As you know, every action has a reaction. So, since the first communication system appeared, all kinds of ways have appeared that make it possible to effectively interrupt it.
It does not matter at all whether it is a conversation on a mobile phone or a banal wireless connection - absolutely any radio connection can be jammed.
The radio stub principle itself is not complicated. To do this, it is only necessary that the operation of the receiving antenna be disturbed by interference, which will be comparable to the signal in terms of level. Using such a banal and simple scheme, you can easily jam any signal, be it broadcasting or mobile communications.
Let's plunge a little into history and remember how in the days of the USSR all friendly countries were surrounded by dozens of radio stations of the enemy type, which broadcast from everywhere. Soviet radio suppression at that time was directed primarily at Radio Free Europe. Anti-Soviet programs that literally destroyed the human brain were broadcast from every corner of the world.
Absolutely every country at one time used special jammers in order to suppress the enemy's communication signal. It is clear that the USSR, since it was the founder of radio communications, has reached considerable heights in this area.
You need to understand that at that time the network of radio jammers was better distributed throughout the USSR than the Internet is today in Russia.
It is clear that it will not be difficult to drown out the radio today, if we take into account the technologies that the modern world can boast of. But, since it is much easier to “calm down” annoying media by order than by noise, a new victim of jamming has appeared in the 21st century - mobile communications.
They jam mobile communications quite often, although we sometimes don’t know about it at all. The average person can come up with anything:
This does not mean that you are being jammed because they want something from you. Jammers can work in places where special operations are carried out or near government highways. You can detect network jamming in:
And there is absolutely nothing surprising in this today, because in public transport a person can stand or sit with you, who will have a jammer in his bag, which is activated to suppress the mobile network.
You may ask why this is done, because a cafe and a public bus are not a place for business negotiations. Why turn on the muffler? The answer to this question is tritely simple: for your own peace of mind. Just imagine that in a crowded bus next to you will be, say, a man of "undershare" who decides to "divorce" his wife over the phone. Wouldn't you beg him to speak more quietly because it annoys you, or swear at him? That's right, it will be much more effective if you press just one button with a slight movement and the person's mobile connection will be lost.
At the beginning of this article, we already talked about the fact that you can drown out anything where the radio channel will be used. If you are an ordinary person, then you may suffer slightly from your neighbor’s hooliganism, noticing that the things you are used to have stopped working.
In addition to mobile communications, today you can easily drown out the car alarm. To achieve this goal, you can use both home-made and special devices. Please note that if you try to close the car, the alarm key fob flashes, but nothing happens, then someone nearby is trying to silence your alarm.
Again, it's hard to talk about bad goals here. Of course, car alarms can be silenced in order to steal a car, or maybe because a siren “screams” under the window all night and does not allow a small child to sleep.
Whatever goal you pursue, if you need a communication jammer, you can always purchase it in a specialized store or on the Internet portal. The main thing is to initially decide for what purposes you will use it, what you will jam:
Depending on the goals presented, you will need to select a device model that fits the required parameters: perhaps you will need a weak jammer that will suppress the radio transmitter signal, or you will need a more powerful option. It is important to remember that it is recommended to use such devices only for good purposes, so that it does not turn out that in the end you harm yourself.
The Internet community is increasingly interested in creating a do-it-yourself cell jammer, and in particular, many want to know how to make such a device yourself. And many sites satisfy this curiosity by providing their own variations of schemes. This article also contains instructions from which you can learn how to create your own GSM jammer with your own hands. The main thing is not to forget about the complexity of the process of creating such a device. In order to create GSM jammers with your own hands, you need certain skills in working with electronics.
There are only three of them:
To create a do-it-yourself mobile phone blocker, it is recommended to use the second method. Spoofing is too complex for the average user to use such a device. And the electromagnetic screen cannot be moved, so the possibility of mobility is completely excluded. That is why it is best to use a DoS attack. Thus, it is possible to jam all mobile devices within the range of the communication jammer.
