Recently, there have been more and more cases of information leakage as a result of overheard conversations, hacked email addresses, etc. This happens mainly with the use of special software and other special tools. In this regard, there is a high demand for tools designed to ensure the safety of information, including those that operate by suppressing frequencies.
Cellular radio frequencies are a field through which unauthorized access to information is often made. The use of devices to block such access involves creating interference in the wiretapping path. At the same time, such equipment is capable of blocking both cellular radio frequencies and GPS, GLONASS, and Wi-Fi signals.
The equipment used includes stationary devices, portable devices and additional special equipment.
Stationary blockers make it possible to block the operation of mobile phones and gadgets at a distance of up to several hundred meters. They are able to work non-stop for several hours. They are mainly installed where the use of cellular communications is prohibited or limited (closed enterprises, educational institutions, concert halls, etc.)
Portable devices can be battery operated or battery operated.
The coverage radius is lower compared to fixed devices. Thus, the stationary device Alligator-200 suppresses frequencies in a circle of 200 meters, while the mobile Scorpion 50SP Prof covers a radius of no more than fifty meters. The good thing is that they can be used anywhere. The battery allows uninterrupted operation for several hours. Many samples have adapters, thanks to which there is the option of working from a portable battery (or in the same car).
Additionally, the devices include scanning devices, which make it possible to locate devices intended for collecting information at a distance of up to several tens of meters. And some of them (for example, Raksa 120 Pro), in addition to finding the device, determine the power, as well as the frequency of its operation.
Today, devices that provide . Thanks to this, for example, it is possible to stop employees from endlessly surfing on social networks, thereby increasing the efficiency of their work.
Frequency suppression devices have functions for regulating and selecting frequencies in which it is supposed.
How do they work
The basis of operation comes down to generating frequencies that create interference on radio frequencies and on those frequencies at which high-speed Internet operates. Also noteworthy is the ability to prevent the recording and transmission of information that was obtained illegally.
And finally
As a result of merciless competition, many today are not shy in their methods of struggle, including using unauthorized access to confidential information, thus violating the law. And law enforcement agencies are not always able to ensure the identification and punishment of the offender. In this regard, it is advisable to resolve information security issues independently.
Every day we are surrounded by more and more equipment that operates using wireless networks: mobile phones, smart home gadgets, car alarms, unmanned aerial vehicles.
Unfortunately, such devices are easy to damage. A simple device for several thousand rubles can neutralize a security alarm or turn off cellular communications in an entire office.
If you live in Moscow, you encounter this regularly in the city center.
In this article you will learn what types of household radio frequency suppressors there are and for what purposes they are used.
Warning
“Jammers” can be easily purchased on the Internet, but they should only be used with the permission of Roskomnadzor. More details about the process of registering radio frequency jammers can be read in the document Registration of RES and RF.
Responsibility for violation of the rules for registration of RES and VChU is specified 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.
How do RF jammers work?
The general operating principle 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. Such devices are designed for constant use 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 ranges.
Blocking cases. Since the 90s, there have been many legends about the “police mode” built into every GSM phone, which allows the cellular operator to monitor 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, employees of secret agencies are issued crypto phones SMP-ATLAS/2 and M-549M.
Now let’s take a closer look at why signal suppression is used in practice at different frequency ranges.
cellular
In most cases, cellular jammers are purchased to protect premises from wiretapping using GSM bugs. A mobile phone jammer can create silence in the hall at a public event by blocking incoming calls.
Perhaps our country will soon pass a law according to which cellular jammers will be installed in prisons, schools during the Unified State 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, formerly used in China and Japan)
Wi-Fi/Bluetooth
Such jammers are often combined in one device with cellular 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 hidden surveillance cameras, routers, wireless keyboards and mice do not work.
Frequency range:
Wi-Fi/Bluetooth: 2400 – 2500 MHz
GPS/Glonass
Company cars of truck drivers and couriers are sometimes equipped with GPS trackers, which allow the employer to monitor the location of the employee. But you can protect yourself from such surveillance using an anti-tracker.
A GPS anti-tracker is a small device that is installed in a car's cigarette lighter and blocks signals from GPS and GLONASS satellites. Some anti-trackers also include a GSM jammer.
