Radio signal blocking. How to make your own jammers for cell phones and other radio transmitting devices with your own hands at home
Today, communicating with each other has become much easier, thanks to the emergence and widespread distribution of mobile phones. But, on the other hand, such a development entails many unpleasant moments. And in order to avoid all sorts of surprises, we came up with special devices, which have now become available not only to intelligence officers, but also ordinary people. These are so-called suppressors or jammers. With their help, you can not be afraid of hidden video cameras, wiretapping, “bugs” and similar “things” that are available to everyone today.
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 will be discussed in the next article.
How do cell phone jammers work?
Some of them are devices of such a type that when the devices fall within their range, all the phones around them only pick up 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 begin to generate interference. Thus, electrical energy is significantly saved.
Devices may 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 interference over entire areas. Of course, only special services have access to such a GSM jammer.
The diagram presented below will help you construct a device with your own hands.
Suppressors and the law
Nevertheless, it must be borne in mind that, according to Russian federal law“About communication”, 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 operating 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 spying devices that aim to invade your privacy. It is sometimes impossible to detect them due to their miniature size, but GSM jammers can cope with the task.
Suppressor Installation and Operation
Installation of the device is completely simple. The antenna is screwed into the connector, and the jammer will suppress the signals within ten seconds after switching on. The blocker is able to work both in and through the network. You can also use the car's cigarette lighter if necessary.
But we should not forget that illegal use device is a violation of the law.
Fine tuning
It happens that after the GSM jammers have been charged, turning on the devices, they discover weak operation, the effect extends only to specific operator communications or anything 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 trimming resistor on it with a screwdriver to increase or decrease the frequency.
Who needs to invade someone else's life?
Similar steps are taken to set up WiFi.
Probably everyone knows today what “bugs” are. Various means of wiretapping are currently used not only by intelligence services. They can be installed by a student or even a schoolchild.
However, most often jealous people, business competitors and others are interested in such devices. Spy technology can harm anyone. That's why information protection Many people are interested today. And the GSM jammer is precisely the device that combats such phenomena.
Well, many have long known about GSM 900-1800 cell phones that without a jammer they can easily turn into a means of information leakage.
Bluetooth, 3G, Wi-Fi jammer
Such a device is usually invisible and operates at certain frequencies. At the same time, on a cell phone, when the device is operating, something like “network not found”, “no signal”, etc. 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 pick up signals.
Jammers GSM phones or Wi-Fi do not emit powerful noise or radio signals. That's why household devices as they 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. Conventional detectors often fail to cope with the task and are not able to “compute” modern spy technology. But jammers, developed taking into account increased conditions and requirements, can “neutralize” space.
GPS jammer and anti-tracker
IN last years Another type of spy technology has become widespread - GPS trackers. They are not intended only for monitoring cargo transportation, as manufacturers often claim. They are often used by law enforcement agencies, private detectives, and the same envious competitors, even criminal structures.
These are absolutely miniature devices that are easy and simple to hide. And 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 one to calculate the coordinates of a person or vehicle. Anyone who monitors using a tracker will only see “no data”, or the data will not reach him at all.
Thanks to the suppressors vehicle Anonymity is ensured and personal information is not collected via GPS channels.
The devices are capable of successfully combating all kinds of spyware that can harm anyone both in their personal life and in business sphere, as well as the entire 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
You can find instructions for self-assembly devices.
One of them is given below.
The suppressor is capable of resisting a signal at a frequency of 800 megahertz - most mobile devices are tuned to this frequency. The control generator here is a rocking wave generator. The device works great, but its assembly certainly requires certain skills.
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 generator is equalized by directing the signal from the receiver's oscillator.
The port of the last generator has an 800 megahertz antenna configured. The RF output is connected to an amplifier, increasing the power of the device to sixteen dBm. After this, the increased signal reaches the antenna.
The inside of the GSM jammer is made from:
- tuning circuit;
- antennas;
- amplifier stage;
- source of interference.
Jammers work on different frequencies depending on the need to interfere with certain communication devices.
The VCO can be considered the “heart” of the entire device. It produces an RF signal. An RF amplification unit will be needed to expand the coverage area of the device. The tuning scheme comes with feedback and open. Sold in a variety of capacities. But it should be understood that with higher power the operating time will decrease. signals generated by the suppressor. The power supply keeps the device alive. It can be used as a lithium ion battery. But if you will be using a regular power source, be sure to purchase an AC adapter.
These are the means today that we have to deal with the side effects of those inventions that, perhaps, were intended for completely different, good and useful purposes.