In fact, the assembly of a GSM jammer is a combination of some parts together. All you need is:
VCO - the most important part of the GSM jammer, which will create with your own hands, it can be said, its heart. It produces a signal that affects certain devices, blocking its operation. In order to determine what frequency to tune the generator to, you need to know the exact frequency at which the muted device operates. This will help increase efficiency, although the jammer will create problems even when operating at just a close frequency. Think in advance about what size you plan to create a suppressor with your own hands. It can be a portable cell phone jammer, or a do-it-yourself desktop cell phone blocker.
The tuning circuit can be open-loop, or with feedback. It is much easier to make an open-loop system, but feedback systems have their advantages. The first scheme uses sawtooth oscillations from the lower frequency to the upper one. The second circuit uses a PLL, which allows you to keep a stable frequency of the generator. In the second case, you will need to use a programmed controller, which must be configured correctly, because. setting will not be possible later.
To expand the coverage area of the frequency suppressor, its power, it is necessary to use a frequency amplification unit. With an increase in the power of the suppressor, the suppression zone will expand, but at the cost of operating time. The more powerful the device, the faster the battery will drain. This feature should be taken into account when choosing a model of the amplifying stage.
The antenna transmits the signal generated by the jammer. The antenna is characterized by the Voltage Standing Wave Ratio (VSWR). It is best to choose an antenna with an VSWR of 3 or lower. Thus, the return loss of the antenna can be minimized. It is best to use SMA antennas, which can be easily replaced with others, or removed. Also consider the fact that it is better to buy an omnidirectional antenna, otherwise you will have to point it at the muffled object, like a TV remote control.
And, of course, our do-it-yourself jammer will not function without a power source. Normally, 5VDC is enough for a mobile phone jammer. You can use a conventional lithium ion battery. In order to be able to use a standard power supply, you will also need an AC adapter.
Typically, two types of network adapters are used:
Despite the high cost, as well as the difficulties that arise, it is still better to use a switching stabilizer. Temporary, financial costs are fully justified. AC and DC adapters can be found for almost any cell phone jammer.
Older models are easier to suppress because their operating power is lower. Therefore, the range of the jammer will expand significantly. But, new mobile phones are somewhat more difficult to drown out.
For powerful GSM jammers, it is worth installing cooling systems so that they do not overheat.
With sufficient skill, dexterity and experience, and access to the necessary equipment, a PLL system can be programmed to control the operation of the muting device.
Actually, that's all. All the basic information that is needed in order to understand exactly how a GSM jammer is created is indicated.
To buy portable jammers, you need to get to the appropriate section of the site.
Deputy Director for Development Kerimov Rostislav.
Such suppressors and jammers of mobile phones have a different radius of action. The simplest of them work a maximum of ten meters. Others are perfect for a small room or car. We will not consider more powerful suppressors in this article, because their use can lead to serious consequences.
Thanks to such devices, it is quite easy and simple to protect yourself from various spy tricks, which are almost impossible to detect due to their miniature dimensions, but such jammers can quite cope with a probable problem.
The basis of the design is a broadband noise generator ideal for cellular and mobile signal jammers.
With properly selected transistors and increased power supply voltage, the Tetra-Fast cell jammer circuit can safely leave mobile phones without a gsm signal. The jammer has been tested in operation, is quite simple to set up and manufacture, the number of radio components has been reduced to a possible minimum.
The range of emitted frequencies is from hundreds of kHz to 1 GHz. The circuit is so simple that, under conditions of proper assembly and serviceability of the radio components, it starts working immediately from the moment power is applied. Structurally, the device has two outputs - standard and high power. The use of a powerful output increases the current consumption and overheating of transistors, so they must be placed on good radiators.
The installation of radio components should be carried out taking into account the basic requirements for microwave devices: compact installation, wide printed conductors and a minimum length, exclusion of sharp turns, right angles on the board, capacitances must be high-frequency, etc.
