Category: Tag Classroom

In Germany, there is a clear rule: people who want to use frequencies need to be allocated. Therefore, according to the Telecommunications Act, users who use a WiFi jammer need to allocate frequencies. Schools are places where students learn in class. Do not use mobile phones here, so some schools have begun to buy and install WiFi jammers to prevent the use of mobile phones.

Where can I sell mobile phone signal jammers?

At present, there are more mobile phone signal jammers on the market. There is no difference between good and bad. Some time ago, I purchased one from Texin Electronics and placed it in the company’s conference room. The effect is very good.

Generally, one meeting room with more than 100 square meters on your side should be enough. If it is 600 square meters, it is better for you to find out.

Everyone knows that mobile phone signals will be shielded during the college entrance examination. So how much do you know about mobile phone signal jammers? Today, the editor of China Security Network will introduce to you the principles, characteristics, and appearance of mobile phone signal jammers. The problem.

indoor phone jammer

Introduction of mobile phone signal jammer

The cell phone jammer effectively shields all mobile phone signals of CDMA (China Telecom), GSM (China Mobile, China Unicom), SCDMA (Netcom Da Lingtong), DCS (1800MHz), PCS (1900MHz), PHS (Telecom PHS) and 3G Used in examination rooms, prisons, courts, conference venues, libraries, theaters, churches, gas stations, gas depots, gas stations, hospitals and other places that require confidentiality, quietness, riot prevention, and interference prevention.

Introduction to the principle of mobile phone signal jammer

The working principle of the mobile phone signal jammer is as follows: 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.

In view of the above 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 the working process. The scanning speed can cause garbled interference in the message signal received by the mobile phone, and the mobile phone cannot detect the normal data sent from the base station, so that the mobile phone cannot establish a connection with the base station. The mobile phone is manifested as a search network, no signal, no service system and other phenomena.

Features of mobile phone signal jammer

Only shield mobile phone signals, and does not affect the normal operation of other electronic devices
Only shield mobile phone signals in the examination room, no interference to mobile phones outside the examination room, let alone the base station
Only shield the downlink frequency of the transmitting base station without affecting the uplink frequency
Green and environmentally friendly, the electromagnetic field intensity is far lower than the national standard, without any impact on the human body
The operation is simple, the antenna is installed correctly, and it can run automatically after power on

Problems and solutions of mobile phone signal jammer

1. Why is the shielding range different from that described in the manual when the shielding device is working?

Answer: The shielding range of the jammer is related to the strong electromagnetic field at the shielding site and the distance from the communication station. Generally the best is 200 meters away. The manufacturer has tested it under normal conditions, so the shielding range will be slightly different.

2. Will there be radiation when the mobile phone signal is shielded? Is it harmful to the human body?

Answer: Regarding radiation, as long as electronic products are large and small, there will be radiation. Any piece of electrical equipment will have radiation. Just like the mobile phones we usually use, it is inevitable that there will be radiation when leaning against our ears every day. The country has also set a standard for mobile phone radiation, and the radiation generated by our mobile phone signal jammer is much lower than the national standard, and it is not every day. Lean against the ears, so there is almost no harm to the human body.

How to use high-power test room signal jammer

The test room high power 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.

smartphone signal blocker

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. The 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 shield, the 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 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 a 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 with some electronic equipment, try to keep it at least 1 to 2 meters away from the following common equipment: audio, wireless microphone, radio, computer, TV, Wi-Fi router, etc.

The above are the precautions when using the test room signal jammer introduced by Jammer-mart. I hope it can help everyone.

What are the differences between ordinary mobile phone signal jammers and high-quality signal jammers?

Signal jammer, generally speaking, can be divided into ordinary shielding and high-quality shielding.

