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Will the shielding effect of the signal shielding device be affected by the wall
Jammer B. | 10.04.2024 
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With the continuous development of wireless communication technology, people's demand for signal shielding technology is also getting higher and higher. As a common device, signal jammers are widely used to shield interference between electronic devices and prevent information leakage. However, some studies in recent years have shown that walls may affect the shielding effect of signal shielding devices. This discovery has attracted widespread attention from experts and researchers.
As technology continues to advance, we use various wireless devices more and more frequently. However, in some specific occasions or environments, we need to use signal blocking devices to shield the spread of wireless signals and prevent information leakage caused by wireless communication equipment. The signal jammer can effectively block wireless signals. However, due to the complex on-site environment during use, it may be necessary to use the signal jammer across a wall. So is it feasible to use the signal jammer across the wall? Will the shielding effect of the signal shielding device be affected by the wall?
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First, we need to understand the principles of signal propagation. The propagation distance of wireless signals is closely related to the influence of frequency and antenna power, antenna direction, and obstacles. Wireless communication equipment generally works in the 700MHz to 5.8GHz frequency band, and the signal penetration capabilities of these frequency bands are weak. The signal jammer also emits signals between this signal frequency band to interfere with wireless communication equipment. So, when the signal shielding device encounters a wall, will it be affected by the wall? The answer is yes. Walls also have an impact on signal penetration. Generally speaking, walls are divided into solid walls and hollow walls. Solid walls have poor signal penetration capabilities, while hollow walls have relatively good signal penetration capabilities.
The wireless signal jammer blocks the signal received by the mobile phone from the base station. It will attenuate when it encounters obstacles such as walls. Walls are made of many materials: reinforced concrete, glass, wooden boards, iron sheets, etc. The composition complexity of the wall has different effects on the signal of the wireless signal jammer. For solid walls made of reinforced concrete, the attenuation after penetration is very large; if it is made of gypsum board, the attenuation is smaller; if it is made of glass or wood, there is basically no big attenuation. Walls made of reinforced concrete are the most difficult to penetrate for shielding, while glass is easier to penetrate for shielding. The thickness of the wall will also have a great impact on the wireless signal shielding device. The thicker the wall, the weaker its penetrability will be. In other words, the thinner the wall, the stronger the penetrability of the wireless signal shielding device.
So is there any way we can solve this problem? In fact, the greater the power of the wireless signal jammer, the stronger the penetration. Therefore, if there is a requirement for wall-penetrating shielding, you can choose a wireless signal jammer with higher power. The greater power can improve the signal jammer's wall-penetrating use effect and meet the requirements for using the jammer through the wall.
In-depth analysis of signal jammer prices: understand the price range of differe
Jammer B. | 11.04.2024 0 0
As a device used to shield or interfere with wireless signals, signal jammers play an important role in various situations, ranging from confidentiality requirements to preventing the abuse of communication equipment. However, different types of signal jammers differ in functionality and performance, so their prices will also vary. This article will take an in-depth look at the different types of signal jammer price ranges to help people better understand the market.
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1. Traditional handheld signal jammer
Traditional handheld signal jammers are usually relatively cheap, generally ranging from tens to hundreds of dollars. This type of signal jammer is usually small in size and simple to operate, and is suitable for personal use or signal shielding needs in small areas. However, because its features and performance are relatively limited, its price is also relatively low.
2. Professional grade signal jammer
Professional-grade signal jammers tend to be more expensive, generally ranging from a few hundred to a few thousand dollars, or more. This type of signal jammer usually has more powerful functions and performance, can cover a wider frequency range, has higher transmit power and more precise interference capabilities. These devices are often used in situations where efficient signal shielding is required, such as government agencies, military bases, security laboratories, etc.
3. Vehicle signal jammer
A vehicle signal jammer is a signal shielding device installed inside a vehicle to block the connection between the wireless communication equipment inside the vehicle and the external network. This type of equipment is usually more expensive, generally ranging from hundreds to thousands of dollars, depending on factors such as the functionality and performance of the equipment. Vehicle-mounted signal jammers have important applications in some specific occasions, such as prison vehicles, police vehicles, etc.
4. Custom signal jammer
Customized signal jammers are usually customized and manufactured by some professional communication equipment manufacturers or service providers according to customer needs. Their prices depend on the customer's specific needs and customization requirements, and may be higher than general standard products. These signal jammers are often more customizable and adaptable to better meet the specific needs of customers.
Different types of signal jammers have large differences in price, which mainly depend on their functions, performance, application scenarios, market competition and other factors. For ordinary consumers, choosing a suitable signal jammer not only needs to consider price factors, but also needs to comprehensively consider the performance and applicable scenarios of the device to ensure that it can meet their own needs.
High-power remote control assembly transformed into jammer
Jammer B. | 13.04.2024 0 0
The cheap jamming device that can disable electronic car keys is actually two high-power remote controls. Li Tianliang, deputy general manager of after-sales service at Beijing Aojia Shimao Automobile Sales and Service Co., Ltd., said that during the factory, sales and after-sales process of cars, car jammers do not exist as independent detection equipment. “The jammer is essentially a radio transmitter. , it’s just that someone assembled it and used it for evil purposes.”
