielding device user. This user can be It is a safe place, a secret place, a quiet place or a public place or a person.

The shielding system is not only used in high-level places such as arsenals, political parties, governments and military, public safety, finance and trade secrets, but it can also be used in places closely related to people’s lives. Experts believe that based on the latest usage analysis, the cell phone signal jammer market size could reach tens of billions of yuan.

8 Antennas High Power blocker

The rapid development of modern communication technologies requires that companies of technological security keep pace with the times and continuously develop and strengthen their own strengths in order to meet the diverse challenges. The widespread popularity of cellular phones not only brings convenience to people, but also poses new problems for the security and confidentiality of communication. Eavesdropping, leaks, exam room fraud, medical accidents and gas station explosions occur endlessly and accelerate the shielding of cell phone signals. Promotion and use. It is mainly used in exam rooms, prisons, gas stations, cell phone bombing prevention, oil depots, liquefied gas stations, detention centers, interrogation rooms, courts, labor reform teams, conference rooms, theaters, churches, libraries, school dormitories, etc. for security and confidential occasions ( confidential offices, negotiation rooms, mobile vehicles, mobile politicians and dignitaries of companies) etc. as well as cell phone signal jammers are becoming increasingly important in social life.

Depending on the location, Jammer shop has designed and manufactured different kinds of jammers, designed and shielded different places, fully exploited the product performance, and greatly improved the effect of the jammer. It beats the crowd with its excellent performance. And received unanimous praise from the industry!

Within 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. The jammer scans from the lower frequency of the forward channel to the upper end at a certain speed during operation. This scanning speed can lead to garbled interference with the message signal received by the mobile phone. The mobile phone cannot recognize the normal data sent from the base station, so the mobile phone cannot connect with the base station and achieve the purpose of shielding the mobile phone signal. The mobile phone seems to be searching the network, no signal, no service system, etc.

Do I have the right to ban the use of mobile phones during working hours?

Employers may limit employee rights and personal freedoms. However, that does not mean that it is possible to completely ban the use of mobile phones during working hours.

No, it is very dangerous to generally and absolutely ban the use of personal telephones.

Limitations must be justified by the nature of the task being performed and proportional to the purpose pursued (Labor Law, Art L.1121-1).

The rules of procedure cannot be justified by the nature of the task to be performed and cannot include restrictions proportional to the purpose pursued (Labor Law, Article L.1321-3).

However, for safety reasons, you may prohibit the use of the telephone while driving the device, handling dangerous products, or when there is a risk of interference with electronic devices. However, employees working alone in the office are prohibited from using their mobile phones. The phone doesn’t seem to be justified.

3G Mobile Phone Jammer

Using cell phone signal jammer can be annoying to other employees. Therefore, it should be used with caution. For example, you can set usage rules such as asking an employee to put the phone in vibrator mode or making a call outside the office.

Commission Nationale Informatiqueet Libertés (CNIL) authorizes use for personal purposes within the company, provided that the telephone and the Internet are of reasonable use.

Remember that employees fulfill their employment contracts in good faith. There needs to be a reason to use the phone. Don’t sacrifice work performance. In case of abuse, employees can be punished. You need to be able to prove abuse of your personal phone during working hours …

To accurately determine the scope of your rights in disciplinary matters, Tissot Editions advises the document “Tissot Social Enterprises” whose complete file is dedicated to “Disciplinary and Disciplinary Procedures”.

Mobile phone shielding device selection guide for examination rooms

By the annual exam season, all parties have begun to prepare for the exam, and the invigilator has various tricks to prevent high-tech fraud. Among them, the shielding device used in the examination room is still an anti-fraud shielding device. However, Chengdu Saiyue Communication reminds that there are many types of shielding devices, and users should clarify their needs before purchasing them to avoid test room accidents due to poor shielding effects, and pay attention to the correctness of the method of use.

First of all, I want to clarify the place of use. Most schools use test room-type mobile phone shields that are suitable for long-term work and are durable. The second is how big are we in the shielded area? For example, if it is a room of 100 square meters or a venue of thousands of square meters, if the area is large, the power must be larger, and if the area is small, the shielding power must be considered small. Then there is which frequency bands need to be shielded. Are all China Mobile, China Unicom, Telecom and CDMA shielded? Still only need to shield part of the frequency band.

Phone Wifi signal jammer

At this time, we remind everyone that if you want to buy a suitable shielding device to achieve the effect, it depends on the method used. The main points are as follows:

1. It is recommended that the indoor shielding device be placed at a height of about 180cm-220cm above the ground, with a forward angle.

2. Whether there are obstructions (such as walls, metal products, etc.) between the wireless jammer and wireless communication equipment (mobile phones, etc.). The interference signal emitted by the jammer will be attenuated to different degrees after passing through the obstruction, please try to avoid it.

3. The weaker the wireless communication signal strength in the use environment, the stronger the theoretical shielding effect of the shielding device.