GPS jammers and Glonass jammers are also used by car thieves to protect against surveillance of a stolen car.
Frequency ranges:
GPS L1: 1570-1620 MHz
GPS and GLONASS L2: 1200-1310 MHz
GPS and GLONASS L3: 1380-1410 MHz
Radio
In online stores they are sold under the life-like 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
MP3 players with FM transmitters are also used to counter chanson and troll drivers. With their help, you can not just turn off the radio, but force the entire minibus to listen to your favorite tracks.
Audio recording
Microphone jammers are included in a comprehensive anti-wiretapping protection kit along with cellular and Wi-Fi/Bluetooth jammers. There are two ways to prevent audio recording:
Ultrasonic suppression. The device generates ultrasound, which is not perceived by human hearing, but creates interference that blocks recording from smartphones and pocket voice recorders.
Acoustic suppression. The device generates a “choir of voices” interference that is audible to humans.
A “microphone jammer” usually weighs several kilograms, looks like an ordinary speaker and looks natural in the interior. It is controlled using a remote control that can be hidden in your pocket.
How are jammers camouflaged?
To suppress radio signals unnoticed by others, online stores sell jammers camouflaged as various objects. Portable jammers with a range of up to 15 meters are disguised as purses or packs of cigarettes, and more powerful universal jammers are disguised as briefcases, diplomats or interior parts.
We present to your attention a new mobile and radio frequency suppressor MGDU-40. This device combines the widest range of operating frequencies. The jammer will allow you to protect yourself from telephone wiretapping as well as from the unwanted use of car alarms, control panels and other devices operating at the frequencies indicated below. It can jam almost all mobile and radio signals.
This stationary blocker is capable of causing interference within a radius of 40 -70 meters. It all depends on the strength of the signal in a certain location. It has 8 antennas installed on it, made of high-tech rubber, that is, you can suppress 8 frequency ranges at once. You just need to install the device in the right place, connect the numbered antennas and turn on the power. By the way, the kit includes a standard 220V charger as well as charging from a car cigarette lighter. It is also important to be able to independently adjust the strength of interference for each frequency. Using special controls, you can increase the strength of “white noise” for a certain range or, on the contrary, reduce/turn it off.
It is possible to set frequencies:
GSM - 850-894 MHz
GSM - 925-960 MHz
DCS - 1805-1880 MHz
3G - 2110-2170 MHz
4G - 2620-2690 MHz
GPS - L1, L2, L5
VHF - 135-174 MHz
UHF - 400-470 MHz
The main function of this jammer is the ability to turn off radio frequencies. However, there are times when a universal device is needed, capable of handling others in addition to the above frequencies. It is not the best option to buy a separate device for each range. It is in such cases that MGDU-40 will be an excellent solution. By purchasing such a jammer, you solve several problems at once.
The weight of the device is 4 kilograms. The best place for installation is on an elevated surface. The optimal height is considered to be about 2 meters. In this position, the device will produce the greatest results.
Peculiarities:
Powerful blocker of 8 frequency bands
Range of action - 40-70 meters
Ability to adjust the strength of outgoing interference
Antennas are marked for easy installation
Powerful radiator for cooling
General power: 20 W
Specifications:
Weight - 4 kg
Dimensions - 370x140x51 mm
Number of antennas - 8
Black color
Power supply - 50/60Hz, AC 100~240V DC 12V
The kit includes the device, eight removable antennas, charging from the network, charging from a car cigarette lighter. Now you will solve the problem with unwanted signals and wiretapping. All products come with a one-year warranty from our store www.site
The blocking radius declared by the manufacturer may in fact be smaller. It all depends on the signal strength and where the jammer is used! The device operates with the specified radius with a cellular signal strength of 95 dBm
Relatively recently, devices have appeared on the market of electronic navigation systems that have received the general name “GPS jammer” (jammer or “GPS anti-tracker”). The task of these portable devices is, in general, noble - protection from any attempts to determine your location using
What is a GPS signal jammer?
The GPS signal jammer is designed to suppress the signal of the GPS global satellite navigation system in the range of 1500-1600 MHz.
A GPS jammer makes satellite monitoring of cars impossible using 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. The navigation suppression radius in practice ranges from 5 to 10 meters, which is quite enough for a car, truck and bus, since the tracker is usually installed in the car cabin.