Ordinary shielding, its technical characteristics are mainly based on shielding principles, using a large number of low-power or high-power devices to fight against, staying on simple technical solutions.

gps wifi cell phone jammers

High-quality shielding, its technical characteristics adopt strong signal digital frequency hopping technology, which reduces radiation by 150 times compared with ordinary shielding technology; mainly outdoor shielding, reducing indoor radiated power by hundreds of times; multi-channel combined technology, full-frequency antenna replacement N frequency-dividing antennas are suitable for wireless remoteness, laying the foundation for distributed antennas; using distributed antenna technology, reasonable distribution of shielding power, dispersing the power signal, reducing antenna radiation, providing tens of times the efficiency, and eliminating dead spots and leaks ; Jike’s unique TD synchronization technology, for China Mobile’s 3G (TD-SCDMA) and 4G (TD-LTE) networks, only shields the downlink pilot time slot to prevent interference to the base station, obtained by the China Mobile and Radio Management Committee The recognition, while reducing radiation dozens of times.

Comparison item Normal shielding Quality shielding
Low price moderate price
Technology
Basic shielding principle
Run by quantity
1. Digital dot frequency/frequency hopping technology
2. Multiplexing technology
3. Distributed antenna technology
4. Jike TD synchronization technology
Installation location is uncertain Outdoor
Radiation big radiation small radiation
Effect
1. Cannot fully shield
2. Large interference:
To surrounding/base station
3. Unstable operation
it is good
Service life is shorter than three years

6 ways to prevent decoder theft

When the car owner locks the car, it intercepts the decoded signal sent from the car’s key to the car’s central control lock device, analyzes the frequency and data in it, and copies this signal to control the car door lock and easily steal the owner’s car or car property.

The car GPS jammer has a low technical content. The principle is to send out a frequency similar to the original car key signal, and the signal is strong, covering the original car key signal, making the vehicle unable to lock the door, and taking the opportunity to steal the property or the vehicle after the owner goes away .

car gps anti track blocker

“This kind of device is a decoder, rather than a codecutter, because it mainly relies on intercepting the signal to copy the signal.” Master Su said, the public need not be too panic, because only when the owner of the car is opening or locking the car, it is illegal. Only the disciples can take advantage of it. However, in order to avoid property damage, Master Su reminded the majority of car owners to be more careful when parking.

Learn the following 6 tips to reduce the chance of theft of vehicles and their belongings:

1. When you lock the car, pay attention to whether there are suspicious persons within 10 meters.
2. When locking the car, the owner should not be too far away from the car to reduce the range of sensor sensing by the decoder.
3. When using the car anti-theft alarm, install a mechanical anti-theft device and install several concealed locks, such as steering wheel locks and gear locks, so you are not afraid of any decoder.
4. Look for a more side-by-side anti-theft method, do not install the anti-theft device in a fixed position, which increases the time of the thief’s crime, and the thief will lose patience, thereby reducing the chance of successful theft.
5. Load the GPS global positioning system on the car. Even if the car is stolen, the police can quickly locate the stolen vehicle and retrieve the stolen vehicle as soon as possible.
6. It is still necessary to emphasize that you should not put valuables such as leather bags, mobile phones, cash, etc. in the car to avoid losses caused by criminals.

The influence of magnetic field strength on test signal jammer

I believe many people are unfamiliar with the test signal jammer. This is a kind of equipment that has become popular in major examination rooms in recent years. It can effectively prevent candidates from cheating by using electronic signals. It has been widely used now In the university and middle school exams in major schools. Especially in the upcoming college entrance examination season, major schools have to re-purchase a batch of more professional machines and equipment with stronger shielding effect to ensure the normal order of the examination room and maintain the fairness of the examination. However, what we are going to talk about today is , Regarding the influence of magnetic field strength on the test signal shielding device.

Camouflage handheld phone jammer

As we all know, the effective range of the test signal jammer is generally about 0 to 50 meters in radius. According to different models of different manufacturers, there will be differences in specifics. However, the strength of the magnetic field will actually affect the effective range of the test signal jammer. Yes, because it relies on the magnetic field to isolate the electronic signal, so in specific use, pay special attention to whether there is a base station within 500 meters of the examination room. If it is 500 meters away, it will generally not cause any impact. If it is within 500 meters, it should be judged according to the specific distance. So the best way is to actually put it into use, and then judge how many units need to be purchased based on the actual results. For those who want a stronger shielding effect and a larger range of machinery and equipment, you can contact Beijing Shenzhou Mingda for the price of signal jammers. This is a professional manufacturer and has many years of experience in research and development of test signal jammers. It has been developed for many years. Deeply recognized and trusted by customers, friends who want to eliminate electronic signal cheating in the examination room are welcome to contact and cooperate.

