Overview of wireless signal shielding principle of signal jammer

Let’s take a look at the overview of the principle of wireless signal shielding of signal jammers.

The working principle of mobile communication is that within a certain frequency range, wireless devices (mobile phones, etc.) communicate with the base station through radio waves, and complete data and sound transmission with a certain baud rate and modulation method. When the mobile phone communicates, it communicates with the base station through the uplink frequency, and then transfers the signal to the mobile service switching center to realize the call. In the standby state, the mobile phone communicates with the base station through the broadcast control channel. Once there is a call demand, it will be allocated to the mobile phone service channel according to the specific conditions of the channel near the terminal through the request, so that the mobile phone can jump to the service channel to realize the call and data transmission . At the same time, wireless communication must ensure a sufficient signal-to-noise ratio to effectively receive and complete communication.

desktop signal blocker

According to the above working principle, the cell phone signal jammer is generally composed of power supply, electronic scanning control unit, segmented radio frequency module unit, amplifier unit, transmitting antenna unit and other parts. The scanning signal generated by the signal generator passes the inverter, enters the oscillator and modulates it to the mobile communication working frequency band, and then is amplified by the power amplifier and the voltage regulator tube controls the power. The amplified frequency sweep signal is transmitted into the air in the form of radio waves. Because the frequency sweep signal forms garbled interference in the message signal received by the mobile phone (increasing the proportion of noise and noise signals to the device threshold), the mobile phone cannot receive the normal data sent by the base station, so that the mobile phone cannot establish a normal connection with the base station, thereby causing the mobile phone to disconnect Base station communication network. The mobile phone exhibits the phenomenon of no signal and no service system in the search network, which achieves the blocking effect. The mobile phone signal jammers produced by our company can achieve super high shielding effect, safe and simple.

The interference power of the jammer is fixed, and the shielding radius of the unblocked space is determined by the path attenuation and the signal level of the receiving base station. To realize interference from mobile phone signal jammers to mobile networks, it is necessary to ensure that the signal field emitted by the jammer is stronger than that of the mobile signal in the interference area. The closer the interference location is to the base station, the stronger the field strength and the smaller the effective interference area. , The farther the interference location is from the base station, the weaker the field strength and the larger the effective interference area.

It can be seen that within a certain transmit power, the interference range depends on the field strength in the interference area. No matter how powerful the jammer is, as long as the transmit power is a fixed value, as the distance increases, the interference signal strength will gradually attenuate and lose Interference ability. The following table shows the comparison table of distance and path attenuation. Then the output channel power of the jammer, the base station signal level, and the coverage line gain can determine the theoretical coverage radius with reference value.

Mobile jammers can prevent Apple phones from monitoring us

Mobile devices such as smartphones and tablets are considered really dangerous devices because they contain a large amount of our private and sensitive information and have the ability to monitor us. There are many types of exploits and specialized mobile applications that can damage information stored on smartphones or tablets. By the way, the number of malicious mobile applications is increasing and the Android operating system is the leader among them. However, two issues remind us that not only is Android dangerous, but iOS is dangerous as well. We have come across a lot of articles, people said that the iPhone and iPad can monitor us, and these functions are preset by the manufacturer. But the cell phone signal jammer website sells a jammer which can protect the signals of cellphones, which can protect our cellphones very well.

Cell Phone signal Jammer

They said that iOS may contain Trojan horse applications that can collect and analyze user information, create photos and videos, and send all data to third parties. We can tell you on jammer-shop.com that this sentence is really not very clear, because in order to prove these words someone has to decipher the source code of iOS, which is the intellectual property of Apple Inc., and decipher it illegally.

But at the same time, there is a way to steal photos and video data from devices running iOS 6. The vulnerability is exploited in Safari browser. As long as it supports HTML5, criminals can use simple HTML code to steal data from it. This forces users to perform certain activities, but the backdoor exists. We hope it will be fixed in a future update. And the vulnerability does not require Flash or Silverlight plugins, so its range of use can be very wide.

It’s also worth mentioning that in September 2012, a hacker community called “anti-security” claimed that Apple was cooperating with the CIA and the FBI. The community also told them that in March 2012, they had hacked into a Dell Vostro laptop belonging to FBI agent Kristoffer Strangle. They found a file “NCFTA_iOS_devices_intel.csv”, which contained over 12 million unique device identifiers (UDIDs). Which UDID is related to device name, username, address and phone number. Isn’t that awful?

The FBI has officially denied the information, but independent experts have proven its authenticity. Hackers posted this information and many people found their names and devices on this list. Therefore, there are rumors that Apple’s gadgets might spy on us, which doesn’t seem strange and can’t prove it.

