How to set up a cell jammer. GPS beacons and jammers: revealing secrets

Mobile Suppressor Scorpion 5XL

Scope of the blocker

There are many ways to wirelessly transmit information today. Radio wave and satellite networks are ubiquitous and there are often times when you need to ban them in a specific location. This could be a theater, a defense establishment, a laboratory, a school or an institute during an exam, etc. In addition, modern means of spy eavesdropping and surveillance (cameras, bugs, transmitters), of course, use wireless channels for communication, such as:

• Wi-Fi:
• CDMA;

In this regard, there may be a need to jam all possible radio wave and satellite signals, and not just one or two types. For this purpose, it will be useful to purchase a professional frequency blocker covering the entire frequency range from 130 to 2600 MHz. Such a device completely suppresses any transmission of information over a wireless network within its range and provides reliable protection.

The broadband frequency jammer covers the entire range of wireless networks, thereby providing comprehensive protection in the controlled area. It can have a rather large range in comparison with narrowly targeted, pocket and, even more so, homemade frequency suppressors.

The price depends on the functionality and the presented characteristics, including:

• number of suppression frequencies (up to 16 and more);
• the radius of the jammer;
• the number and size of antennas, the possibility of their replacement;
• the ability to adjust the suppression power;
• used cooling system;
• noise characteristics;
• the ability to block satellite communication channels (GLONAS, GPRS);
• power and energy consumption characteristics;
• the presence of various indicators and indicators of the activity of the detected signals;
• dimensions, weight and equipment.

A complex radio frequency blocker is usually a stationary device that operates from the mains through a special adapter. A reliable cooling system (fans) is often present. Thanks to this, the muffler can work in a constant mode for an unlimited time. The presence of interfaces for connecting noise amplifiers is possible in order to further expand the range, although with professional suppressors it can already reach 200 meters.

Every day we are surrounded by more and more technology that works with the use of wireless networks: mobile phones, gadgets for "smart" homes, car alarms, unmanned aerial vehicles.

Unfortunately, such devices are easily damaged. A simple device for a few thousand rubles can neutralize burglar alarms or disable 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 find out what kind of household radio frequency suppressors are and for what purposes they are used.

A warning

Jammers can be easily bought on the Internet, but they should only be used with the permission of Roskomnadzor. More details on the registration process of radio frequency suppressors can be found in the document Registration of RES and VChU.

Responsibility for violation of the rules for registration of RES and VChU is spelled out in Article 13.4. Administrative Code of the Russian Federation. Violation of the rules for the design, construction, installation, registration or operation of radio electronic means and (or) high-frequency devices. Individuals are threatened fine up to 500 rubles and confiscation of the device.

How do RF jammers work?

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 jammed. A "white noise" field is created around the jammer, in which signals from other sources are lost.

Types of jammers by form factor

Stationary jammers. These devices are designed to be used permanently in one location and require a network connection to function. They weigh several kilograms and can simultaneously generate "white noise" on ten or more radio frequency bands.

Portable jammers. These devices can be carried in a 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 ranges.

Covers-blockers. Since the 90s, many legends have been circulating about the "police mode" built into every GSM phone, which allows the cellular operator to track the movements and listen to the conversations of any subscriber.

Typically, these cases have two compartments. The first compartment is designed to completely block signals, and the second to protect against harmful radiation.

In many countries around the world, high-ranking officials and intelligence officers use specially assembled mobile phones. In Russia, for employees of secret departments are issued crypto phones SMP-ATLAS / 2 and M-549M.

And now let's take a closer look at what the suppression of signals at different frequency ranges is used for in practice.

cellular

In most cases, cellular jammers are purchased to protect premises from eavesdropping using GSM bugs. The jammer can create silence in the hall at a mass event by blocking incoming calls.

Perhaps, soon in our country, a law will be adopted, according to which jammers of cellular communications will be installed in prisons, in schools during the exam, in university auditoriums, theaters and other public places.

Frequency ranges:
GSM900: 925-960 MHz
GSM1800: 1805-1880 MHz
3G: 2110-2170 MHz
4G WIMAX: 2570-2690 MHz
4G LTE: 791-820 MHz
CDMA800: 850-894 MHz ( not used by Russian mobile operators since 2010)
PHS: 1900-1930 MHz (legacy standard, previously used in China and Japan)

Wi-Fi / Bluetooth

Such jammers are often combined in one device with cell jammers. They are designed to block 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

GPS / Glonass

Truckers 'and couriers' service vehicles are equipped with GPS beacons that allow the employer to monitor the location of the employee. But you can protect yourself from such surveillance using an anti-tracker.