In the radio expert's studio, the working principle of the car jammer is clear at a glance under the measurement of professional radio instruments.
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Turn on the jammer, and the computer screen connected to the broadband receiver will immediately display a symmetrical columnar waterfall chart, shaped like a thick "big tree".
The expert pressed a car key button next to the jammer at the same time, and a "thin tree" immediately appeared on the edge of the "branches" to the right of the "thick tree". The shape of the "thin tree" is the same as that of the "thick tree", except that its "trunk" and "branches" are obviously one size smaller.
Experts explained that the "thick trees" and "thin trees" displayed on the screen are the real-time frequency waterfall charts of the jammer and the car key respectively. It can be judged from the shape and size of the waterfall chart that the frequency intensity of the jammer is significantly higher than that of an ordinary car key.
"It's like someone speaking loudly next to your ear. His voice is louder and other sounds are drowned out."
In response to the situation where the jammer "missed" and some high-end cars were damaged in previous field tests. Experts explain that in a specific frequency band, if the "thick tree" completely covers the "thin tree", it means complete blocking and successful interference; if the "thin tree" happens not to be within the trunk range of the "thick tree", it means If it is not completely blocked, the interference is likely to fail.
Protecting community airspace requires installing anti-drone jamming equipment
Jammer B. | 15.04.2024 0 0
In today's era, with the rapid development of drone technology, drones have been widely used in various fields, bringing great convenience to people's lives. However, the popularization of drone technology has also brought about a series of safety issues, especially in terms of community airspace security. The misuse and illegal flight of drones have posed a serious threat to people's daily lives. Therefore, it is particularly important to protect the safety of community airspace and install anti-drone interference equipment.
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In recent years, the turmoil in the international situation has made the issue of drone safety more prominent. In Russia, Ukraine, the Middle East, Southeast Asia and other places, drones have become an important role in conflicts and disputes. Drone abuse incidents occur frequently in these areas, posing great challenges to local security and stability. Drones may carry weapons for attack, or be used for reconnaissance and intelligence theft, posing a great threat to the safety of the community. Therefore, it is necessary for us to take practical and effective measures to prevent and respond to the misuse of drones.
Anti-drone jamming equipment is an effective technical means that can interfere with and control drones to protect the safety of community airspace. Anti-drone interference equipment emits electromagnetic waves of specific frequencies to interfere with the control system of the drone, causing it to lose control or force it to land. The application of this kind of equipment can effectively prevent the abuse of drones and maintain the safety and stability of the community.
In the research and development of anti-drone jamming equipment, the anti-drone power amplifier module is a crucial part. The power amplifier module is the core component of the device. It is responsible for converting the energy of the power supply into high-frequency electromagnetic wave energy and radiating it out. An excellent anti-UAV power amplifier module needs to have the characteristics of high efficiency, high reliability, and high stability to ensure the stability and reliability of the interference effect. Therefore, choosing a source manufacturer of anti-drone equipment with strong R&D capabilities and production experience is crucial to obtaining high-quality anti-drone jamming equipment.
The application of anti-drone jamming equipment not only has widespread demand domestically, but has also received increasing attention internationally. In the current international situation, countries are strengthening the research, development and application of drone technology, and at the same time they are also facing safety challenges caused by the misuse of drones. Therefore, the promotion and application of anti-drone jamming equipment is of great significance to maintaining the security and stability of the international community.
Why is it controversial to install mobile phone signal jammers in school dormito
Jammer B. | 16.04.2024 0 0
Students believe that freedom of communication is restricted, the school explains in detail four considerations, and dormitories have fixed phones
"The school has installed mobile phone signal jammers on each floor of the dormitory. There is no mobile phone signal in the dormitory, and it is impossible to contact the outside world in time." An anonymous netizen sent the above message to the Zaobao reporter online, complaining about the restrictions of a middle school in Jinjiang They have freedom of communication and mobile phones have become a decoration. The reporter went to verify the report yesterday.
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It is very inconvenient to not be able to use mobile phones in the student dormitory
At around 11 o'clock yesterday morning, reporters came to the entrance of the middle school for interviews. A senior high school girl confirmed the netizen’s complaint. She said: "The dormitory building has been equipped with jammers. As soon as I return to the dormitory after class, there is no signal on the mobile phone." The cousin who came to pick her up said: "Her mobile phone often has no signal and she cannot contact anyone in time. If it’s really urgent, you have to tell the security guard and then communicate it through the security guard.”
Xiao Su, a second-year junior high school student, also said that the high school dormitory building is indeed equipped with jammers, but the junior high school has not. However, she heard that the junior high school will also install jammers next.
Several first-year high school boys further revealed that the school installed mobile phone signal jammers in the second semester of last year, and the jammers were installed in their dormitories. “When I have dinner at noon or return to the dormitory after class in the afternoon, there is basically no signal. You have to use the dormitory phone for phone calls." When the reporter asked them if they had mobile phones, a boy shouted: "If there is no signal, it is useless to have a mobile phone!"
