Category: Tags Cellphone

Mobile phones are now widely used. Common mobile frequencies include GSM, CDMA, DCS, PCS, 3G, and 4G. The frequency of mobile communications makes it easy for people to communicate with each other. But it also brought a series of problems, such as cell phone harassment, cell phone ring tones and cell phone security issues everywhere. In this case, cell phone jammers can help solve many problems.

South Korea accused North Korea of ​​jamming GPS signals

South Korean authorities said North Korea is using so-called radio jammer to suppress GPS navigation systems in border areas.

According to the authorities, it started about a month ago in several places at once along the border, but stopped last Thursday.

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This reportedly led to disruptions in the navigation systems of 110 ships and aircraft, as well as to interruptions in mobile telephony.

A spokesman for the South Korean ministry for the unification of the two countries called these actions by Pyongyang a provocation, Agence France-Presse reports.

South Korean media report that Seoul has accused its northern neighbor of jamming GPS signals for at least the fourth time since 2010.

At the same time, it is reported that, most likely, the equipment for signal suppression was supplied to the DPRK from Russia.

On Friday, the South Korean military reported that the DPRK had once again launched a ballistic missile at sea, despite international sanctions and criticism from world powers.

Last week, North Korea announced an artillery exercise simulating an attack on the official residence of the South Korean president.

The unit installed a mobile phone jammer, and nearby residents’ mobile phones were all’dumb’

Is the signal bad if the mobile phone fails to get out? Not necessarily! Recently, the reporter received reports from some citizens that the mobile phone signal was clearly full, but they couldn’t make calls. They complained to the operator, but the operator said that the network signal was OK. Later, I learned that it turned out that nearby units have installed mobile phone signal jammer for quiet or confidential purposes. As long as the jammers work, the normal communication of residents within one or two kilometers of the neighborhood will also be affected.

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After investigating, the reporter found that mobile phone jammers are being used privately by units or individuals. However, in accordance with relevant regulations, the production, sale and installation of mobile phone jammers must be approved by relevant departments; the management department stated that it will strictly investigate and deal with private production, sales and installation of jammers.

User complaint: mobile phone signal is full but unable to dial out

Mr. Fang, who lives in a city in the Pearl River Delta, and his neighbors recently discovered that the mobile phone communication near his home is always not smooth. A cell phone that clearly shows full signal is often unable to dial out near home. Mr. Fang reported to the local mobile operator many times, but the operator replied that the network was OK after many tests. Later, it was finally discovered that a gas station near Mr. Fang’s home had installed a mobile phone jammer for safety reasons. As long as the jammer works, mobile phones within a range of one or two kilometers will be interfered.

The reporter found out that many government agencies, movie theaters, concert halls, gas stations and other units in China have installed cell phone jammers for confidentiality, security or quietness. In the province, second- and third-tier cities in eastern and northern Guangdong are more common, and Guangzhou and Shenzhen are also used occasionally. A person in charge of the theater said that although the audience was reminded to adjust the mobile phone to vibrate before each performance, the effect was minimal, and the installation of a mobile phone jammer solved these problems.

According to the user’s “good wishes”, mobile phone jammers only cause interference to the downlink mobile phone signals within the range of the use unit; but in fact, because many mobile phone jammers have excessive working power and interfere with mobile phone signals in all frequency bands, they not only The user unit itself has also had a serious impact on the normal mobile phone communication of nearby residents, turning their mobile phones into intermittent “dumb”.

According to industry insiders, the working principle of a mobile phone jammer is to cancel out the electromagnetic waves of the mobile phone by emitting radio waves of the same frequency, so that the connection between the mobile phone and the base station is cut off and cannot be used. However, the performance of the mobile phone signal may be full. In this way, users in the same area at the same time find that the signal is full but cannot dial out and dial more desperately, which can easily cause the signal of the operator’s base station to be blocked, or even paralyzed due to overwhelming burden. .