When the “jammer” is connected through the car’s cigarette lighter, it immediately begins its work and generates “radio noise” (interference) in the 1500-1600 MHz range (L1/L2) within a radius of up to 15 meters. These are the main bands on which all GPS devices operate, including the tracking trackers that employers commonly use to monitor drivers. When you turn on the navigation jammer, all devices that determine your location using GPS stop receiving a signal from the satellite and you “disappear” from the tracking programs screen.
GPS signal jammers really help protect against any attempts to track you using the signals from the GPS tracker installed in your car.
Positioning using satellite navigation systems
The desire to know one’s location and the location of other moving objects, regardless of the weather or time of day, naturally occurred to the military. You can control the actions of your army, having accurate data on the position of your units of equipment and infantry, much more effectively than if this data is approximate or completely inaccurate.
For this purpose, the GPS (Global Positioning System) system was created in the USA, which was initially available only to the military, but then one of the artificially low accuracy ranges was made available to civilians. 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 currently more effective. Civil band L1 with a frequency of 1602 MHz.
The operating principle of any satellite navigation can be described in a nutshell as follows:
Satellites are constantly flying in the sky, their number is such that at any given time at least 4 satellites can be observed from the ground. This is exactly the amount needed to obtain coordinates. Satellites synchronously (that is, at the same time) transmit data packets to the ground. The simultaneity of the start of transmissions of such packets is very important, which is why ultra-precise atomic clocks are installed on the satellites.
A receiver on the ground, which 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 arrive simultaneously, but with a slight time difference.
In each data packet, the satellite transmits its exact coordinates, and each packet also contains part of the data about the coordinates of other satellites. Their transmission speed is very low, so data about other satellites is transmitted only in 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 location using the received satellite coordinates, as well as the time difference in receiving the packets.
For example, satellite No. 1 is 2 times farther from us than satellite No. 2. This means that the signal from satellite No. 1 will take 2 times longer than from satellite No. 2. And if there are three satellites, then we will know 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 altitude. And only data received from four satellites at once will give us 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 ground. 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 only become fully operational in recent years. The systems are almost identical. The differences lie in the carrier frequency: for GPS it is 1575.42 MHz, and for GLONASS it is 1602 MHz. In addition, the transmission speed of auxiliary packets differs, and therefore the speed of determining coordinates - GLONASS is slightly higher.
As a rule, all navigation receivers use data from both systems in their calculations. Firstly, this allows you to effectively find coordinates in densely built conditions, when houses are blocked by satellites, and the number of “visible” satellites is sharply reduced. Secondly, the use of two systems simultaneously increases the accuracy of determining coordinates, because the number of satellites used in calculations is larger, which means there is more initial data for calculations. Excess data allows you to get rid of the influence of harmful signal distortions (reflections, weak signal level, etc.). Thus, it is possible to calculate 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. Operating principle: generation of noise (radio interference) at the frequency of transmission of the useful signal. The more powerful the noise amplitude (power of the noise generator), the less likely it is to communicate at the frequency of noise generation and the larger the radius of influence of radio interference (radius of the “jammer”).
There are 3 types of “jammers”:
1) GPS “jammer”, which “jammes” 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 located on the ground (or in the air) at two main frequencies:
- GPS frequency (civil band L1, which is used in trackers) is 1575.42 MHz.
- GLONASS frequency (civil band L1, which is used in trackers): 1602 MHz.
Because the frequencies are so close, they are "jammed" using a broadband noise generator that requires only 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 cover all ranges, several antennas are installed on the “jammer”, each of which “works” on its own range.
3) Universal “jammer”. “Works” on all bands of both cellular operators and satellite signals. It has several antennas to generate interference on selected bands. Often provision is made for selective work, i.e. the ability to generate noise only at selected frequencies (for example, only the GSM 1800 cellular standard range).
Protection against GSM jammers
The most pressing topic is protection against jamming. So, there is a cell phone and there is a “jammer” of the cellular signal. Let us remember what a “jammer” is: it is a noise generator (radio interference) at the frequency of transmission of the useful signal. Is there any way to directly counteract jamming? Answer: NO! Why not? Because you cannot see the stars in the sky while the sun is there. The sun shines too brightly, and the stars shine too dimly compared to the sun. The same principle applies to a radio signal: the “jammer” makes too much noise compared to the signal level of a cell phone.