Playing with mobile phones while praying, priests install mobile phone signal jammers

Maybe you are thinking, is it really appropriate for Father Madonna to use a cell phone jammer privately? According to him, his actions have been supported by the local police. Obviously, not everyone is welcome to the priest’s measure. The owners of the local store are very upset. They claim that the priest’s signal blocker has interfered with their credit card machines.

cheap signal jammers

Now, people are increasingly unable to leave their mobile phones, even when praying. This problem has suffered from the priest Michele Madonna of the Church of Our Lady of the Holy Mountain in Naples, Italy. According to the “Daily Mail” report, the godfather finally found a solution-cell phone signal jammer. Madonna bought this device for $60. The priest said that he did this not because of his lack of patience, but the embarrassment he saw when he advised people to turn off their phones and concentrate on praying.

Maybe you are thinking, is it really appropriate for Father Madonna to use a cell phone signal jammer privately? According to him, his actions have been supported by the local police. Obviously, not everyone is welcome to the priest’s measure. The owners of the local store are very upset. They claim that the priest’s signal blocker has interfered with their credit card machines.

In some countries, the use of signal jammer is illegal. In the first half of this year, a man in Florida, USA, was fined $48,000 for driving around with a cell phone signal jammer.

Principles of signal jammers in those examination rooms

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

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

jammer signal device Powerful

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

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

Current situation and application of mobile phone signal jammer

Which one is better for the anti-cheating signal jammer for the college entrance examination? jammer-mart will answer for you. The high school entrance examination is the two exams that Chinese students will go through during the process of entering a higher education. In many cases, the high school entrance examination determines the future and fate of many people. Therefore, the high school entrance examination and the college entrance examination are widely valued by society, schools, and families. In the middle school entrance examination and the examination, the test room signal blocker must be installed in the examination room to prevent criminals from cheating. NZDC built-in antenna full-band wireless signal jammer (name signal jammer/disconnector/suppressor/cutter/isolator/conference information confidential machine) is our factory adopts foreign high-tech, mainly for domestic college entrance examination, adult college entrance examination, self-study exam and In the examination process of colleges and universities, some criminals use mobile phones to cheat, combined with the current situation of middle and high school students using mobile phones to send text messages randomly during class hours.

wireless signal blocker

As well as the troubles and noises caused by mobile phones in serious places such as political organizations, large, medium and small conference rooms of enterprises, concert halls, theaters and other serious places, high-tech products carefully developed according to the actual situation of domestic mobile communication. Within a meter range (50-250 square meters), cut off GSM/DCS/CDMA/PHS/3G (TD-SCDMA/CDMA2000/WCDMA)/4G mobile phone signals, 2.4GWIFI wireless signals and walkie-talkie transmission frequency bands UHF400-470MHZ, VHF135-175MHZM, Make the mobile phone unable to make and answer, the walkie-talkie cannot work normally, but it will not interfere with the work of other electronic teaching equipment, the mobile phone and walkie-talkie can be restored to normal use after leaving the partition. Clean the school and clean the meeting. Features of this test room type mobile phone signal jammer from jammer-mart:

1. GSM/DCS/CDMA/PHS/3G(TD-SCDMA/CDMA2000/WCDMA)/4G/UHF/VHF and other frequency bands

2. Use white built-in plastic shell, can be customized according to customer needs and color 3. Transmitting power 10W  4. Effective shielding distance adjustable from 1-30 meters (adjusted according to customer requirements before leaving the factory) 5. No damage to human body

Adhering to the corporate philosophy of pragmatism and integrity, we offer our customers and friends with products, technology and services. We are willing to develop together with our customers and industry peers and keep pace with the times, and we are proud of this!