The reporter followed several boys to the high school boys' dormitory. In the dormitory on the second floor, a boy led the reporter to find the jammer in the corridor. The reporter then tried dialing a few calls on his mobile phone in the corridor, and the call went through. "The jammer is sometimes on, sometimes off. Maybe it's not on now," the boys said.
One boy said: "The jammer makes people feel like they have a headache. Three or four students have this feeling."
The school has carefully considered and solicited opinions in advance
The relevant person in charge of the middle school told reporters that the school installed mobile phone signal jammers after careful consideration. There were four main considerations.
The first consideration is that some students will send messages to each other through mobile phones during exams, and even search for essays online to plagiarize. It is hoped that installing a blocker will prevent candidates from using mobile phones to cheat.
The second is that many students will lie in bed and surf the Internet after class or evening self-study. However, there is a lot of bad information on the Internet, which is very detrimental to students' growth and learning.
The third reason is that some students send text messages and make love calls after studying in the evening and before going to bed, which affects their study the next day. They are already high school students and are in a critical period.
Fourth, during the period after lights out for evening self-study, students are doing various activities on their mobile phones while lying in bed, and student administrators have no control over the students.
The person in charge said that in view of the above factors, the school chose to turn on the jammer to block mobile phone signals during the two periods of time after the lights are turned off at noon and evening self-study, "outside the monitoring line of sight", and the jammer was turned off at other times. He said that the school also considered that it could not affect the contact between students and parents, so it reduced the coverage of the jammer to only the dormitory buildings. "It will not affect the communication between home and school. The dormitories have fixed phones and IC card phones, etc. It will not affect the communication between students and teachers."
Before installing the jammer, the school did some research. The person in charge said, "The school sent a letter to parents, and many parents supported this approach." In addition, the school also held a mobilization meeting for students. Most students were in favor, but only a small number of students had opinions.
As for some students, they think jammers can cause headaches. The person in charge said that there is currently no scientific evidence that jammers can cause headaches, and the school will ask experts to investigate. If experts determine that there is an impact, the school should make adjustments, "everything must be based on the interests of students."
Parents understand that the school’s approach of not shielding is indulging.
The reporter randomly interviewed several parents, and most of them expressed understanding of the school's approach.
Parents of students who support the school’s approach believe that most mobile phones have game and Internet functions. If students are addicted to games and Internet access, it will affect their rest and prevent them from concentrating on their studies. There are all kinds of information on the Internet now, including some bad information. Frequent viewing of this information has a very bad impact on children. It is necessary for schools to block mobile phone information to protect students.
They believe that the main task of children is to study. If they need to contact home or friends, the telephones in the dormitory and campus are enough for them to use. They believe that excessive use of mobile phones is a waste of time, and mobile phones also provide convenience for early love. The school does not block mobile phone messages but makes them more indulgent.
Some parents also expressed different opinions. "Nowadays, high school students are 17 or 18 years old and have become independent. Will installing mobile phone jammers affect their freedom of communication?" Ms. Zhang, a parent of the student, believes, "Students learn on their own initiative, and the school's approach may be unilateral. ‘Wishful thinking’, restricting students’ use of mobile phones may not necessarily allow them to study with peace of mind.”
Education Department:
Protect students’ physical and mental health
More reasonable than “confiscating” mobile phones
Regarding this matter, Zhuang Yingduan, director of the Jinjiang Municipal Education Bureau, said that using mobile phones during breaks is not conducive to students' rest, and some bad information on mobile phones also has an adverse impact on their physical and mental health. The school blocks mobile phone information during specific periods to protect students' physical and mental health.
He said that mobile phones are not the only tool for students to communicate with the outside world. The school has installed fixed phones in student dormitories, and there are also magnetic card phones on campus. These phones ensure students' external contact. Blocking information on mobile phones during specific periods is generally conducive to children's rest and study, and most parents and teachers support this. It is understandable that students have different opinions. The school can publicize more to students and explain more to parents. When they know that this is conducive to protecting the healthy growth of students, they will provide understanding and support. Schools in other regions also have similar management measures, such as "confiscating" mobile phones, storing mobile phones, etc. Compared with these measures, blocking mobile phone information is more practical.
Lawyer’s statement:
No absolute freedom of communication
It is normal management behavior
Lawyer Zhang Chuanjiang, a member of the Zaobao Legal Advisory Group, believes that judging from the school's specific practices, the school's behavior of blocking mobile phones is a normal management behavior and does not violate relevant regulations. The school has installed fixed phones in each dormitory, and there are also magnetic card phones on campus. These tools can provide students with channels for external communication, without affecting students’ communication rights, nor the contact between parents and students.
No freedom is absolute, and there is no absolute freedom of communication. In fact, not allowing students to use mobile phones or bringing mobile phones into campus is a management method adopted by many schools, and it does not violate relevant education regulations. Properly regulate students' use of mobile phones, which is conducive to their learning and growth.
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