Another interesting fact here is that the unnecessarily collected photo and video information can be obtained through positioning data. Now, thanks to the integrated GPS / GLONASS module and the triangulation of the mobile phone tower, they can know the coordinates of each photo and even follow your position in real time. Thanks to the new positioning technology, you can see your position even in indoor areas where GPS is not available.

The realization of such data is possible thanks to the NAVSEA project developed by the army and the University of Indiana. This technology makes it possible to create a high-quality 3D model of the room where the phone is located. This is possible because the data from the accelerometer and the built-in compass are merged with the image itself. This model is much more useful for stealing sensitive data than a set of miscellaneous images.

Therefore, your mobile device may spy on you. Android already has several very dangerous applications, and now iOS has become fragile. It’s really hard to tell if the iPhone and iPad are spying on us, but it is best to consider protective measures before the danger arises, so it may be better to use a cell phone signal jammer. GSM / GPS to avoid tracking and avoid interference. Attempts to hide data transmission.

Good reasons for using cell phone jammers in cinemas and theaters

Usually, when entering a movie theater or theater, turning off the phone is the most basic ceremony. However, in any case, some people will ignore these rituals and rules. Yes, when you watch a movie, you are always interrupted.

Try to convince people to observe the most basic social considerations in the movie. If you have visited a theater recently, you know they are often overlooked, so other methods have been explored to enforce theater ethics.

For new and popular movies, the theater may have a separate auditorium to block cell phone use, but the auditorium does not block the signal. This is more like the tradition of non-smoking areas in restaurants. Although the use of mobile phones is still discouraged in closed auditoriums, those who choose to watch movies will have to deal with occasional distractions.

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Why use a cell phone jammer?

Hollywood film blogger Alex Billington (Alex Billington) is one of many people who rejoice in the rapid retreat of AMC. “Texting in the theater completely ruined the movie,” he said. “This is something we must fight on the social and cultural level.”

In 2014, a dispute between two men texting at a cinema in Florida eventually led to a fatal shooting. Although this is an extreme situation, most people would agree that the illuminated cell phone screen and finger taps can be annoying.

Phone calls are not just a hassle for movie theaters. When Benedict Cumberbatch played Hamlet in Barbican, he finally added a monologue, lamenting the tragedy of cell phone cameras and urging his fans to put down their phones. Some performers take the problem of disruptive technology completely in their own hands.

Have these people never participated in a movie so fully, or felt so deeply involved in a story that when something sounds or shakes or lights up a few seats, they don’t feel a momentary resentment, Smashed this spell? The problem started with a lack of respect for seat partners, or lack of respect for the entertainment media itself?

Of course, the reality is that all of these are important. In an era when we are forever consumed by our personal technology, the theater can and should be our last public refuge, and we can only be affected in movies and films. If that vision comes from a nostalgic or naive place, then this place is still a space for all of us, sitting proudly and provocatively in the dark.

Personally, I think theaters should be allowed to install cell phone signal jammer and there are clear signs that they are being used. If people don’t like this, they are free to spend money elsewhere. If all theaters eventually use the technology, then these people can choose not to go to the movies.

Delhi government to install cell phone jammers in exam centers

It is common for jammers to be installed at investigation sites.

The AAP government has decided to install signal jammer to prevent high tech electronic equipment from being cheated on exams that are held for government agencies in Delhi. Stop being cheated during exams. The increased use of electronic devices in written tests has made the city government concerned about the possibility of incompetent candidates joining the government. “After the Delhi Subordinate Services Selection Board (DSSSB) successfully used the jammers in an auditor test a few months ago, they decided to use the device in their critical tests,” a government official told IANS.

smartphone signal blocker

The DSSSB was founded in 1996 and conducts written tests and interviews for middle and lower positions in the state government and in city authorities. A cell phone jammer is an instrument that prevents cell phones from receiving signals from base stations. When used, the jammer effectively disables cell phones. It transmits on the same radio frequencies as the mobile phone and interrupts communication between the phone and the base station of the mobile phone in the tower. “Nowadays students are using technology to pass exams which is the other side of technology. They remember ‘Munna Bhai MBBS’, don’t they,” added the official, referring to the Bollywood film in which the protagonist is featured – a local crook – is shown undergoing a medical examination with the help of a small earphone. “Applications were invited by various phone jammers service providers,” said one official.