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

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

Radio management

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

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

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

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

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

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

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

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

desktop signal blocker

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

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

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

The use of mobile phone signal jammer in gas station

When the battery of the mobile phone is started, when the bell rings, it can generate enough energy to cause a slight spark, which may cause a fire. Petroleum, chemical, security and other relevant departments have clearly stipulated that gas stations prohibit the use of mobile phones. It has been a long time since the introduction, but the current implementation is not ideal.

The equipment at the gas station is controlled by a computer. The signal from the mobile phone will affect the normal operation of the equipment and cause inaccurate measurement. More importantly, sparks will appear during the call from the mobile phone, which can easily cause a fire and cause an explosion at the gas station. The current mobile phone signal is almost everywhere, and all electrical equipment is surrounded by it. When the mobile phone is not in use, this kind of surrounded signal has minimal interference to other electrical equipment. This is because when the mobile phone is not in use, there is no data exchange between the mobile phone and the base station, and it is impossible to form a sudden change signal. The electrical equipment is surrounded by a relatively stable electromagnetic field, that is, a static electromagnetic field. The interference of this static electromagnetic field to the electrical equipment is almost zero.

When using a mobile phone, there is a data exchange between the mobile phone and the base station, which generates a random mutation signal, which causes a dynamic electromagnetic field to form around the electrical equipment. This dynamic electromagnetic field signal will induce a mutation interference signal, which is easy to Cause dysfunction of electrical equipment. Therefore, the gas station that is a fire-resistant area is not only strictly forbidden to use mobile phones in the station, but it is best not to use mobile phones within two or three meters around the gas station.

At the same time, gas stations should set up obvious signs prohibiting cell phone calls, and widely publicize safety knowledge, so that people understand that calling cell phones in gas stations is undoubtedly walking with the tiger. There have been many fires caused by the use of mobile phones across the country. A gas station in Henan caused an explosion when the driver used his mobile phone while refueling, causing a huge accident involving many deaths and injuries. There are also many fire dangers caused by mobile phones in gas stations in Shenzhen and Chongqing.

The dangers of using mobile phones at gas stations have attracted many attentions. Relevant departments in Beijing, Hubei, Inner Mongolia, Guangdong, Henan, Shandong, Jiangxi, Sichuan, Chongqing and other places have recommended the use of mobile phone signal jammers at gas stations under their jurisdiction. Sinopec and China National Petroleum Corporation have taken the lead in using mobile phone signal jammers at gas stations in some areas. In short, do you understand now? This is why cell phone signal jammers are used in gas stations, oil depots and other places.

Cell phone jammer is a mobile phone signal jammer specially developed and produced by adopting international advanced shielding technology to meet market demand. The equipment has undergone a brand-new upgrade, changing from 5 channels to 6 channels increases the shielding effect of the device itself on the signal. At the same time, the newly added 4G frequency band solves the disadvantages that other products cannot shield the 4G frequency band, and the shielding effect is better than other similar products. The shielding effect is stronger, the performance is more stable, and it is easier to be recognized and accepted by customers.

cheap signal jammers

When entering the working state, it can automatically form a shielding magnetic field within the specified range, forcibly disable the mobile phone signal, only shield the mobile phone communication signal, and does not interfere with other electronic equipment, which has become its rare advantage , The advent of mobile phone signal jammers may completely solve the harm to users caused by information leakage of communication facilities, allowing people to enjoy the speed and convenience brought by high-tech to mankind while ensuring the safety of their information.

It is mainly used in examination rooms, prisons, gas stations, mobile phone bomb prevention, oil depots, liquefied gas stations, detention centers, interrogation rooms, courts, labor reform teams, conference rooms, theaters, churches, libraries, school dormitories, special security and confidential occasions (Confidential offices, negotiation rooms, mobile vehicles, mobile politicians and business dignitaries guarding) scenes, etc., and mobile phone signal jammers are becoming more and more important in social life.