I present to your court the design of a frequency suppressor. Quite simple and 100% working diagram Designed to suppress television and radio signals. The device will be able to jam almost any TV channel (except satellite, of course) at a distance of up to 15 meters from the TV. The device itself is an interference provider, the transmitter of which is made of only one transistor.
You can use literally any RF or microwave transistors. KT 368 (from the HF series) or KT 325, KT 399 (from the microwave series) are excellent. When using microwave transistors, the range increases to 50 meters. The circuit contains 5 - 6 turns of wire with a diameter of 0.5 - 0.7 mm, wound on a frame with a diameter of 4 mm. The circuit itself is quite simple and was taken from the radio bug circuit. The transmitting circuit was replaced, the circuit was changed so as to generate interference on the am-fm bands, because it is on these bands that many television and radio channels operate. The antenna is a piece of copper wire with a length of 20 - 15 cm, the latter can be excluded, but then the distance decreases. Rotation variable capacitor the device can be configured to specifically suppress channels that are in close ranges. The power of the device is enough for targeted suppression of 2 - 3 television or radio channels.
The jammer can be powered from 4 to 12 volts. Crown or corundum or any sources are perfect for this purpose. DC voltage which have a specified recoil rating. Such a device can also be implemented using microwaves. field effect transistors. The ratings of the radio components used can be deviated in one direction or another, we are talking about resistors, since capacitors in the circuit are critical and with a deviation of even 1 picofarad the circuit may not work at all or work with<< недугами >> - short range, high current consumption, unstable work and so on.
The current consumption of the jammer should be somewhere between 5 and 7 mA from the crown. In order to reduce power, you can increase the value of the emitter resistor to 100 ohms. Thanks to this, you can achieve a power of a couple of watts. Using powerful field-effect transistors, you can suppress (jam) the GPS range, and therefore mobile communications, we’ll talk about a similar design next time.
A radio signal jammer is a device small sizes, overwhelming television and radio channels.
It may seem that something illegal is being discussed. This is not entirely true. The radio signal jammer can also be used in for peaceful purposes. The principle of operation of the device is that it introduces interference to a pre-selected radio frequency. That is, one of the TV channels stops showing. The essence of the device is clear, now let's try to understand the scope of application.
The situation when a child is left at home alone is quite common. And if you don’t want your baby to watch certain TV channels, you can limit their viewing by using a radio jammer. It’s better to spend more time on your lessons. Well, it’s a sacred thing to play a prank on your mother-in-law, especially if she’s crazy about some TV series. Yes, before you make jokes, prepare yourself a retreat.
A radio signal jammer is a fairly simple mechanism that, with the proper experience and knowledge, can be easily made with your own hands. The generator, which, in fact, will create interference, is assembled on a KT325 transistor with a frequency of 900 MHz. In order to create a jammer with your own hands, you will need a frequency-setting capacitor, an emitter resistor, and antennas.
Such a DIY device is quite capable of handling frequencies in the range of 60 - 210 MHz. Channels with more high frequency, for example, satellite ones, will be too tough for our device.
You can adjust the power level that the radio signal jammer will have with your own hands using a capacitor. To carry out this procedure, it is necessary that it has a completely open capacity - 40 peaks.
As you can see, a radio frequency jammer is a very complex device and can only be manufactured by a highly qualified specialist in the field of radio electronics. If you are not one, then you should not try hard, because it is unlikely that you will succeed. For you the best way will buy a jammer and use a ready-made and fully functional device.
Deputy Director for Development Kerimov Rostislav.
In the summer of 2006 we organized a Summer Art Camp for media artists in Aizpute, Latvia. Here is a video of that time - the art group “Where the Dogs Run” from Yekaterinburg demonstrates in action the newly assembled “Antishanson” device, or a pocket jammer for the FM range. Indispensable in taxis, cafes and other public Russian places.
"Antishanson" - individual mobile device to protect and actively counter the interference of unwanted information from the radio airwaves (PMRG-personal mobile radio jammer). Allows you to quietly jam the selected radio frequency by creating harmonic radio interference in a given range. The device has a radio interference button “OFF FM” and a frequency adjustment knob. The cost of the device is $10.
Location of video recording - creative cottage for media artists, summer 2006, Latvia.
Performance characteristics:
Frequency range: 88-108MHz (FM)
Range: 5-10m
Supply voltage: 9V
Continuous operation time: 15 hours.
Overall dimensions: 35x50x25
NEW! Instructions on how to assemble "Antishanson" directly from the authors!
And more press reviews:
Resounding success
"Rolling Stone", No. 30
A group of Yekaterinburg artists “Where the Dogs Run” created a portable radio signal suppressor called “Antishanson”. The RS correspondent was the first to test this device.