GPS anti-tracker is a small device that is installed in the car's cigarette lighter and blocks signals from GPS and GLONASS satellites. Some anti-trackers also include a GSM jammer.

GPS jammers and Glonass are also used by hijackers to protect against tracking a stolen vehicle.

Frequency ranges:
GPS L1: 1570-1620 MHz
GPS and GLONASS L2: 1200-1310MHz
GPS and GLONASS L3: 1380-1410MHz

Radio

In online stores they are sold under the life name "Antishanson". Such jammers will come in handy in minibuses, taxis, shops and other places where the listeners of Radio Dacha and Retro FM live.

Frequency range:

FM: 88-108MHz

Also, MP3 players with FM transmitters are used to counteract chanson and trolling of drivers. With their help, you can not just drown out the radio, but make the entire minibus listen to your favorite tracks.

Audio recording

Microphone jammers are included in the comprehensive anti-eavesdropping kit along with cell jammers and Wi-Fi / Bluetooth jammers. There are two ways to prevent audio recording:

Ultrasonic suppression. The devices generate ultrasound, which is not perceived by human hearing, but creates interference that blocks recording from smartphones and pocket recorders.

Acoustic suppression. The device generates human-audible “chorus of voices” interference.

"Microphone jammer" usually weighs several kilograms, looks like an ordinary speaker and looks organically in the interior. It is controlled using a remote control that can be hidden in your pocket.

How do jammers mask?

For the imperceptible suppression of radio signals to others, jammers are sold in online stores, camouflaged for various objects. Portable jammers with a range of up to 15 meters disguise themselves as purses or packs of cigarettes, and more powerful universal jammers for 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 video cameras, wiretapping, "bugs" and similar "tricks" that are available to everyone today.

Suppressors can be purchased online, for example. 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.

How do suppressors work on phones?

Some of them are devices of such a type that when the devices fall into their range of action, all the phones around them catch only interference, and people cannot talk on them.

Other GSM jammers are aimed at scanning frequencies and looking for a specific signal. The moment he appears, they start generating interference. Thus, electrical energy is significantly saved.

Devices can have different ranges. Some of them do not spread 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 range. It can spread noise 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.

Suppressors and the law

Nevertheless, it should 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 illegal action, for which you will have to be responsible.

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.

Suppressor installation and operation

The installation of the device is quite simple. The antenna is screwed into the connector, and the jammer will suppress signals within ten seconds after turning on. The blocker is able to work both in and through the network. Also, if necessary, you can use the car's cigarette lighter.

But do not forget that illegal use of the device is a violation of the law.

Fine tuning

It happens that after the GSM jammers are charged, turning on the devices, they find weak work, the spread of the 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, it is necessary to perform the following actions:

• remove the switch;
• unscrew the antenna;
• remove the cover;
• pull out the microcircuit;
• turn the trimmer resistor on it with a screwdriver to increase or decrease the frequency.

Who needs to invade someone else's life

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 the special services. They can be installed by a student and even a schoolchild.

However, most often jealous people, business competitors and others are interested in such devices. Spyware can harm anyone. Therefore, many people are interested in information security today. And the GSM jammer-jammer acts as exactly the device that fights against such phenomena.

Well, many people have long known about GSM 900-1800 cell phones that without a jammer they can easily turn into a means of information leakage.

Jammer Bluetooth, 3G, Wi-Fi

Such a device is usually invisible and operates at certain frequencies. At the same time, something like "network not found", "no signal" and so on is usually displayed on the cell phone when the device is operating. 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 for GSM phones or Wi-Fi do not emit powerful noise or radio signals. Therefore, household appliances have worked and continue to work.

Highly sensitive spy equipment can be installed anywhere: in offices, cars, apartments, saunas, and so on. Communication takes place at specific frequencies. Conventional detectors often fail to cope with the task and are unable to "calculate" modern spy technology. But jammers, developed taking into account the increased conditions and requirements, can "neutralize" the space.

GPS jammer and anti-tracker

In recent years, another type of spyware has become widespread - GPS trackers. They are designed not only to control cargo transportation, as manufacturers often claim. They are often used by law enforcement agencies, private detectives, and the same envious competitors, up to criminal structures.

