GSM signal jamming scheme. How to make a cellular jammer. What does a jammer consist of?

The Internet community is increasingly interested in creating a DIY cell phone jammer, and in particular, many want to learn how to make such a device themselves. And many sites satisfy this curiosity by providing their own variations of schemes. This article also contains instructions from which you can learn how to create your own GSM jammer with your own hands. The main thing is not to forget about the complexity of the process of creating such a device. In order to create GSM jammers with your own hands, you need certain skills in working with electronics.

What are the methods of suppression?

There are only three of them:

1. Spoofing - sends a false signal to a mobile device, which disrupts normal operation.
2. DoS attack - blocking the GSM signal with interference, which makes it very difficult to receive or send signals.
3. Electromagnetic shielding is enclosing an object in a protective shell that keeps any signal within its coverage area.

To create a mobile phone blocker with your own hands, it is recommended to use the second method. Spoofing is too complex for the average user to use such a device. And the electromagnetic screen cannot be moved from its place, so the possibility of mobility is completely excluded. This is why it is best to use a DoS attack. Thus, you can jam all mobile devices within the range of the communication jammer.

In fact, assembling a GSM jammer involves combining several parts together. All you need is:

1. Voltage Controlled Oscillator (hereinafter referred to as VCO).
2. A circuit that allows you to select the desired suppression frequency.
3. An interference source that is usually already built into the circuit.
4. Frequency amplification unit (amplifier stage).
5. Antenna.

The VCO is the most important part of the GSM jammer, which you will create with your own hands, it can be said to be its heart. It produces a signal that affects certain devices, blocking their operation. In order to determine what frequency to tune the generator to, you need to know the exact frequency at which the device being jammed operates. This will help improve efficiency, although the jammer will create problems even when operating at just a close frequency. Think in advance about the size of the suppressor you plan to create with your own hands. This could be a portable cellular jammer, or a DIY desktop cell phone blocker.

The tuning circuit can be open-loop or with feedback. It is much easier to make an open-loop system, but closed-loop systems have their advantages. The first scheme uses sawtooth oscillations from lower to higher frequencies. The second circuit uses a PLL, which allows you to maintain a stable frequency of the generator. In the second case, you will need to use a programmed controller, which must be configured correctly, because later it will be impossible to configure.

To expand the frequency jammer's coverage area and its power, it is necessary to use a frequency amplification unit. As the suppressor power increases, the suppression zone will expand, but at the cost of operating time. The more powerful the device, the faster the battery will drain. This feature should be taken into account when choosing an amplifier stage model.

The antenna transmits the signal generated by the suppressor. The antenna is characterized by its Voltage Standing Wave Ratio (VSWR). It is best to choose an antenna with a VSWR of 3 or lower. In this way, the antenna return loss can be minimized. It is best to use SMA antennas, which can be easily replaced with others or removed. Also take into account the fact that it is better to buy an omnidirectional antenna, otherwise you will have to point it at the object being jammed, like a remote control at a TV.

And, of course, our DIY jammer will not function without a power source. Typically, 5V DC voltage is sufficient for a mobile phone suppressor. You can use a regular lithium ion battery. In order to be able to use a standard power source, you will also need an AC adapter.

Typically two types of network adapters are used:

• Capacitor voltage doubler. This is a fairly effective and easy-to-use device, but it also has some disadvantages. Due to the inability to adjust the adapter, you will also have to use the MPN regulator, otherwise it will be impossible to adjust the voltage.
• Inductor pulse stabilizer with boosting action. It can be adjusted, but it also costs slightly more than the first option, in addition, it is more difficult to operate. For its stable operation, all components must be selected perfectly.

Despite the high cost, as well as the difficulties that arise, it is still better to use a pulse stabilizer. The time and financial costs are completely worth it. AC and DC adapters can be found for almost any mobile phone jammer.

Notes

Signals from older models are easier to suppress because their operating power is lower. Therefore, the range of action of the jammer will expand significantly. But, new mobile phones are somewhat more difficult to jam.

For powerful GSM jammers, it is worth installing cooling systems so that they do not overheat.

Having sufficient skills, dexterity and experience, as well as having access to the necessary equipment, you can program the PLL system, this will allow you to regulate the operation of the jamming device.

Actually, that's all. All the basic information that is needed in order to understand exactly how a GSM jammer is created is indicated.

To purchase portable jammers, you need to go to the appropriate section of the site.

Deputy Director for Development Kerimov Rostislav.

How to make a cellular jammer

People who are interested in designing or creating radio-electronic components and devices often ask questions:

1. how to make your own cell phone jammer,
2. how to make a cell phone jammer,
3. how to create a GSM jammer for a phone or other similar questions.

That is why we decided to present you with a review of how you can make a mobile phone jammer at home.

I would like to immediately warn you that the device, as well as the technology for its creation, is very complex, so in order to make it, you must have the appropriate knowledge and the ability to work with such elements. If you do not have such skills, then it is better not to even try to make a jammer, since it is unlikely that you will succeed.

