Make a jammer for mobile phones. Using mobile phone jammers

A cell phone jammer is a device that allows you to jam the signal of a mobile phone. The devices can also be used to suppress other impulses.

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Principle of operation

The operating principle of GPS blockers is simple. The device works by emitting a special pulse within a certain frequency, just like a device that needs to be silenced. A special field is formed around the suppressive blocker; impulses emitted by other devices are lost in it.

Types of jammers by form factor

Let's look at the types of suppression devices by form factor.

Stationary jammers

These devices are designed for continuous use in a specific location. In order to ensure working condition, the device must be connected to a household network. The weight of such a device is up to 5 kilograms. A distinctive feature of the systems is the ability to simultaneously generate a suppressive field in several frequency ranges. Their number will be 10 or more.

User ul sound talked about the operation of a stationary communication jammer made independently.

Portable jammers

Portable devices are less powerful, but they are small in size, so they can be carried in your pocket and activated when needed. The weight of the jammer is about 300-700 grams. Portable devices may use three to six antennas that are designed to reject different frequency bands. The average operating time of a telephone jammer of this type is from one to three hours.

Covers-blockers

On sale you can find special blockers manufactured in the form of covers. They were originally developed to prevent mobile operators from tracking the subscriber's location. Such cases usually have several compartments. One of them is necessary to block impulses, and the other is used to protect the human body from harmful radiation.

Scope of application and ranges of suppressors

Let us consider in detail the purpose and scope of application of the devices.

cellular

Devices for jamming radio communications can be used in business negotiations, theaters and any other places where silence is required. In large cities, administrations of cultural institutions often use simple blockers. If a person forgot to turn off his mobile phone at an important event, then a GSM telephone jammer will not allow him to use the device.

Devices that allow you to jam the signal are also used to prevent wiretapping, which is carried out through GSM bugs.

Ranges in which the cellular jammer operates:

from 925 to 960 MHz in GSM 900;
from 1805 to 1880 MHz in the GSM 1800 band;
from 2110 to 2170 MHz in the 3G range;
from 2570 to 2690 MHz when operating in the 4G WIMAX range;
from 791 to 820 MHz in the 4G Lite band;
from 850 to 894 MHz in the CDMA range, however, since 2010 this range has not been used by domestic operators;
the device operates in the range from 1900 to 1930 MHz; this standard is not used in Russia.

The How-todo channel showed what a homemade cellular jammer looks like.

Wi-Fi/Bluetooth

Devices of this kind are usually combined in one device with gadgets designed to suppress mobile communications. Used to block information transmission channels via wireless cameras. This allows you to provide reliable protection against data leakage. If such a blocker is used in a building, then in addition to cameras, routers and other wireless devices, for example, mice and keyboards, will be inoperative. Also, users will not be able to transfer data via Bluetooth. The operating frequency range of such devices is from 2400 to 2500 MHz.

GPS/Glonass

They are often installed on work vehicles of courier companies, as well as companies involved in cargo transportation. Their use allows you to control the location of the vehicle. Anti-trackers are used to suppress the signal of such beacons. This is a small device designed to connect to a car's cigarette lighter and block impulses from GLONASS and GPS systems. Some device models can be equipped with a GSM plug. Such devices are used by car thieves to prevent the possibility of surveillance of a stolen car.

Working ranges:

from 1570 to 1620 MHz for GPS L1;
from 1200 to 1310 MHz in the GLONASS L2 or GPS range;
from 1380 to 1410 MHz in the GLONASS L3 or GPS range.

Radio

On sale you can find devices designed to jam radio signals. In stores they are called “Antishanson”. Suitable for blocking the operation of corresponding radio stations. Can be used in minibuses, buses, and also in establishments where they listen to chanson. The operating range is from 88 to 108 MHz.

User Ivan Kuznetsov in the video talked about the features of the assembly, and also showed the principle of operation of the radio jammer.

Audio recording

There are commercially available devices designed to generate microphone interference.

There are several options for blocking a record:

Ultrasonic. The gadget creates ultrasound, which a person cannot hear, but can cause interference. It blocks voice recording made using a voice recorder or smartphone.
Acoustic. Such a device creates interference, which the human ear perceives as a choir of voices.

Sound blockers are usually sold in speaker housings and are easy to integrate into your interior. The average weight of the device varies around several kg. The device must be controlled using a special remote control.