However, a cell phone, or rather its radio modem (and any phone has a radio modem, which actually communicates) has one important feature. The further a 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 transmission of the signal from the cell phone to the tower and from the tower to the cell phone. The phone (or rather the radio modem) “can” increase the signal strength if the base station is far away and, conversely, reduce the signal strength if the base station is nearby.
What happens when a powerful noise source appears next to the telephone (radio modem)? It’s very simple: the phone believes that the tower is far away and begins to increase the power of the transmitted signal to its maximum in order to finally “reach” the tower and receive a response from it. And this maximum transmission power is often enough to ensure communication with the nearest base station even under jamming conditions. The likelihood of such “jammed” registration in a cellular network is very high in a city, and especially if the noise source (“jammer”) is located behind the cell phone (radio modem with antenna) relative to the tower.
Here we remember that a GPS Marker, like a cell phone with a built-in GSM radio modem, can be hidden in the most unexpected place, even in a taillight. And the “jammer” will be ineffective if the car moves around the city: somewhere, perhaps, the Marker will be registered on the network, and one packet will be enough to determine the coordinates.
In addition, no “jammer” will work forever. While the GPS Marker can work autonomously on one set of batteries for up to three years. It is unlikely that anyone will keep a car in a “settlement area” (a garage for the temporary storage of stolen vehicles, where criminals bring their cars after the theft) for three years. As soon as the GPS Marker registers on the network, it will immediately transmit its coordinates to the owner.
Protection against GPS jammers and what is LBS?
GPS jammers are 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 at all difficult, because 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 ability to receive already weak signals from satellites.
However, there is still a fight against this method of jamming and it is called LBS (Location-based service). This system involves determining coordinates using cell phone towers. By analyzing the signal level from each base station that the GPS Marker “sees” (it is, in fact, a cell phone), and knowing their coordinates, you can approximately estimate the coordinates. The accuracy of this determination is not high, but it allows you to find out the area, and sometimes even 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 detect the Marker and the stolen car.
What's the result?
Yes, it is impossible to completely neutralize “jammers”. However, you can fight them.
The simplest protection is to install several beacons on a car. One is installed in a more or less accessible place, for example GPS Marker M130 (you can even use external power and in tracker mode), and the second needs to be hidden very effectively, for example GPS Marker M70.
Car thieves will quickly find the first one that works in Tracker or frequent signal mode - for example, it contacts every hour or turns on when the car starts moving. But if you reliably hide the second GPS Marker, which wakes up once every 1-7 days, the likelihood that it will be located and found is negligible!
Mobile jammer Scorpio 5XL
Area of application of the blocker
Today there are many ways to wirelessly transmit information. Radio wave and satellite networks are ubiquitous and there are often situations where they need to be banned in a particular location. This could be a theatre, defense establishment, laboratory, school or institute during an exam, etc. In addition, modern means of spy wiretapping and surveillance (cameras, bugs, transmitters), of course, use wireless channels for communication, such as:
- WiFi:
- 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 that covers the entire frequency range from 130 to 2600 MHz. Such a device completely jams any transmission of information via a wireless network within its range and provides reliable protection.
A broadband frequency jammer covers the entire range of wireless networks, thereby providing comprehensive protection in the controlled area. It can have a fairly large range of action compared to narrowly targeted, pocket-sized, and even more so, homemade frequency suppressors.
The price depends on the functionality and characteristics presented, including:
- number of suppression frequencies (up to 16 or more);
- jammer range;
- number and sizes of antennas, the possibility of replacing them;
- ability to adjust suppression power;
- the cooling system used;
- noise characteristics;
- ability to block satellite communication channels (GLONAS, GPRS);
- power and energy consumption characteristics;
- the presence of various indicators and indicators of the activity of detected signals;
- dimensions, weight and equipment.
A complex radio frequency blocker is usually a stationary device that operates from the mains via a special adapter. A reliable cooling system (fans) is often present. Thanks to this, the jammer can operate in constant mode for an unlimited time. There may be interfaces for connecting noise amplifiers to further expand the range, although for professional suppressors it can already reach 200 meters.
