DIY jammer: assembly diagram and recommendations on how to make the device correctly

Manufacturing nuances, setup

Resistors with capacitors can be manufactured using current mirrors, as well as similar replaceable elements.
This substitution will reduce not only the size of the gadget, but also its cost. An important nuance is the setting that allows you to eliminate problems associated with jamming other signals. To eliminate frequency mixing, it is necessary to adjust the existing inductor, on which the outgoing frequency directly depends. This action occurs due to a change in the number of turns placed on the core.

Further, the instructions for creating a jammer for inexperienced craftsmen provide a device for the functioning of the amplifier. This device shows the increase and decrease of the signal, which is not always effective during operation of the device. In some cases, it is desirable to minimize the gain percentage, thereby reducing interference.

Adjusting this indicator consists of experimentally adjusting the required amplifier manually, while simultaneously checking the functioning of the complex as a whole and its effect on the tracking device.

An element such as an antenna does not need tuning, but you should choose it as seriously as possible. According to reviews from radio amateurs, it is best to equip an SMA antenna, from which the signal goes in different directions and which is characterized by the highest gain.

A communication signal jammer can be created with your own hands from other types of transmitting elements:

whip type antenna;
panel type;
log-periodic.

Depending on the coverage area, a choice appears that is related to the number of antennas to be equipped. If it is necessary to obtain a finished result within a few meters, 1 part is used, while up to 4 parts are installed in individual structures.

Rights to use the gadget

If we talk about allowing the use of such gadgets, this is prohibited in our country. Even devices sold in specialized stores are not allowed to be used without the necessary permission.

Before obtaining the necessary permission and before creating a jammer with your own hands, you need to pass tests. Undoubtedly, a model created independently is not confirmed by any permit, which is precisely why it can be used illegally.

Since the device has low power and is used exclusively for civilian purposes, tracking it is quite problematic. Basically, problems will arise when a driver is caught with such a device, which can result in a huge fine.

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How to register a jammer?

The easiest way is to go to the government services portal and submit an application electronically. However, you will still have to go through the motions to obtain permission to jam - an invitation will be sent to your personal account on the website.

The statement states:

Full name, TIN, place of residence, details of the identity document of a citizen of the Russian Federation;
type, name and number of the registered device;
number and date of permission to use radio frequencies (radio frequency channels) for radio-electronic equipment issued in the name of the applicant (if such is provided for your jammer by the legislation of the Russian Federation);
numbers and date of the certificate of formation of the call sign (if such is provided for your jammer by the legislation of the Russian Federation).

Permits are issued by specialists from the Federal Service for Supervision of Communications, Information Technology and Mass Communications. They will have to present a long list of documents:

information on the technical characteristics and radiation parameters of registered radio-electronic equipment and high-frequency devices;
SCRF decision to allocate radio frequency bands for high-frequency devices in the event that the operating radio frequency band of the high-frequency device does not correspond to the list of radio frequencies intended for use in industrial, scientific, medical and household high-frequency devices (list of frequencies here);
decision of the SCRF on the allocation of radio frequency bands for radio-electronic equipment if such a decision provides for the possibility of using radio frequencies or radio frequency channels without obtaining permission to use radio frequencies or radio frequency channels (for most devices this is the decision of the SCRF No. 05-10-03-001 “On the allocation of a band radio frequencies 0.1-1000 MHz...");
permission to use radio frequencies or radio frequency channels;
certificate of formation of identification call signs.

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.

How does a signal jammer work?

The device does not weaken the signal, but creates interference at the selected frequency - intense white noise. As a result, devices within range stop receiving and transmitting data.

In any model, you can select a voltage-controlled generator, an interference source, a tuning circuit, an amplification unit and a transmitting antenna. The size of such a device ranges from a matchbox to a banana box, depending on power, range, functionality and price.

Which signal to jam depends on the type of device and supported frequencies. Modern gadgets usually work with GSM, Wi-Fi, Bluetooth, GPS, GLONASS and FM.

High-tech vendetta

“Ultimate option” for those who want to send their neighbor to 1989. The signal suppressor will leave the enemy without the Internet and mobile communications - it will simply “kill” all frequencies. No more “crazy talk” at full volume and no more heated conversations with “Kents on Skype”.

You can order a jammer on the Internet (we don’t provide links), but remember: this is fraught with consequences. Firstly, the device must be registered, otherwise there will be a fine. Secondly, if the victim proves that you caused him harm with your gadget, you will be held accountable according to the law. Well, there are no guarantees that a neighbor, out of grief, will not take out of the closet a five-string out-of-tune guitar that has been collecting dust since the day of demobilization. And then he will smash it on your head.

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 cellular operators ami since 2010 ) PHS: 1900-1930 MHz (obsolete standard, formerly used in China and Japan)

GPS jammer and anti-tracker

In recent 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.

Jammers provide vehicle anonymity and prevent the collection of personal information via GPS channels.

The devices are capable of successfully combating all kinds of spy technology, which can harm any person in his personal life, in the business sphere, as well as an 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.

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.

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

Now let’s take a closer look at why signal suppression is used in practice at different frequency ranges.

Top best wifi jammers

A homemade jammer is good if you want to take revenge on your neighbor or improve your knowledge of radio electronics. Such devices are unsuitable for serious purposes: their capabilities are too small and their reliability is low. If you need a jammer to protect information, take a look at the signal jammers available on the market.