Insiders: the use of mobile phone jammers must be approved

An industry insider told reporters that most of the mobile jammers sold through online channels and in various communication cities do not have the legal procedures for production and sales, and most of the units or individuals who buy mobile jammers also use them. I don’t know that the use of mobile phone jammers requires approval. The radio management departments of various localities stated that they have noticed that many units have produced and installed mobile phone jammers without authorization, saying that their actions violated the above-mentioned relevant regulations. Be severely investigated.

Blockage with jammers

A jamming transmitter sends a random signal (noise or pulses) with the greatest possible strength at a certain frequency and thus superimposes the original transmission. If jammers are used specifically, they are referred to as strategic jammer. These devices are also known as jammers and the process is known as noise jamming.

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Jammers are available for various radio protocols such as Bluetooth, WiFi, GSM, UMTS, LTE and GPS. Whereby the specific frequency of the radio protocols is disturbed. There are very simple and small devices that can only interfere with radio signals within a limited radius. For example, there is a small adapter for the car cigarette lighter with the function of interfering with the GPS signal. Portable devices with an integrated battery have a range of up to 20 meters under optimal conditions, depending on the version. Usually they can interfere with the signals in a room. Powerful stationary devices can have a range of up to 80 meters.

The use of jammers is illegal in Germany. They are primarily used by investigative authorities and the military services. Some of them are used in prisons to prevent illegal communication from prisoners. The challenge here is that no signals from outside are blocked, for example the cell phone signal to call the emergency call. Abroad, jammers are sometimes used in cinemas and theaters so that the events are not interrupted by a cell phone signal. Another use is, for example, the blocking of control signals from drones.

If such a jamming transmitter is used by attackers, it can be used, for example, to block the radio connections of surveillance cameras or window sensors of alarm systems. Therefore, interrupted connections must always be equated with an alarm. In addition, jammers can be detected by continuously testing a radio connection between two components with a cable connection. If the connection is interrupted, a jammer is active. Alternatively, but also more difficult to solve technically, the signal level, the strength of the radio signals, can be tested. If a new strong source is detected here, it could be a jamming transmitter.

Why the actual working range of jammers is different

Here we are going to talk about the scope of work of whining, which is one of the most controversial equipment issues on the Internet and is the concern of most of the customers.

We know that every storage device has a different restricted area, which has already been mentioned. In general, the higher the force, the longer the stagnation radius. And the higher the force, the bigger the size of the WiFi jammer, and they also need a cooling system. For this reason, desktop jammers generally have a wider range of interference than portable jammers. So before you buy a jammer, you need to determine the type of whine you will need and the storage area you want. Both should be considered, then you can get what you want.

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In the introduction of each interferer, we emphasized that the interference range of the jammer is only used as a reference, please anticipate the current situation. Jamming range depends on the local signal strength. Here we will try to explain why the manufacturer’s workspace often differs from the actual fact.

At the beginning, when the woe is made, it is tested. There are many necessary tests, such as battery life, transmission frequency, etc., including test congestion radius. The manufacturer always thinks that the test results are more effective than the actual range, as these devices are often tested in empty fields. They know that buildings and various concrete structures can impede the transmission of signals. And most of us live in big cities, we are surrounded by skyscrapers. While the local cell phone signal strength is also a factor of the impact. So don’t be surprised if your clogged device can’t block the phone within 30 meters of you.

Of course, you don’t have to worry about the woes that don’t suit your needs. There are many different types of signal jammers here. You can get what you want according to your situation. Like a general portable jammer, they have a very decent work area, especially if your main goal is to stop people around. I think they got to 5 meters which is enough, especially now that you are on the bus you want people to stop for a minute or two. Such a device will definitely help you.

Truth|Does the cell phone signal jammer affect the human body?

Generally, people have inexplicable rejection of wireless devices. They always think that the signals emitted by wireless electronic products will affect their health. So, today, let’s talk about whether cell phone signal jammers have any impact on human health.