These are completely miniature devices, which are easy and simple to hide. As a result, a certain person will be under such automated surveillance. That is why a GSM signal jammer, a kind of anti-tracker, began to be developed.

These are certain modules that do not allow calculating the coordinates of a person or vehicle. Anyone who monitors using the tracker will see only "no data", or the data will not be received at all.

The vehicle's suppressors ensure anonymity and do not allow the collection of personal information via GPS channels.

The devices are capable of successfully combating all kinds of spyware that can harm any person, both in 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.

Diy GSM signal jammer

In you can find instructions for self-assembly of devices.

One of them is given below.

The jammer is able to withstand a signal at 800 megahertz - most mobile devices are tuned to this frequency. The oscillating wave generator acts here as a control generator. The device works great, but it certainly takes some skill to assemble it.

Signals are taken at forty-five megahertz. The local oscillator port responds to it. The result is interference. The resistance of both the local oscillator port and the oscillator is equal by directing the 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 fixture to sixteen dBm. After that, the increased signal is sent to the antenna.

A do-it-yourself GSM jammer inside is made of:

• tuning scheme;
• antennas;
• amplifier stage;
• source of interference.

Jammers operate at different frequencies, depending on the need to interfere with certain communication devices.

The GUN can be considered the "heart" of the whole device. It produces an RF signal. An RF amplifier will be needed to extend the range of the device. The tuning circuit is available with feedback and open loop. are 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 device alive. A lithium ion battery can be used as it. But if you will be using a conventional power supply, be sure to purchase an AC adapter.

These are the means today to deal with the side effects of those inventions, which, perhaps, were intended for completely different, good and useful purposes.

Relatively recently, devices have appeared on the market of electronic navigation systems that have received the general name "GPS jammer" (suppressor or "GPS anti-tracker"). The task of these portable devices, in general, is a noble one - protection against any attempts to determine your location using

What is a GPS signal jammer?

"Jammer" GPS-signal is designed to suppress the signal of the global satellite navigation system GPS in the range of 1500-1600 MHz.

The GPS jammer makes it impossible for satellite monitoring of vehicles by means of GPS navigators, as well as GPS bugs and GPS trackers, while the jammer does not interfere with the operation of cell phones and other devices. In practice, the navigation suppression radius is from 5 to 10 meters, which is quite enough for a car, truck and bus, since the tracker is usually installed in the car's cabin.

When the "jammer" is connected through the car's cigarette lighter, it immediately starts its work and generates "radio noise" (interference) in the 1500-1600 MHz (L1 / L2) ranges within a radius of up to 15 meters. These are the main ranges that all GPS devices operate on, including the tracking trackers that employers usually use to track drivers. When you turn on the navigation jammer, all devices that determine your location using GPS cease to receive a signal from the satellite and you “disappear” from the tracking programs screen.

GPS jammers ("jammers") really help protect against any attempts to track you using the signals from the GPS tracker that is installed in your car.

Positioning using satellite navigation systems

The desire to know their location and the location of other mobile objects, regardless of the weather, time of day, of course, occurred to the military. Controlling the actions of your army, having accurate data on the position of your units of equipment and infantry, can be much more effective than if these data are approximate or completely inaccurate.

To do this, the United States created the GPS (Global Positioning System) system, which was initially available only to the military, but then one of the artificially low accuracy ranges was made civilian. L1 band with a frequency of 1575.42 MHz.

Later, the GLONASS system appeared. It took into account some of the shortcomings of GPS and is now more effective. L1 civil band 1602 MHz.

The principle of operation of any satellite navigation in a nutshell can be described as follows:

Satellites are constantly flying in the sky, their number is such that at any time from the ground at least 4 satellites can be observed. It is this amount that is needed to obtain coordinates. Satellites synchronously (that is, at the same time) transmit data packets to the ground. The simultaneous start of transmissions of such packets is very important, therefore ultra-precise atomic clocks are installed on the satellites.

The receiver on the ground, and it can be a cell phone, navigator or GPS Marker, receives these packets. But since the distance to each transmitting satellite is different, these signals do not come simultaneously, but with a small time difference.

In each packet of data, the satellite transmits its exact coordinates, and also in each packet contains part of the data on the coordinates of other satellites. Their transmission speed is very low, so data on other satellites is transmitted in only a few minutes. When there is enough data, i.e. the coordinates of at least 3-4 satellites are known, the receiver can finally determine its position using the received coordinates of the satellites, as well as the difference in the time of receiving the packets.