For signaling

A jammer can be used to suppress signals transmitted from the remote control to the car alarm control unit. This will prevent the possibility of the anti-theft system turning on or off at a certain frequency. If necessary, you can use a device that will not only prevent the signal from being transmitted, but will also damage the equipment.

The operating frequency range is 315-433 MHz. Many household appliances operate at this frequency. Therefore, when the blocker is activated, other devices may become inoperative. The range depends on the manufacturer, but on average it is up to 100 meters.

Is it legal to use?

The legality of use is determined by the specific state. Russian legislation is more lenient, so the use of cellular jammers in our country is not prohibited.

In the United States, a person faces a serious fine of up to $50,000 for using such devices.

Suppressor Installation and Operation

To use the device, you must install the antenna adapter in the appropriate connector. The signal blocking process will begin 10 seconds after the equipment is activated. Depending on the type of device, the range and activation principle will be different. The device can operate both autonomously and from a household network. If the device is for a car, then it must be installed in the cigarette lighter. Autonomous devices can operate on batteries, so the battery will have to be charged from time to time.

Some blockers, after activation, work poorly and cannot perform their main function. Or they block signals, but the effect applies to a specific provider. This means that the mobile operator uses different frequencies.

You can learn about the features of using plugs from the video provided by the Gruz 300 channel.

To ensure full working condition, you must do the following:

Remove the switch.
Unscrew the antenna adapter and remove it from its seat.
Remove the blocker cover. For removal, there are special fasteners or bolts on the case that can be unscrewed with a screwdriver.
Remove the board from the device.
There is a tuning resistor on the circuit; it is used to operate at a certain frequency. The resistor element must be tightened with a screwdriver.

How to do it yourself?

To make a muffler, you will need a frequency swing generator device. A generator device is also needed to create interference; the device must operate to generate pulses at 45 MHz. This generator includes receiver ports that are on the board. To ensure resistance stabilization, the pulse that comes from the local oscillator passes through a special matching network. The device port is connected to the antenna adapter and is used as an RF input. And the pulse output is sent to the amplifier. Subsequently, the amplified signal is sent to the antenna.

The assembly procedure goes like this:

Prepare the body. An aluminum block is suitable for this.
Our example uses connectors from an old Motorolla phone as output and input.
The plugs are soldered to the outputs on the microcircuit, which is used as a base.
A voltage regulator is mounted in the device body. A battery is also installed; it should run on 9 Volts. The battery must be separated from other components on the board to prevent short circuits.
The antenna adapter is being installed to the inputs. The device switch is connected to the power circuit.

As you know, every action has a reaction. So, since the first communication system appeared, all sorts of methods have appeared that make it possible to effectively interrupt it.

It doesn’t matter at all whether it’s a conversation on a mobile phone or a banal wireless connection - absolutely any radio communication can be jammed.

Let's dive into theory

The principle of radio communication jamming itself is not complicated. To do this, it is only necessary that the operation of the receiving antenna be disrupted by interference, which will be comparable in level to the signal. Using such a banal and simple scheme, you can easily jam any signal, be it radio broadcasting or mobile communications.

Mind and heart - a constant struggle

Let's dive a little into history and remember how during the Soviet era, all friendly countries were surrounded by dozens of enemy-type radio stations that broadcast from everywhere. Soviet radio suppression at the time was aimed primarily at Radio Free Europe. Anti-Soviet broadcasts, which literally destroyed the human brain, were broadcast from every corner of the world.

Military radio communications - nothing is impossible!

Absolutely every country at one time or another used special jammers to suppress enemy communications signals. It is clear that the USSR, since it was the founder of radio communications, reached considerable heights in this area.

You need to understand that at that time the network of radio jammers was spread throughout the USSR better than the Internet is today in Russia.

The subscriber cannot receive your call...

It is clear that jamming the radio today will not be difficult, 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 using the method of orders than noise, in the 21st century a new victim of jamming has appeared - mobile communications.

Mobile communications are jammed quite often, although we sometimes have no idea about it at all. The average person can come up with anything:

"glitch";
poor coverage;
Not paying attention at all to the loss of the network is better than believing that it was jammed.