First of all, concerns about radiation from electronic products have always been a controversial issue among the people. Because we know that all electronic products have radiation, but different products have different amounts of radiation. Generally, the equipment of regular cell phone jammer will be monitored by the National Center for Disease Control and Prevention before leaving the factory. At present, the National Standards of the People’s Republic of China “Electromagnetic Radiation Protection Regulations” (GB8702-88) and the People’s Republic of China Environmental Radio Wave Hygiene Standards (GB9175-88), according to the national standard radiation level requirements, are allowed only after manufacturers who produce electronic products have passed the test. sell. And after installation on site, it also needs to undergo radiation testing by the National Center for Disease Control and Prevention. For engineering sites that meet national standards, the National Center for Disease Control and Prevention will issue an electromagnetic radiation testing report.

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After testing, electronic products that meet the national standard radiation level requirements have no effect on the human body, so there is no need to worry about whether the signal radiation of the mobile phone signal jammer will affect the health of the body. In addition, according to the conversion of relevant data, the amount of radiation from the mobile phone to the human body should be the largest, and the radiation from the shield to the human body is almost negligible compared with the radiation of the mobile phone we use daily.

Jammer-mart is a manufacturer specializing in the production and operation of mobile phone signal jammers. It provides complete wireless signal jammers, mobile phone jammers, GPS signal jammers, wireless WIFI mobile phone signal shielding products and one station for school examination rooms, prisons, detention centers and other places. Type signal shielding solution.

For more information, please visit https://www.jammer-mart.com/blog.html

How smart home products steal your secrets

There is no doubt that the US’s information technology strength is in an absolute leading position in the world. This strength is not only reflected in the number of information technology talents, but also in the ability to research and develop information technology, control of information resources, and influence on the formulation of information technology standards. For example, the world’s largest professional network warfare unit is in the United States; the mainstream operating systems (such as Windows, MacOS, Andriod, etc.) installed and used in the world’s computers and smart terminals are all developed and designed by the United States; the world’s main 13 root domain name servers Ten of them are in the United States…It is no exaggeration to say that the United States has the power to monopolize the world in terms of information technology. Of course, this also includes the power to invade and monitor the world.

In addition to operating systems, smartphones, tablets, web cameras and other software and hardware that are often “visited” by hackers, household products such as routers, set-top boxes, smart cars, and even smart TVs, smart air conditioners, etc. cannot escape the fate of being invaded and monitored by the CIA . Take smart air conditioners as an example. In order to improve the user experience, some manufacturers have installed microphones inside the air conditioners to collect and feedback the noise generated during the operation of the air conditioners, and use this as a basis to improve the process to improve the user experience. The CIA can use its exclusive mining (not publicly disclosed or feedback to related manufacturers) or vulnerabilities that have been disclosed but not patched in time (such as zero-day vulnerabilities) to attack smart air conditioners and ultimately gain control. Once the intrusion is successful, the microphone used to collect the operating noise of the air conditioner becomes an eavesdropper that monitors the sound of the surrounding environment, making it impossible to guard against. For another example, by invading and controlling smart cars, the CIA can tailor “traffic accidents” for some key targets, which are silent and difficult to track down. The most frightening thing is that the malware developed by the CIA can bypass software that uses cryptographic technology to encrypt storage and communication, and directly obtain your communication information. It should be noted that the “bypass” here does not directly crack the data that has been encrypted by the application, but has been monitored and acquired at the beginning of the information collection and entry (not yet encrypted). Of course, if your smart terminal uses point-to-point encrypted communication at all times, the CIA will still be unable to receive the monitored information.

So you still need to know about mobile phone signal jammer, Jammer-mart.com will be your good choice.

Detailed introduction of mobile communication jammer

KZXJ-1D communication signal intelligent monitoring and cutting equipment is a series of electromagnetic interference products of Chengdu Anze’s national distributor, which can effectively shield CDMA, GSM, DCS, PHS, TD-SCDMA, WCDMA, CDMA2000, FDD-LTE in a certain place , TD-LTE, WIFI mobile phone signal and Bluetooth communication.