For example, satellite # 1 is 2 times farther from us than satellite # 2. This means that the signal from satellite # 1 will take 2 times longer than from satellite # 2. And if there are three satellites, then we find out the coordinate in which the object is located, i.e. latitude and longitude, but this data will be incomplete because these coordinates do not contain heights. And only the data obtained from four satellites at once will give us the exact coordinates in space, i.e. not only latitude and longitude, but also altitude.

So: navigation satellites fly around the earth in orbits and synchronously send data packets to the earth. The receiver receives data and calculates its coordinates, estimating the difference in the time of receiving packets and having data on the coordinates of the satellites at a given time.

Differences between GLONASS and GPS

The systems appeared at different times. First, GPS appeared, and only then came the response from the USSR in the form of GLONASS. However, the system has become fully operational only in recent years. The systems are almost identical. The differences lie in the carrier frequency: for GPS it is 1575.42 MHz, while for GLONASS it is 1602 MHz. In addition, the speed of transmission of auxiliary packets, and hence the speed of determining the coordinates, differs - in GLONASS it is slightly higher.

As a rule, all navigation receivers use data from both systems in their calculations. First, it allows you to effectively find coordinates in a densely built environment, when houses are obstructed by satellites, and the number of "visible" satellites is sharply reduced. Secondly, the use of two systems simultaneously increases the accuracy of determining coordinates, since the number of satellites used in the calculations is greater, which means that there are more initial data for calculations. The excess of data allows you to get rid of the influence of harmful signal distortions (reflections, weak signal levels, etc.). Thus, it is possible to calculate the coordinates more accurately, ignoring dubious data from some satellite (exclude it from the calculations, replacing its data with more reliable data from other satellites).

What is a jammer?

"Jammer" is a common name for a device that interferes with the normal transmission of a radio signal. Principle of operation: generation of noise (radio interference) at the transmission frequency of the useful signal. The more powerful the noise amplitude (the power of the noise generator), the less likely it is to communicate at the frequency of noise generation and the greater the radius of influence of radio interference (the radius of the "jammer").

There are 3 types of jammers:

1) "Jammer" GPS, which "jammers" signals from satellites (more precisely, it generates noise at the frequency of data transmission from the satellite).

Signals from satellites (and not vice versa, as many believe) are transmitted to devices on the ground (or in the air) on two main frequencies:

• GPS frequency (civil L1 band, which is used in trackers) - 1575.42 MHz.
• GLONASS frequency (civilian L1 band, which is used in trackers): 1602 MHz.

Since the frequencies are very close, they are "jammed" with a broadband noise generator that only needs one antenna.

2) GSM "jammer", which makes noise at the frequencies of cellular operators. Operators operate on different frequencies depending on the mode (Edge, 3G, 4G) and depending on the standard (GSM, DAMPS, CDMA). Thus, in order to close all ranges, several antennas are installed on the "jammer", each of which "works" for its own range.

3) Universal "jammer". "Works" on all ranges of both cellular operators and satellite signals. Has multiple antennas to generate interference on selected bands. Selective operation is often provided, i.e. the ability to generate noise only on selected frequencies (for example, only the GSM 1800 cellular standard range).

Protection against GSM jammers

The most burning topic is jamming protection. So, there is a cell phone and there is a cellular signal jammer. Let's remember what a "jammer" is: it is a noise generator (radio interference) at the transmission frequency of the useful signal. Is it possible to directly counteract jamming in some way? The answer is NO! Why not? Because you cannot see the stars in the sky while the sun is there. The sun is shining too brightly, and the stars are too dim compared to the sun. The same principle applies to the radio signal: the "jammer" makes too much noise compared to the signal level of the cell phone.

However, a cell phone, or rather its radio modem (and any phone has a radio modem that actually communicates) has one important feature. The farther the cell phone is from the base station (that is, from the cell tower), the weaker the signal from it and the more powerful the transmitter is needed to ensure reliable signal transmission from the cell phone to the tower and from the tower to the cell phone. The telephone (or rather a radio modem) “knows how” to increase the signal power if the base station is far away and, conversely, to decrease the signal power if the base station is nearby.