The creators of the device say: “It will become a constant companion for taxi passengers and public transport, allowing you to quietly jam the signal of an unloved radio station by creating radio interference at the required frequency.” “Antishanson” resembles a pocket radio with a round frequency adjustment knob, a button for turning on interference and a wire-antenna and operates from regular battery"Crown" type.
Having secured the antenna under my sweater, I put the device in my pocket - nothing is noticeable from the outside. I'm catching a taxi. In the “six” that arrived, “Autoradio” was playing with might and main, and Uspenskaya’s song was playing. I get into the car and by touch begin to turn the Antichanson tuning knob, trying to catch the Avtoradio frequency. A few seconds later, Uspenskaya drowns in a stream of white noise and it becomes clear that the device is working. I press the static button and there is complete silence.
The Caucasian driver switches the radio to “Police Wave.” I'm doing the same operation. “What’s the matter, damn it! What are they having, a strike there?!” — the driver indignantly knocks his palm on the radio panel. Sitting on the next seat, I sympathize with him and make suggestions as to the reasons for the breakdown. The Caucasian begins to get nervous, mutters in an undertone, “Fuck you,” and desperately pokes all the buttons in a row, but without any result. Finally, outraged and upset, he turns off the radio.
The next victim of “Antishanson” is a small kebab shop near the Nikitsky Gate. The device instantly jams Gloria Gaynor singing on Radio Retro. The bartender turns the tuner knob in bewilderment, but a minute later inserts a cassette with a Soyuz studio collection into the tape recorder.
Once outside, I hail a taxi again. In the new Kalina there is an extremely intelligent-looking driver. Radio Jazz is playing muffledly. We talk about the skill of pianist Herbie Hancock. “You see, Hancock’s state of mind at the climax of the solo...” the driver says enthusiastically as the radio begins to hiss and goes silent. “Fuck!” — the intellectual says unexpectedly loudly and clearly and switches the player to CD mode.
In conclusion, “Antishanson” is tested on public transport. The sounds of “Russian Radio” can be heard from the driver’s cabin of trolleybus No. 42. As I assume, “Antishanson” copes with them without difficulty.
According to members of the art group “Where the Dogs Run,” the device was created manually as part of the conceptual campaign “Antishanson,” but at the moment there are already so many people willing to purchase it that the authors are thinking about establishing serial production. The cost of the device is only three hundred rubles. In the meantime, “Antishanson” exists only in a few copies.
If your thoughts are busy with whether to buy a radio jammer or not, the following information is for you. First you need to study this issue in as much detail as possible, learn more about the technology of work that you are going to use sooner or later.
Types of jammers
Essentially, there are many varieties of such suppressors. a large number of, but despite this, they all have the same operating rules. Tabletop and mobile radio signal jammers operate on a completely identical principle, with the only difference being the frequency of signal propagation. These devices transmit a signal with the same fluctuations as that of the device that needs to be jammed.
Mobile signal jammers can be carried with you, as they are mobile and light in weight. In addition, the functions continue to perform even at high air temperatures and humidity. Such a sensor also works in a car with the following range of action:
GSM 800, 900, GPS, GSM 1900, CDMA 450, 3, 4 G, Wi-Fi, GSM 1800. Using antennas, a block signal is generated that covers the entire radius (up to 40 meters). The load should be adjusted using antenna wiring. The device is equipped with a large radiator that quickly cools the radio signal jammer.
Yes, these devices, as already mentioned, are designed to broadcast a signal of the same vibrations as that of the device that needs to be jammed. Therefore, before purchasing, it is important to indicate that you need a jammer for all radio signals. Because if the fluctuations are different, then nothing will work. A radio signal jammer operates within a certain perimeter.
Today's 4G technologies are a modernized prospect for mobile phone communications with the most accurate code transmission. But nevertheless, if we talk about the signal jammer at your request, then its oscillation zone is omnidirectional. The device operates on all frequencies around, which creates a high suppression field.
How is a radio signal jammer used?
To start the device you need:
- Remove the device from the packaging.
- Connect the antennas to their connectors (place the colored circles on the antennas).
- Start its power supply.
- Adjust the power block for one range on the control panel (or turn the power to minimum - then the action will be cancelled).
As for protection, such devices are often installed in the interests of information confidentiality. For example, a mobile jamming unit can be installed in police agencies, military institutions, and prisons. Thanks to this, it is possible to prevent many attempted crimes, as well as prison escapes. Sometimes a radio signal jammer can also be used in hospitals where highly sensitive equipment is used.