We connect a three-frame antenna to the output of the device, but in principle it is easy to get by with one frame - depending on the specific conditions.
After assembling the circuit, it is necessary to check the correct installation, connect a piece of meter-long copper wire to any output and turn it on.
The device provides excellent suppression of emissions from low-power transmitters in the range of 30 MHz - 1000 MHz. Bipolar transistors VT1-VT4 require heatsinks. Resistors R1 and R2 can be replaced with one 4.7 ohm 10 watt.
I got the parking of some uncomprehending drivers in the flowerbed near the house. There is a simple and legal way to teach them a lesson, namely: to assemble a simple scheme for influencing a car alarm. And after that, the car induced within the range of the device cannot be set or removed from the alarm.
In some cases, it may be necessary to generate large interference to TV and radio receivers. For example, the wife watches a stupid series, and we want to watch football. For this purpose, you can assemble a TV range jammer. Its feature is a small range of about 50-100 meters and a good ability to jam the signal in a wide frequency range. In this case, the image and sound on the TV completely disappears.
Every day we are surrounded by more and more technology that works using wireless networks: mobile phones, smart home gadgets, car alarms, unmanned aerial vehicles.
Unfortunately, these devices are easy to disable. A simple device for a few thousand rubles can neutralize a burglar alarm or cut off cellular communications in an entire office.
If you live in Moscow, then you meet with this regularly in the city center.
In this article, you will learn what kind of household radio frequency suppressors are and for what purposes they are used.
Warning
Jammers can be easily bought on the Internet, but they should only be used with the permission of Roskomnadzor. You can read more about the process of registering radio frequency suppressors in the document Registration of RES and VChU.
Responsibility for violation of the rules for registration of RES and VChU is prescribed in Article 13.4. Code of Administrative Offenses of the Russian Federation. Violation of the rules for the design, construction, installation, registration or operation of radio electronic equipment and (or) high-frequency devices. Individuals are at risk fine up to 500 rubles and confiscation of the device.
The general principle of operation of all jammers is very simple: they emit a signal in the same frequency range as the device that needs to be suppressed. A field of "white noise" is created around the jammer, in which signals from other sources are lost.
Stationary mufflers. These devices are designed to be used permanently in one place and require a network connection to operate. They weigh several kilograms and can simultaneously generate "white noise" on ten or more radio frequency bands.
Portable jammers. Such devices can be carried in your pocket and discreetly turned on as needed, without attracting the attention of others. The battery life of such a device is 1-3 hours.
Portable jammers weigh, on average, 300-700 grams and combine 3-6 antennas to suppress different radio frequency bands.
Cases-blockers. Since the 90s, there have been many legends about the "police mode" built into each GSM phone, which allows the mobile operator to monitor the movements and listen to the conversations of any subscriber.
Usually in such cases there are two compartments. The first compartment is designed to completely block signals, and the second to protect against harmful radiation.
In many countries of the world, high-ranking officials and intelligence officers use specially assembled mobile phones. In Russia, for employees of secret departments, cryptophones SMP-ATLAS/2 and M-549M.
And now let's take a closer look at why suppression of signals in different frequency ranges is used in practice.
In most cases, cellular jammers are purchased to protect premises from wiretapping using GSM bugs. With a cell phone jammer, you can create silence in the hall at a mass event by blocking incoming calls.
It is possible that soon a law will be passed in our country, according to which cellular communication jammers will be installed in prisons, in schools during the exam, in university auditoriums, theaters and other public places.
Frequency bands:
GSM900: 925-960MHz
GSM1800: 1805-1880MHz
3G: 2110-2170MHz
4G WIMAX: 2570-2690 MHz
4G LTE: 791-820MHz
CDMA800: 850-894 MHz ( Not used by Russian mobile operators since 2010)
PHS: 1900-1930 MHz (Legacy, formerly used in China and Japan)
Such jammers are often combined in one device with cellular jammers. They are designed to block the data transmission channels of wireless cameras. This provides additional protection against information leaks.