It will be much easier to purchase a ready-made cellular jammer, which is presented on our website in a huge assortment, and besides, the prices at which we sell them are very decent. Here you can choose a jammer of any parameters and sizes, which will become effective assistants for you in the fight against the leakage of confidentially important information.

So, further in the text, we will provide an overview of how you can make a cellular jammer yourself. Since most mobile phones operate at 800 MHz, we will make a GSM jammer specifically for this frequency range.

A sweep generator will be used as the basis of the VCO. To assemble a GSM network blocker, we use a jammer that works to isolate clock signals at 45 MHz; it must activate the receiver local oscillator ports, which are located on the chip. To stabilize the resistance of the clock generator and the local oscillator port, the local oscillator signal of the receiver will be passed through the impedance matching network.

We connect the local oscillator port to the 800 MHz antenna, which is also an RF input, and the RF output will first be sent to a specialized signal amplifier, which will strengthen our cellular jammer, increasing the output power by 15-16 dBm. The amplified signal is then transmitted to the output antenna.

The frequency range of all mobile phones operating according to the 800 MHz standard constantly varies within 45 MHz, respectively, the frequencies of the input and source signals will differ from each other by exactly 45 MHz. For these reasons, everyone who calls within the operation of our mobile phone blocker will hear only their voice in the speaker, since the same signal that was sent is returned to the phone receiver.

Among other things, such a cellular jammer can be used as a blocker for GPS trackers or other tracking devices, since the device will block cellular communications, which trackers use to record and transmit recorded data.

Also, such a mobile phone jammer can provide protection against explosions of homemade bombs that use mobile communications to activate the detonator.

A short tour of the work and a diagram of the device

The device uses a 600 MHz frequency converter, which has been slightly improved.

Even though the RF amplifier increases the overall power consumption, it is still impossible to do without its participation.

An old aluminum block was used as the housing, and VHF connectors from a Motorola mobile phone were used for output and input.

We solder the VHF connectors to the contacts of the microcircuit used.

We install a voltage regulator and a 9V battery for power inside the device body. We separate the battery from the rest of the device to prevent short circuits.

We install antennas to the inputs, a toggle switch on the circuit to the power supply.

That's it! The cell phone jammer is ready, as you can see, to make it, I had to work a lot with a soldering iron and carefully select components for the device. Considering how much money and time the whole procedure required, we can definitely conclude that it is much easier to buy a mobile phone jammer without racking your brains over its creation.

Head of the technical support group Vladimir Nesterenko.

Instructions

Buy a regular signal jammer; these can be purchased at radio equipment sales points in your city. Find out the frequency of the waves you need to suppress and program this device. These could be various navigators, antenna signals, radios, telephones, and so on.

In order to assemble the jammer yourself, use the following diagram: http://samodelnie.ru/skhema_glushylki.jpg. In this case, you can suppress any television and radio signal within a range of up to 10 meters. Please note that very powerful signal suppression devices can damage equipment.

When assembling a signal suppression device yourself, please note that the loop coil L1 should not be on the same axis with the inductor L2 and should be removed at a distance exceeding 2 centimeters. As an antenna, use a piece of wire 20-40 centimeters long.

When setting up, it is best to have a dielectric screwdriver in your tool kit. The inductor in this case should have about 10 turns, and the wire should have a diameter of 1 millimeter. Its frame should be 10 millimeters, and the inductor should be wound around an MLT 0.5 resistor. Its rating is 100 Ohms, and the wire should have a diameter of 0.1 millimeters (100 turns).

When using this device, please note that if you use it to interfere with someone else's equipment, you may be subject to legal action. If your neighbors are disturbing your sleep with a loud radio or TV, use the legal means available to respond: just call the police. According to the legislation of the Russian Federation, it is unacceptable to violate the silence regime after 23:00 in the evening. If you are sued for using a jammer, you will not only be required to pay a fine, but your equipment will be confiscated.

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Please note

There is a fine for using such funds.

There is nothing difficult in assembling a phone, but only if during disassembly you did not damage any of the parts of the device, in which case it is best for you to contact specialists.

You will need

• - thin flat screwdriver;
• - a mild table knife.

Instructions

Disassemble your phone by first turning it off and removing the battery. Unscrew all visible fasteners, pull out the special plugs and unscrew the bolts under them; this is very often found in clamshells. After that, proceed to open the phone case. Pry it on one side, and then on the other. Try to use less force as you may break the housing mounts.

Please note that some phone models can be held together using special glue; here you will need a mild knife or a thin flat-head screwdriver. Place the phone on its side in a stable position (it will be better if someone helps you), place a screwdriver or knife along the connection line of the phone body parts and lightly hit the tool with your palm, as soon as you feel that the phone opens, separate the parts using the knife.