4. The farther the jammer application environment is from the signal tower, the stronger the theoretical shielding effect of the jammer.

Many authoritative units began to use mobile phone signal jammers

 

When the mobile phone works, 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 view of this communication principle, the cell 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. 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 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.

desktop signal blocker

Common mobile phone signal jammers on the market have operating frequencies: 869~894MHz; 825~960MHz; 1805~1880MHz and 1900~1990MHz, etc. The operating frequency bands are CDMA800, GSM900, DCS1800, and PCS1900. It can control the range of about 40 meters in diameter, using DC-DC converter input voltage and 5V output voltage.

The emergence of mobile phone signal jammers has played a certain role in suppressing the increasingly serious “mobile phone noise pollution”. But as a mobile communication interference device, will the electromagnetic radiation generated by the A topic of concern. At the same time, during the installation and use of mobile phone shielding equipment, due to the greater autonomy and randomness in terms of the number of installed units, transmission power, coverage, and radiation control, some places require effective interference and The shielding effect is maximized, even blindly introducing high-power mobile phones to interfere with the installation and use of shielding equipment. The impact and damage to the human body cannot but be worrying.

As another product of human beings, the “mobile phone signal jammer”, while shielding mobile phone signals and ensuring information security, it will definitely bring a certain negative impact. However, when we look at the problem, we should see the main contradiction. Just as we did not stop using a kitchen knife because it cuts vegetables, we will not reject a “mobile phone signal jammer” because it may cause harmful radiation to the human body. After all, the “mobile phone jammer” guarantees information security and contributes to social stability is its main contribution. The most important thing is that it brings security to places with high safety factors such as prisons, detention centers, and major conferences.

As far as the quality of the mobile phone signal shielding system is concerned, judging by the current level of scientific understanding, there is no security problem. The reason for this is mainly based on the following two reasons:

First, from a technical point of view, although the mobile phone signal shielding system is a new technology product, it should be said that it has been developed more mature in technology, so it has high security. According to the test report of the authoritative testing organization, the qualified mobile phone signal shielding system has low radiation, and because it is usually installed in high places, it has no adverse effects on human health.

Second, from a practical level, many authoritative units in China have begun to use mobile phone signal shielding systems. For example, in 2004, in order to maintain the solemn atmosphere of the memorial hall and meet its special confidentiality requirements, the Chairman Mao Memorial Hall Administration installed a mobile phone signal shielding system produced by Shanghai Jike Electronics Co., Ltd. in the memorial hall. After actual use and testing , The Memorial Hall Administration believes that the products produced by Jike Company meet its requirements in all aspects including safety and aesthetics. I think this should be a very convincing case. In addition, according to the information collected by the author, as a leader in the mobile phone signal shielding system industry, the products produced by Shanghai Jike Electronics Co., Ltd. are used in the prisons of the judicial departments and the detention centers of the public security departments. All of them are used, and the feedback after use is believed to be a proof of immortality.

Principle of signal isolator

In the industrial production process, a variety of instruments and meters are used in the monitoring and control of the generation process, which will generate a variety of signals: both faint small signals of millivolt level and tens of volts Large signals, even strong signals up to thousands of volts and hundreds of amperes; there are DC low-frequency signals, high-frequency or pulse spike signals; and these signals have to go through the process of mutual transmission and transmission, so how to ensure these signals In particular, the non-distortion of analog signals during transmission will become a problem that must be solved in system debugging.

Specifically, only when the analog signal transmission between the control device and the sensors and actuators distributed in the field is fault-free and undistorted, can the process control be safe and reliable. Especially low-power analog signals are affected by various external interference signals when they are transmitted in an industrial environment with high interference, and they need a reliable transmission channel. Daily work experience shows that due to equipment requirements, analog signals must be handled and transmitted carefully. However, the measurement and control parameters transmitted in the form of analog signals between the field and the control layer are often in a harsh industrial environment in the transmission project, which is likely to cause distortion of these signals.

smartphone signal blocker

Second, the principle of signal jammer

At present, the signal isolator (converter) is mainly divided into several kinds of isolation methods: transformer isolation method, photoelectric isolation method and transformer and photoelectric joint isolation method.

Signal isolators have a history of more than 40 years. Early signal isolators used transformer isolation. Its characteristics are: stable performance, long life, strong load capacity, high isolation strength, but the circuit is complex, and the manufacturing process requires higher.

With the development of electronic technology, in recent years, optoelectronic isolators produced by optical couplers have gradually appeared. Its characteristics are: stable performance, strong anti-interference ability, simple wiring and low cost, but compared to The transformer isolation method has a slightly shorter life.

In some occasions where the interference is large and the process requirements are high, the signal isolator of the combination of transformer and photoelectricity appears, and its isolation ability, resistance to unlimited radio frequency and electromagnetic interference is stronger.