If such a jammer is active in the room, then in addition to covert surveillance cameras, routers, wireless keyboards and mice do not work.
Frequency range:
Wi-Fi/Bluetooth: 2400 - 2500 MHz
Service vehicles of truckers and couriers are equipped with GPS beacons that allow the employer to control the location of the employee. But you can protect yourself from such surveillance with the help of an anti-tracker.
A GPS anti-tracker is a small device that is installed in the car's cigarette lighter and blocks the signals of GPS and GLONASS satellites. Some anti-trackers also include a GSM jammer.
GPS and Glonass jammers are also used by car thieves to protect against surveillance of a stolen car.
Frequency bands:
GPS L1: 1570-1620 MHz
GPS and GLONASS L2: 1200-1310MHz
GPS and GLONASS L3: 1380-1410MHz
In online stores they are sold under the vital name "Antishanson". Such jammers will be useful in minibuses, taxis, shops and other habitats of Radio Dacha and Retro FM listeners.
Frequency range:
FM: 88-108MHz
Also, MP3 players with FM transmitters are used to counter chanson and trolling drivers. With their help, you can not only turn off the radio, but make the entire minibus listen to your favorite tracks.
Microphone jammers are included in the comprehensive eavesdropping protection kit along with cellular and Wi-Fi/Bluetooth jammers. There are two ways to prevent audio recording:
ultrasonic suppression. The device generates ultrasound that is not perceived by human hearing, but creates interference that blocks recording from smartphones and pocket recorders.
acoustic suppression. The device generates an audible "chorus of voices" interference.
A "mic jammer" usually weighs several kilograms, looks like a regular speaker and looks organic in the interior. It is controlled by a remote control that can be hidden in a pocket.
For suppression of radio signals imperceptible to others, jammers camouflaged under various objects are sold in online stores. Portable jammers with a range of up to 15 meters are disguised as purses or packs of cigarettes, and more powerful universal jammers as briefcases, diplomats or interior details.
Today, communicating with each other has become much easier thanks to the advent and ubiquity of mobile phones. But, on the other hand, such development entails many unpleasant moments. And in order to avoid all sorts of surprises, they came up with special devices that have now become available not only to intelligence officers, but also to ordinary people. These are the so-called suppressors or jammers. With their help, you can not be afraid of hidden cameras, wiretapping, "bugs" and similar "tricks" that are available today to everyone.
Suppressors can be purchased, for example, via the Internet. And radio amateurs make them themselves. How these devices work, what they are capable of and how to make a GSM jammer with your own hands, we will talk in the next article.
Some of them are devices of such a type that when devices fall into their coverage area, all phones around catch only interference, and people cannot talk on them.
Other GSM jammers aim to scan frequencies and look for a specific signal. The moment he appears, they begin to generate interference. Thus, electrical energy is significantly saved.
Devices may have different ranges. Some of them do not extend more than ten meters. They are perfect for a small office or car.
More serious models have a range of about fifty meters. They can be used, for example, in conference rooms or meeting rooms.
But there is also a device with a huge radius of action. It can spread interference over entire areas. Of course, only special services have access to such a GSM jammer.
The diagram below will help you design the device yourself.
Nevertheless, it must be borne in mind that, according to the Russian federal law "On Communications", all communication blockers are subject to mandatory registration and certification. The certificate is issued by the device manufacturers themselves upon purchase, but the device owners are responsible for the registration procedure. If it is not passed, then the operation of the device is an illegal act, for which you will have to bear responsibility.
But thanks to such devices, you can protect yourself from various peeping devices that have the goal of invading your privacy. It is sometimes unrealistic to detect them due to their miniature size, but GSM jammers may well cope with the task.