What happens when a powerful source of noise appears near the phone (radio modem)? It's very simple: the phone thinks that the tower is far away and begins to increase the transmitted signal power to its maximum, in order to finally "reach" the tower and receive an answer from it. And this maximum transmission power is often enough to ensure communication with the nearest base station even in the conditions of the "jammer" operation. The likelihood of such a "jammed" registration in the cellular network is very high in urban conditions, and especially if the noise source ("jammer") is located behind the cell phone (radio modem with an antenna) relative to the tower.

Here we remember that the GPS Marker, like a cell phone with a built-in GSM radio modem, can be hidden in the most unexpected place, even in the taillight. And the "jammer" will be ineffective if the car moves around the city: somewhere, perhaps, the Marker will be registered in the network, and one packet will be enough to determine the coordinates.

In addition, no jammer will last forever. While the GPS Marker can work autonomously on one set of batteries for up to three years. It is unlikely that someone will keep a car in a "sump" for three years (a garage for temporary storage of stolen vehicles, where attackers bring their cars after theft). As soon as the GPS Marker is registered in the network, it will immediately transmit its coordinates to the owner.

Protection against GPS jammers and what is LBS?

GPS - "jammers" - devices that generate noise at the frequencies of satellite navigation systems. Their goal is to prevent the GPS / GLONASS receiver from receiving a signal from the satellite. And here the task for the "jammer" is not difficult at all, since the signal level from the satellite is extremely low, because it is enough to wrap the receiver in thick foil to deprive it of any opportunity to receive the already weak signals from the satellites.

However, there is still a fight against this method of jamming and is called LBS (Location-based service). This system assumes the determination of coordinates using the towers of the cellular operator. By analyzing the signal strength from each base station that the GPS Marker "sees" (it is, in fact, a cell phone), and knowing their coordinates, you can roughly estimate the coordinates. The accuracy of such a determination is low, but it allows you to find out the area, and sometimes the building in which the GPS Marker is located. In most cases, this is enough to determine the search area and almost always allows you to find the Marker and the stolen vehicle.

What's the bottom line?

Yes, it is impossible to completely neutralize the jammers. However, you can fight them.

The simplest protection is to install several beacons on the car. One is installed in a more or less accessible place, for example, GPS Marker M130 (even with external power supply and in tracker mode), and the second must be hidden very effectively, for example, GPS Marker M70.

The hijackers will quickly find the first one that works in the Tracker or frequent signal mode - for example, it gets in touch every hour or turns on when the car starts moving. But if you reliably hide the second GPS Marker, which wakes up every 1-7 days, the likelihood that it will be tracked and found is negligible!

We suggest you evaluate the radio frequency jammer. The circuit itself is pretty simple. Works guaranteed. Its task is to suppress signals from television and radio sources. Any of the television channels (satellite does not count) can be muffled by the device, the main thing is to ensure the required distance to the source, usually it does not exceed 15 meters. The transmitter of the jammer can actually be performed on a single transistor.

Any transistors will do:

Good examples are KT 368 and KT 325, which belong to the RF and Microwave series, respectively. Due to the use of microwave transistors at the radio frequency jammer, the range of operation will increase, by about 50 meters. The circuit should be made of a wire with a cross section of 0.5-0.7 mm, six turns are enough. The frame on which it is wound must be 4 mm in diameter. The circuit we are talking about now is partially borrowed, the original is a radio bug circuit. The original transmission circuitry has been replaced in order to interfere with the AM and FM bands - the most common ones compared to the rest.

What works as an antenna?

The role of the antenna, in this device, was taken by a piece of copper wire, the length of which does not exceed 20 cm. Its presence ensures the range of the jammer, if there is no such need, you can do without an antenna. The variable capacitor acts as a regulator, rotating it can interfere with the channels occupying the nearest ranges. To suppress a couple of channels, there is no difference between TV or radio, the jammer has enough power.

To maintain the jammer's performance, you need a battery, "corundum" or "crown" is enough. Voltage is required within 4-12 V.

You can also assemble the device by using microwave field-effect transistors. By including resistors in the circuit, you can increase or decrease the ratings of radio components. Capacitors are not suitable for this circuit, their presence is fraught with unstable operation of the device.

The device is consuming current. Consumption should not exceed 5-7 mA. The power of the signal muffler can be reduced by increasing the value of the emitter resistor to 100 ohms. This procedure will give the result, increasing the power by 2 watts. The power of the field-effect transistors allows you to drown out the GPS range, and, therefore, mobile communications.

Deputy Director for Development Kerimov Rostislav.

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