This does not mean that your communications are being jammed because they want something from you. Jammers can be activated in places where special operations are carried out or near government highways. Network jamming can also be detected in:

hospitals and cafes;
meeting rooms;
conference rooms;
commercial structures, etc.

And there is absolutely nothing surprising about this today, because on public transport there may be a person standing or sitting with you who will have a jammer in his bag, which is activated to suppress the mobile network.

Why would an ordinary person suppress mobile communications?

You may ask why this is being done, because a cafe or public bus is not a place for business negotiations. Why turn on the jammer? The answer to this question is simply simple: for your own peace of mind. Just imagine that on a bus crowded with people, next to you there will be, say, a man “in charge” who decides to “divorce” his wife over the phone. You won’t beg him to speak more quietly because it annoys you, or argue with him? That’s right, it will be much more effective if you lightly press just one button and the person’s mobile connection is lost.

Shall we mute something else?

At the beginning of this article, we already said that you can jam 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.

Car alarm - easy to silence

In addition to mobile communications, today you can easily silence a car alarm. To achieve this goal, you can use both homemade and special devices. Please note that if you try to lock your car, the alarm key fob flashes, but nothing happens, then someone nearby is trying to silence your alarm.

Again, it’s difficult to talk about bad goals here. Of course, a car alarm can be jammed 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.

Buying is as easy as shelling pears!

Whatever your goal, if you need a communication jammer, you can always purchase it in a specialized store or on an online portal. The main thing is that you need to initially decide for what purposes you will use it, what you will jam:

Internet;
bluetooth;
alarm;
mobile communications.

Depending on the goals presented, you will need to select a device model that fits the required parameters: perhaps a weak jammer that will suppress the signal of the radio transmitter will be enough for you, or you will need a more powerful option. It is important to remember that it is recommended to use such devices exclusively for good purposes, so that you do not end up harming yourself.

Sometimes there is a need to make a lot of interference for TV and radio bands. For example, your wife is watching “Don’t Be Born Beautiful,” and you need to watch the Champions League. For this purpose, special devices are used - “Radio Jammers” or popularly “Pig”. They are characterized by a short range (50-100 meters) and a good ability to jam the signal. The picture and sound may disappear completely.

Below is a diagram of a simple device for jamming television broadcasts.

R1 - 3.3k, R2 - 1.5k, R3 - 1.5k

C1 - 8...30 pF (Trim capacitor)

C3 - 5-10pF (4.7 pF), C4 - 56-69 pF (27 pF)

L1 - coil on frame 6 mm, 4 turns of wire 0.5 mm

Antenna 40 cm stranded wire

Muffler power supply - 3 Volts. The adjustment is made by a tuning capacitor and shifting and stretching the coil turns.

Option II

Radio-TV jammer

Are you tired of your sick neighbor who listens to “TaTu” on the radio from morning to evening, forgetting about sleep and about his neighbors? Does your mother not let you finish watching your favorite cartoon, clicking buttons on the remote control in search of your favorite series? Are you tired of living like this, do you want to get rid of evil neighbors and stupid TV series? Then go into the closet for your expensive soldering iron and read this article carefully!

If you think that to realize your deepest dream you will need a bunch of green presidents to buy a new TV, then you are very mistaken. All you need is a soldering iron and a couple of parts. If you understand correctly, today we will start making a simple “Radio and TV Silencer”. “Well, finally this hell will end!” - you will say and... you will be absolutely right.

What is this?

You are walking down the street accompanied by pretty girls. You notice that they are listening to the radio in the car. Here you make a couple of movements in your pocket. Now, instead of songs, you can hear crackling, squeaking and other crap coming from the car...

Heh... The girls are delighted with you, especially with the movements in your pants.

How it was

Why did I like this scheme? Everyone! First of all, a minimum number of parts, less can only be found in a TV. I also liked the simplicity and ease of use. Of ALL my friends who are far from electronics, ALL managed to collect it. Which I regret to this day. The object for testing, as you already knew, was my box.

By the way, when you try out this 198th wonder of the world, be extremely careful of cars with large antennas on the roof! They are popularly called "Direction Finders". Why be afraid of them? It’s just that the next time you jam the radio for your 98-year-old grandmother, she, without hesitation, will call the radio station on her mobile phone. Granny will tell them that her branded radio does not work. Operators, having checked and made sure that everything is working perfectly, can send a machine with “horns” to the area where the radio signal is leaking. And she will find you without difficulty. They will take care of you with special zeal if this “grandmother’s radio” turns out to be a police or fire wave.