Installation of the device is quite simple. The antenna is screwed into the connector, and the jammer will suppress the signals within ten seconds after being turned on. The blocker is able to work both in and through the network. Also, if necessary, you can use the car cigarette lighter.
But we should not forget that the illegal use of the device is a violation of the law.
It happens that after the GSM jammers are charged, turning on the devices, they detect poor performance, the spread of action only to a certain telecom operator, or something else like that. This happens if operators use slightly different frequencies.
But in order for the device to work with them, you must perform the following steps:
Similar actions are taken to configure on WiFi.
Probably everyone knows today what "bugs" are. Various means of wiretapping are currently used not only by special services. They can be installed by a student and even a schoolboy.
However, jealousy, business competitors and others are most often interested in such devices. Spy technology can harm anyone. Therefore, many people are interested in information security today. And the GSM jammer is exactly the device that fights such phenomena.
Well, many people have long known about GSM 900-1800 cell phones that without a jammer they easily turn into a means of information leakage.
Such a device is usually imperceptible and operates on certain frequencies. At the same time, on a cell phone, when the device is operating, something like “network not found”, “no signal”, and so on, is usually displayed. And if it is installed with some kind of device, then after a few seconds it is interrupted. Then no spyware will be able to eavesdrop and catch signals.
Jammers of GSM phones or Wi-Fi do not emit powerful noise, radio signal. Therefore, household devices both worked and continue to work.
Highly sensitive spy equipment can be installed anywhere: in offices, cars, apartments, saunas, and so on. Communication occurs at certain frequencies. Ordinary detectors often fail to cope with the task and are not able to "calculate" modern spy equipment. But jammers, designed to meet the increased conditions and requirements, can “neutralize” the space.
In recent years, another type of spy equipment has become widespread - GPS trackers. They are designed not only to control cargo transportation, as manufacturers often say. They are often used by law enforcement agencies, and private detectives, and the same envious competitors, up to criminal structures.
These are completely miniature devices, which are easy and simple to hide. And as a result, a certain person will be under such automated surveillance. That is why the GSM signal jammer, a kind of anti-tracker, began to be developed.
These are such specific modules that do not allow you to calculate the coordinates of a person or vehicle. The one who follows using the tracker will see only “no data”, or the data will not come to him at all.
Jammers ensure vehicle anonymity and prevent the collection of personal information via GPS channels.
The devices are able to successfully deal with all kinds of spyware that can harm any person in his personal life and in the business sphere, as well as the whole organization. Therefore, in our realities, such things cannot be neglected, and it is necessary to try to protect yourself, your loved ones and employees from spy gadgets.
In you can find instructions for self-assembly of devices.
One of them is shown below.
The suppressor is capable of resisting a signal at a frequency of 800 megahertz - most mobile devices are tuned to it. The control generator here is the oscillating wave generator. The device works perfectly, but certain skills are certainly required to assemble it.
Signals are taken at forty-five megahertz. The local oscillator port responds to it. The result is interference. The resistance in both the local oscillator port and the oscillator is equalized by sending a signal from the receiver's oscillator.
At the port of the last generator, the antenna is tuned to 800 megahertz. The RF output is connected to an amplifier, increasing the power of the device to sixteen dBm. After that, the increased signal hits the antenna.
Do-it-yourself GSM jammer inside is made from:
Jammers operate at different frequencies depending on the need to interfere with certain communication devices.
The VCO can be considered the "heart" of the whole device. It produces an RF signal. An RF amplification unit will be needed to expand the coverage of the device. The tuning circuit is with feedback and open. Sold in a variety of capacities. But it should be understood that with more power, the operating time will decrease. signals generated by the suppressor. The power supply keeps the instrument alive. It can be used as a lithium ion battery. But if you will use a conventional power source, then be sure to purchase an AC adapter.
These are the means by which today we have to deal with side effects of those inventions that may have been intended for completely different, good and useful purposes.