The mobile phone signal jammer adopts advanced shielding technology with completely own intellectual property rights, which shields the downlink signal of the base station within a certain range, so that any mobile phone (including 2G, 3G, 4G, WIFI) in the location fails to send and receive functions and cannot make calls. And answering calls, unable to receive/send text messages, and unable to access the Internet, so as to achieve the purpose of forcibly banning mobile phones. The mobile communication jammer has the characteristics of low radiation intensity, large interference radius and no interference to mobile phone base stations, stable performance, convenient installation, and harmless to the human body. It is an ideal product for purifying the mobile communication environment in specific places.

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The main function

1. It can quickly find the communication signal in the restricted area and have a signal alarm display;

2. It can block and cut calls, text messages, Bluetooth communication and wireless Internet access in the restricted area in real time;

3. It can detect the bug in this working frequency band and prevent it from working;

4. It can prevent the explosion of remote control bombs in this working frequency band;

5. It is convenient to set the attenuation of the received signal strength according to the requirements of the scope of use;

6. The decision threshold can be flexibly set according to the electromagnetic environment of the use area to ensure that no missed or wrong judgments are made;

7. The set judgment threshold and various values ​​have memory function, if the environment does not change, it can be used permanently, once there is a change, it can be reset flexibly; the device will automatically scan the local level when it is turned on.

8. The system has a complete self-check function, which is convenient for finding and finding faults.

Chinese company fined 34.9 million U.S. dollars for selling mobile phone jammers

Phoenix Technology News, May 27, Beijing time, according to foreign media reports, a man in Florida and a Chinese company CTS Technology were formally fined US$48,000 and US$34.9 million by the Federal Communications Commission (FCC), respectively, because of the man. Use signal jammers to prevent drivers from using mobile phones, and CTS Technology sells these devices.

Signal jammer may hinder the work of the emergency response team, thereby hindering public safety, so the use or possession of these devices is illegal.

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It is reported that for two years, the man named Jason Humphreys (Jason Humphreys) has been interfering with cell phone signals on Interstate 4 between Seffner and Tampa until 2014 Was caught.

At the time, MetroPCS reported that its signal towers would always be disturbed at certain times of the day, but in fact this is exactly the time Humphries drives to and from get off work every day.

The document shows that the FCC had planned to fine Humphries US$48,000 two years ago, and this week the FCC finally officially confirmed the penalty.

Humphries told the police that he had been using signal jammers in his Toyota vehicles to prevent other drivers from making calls while driving.

The FCC determined that this was an “unauthorized behavior, which used illegal equipment to cause deliberate interference.”

The fine for the Chinese company CTS Technology was much higher, reaching US$34.9 million. The FCC said that for more than two years, CTS Technology has been selling 285 signal jamming devices to American consumers through the company’s official website or third-party platforms, and falsely claimed that some devices have been approved by the FCC.

The FCC said the company sold 10 high power jammer to the committee’s secret investigators. They can interfere with signals such as mobile phones, Bluetooth, radio waves, and GPS, and some interference strength can even reach half a mile.

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FCC official Travis LeBlanc said: “In today’s mobile world, cellular networks, GPS and other signal jamming devices will seriously endanger communications, commercial operations and public safety. The promotion or sale of these devices to the public is illegal and will be severely punished.

China’s self-developed UAV jammer looks strange like a chainsaw

The first is discovery. Almost all current large-scale advanced drones use stealth design, which makes it difficult to discover their whereabouts. At this time, the long-wave radar is used. The current stealth drones are mainly effective for centimeter-wave radars, but for long-wave radars, drones are almost impossible to stealth. Long-wave radar can provide early warning and azimuth indication for stealth drones, laying the foundation for subsequent strategy development.