Let's start with

Making this device is a bit like building Lego. If you don’t have the necessary parts in your inventory (and you most likely don’t have them), then your direct route to MiTiN0 BaZaR. Well, or if you want to buy a really high-quality thing that will drown out almost all frequencies and your budget allows you to spend 300-500 dollars, then this is your place - www.jammer.su. All you need to buy is a mikruha and a trimmer, the approximate appearance of which you see in one of the photographs.

Although there will be no need to buy a capacitor if you have an old radio lying under your bed. You will remove it (the part) from there (do not forget to disinfect your hands with ammonia and wear special gloves before doing this). So, I stocked up on parts for two years, what next? And then you can plug the soldering iron into the right socket of the left corner of the top table and calmly run “on the path” so that nothing distracts you from your work.

Okay, you can go back. The soldering iron won't wait for you. Take it in your right hand, this manual in your left, and begin to thoroughly study the diagram so as not to interfere with your two-year supply of parts. Why did it burn? Yes, because there was no need to be distracted by physiology. A soldering iron should be 40 watts, not 100. Microcircuits tend to burn out at high temperatures! Remember these simple but necessary words. Although, if you have a domestic microcircuit... To burn it, you need a gasoline torch or a welding machine. In short, DO NOT be afraid to experiment! Only through experiments will your individual model of Glushak be born.

I won’t suggest you to use fiberglass, there’s too much extra hemorrhoids, it’s best to solder with suspended mounting (wires to the legs). No circuit board, noise and dust.

Soldering

Well, you've finally come to one of the most important moments of this operation. When you're soldering, try not to be distracted by anything, especially by the naked women who stick out on every millimeter of your monitor (this is a nuisance, I know from my own experience).

You will need 5 cm of solder (if you still haven’t learned from your 5-year-old brother what this is, read our FAQ). And rosin. If there is no rosin, you can use any solder paste or soldering liquid (HC-l, for example). Just don’t use shoe polish under any circumstances, it stains everything a lot. If there is no shoe polish, don’t be upset, you can safely solder without it. The soldering will just be less neat. In extreme cases, you can even screw everything together with wires.

There are two ways to solder the legs of the microcircuit to each other:

Having bent them a little, solder them together without additional material.

Without bending them, just solder an additional piece of wire, it's up to you.

First, you need to connect the power supply. The whole procedure consists of attaching the wires from the battery. They are connected like this: to the 14th leg “+”, and to the 7th leg “-”.

As I already explained above, soldering a microcircuit must be done extremely carefully; it is not advisable to hold the soldering iron on one leg for more than 10 seconds (it’s not possible, but if you really want to, then you can). Oh yes, I forgot that you’ve already bought parts for two years, which means you’re not afraid of it. As can be seen from the diagram, legs 2 and 3, 4 and 5, 1 and 6 are soldered together, and some of them are not used.

The second stage of work comes down to soldering the variable capacitor to the soldered legs: “3 and 5” and “1 and 6”. Now the time has come to extract the most important component of this elixir from my grandfather’s old Voskhod receiver. Your goal is a small square or round part with which you can adjust the frequency of the radio channel. Found? Take a saw and saw it off with all its giblets, just don’t forget to unplug the receiver from the outlet before doing this. Grandpa will be happy...

This part has two contacts, the polarity of which does not matter - you can attach either side. From the inside, it consists of a pair of thin plates, with the help of which the desired frequency of the radio signal will be adjusted. It is better to solder it onto wires 5-7 cm long. Or you can do it directly.

Out of 10-15 such jammers, only one did not work. Do you want to know why? It’s just that instead of the 74LS04 chip, I accidentally installed a K555TM2, and it simply burned out! But it was necessary to install K555LN1, it is the Russian analogue of 74LS04. I think the Russian brother is even louder than the American one (although it depends on how you look at it). But the main thing: K555LN1 costs 2 rubles, and 74LS04 - 20 rubles.

At the next stage of the operation, you will need a piece of wire a meter long, which will play the role of a contact antenna. It must be attached to the 6th blade of the small circuit.