According to the tender, the agency must ensure that a sufficient number of jammers are deployed and installed to block cellphone and blue tooth services in the exam center. Another requirement is that jammers, with or without a power supply, work without technical interference for the entire duration of the tests. There are various gadgets available in the market that can be customized for salwar kameez sets, sports bras, jackets, shirts, and regular buttons. In May, the Supreme Court ordered the center to install telephone jammers in exam centers to prevent paper leaks and other abuses. The guideline was created after an alleged fraud in the All India Pre-Medical Test (AIPMT). Many aspirants had SIM cards sewn to their shirts and had bluetooth devices. Over 350 calls were made to the various exam centers.

Signal jammers to improve concert grade

As for the effect of the concert, many people are now listening to mobile phones, which has led to various interferences. If you listen to music and find that you don’t have a signal cell phone, talk to your administrator and you’ll find a dedicated cell phone signal jamming device here. Several concerts didn’t go well. When an overseas guest arrives, it rings the mobile phone and affects the overall effect of the concert. It gives a bad impression to international friends. Install a cell phone signal jammer to improve the grade of your concert.

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The concert hall is a very independent small space. It has a very elegant atmosphere of music and art. The audience sees the concert and it’s a very good experience. Introduce jammers at this location. Create this new environment. Manage mobile phone signals within a specified time. Providing a feast of music to the viewer. Out-of-service devices can hang up mobile phone calls by emitting jamming radio waves from the mobile phone. If the frequencies are different, it cannot be disturbed. The range of communication suppression effect is limited to a small space.

Many people think that this is because the announcement “Please turn off your mobile phone” came in before the performance started. It is a telephone deterrent device that intentionally makes the radio waves of mobile phones in the area “out of service area”. Prevents mobile phones in the area from communicating with the base station. wifi interference means that it can cover an area of ​​about 50 meters in diameter.

Jammer invalidates ultra-precision weapons

Arexis jammer has the ability to filter and thus protect the approach and departure of entire strike formations from low frequency radars through the intelligent use of DRFM jamming techniques, such as smart noise, false targets coherent and various saturation techniques.

But the service still kept MAPS in the background. Its goal was to develop an open architecture – the MAF (Modular APS Framework) – which could be used on any current or future armored vehicle to plug in and use the best radars, cheap gps jammers, and death shooters from different vendors. This way, the military can easily update vehicle protection with new technologies available from all vendors.

The GPS jammer is a little more difficult when the trajectory is made several kilometers away. American Missiles Ballistic missiles usually have their destination in mind long before they are close to the target. They also have a nifty method of calculating distance to target that is not dependent on GPS as they get closer. Even so, GPS disturbances are very difficult on a large scale. But it’s not too difficult to make minor changes, just enough to render super-precise weapons ineffective. When you know someone is going to be operating in a very specific area, like the ships we broadcast around the world. Or, say, one of our stealth drones that we kept flying in the same reconnaissance mission over and over again (looking at Iran). It’s easier to fuck. Because you know pretty much exactly where they operate, so you can focus on that specific area. It’s easy to fuck with practice ops.

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Thus, weak radar cross sections and radar absorbing materials will be a necessary, but not sufficient, characteristic of sixth generation fighters. Some theorists argue that advanced sensing technology can eventually render stealth cells obsolete – and they can’t be upgraded as easily as avionics and weapons. Therefore, jamming, electronic warfare, and anti-infrared defenses will also gain importance.

The fusion of sensors and optional management, however, means that the sixth generation jets rely heavily on data links and networks that could be disrupted by jamming or even invaded by hackers. Ground logistics networks, such as the F-35’s ALIS system, promise to dramatically improve efficiency, but even expose aircraft on the ground to a possible cyber attack.

The B-52 weapons developers added that a second element, slated for completion by 2022, would incorporate more modern or advanced weapons, such as the remote air-to-surface missile, or the JASSM, the JASSM Extended Range (ER) and a technology called Miniature Cast Lure, or MALD. A variant of the MALD-J “jammer”, which will also be integrated into the B-52, can also be used to block enemy radar technologies.

Legal notice on mobile jammers

The gsm signal jammer (JAMMER) is products capable of eliminating the cellular signal, in the range that goes from a few meters to about a kilometer, in some cases causing real inconvenience for anyone who happens to be within its range. Precisely for this reason they are products considered ILLEGAL in our country as in many others in the European community.

Response of the EU Commission to the EU Parliamentary Question E-2651/02 (Cell phone deactivation systems).

Reply from Commissioner Liikanen on behalf of the EU Commission (31 October 2002)

Research carried out by the Commission indicates that it is currently not allowed in the Member States to block the reception and transmission of GSM signals. Although France has adopted a law that prepares the ground for the use of inactivation systems, there are still no technical implementing regulations that allow the legal use of such devices (mobile phone jammer). The Commission is aware that inactivation systems are currently commercially available, in particular via the Internet.