The second is interference. Utilizing ultra-high-power drone jammer to transmit strong electronic waves to the UAV, blinding the UAV’s radar, cutting off the “umbilical cord” connection between the UAV and the space-based satellite and parent base, making it unable to receive remote control instruction. * Is to take over. When the UAV’s accusation command is interfered by strong electronic waves, it will retransmit a fake GPS parameter to the UAV to make it fly according to the path desired by the trapper, and finally control it to land smoothly to the designated location.

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However, the theory is so, but in fact, because the enemy UAV also has information encryption and anti-interference methods, it is not easy to operate. All military powers are sparing no effort to develop technologies that can “trap” drones. For example, Russia’s “automobile field” is one of the few electronic countermeasure systems that can “trap” advanced drones. It consists of dozens of vehicles, loaded with radar, electronic jamming equipment, and ground command equipment, which can easily penetrate The enemy’s electronic jamming waves and avionics resistance.

Mobile phones bring safety hazards to gas stations

The number of small cars in Shenzhen is growing rapidly at a rate of 200 vehicles per day. How much do new drivers know about the safety regulations of gas stations? Yesterday, the reporter randomly interviewed several gas stations in the city and found that although the safety warning signs in the gas stations were very eye-catching, many drivers turned a deaf ear to the safety regulations such as banning mobile phones and turning off vehicles when refueling.

Most drivers have used their mobile phones at gas stations. How many people have complied with the safety rule of “turn off the vehicle when refueling”? The reporter interviewed several gas stations in the city and learned that 80% of novices often need to remind the fueler to stop the fuel when refueling. Old drivers generally do not need to remind the fuel to stop, but some old drivers do not want to stop the fuel because of trouble.

At the Sinopec gas station on Hongli Road, Ms. Huang from Meilin Village told reporters about her dangerous experience. Once when she refueled, she got out of the car without stalling, and the fueler reminded her to refuel after stalling the car. When she was refueling, her cell phone rang, and the fueler asked her to stand farther away to answer the phone. At that time, she felt a little unhappy in her heart, thinking that the fueler was very unkind. When she was standing far away on the phone, she suddenly heard a strange noise from the spray gun being refueling, and saw a sudden electric spark flashing from the front of the car. Although the spray gun automatically stopped refueling later, Ms. Huang was shocked. She told reporters that if it weren’t for the reminder of the fueler, it might have caused a catastrophe.

At a gas station near Liantang in Luohu District, 15 vehicles came to refuel within 20 minutes. Among them, 9 drivers were talking and laughing on their mobile phones while refueling. When the fueler was refueling a car, the driver’s mobile phone rang, and the driver picked up to answer the call. Although the fueler saw this scene, he did not remind the driver. On a pillar next to him, there was a post “No mobile phone use”. The striking goal.

During the reporter’s interview, two-thirds of drivers said they had used their mobile phones at gas stations, and many drivers even said they didn’t know this rule at all. A Mr. Zhu said: “I have never heard that calling on a mobile phone in a gas station will cause an explosion.” Many drivers think this is a big or small matter, and there is no need to make a fuss. Illegal operations can easily lead to accidents. It is common knowledge that fireworks are strictly prohibited at gas stations, but it is not clear to so many people that dialing or receiving mobile phones at oil depots or gas stations or refueling without turning off the flame may cause an oil and gas explosion. As more and more people use their mobile phones at gas stations and do not turn off the gas to refuel, relevant people warn that such illegal operations may become the fuse of an oil and gas explosion, and its danger is tantamount to playing with fire.

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A person from the petrochemical company said that the density of oil and gas around the vehicle will increase sharply when refueling. At this time, the electronic friction generated by the mobile phone in the transmitting or receiving state may ignite the gasoline and cause an explosion. In fact, the manual of general mobile phone products will indicate: Do not use the mobile phone at the gas station! At the same time, the reporter learned that only last year, gas stations in Yueyang, Zhengzhou, Changsha, Lanzhou and other places had exploded due to the use of mobile phones, causing serious incidents of casualties.