Finish

Take one last look at the diagram and the resulting salad, and ask yourself whether the assembly was correct. If you are sure that you have assembled everything correctly, click YES. If you make a mistake, click on the NO button and start re-reading this manual. Although it could easily turn out that your mistake will make our Silencer even cooler. After all, the microcircuit operates in non-standard modes.

Let's build the body

The easiest way to make a case is to find a suitable box of the required dimensions. A pack of cigarettes or a box of condoms will do. Only after this can we safely proceed to the most delicious part - setting up our pest.

First test

The test must be carried out in the FM band. Turn on any radio station and start turning the trimmer capacitor knob with a wild scream (you must shout). Oh no, nothing works and never will: we forgot about the battery. Run to any kiosk and buy a 9-volt Krona battery. Everything should now be funded!

If you suddenly don’t have extra money for a new battery, don’t worry: any alternating current source will do. The voltage of such a source should be no more than 6-12 volts. But in any case, I do not recommend using this method. You understand why. Well, where will you go with an extension cord and a power supply?

True, power supplies also have little juicy delights. Especially if the source is homemade and works poorly, it will create another source of noise. Now we will have two noises hanging out, and everything will be more tweezers. And you can get a lot of power from the source.

Settings

The whole setup comes down to finding the frequency of the radio station on your hacker device. After scrolling the capacitor slider back and forth a couple of times, you will find that at some point the sound in the receiver disappears. After that, turn it more slowly. No, that’s not the way it’s done, that’s only the way firefighters handle it - they need to be more gentle. Imagine this is your favorite... nightstand handle. Hey, don't get carried away so you don't miss the precious millimeter. And finally, all receivers within a radius of ten meters will become silent, just like your mouse is silent.

The same thing happens when the TV is on. True, the effect is a little worse. This is due to the fact that TVs have become smarter. I also have cable television at home: I had to wrap the entire antenna around the television cable in order to at least slightly disable this miracle of technology. But still, my friend was unable to watch episode 38235 of “Manta the Barbarians”. So think for yourself where you will use the jammer. If you still decide to turn off the radio, then you don’t need to change anything. But if your goal is a TV, then I would advise increasing the length of the antenna by about two times...

Experiments

Don't take this diagram as a standard. Just one of the options... In fact, it is enough to solder a couple of legs of the microcircuit with a loop of wire as long as a finger. Even this simple design will make noise. And if you make several such loops, for example, between the 1st and 2nd, between the 3rd and 4th, between the 5th and 6th... It will also make a very cool noise =). So you shouldn’t be too much of a monkey, it’s much more interesting to experiment. Install another battery, another capacitor, change the length of the wires between the legs, the length of the antenna. Write to us about your experiments, we will publish them.

Such suppressors and jammers of mobile phones have different ranges. The simplest of them work at a maximum of ten meters. Others are perfect for a small space or car. We will not consider more powerful suppressors in this article, since their use can lead to serious consequences.

Thanks to such devices, it is quite easy and simple to protect yourself from various spyware, which are almost impossible to detect due to their miniature dimensions, but such jammers can easily cope with a possible problem.

The basis of the design is a broadband noise generator ideal for jamming cellular and mobile signals.

With correctly selected transistors and an increased voltage of the power supply, the “Tetra-Fast cell phone jammer” circuit can easily leave mobile phones without a GSM signal. The jammer has been tested in operation, is quite simple to configure and manufacture, and the number of radio components has been reduced to the minimum possible.

The range of emitted frequencies is from hundreds of kHz to 1 GHz. The circuit is so simple that, provided that the radio components are properly assembled and in good working order, 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 the 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 minimum length, exclusion of sharp turns and 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, you need 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 30 MHz - 1000 MHz. Bipolar transistors VT1-VT4 require radiators. Resistors R1 and R2 can be replaced with one 4.7 Ohm 10 W power.

I'm sick of some uncomprehending drivers parking in a flower bed near the house. There is a simple and legal way to teach them a lesson, namely: to assemble a simple circuit for influencing a car alarm. And after this, the car located within the range of the device will not be able to be set or removed from the alarm system.

In some cases it may be necessary to generate greater interference to TV and radio receivers. For example, my wife is watching a stupid TV 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.

I present to your court the design of a frequency suppressor. A fairly simple and 100% working circuit is 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. By rotating the 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 DC voltage sources that have a specified output rating are perfect for this purpose. Such a device can also be implemented using microwave 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 operation, etc.

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.