12 Antennas Signal Jammer
Such products are illegal and Member States are therefore required to take measures in this regard pursuant to the provisions of Council Directive 89/336 / EEC of 3 May 1989 for the approximation of the laws of the Member States relating to electromagnetic compatibility or Directive 1999 / 5 / EC of the European Parliament and of the Council of 9 March 1999 concerning radio equipment and telecommunications terminal equipment and the mutual recognition of their conformity, withdrawing them from the market. As the answer to Written Question P-2753/02 by Mr Caullery indicates, the Commission does not believe that inactivation is the right solution to the issue of inappropriate use of mobile phones. The Commission therefore does not intend to submit legislative proposals aimed at legalizing the use of inactivation systems.

In ITALY, those who use these products can interrupt a public service such as that of telephone transmission and therefore punishable by criminal law:

340 of the Criminal Code:
Interruption of an office or public service or a service of public need.
Anyone who, apart from the cases provided for by particular legal provisions, causes an interruption or disturbs the regularity of a public office or service or a service of public necessity, is punished with imprisonment for up to one year. The leaders, promoters or organizers are punished with imprisonment from one to five years.

617 of the Criminal Code:
Knowledge of illegal interruption or impediment of telegraphic or telephone communications or conversations.
Anyone who fraudulently becomes aware of a communication or conversation, telephone or telegraphic, between other people or in any case not directed to him, or interrupts or prevents them, is punished with imprisonment from six months to four years. Unless the fact constitutes a more serious crime, the same penalty applies to anyone who discloses, by any means of information to the public, in whole or in part, the content of the communications or conversations indicated in the first part of this article.
Crimes are punishable upon complaint by the injured party; however, the procedure is ex officio and the penalty is imprisonment from one to five years if the offense is committed to the detriment of a public official or a person in charge of a public service in the exercise or because of the functions or service, or by a public officer or a person in charge of a public service with abuse of powers or with violation of the duties inherent to the function or service, or by whoever exercises the profession of private investigator even illegally.
Article thus replaced by article 2 of l. 8/4/1974 n. 98.

617 bis:
Installation of equipment designed to intercept or prevent telegraphic or telephone communications or conversations.
Anyone who, outside the cases permitted by law, installs equipment, tools, parts of equipment or instruments in order to intercept or prevent telegraphic or telephone communications or conversations between other people is punished with imprisonment from one to four years.
The penalty is imprisonment from one to five years if the offense is committed to the detriment of a public official in the exercise or because of his functions or by a public official or a person in charge of a public service with abuse of powers or violation of duties inherent to the function or service or by whoever exercises the profession of private investigator even illegally.

How to inhibit the signal of a mobile phone?

The technology to inhibit a mobile phone exists and, if one has the soul of a saboteur, it can be purchased on the Internet for a few tens of dollars in the market. A frequency jammer consists of a small device that emits an electromagnetic wave that cancels the frequency of the mobile phone in an area of ​​tens of meters. Their use is usually restricted by law since they are used by state forces for protection work or by organized gangs of thieves in the theft of vehicles or houses.

There is also the possibility of acquiring the technology for the opposite. A frequency inhibitor detector allows detecting a burglary attempt when intruders want to disable an alarm in a home for example. It is a service that alarm companies market, reaching the contradiction that they sell it as an additional service to cover a vulnerability in their own protection systems.

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The mobile phone jammer not only work for mobile telephony but can also cancel the WiFi signal, GPS, radio, road radars, etc. But not all electromagnetic signals are equally easy to inhibit. Communications that use several radio transmission channels at the same time are more robust to attacks.

The inhibition of electromagnetic signals is very close to listening or spying on communications, reaching its maximum expression with the so-called ECHELON network that brings together English-speaking countries in an immense global communications listening network. It was conceived in times of the cold war and continues to be used to fight terrorism and industrial espionage, causing suspicion in civil society for its lack of legality and transparency.

The limit on cell phone signal inhibitors for workers

A ruling that prohibits companies from using signal blocker to interfere with workers’ mobile phone communications at their workstations was recently issued by the Labor Directorate (DT).

The doctrine in this regard was established by ordinary 2315/54, which responds to a query about whether it is possible for a company to install devices that block workers’ cell phone signals within the company.

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The DT’s ruling concludes that said company “cannot interfere, intercept or interrupt the signal of the cell phones of the workers inside the company.”

To conclude, the DT turns to constitutional, labor and international norms, whose joint understanding is an active defense and promoter of the fundamental rights of workers, in this case, that of their intrinsic dignity.