After opening the case, remember the order in which you disconnected the phone parts. Try not to damage the connections between the wires and cables of the screen and the microcircuit. In order to remove the circuit, unscrew the bolts, usually located on the sides and in the center. Be careful, if your phone has Wi-Fi functionality, it's best not to disconnect the modem unless absolutely necessary. The same applies to the phone camera.

Be careful when removing the speaker - it is usually soldered to the internal circuit board of the phone, so during reassembly you will have to somehow restore its position. Remove the keyboard, disconnect the fastenings of the remaining internal elements of the phone.

Reassemble the phone in reverse order. To better remember the sequence, record a video of the disassembly, or simply write down your actions on paper.

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Useful advice

Do not use regular kitchen knives to open your phone.

Assembling any phone is carried out in the reverse order of the procedure for disassembling it. Before disassembling your mobile device, read the terms and conditions specified in the warranty card, and also read the technical documentation regarding your model.

You will need

• - a small Phillips screwdriver;
• - a thin flat screwdriver or a mild knife.

Instructions

Prepare the work surface in such a way that it is convenient for you to disassemble the phone without losing its small parts, and also so as not to damage the internal devices. Choose a screwdriver that is sized to fit the screws on your phone, because if it is larger than the sockets of your phone's screws, you may damage the fasteners and then have to replace them.

If you have a camera with a video recording function, record the disassembly process so you don't forget the sequence later. If you do not have this opportunity, simply write down the process step by step on paper and sketch the device connection diagrams, if necessary.

Turn off your phone, open the battery cover and remove the battery. Take out the SIM card and removable storage. Unscrew all the existing screws from the back wall of the phone; note that in some models they may be hidden under special service stickers. After this, carefully pry off part of the body of your mobile device using a flat-head screwdriver or a mild knife, or best of all, use a plastic card.

If necessary, carefully remove the camera from the back of the case. After removing the phone case, carefully examine its contents. Unscrew the chip, disconnect the phone's keyboard, and don't forget about the side buttons for locking the device and adjusting the sound level. Remove the keyboard buttons by pushing them in from the outside.

Reassemble your mobile device in the reverse order, paying attention to the size of the screws matching the threads of the case. Be sure to secure the screws on the internal devices of the phone to prevent them from breaking the next time your device is dropped. Insert the SIM card, replace the removable drive and battery. Close the phone cover and check its operation.

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Useful advice

Before disassembling the phone, cover the surface with a light cloth so as not to lose small parts.

If you're tired of the noise your neighbor's radio makes, or you want your child to turn off the radio and sit down to do his homework, you might want to mute or reduce the signal reception. The person will turn off the receiver himself.

Instructions

Take the KR555LA3 microcircuit and solder the signal jammer using a soldering iron, tin and solder on it. Use the diagram below. Use 2 batteries of 1.5 each as a power source. This device will perfectly drown out any signal.

Try purchasing and using a portable stun gun. A stun gun easily creates quite powerful interference. However, they are not directional in nature, and it is difficult to constantly activate its work.

Try using a noise generator from a simple electric lighter for a gas stove. It, like a stun gun, creates strong interference, covering a wide range of radio frequencies. An ordinary radio becomes practically useless. It also has a non-directional effect and also has a very strong effect on the entire electrical network. Thus, you will interfere with all your neighbors, and your television and radio will not have good signal reception. Use caution as electric shock can be very unpleasant. You can screw a regular wire to the lighter, which will act as a transmitting antenna.

A portable signal jammer can always be made from a regular gas lighter with a piezoelectric element. The disadvantage is that you have to press the button constantly. To enhance the effect of this electrical noise generator, attach a piece of ordinary wire to one of the electrodes that are located next to the piezoelectric element. The interference will not be strong, but the constant clicks that will be heard through the radio speaker will force it to turn off.

To eliminate the problem associated with tracking, you will need a communication suppressor device that suppresses the navigator and also introduces certain interference during its operation. Such jammers are sold in an electronics store, or created with your own hands if you have some knowledge in the field of radio engineering.

What does the jammer consist of?

The jammer, as in the photo, consists of certain elements:

• A generator for voltage regulation, through which the overvoltage of the entire system is removed and combustion is prevented. It also enhances the current flow, while maintaining the functionality of the entire system at any voltage.
• Antenna. This device uses various types of transmitting elements, but the more suitable one is SMA, which provides the maximum coverage area and also operates in the desired frequency mode.
• Amplifier. A certain part of the circuit that is responsible for supplying a powerful signal.
• Scheme. This element includes a generator as well as a coil. The first produces vibrations that are gradually transmitted to the coil.

To ensure uninterrupted operation of the gadget and avoid communication jamming, you will need to wind the required number of turns. The duration of operation of the device and the gain directly depend on the correct choice of core.

The design also provides other details, thanks to which it functions in different modes:

• interference in the functioning of tracking devices, which makes it possible to remove a phone or car from radar screens;
• changing the signal so that it conveys distorted information.

Photos of do-it-yourself jammers

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 tired of parking some uncomprehending drivers 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.