Thus, it recalls that article 19 number 5 of the Political Constitution of the State assures everyone “the inviolability of the home and of all forms of private communication, linking it with article 5 of the Labor Code which provides that“ the exercise of the powers the law recognizes that the employer is limited by respect for the constitutional guarantees of workers, especially when they could affect their privacy, private life or honor ”.

Internationally, the statement includes the provisions of the American Convention on Human Rights and the International Covenant on Civil and Political Rights.

Both instruments affirm that “no one may be the object of arbitrary or illegal interference in his private life, his family, his home or his correspondence.”

For DT the term “correspondence” should be understood as a written communication form, given the time in which these international treaties were drawn up, and also because both standards protect fundamental rights and “should be interpreted in a broad manner, understanding that the protection contemplated the concept of correspondence encompasses all forms of communication ”.

Likewise, a report from 2002 is recalled that includes what was stated by the jurist José Luis Cea regarding the inviolability of private communications encompassing letters, telephone, audiovisual and even e-mail, “provided they are not open to the public” .

Thus, the DT maintains that for the privacy protection to be in force, communication must be a private act between specific or determinable persons who are the victims of an illegitimate or arbitrary interference in communications.

In the specific case, the DT also required a technical statement from the Undersecretariat of Telecommunications.

22 Antennas Wireless Signal Jammer

In its response, the Undersecretariat reported that “the so-called Inhibitors or Signal Blockers, also known by their English term“ wireless jammer ”, and consist of radio devices that produce an intentional interference or disturbance of a communication, in order to avoid the exchange of information, between two or more parties, thus not allowing calls or data transfers, such as messaging services, Internet access or similar ”.

Even the General Telecommunications Law 18,168 criminally penalizes interference, interceptions, interruptions or unauthorized captures of a telecommunications service.

In this way, concludes the opinion of the DT, “the installation of devices that interfere, intercept or interrupt any form of communication that workers have in the orbit of their private life within the company, not only constitutes a violation of rights fundamental, but also constitutes a crime of public criminal action ”.

Can you protect yourself in this smart phone world?

Read this carefully and remember: from now on you will be watched. Does it sound awesome or scary to you? Take a good look at the stranger at the other end of the hall. Although it looks like he’s talking on his smartphone, he actually takes pictures of you using a special app. And thats just the beginning. At that morning meeting last Tuesday, when you made that outrageous joke about your new boss, your colleague’s smartphone, lying quietly at the table, recorded every word you said. Later that night when you were in the restaurant and made a flirtatious but innocent joke on the waitress, someone videotaped the entire interaction.

At first glance, it seems that there is nothing you can do to prevent things like this from happening again and again. Millions of smartphones around the world mean millions of active recording devices ready to quickly capture any word or movement. And when these recordings are made, it is no big deal to throw pictures, videos or audios on the internet and share them with everyone. Maybe there is some way to prevent all of this from happening? Let’s see. Perhaps someone smart enough will create a cloak of invisibility like in fantasy films, or companies may use clues from James Bond films and develop high-tech counter-surveillance devices that allow us to move around in public without worrying about potential privacy issues having to worry.

In fact, it might be the companies we already know well, especially since there is already some type of technology that I am talking about. For example, late last year Apple patented a new technology that allows an iPhone’s camera to be easily deactivated using infrared sensors aimed at the camera. It was developed to prevent film piracy. But even ordinary people can use such a device in advance. Todd Morris, founder and chief executive of surveillance and surveillance company BrickHouse Security, said some early technologies existed to protect people from intentional recording. For example, any woman can use a wireless camera detector in the locker room to find out if a hidden camera is installed in her clothing. Yes, that happens and quite a bit.

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There are some limits, however, as the changing room or business office is completely different from the large and crowded public place. For example, if you use this Apple device that disables the camera, you will definitely make a lot of people feel harassed just to imagine some sights or to take photos to remember friends. The same is partly true for gsm jammer, but it can vary from place to place (for example, the cinema must definitely have such devices in order to make the visitor’s experience uninterrupted and thus even better).

“While you don’t wear a fake mustache or stocking over your head, no one in a large crowd can prevent them from being secretly pictured,” claimed Todd Morris. “In these cases, we need to use our technology to fight technology only at the server level using algorithms that say,” Don’t post this photo of me on the internet. “” If these companies can tag someone on the internet by simply recognizing their voice or even their face, they should be able to remove them the same way. However, when everyone starts using those Google glasses and other augmented reality glasses, we will face the new type of surveillance as they are likely to record everything they see.