Let's take a closer look at the most interesting models. Each of them has a maximum range, but in practice it can be much lower. Operation efficiency depends on the location of the routers, wall material and other factors. Note that all models also support blocking of GPS/GLONASS, Bluetooth and GSM/3G/LTE.

EaglePro Metel-Z

An entry-level model that blocks wifi only in the 2.4 GHz range. The power of the device is only 4 W. This is enough to jam the network within a radius of 10 - 15 m.

The main advantage is battery power. One charge is enough for 1.5 hours. You can also work from a 220 V network.

EaglePro Metel-Z

EaglePro Wall

With a power of 19 W, it blocks communication within a radius of 7 to 30 m. The wifi jammer only works at 2.4 GHz. The device is stationary and is powered only from the mains.

Jammer Wall

EaglePro Haze

A portable device capable of jamming communications within a radius of up to 25 m. Supports 2 frequency ranges: 2.4 GHz, as well as 5,725 - 5850 MHz.

Terminator 35-5G

The highest power among portable options is 12 W. The suppression radius is limited to 10 - 30 m. Blocks all ranges used in wifi routers.

The 12,000 mAh battery provides 1 hour of battery life. This is less than previous models, but the high energy consumption is due to the solid power.

The weight of the device is 1 kg. The housing contains 3 fans that protect the jammer from overheating.

EaglePro Tsunami

Stationary frequency suppressor with a power of 42 W. Works in 55 bands, including all popular wifi frequencies. The declared range of action is up to 80 m. In total, the jammer covers 18 frequencies. The advantage over analogues is the fairly low cost in its class - about 30 thousand versus 60 thousand for the Terminator models.

Where are jammers used today – and how?

Today they are mainly purchased by large companies to ensure the confidentiality of information. Jammers are installed in government buildings, Ministry of Internal Affairs and FSB facilities, and in prisons.

Hospitals jam the signal to ensure sensitive electronics work properly. For the same reason, gadgets are purchased for research laboratories and service centers.

Jammers are often installed in cinemas and theaters. They are even available in schools and universities so that no one can copy from the Internet during exams.

They jam not only the signal of mobile phones, but also “bugs” that also work through cellular networks. However, jammers do not protect against recording of conversations (spoiler: there are such devices, read on).

You've probably seen jammers in the subway too. They were installed to combat terrorism. Even if a bomb is planted, a terrorist will not be able to detonate it remotely. The signal won't go through.

Couriers and truck drivers use jammers to prevent their employers from tracking them. For the same reason, car thieves also buy jammers.

Another option is to use a jammer to disable the alarm on a car or building. Or a smart home system in which devices exchange data via Wi-Fi.

There are also jammers - “anti-chanson”. These are radio wave suppressors. Does the music in taxis bother you? Turn it on discreetly in your pocket, and enjoy the silence.

By the way, if you use a player with an FM transmitter together with a jammer, you can force the entire minibus to listen to the right music.

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.

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.

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.

It is much more problematic to create such gadgets due to the presence of a certain processor model.

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Cheap and cruel

The simplest and most cost-effective way. The only parts are a simple battery-powered toy car and a piece of wire that is wound to the wheel. Note: you will need a metal horizontal bar attached to the ceiling. The wire will beat on it, and it will transmit vibration to the apartment above.

After the construction is completed, all that remains is to buy more powerful batteries, rent a hotel room and enjoy a restful sleep. Well, don’t get caught by your neighbors in the elevator, because they will probably want to deal with the resourceful inventor.

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 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

With your own hands

Do-it-yourself radio signal jammer
You can now assemble a device that can jam radio signals yourself. The Internet is literally teeming with schemes on the basis of which you can assemble a radio signal jammer

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How to understand that the signal is being jammed

If the connection goes out for everyone at the same time in a small area, then it is almost certainly a jammer. Inexpensive portable models are effective within a radius of 5-10 meters, industrial ones - up to 300 meters.

It’s more difficult if they jam it from a car, minibus, etc. But the logic is the same. Once you exit, the signal will most likely return.

So, if Wi-Fi suddenly turned off in the office and wireless headphones, mice and keyboards began to malfunction, someone nearby must have turned on the jammer. And if the navigator sent you to Kuala Lumpur or Domodedovo, the government motorcade is traveling nearby.

A reliable way to determine whether a jammer is working right now is a radio signal detector, also known as a field indicator or bug detector. Such a device for 5-10 thousand rubles will allow you to scan a room and find the source of interference.

How to jam your neighbor's wifi

First of all, figure out why you want to block someone else’s wireless network. If your neighbor's wifi is interfering with your router, jamming is not the solution. It will block the wireless Internet not only for your neighbor, but also for you. In such a situation, simply select a different wifi channel on your router.

If you still decide to jam your neighbor’s Internet, use one of the following methods.

Set the router power to maximum

. Before doing this, be sure to select the same channel that your neighbor's wifi is on. The Aircrack-ng program will help you determine the channel. The method is not very effective: at best, the neighbor’s speed will drop, and at worst, he will simply switch to another channel.

The method will also work with an inexpensive wifi adapter for a laptop if you configure it as an access point.

Buy a specialized device

. It works well, but the price starts from 4 - 5 thousand rubles. Whether revenge on a neighbor is worth that kind of money is a debatable question.

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 a regular speaker and looks natural in the interior. It is controlled using a remote control that can be hidden in your pocket.

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 offline and via a network. You can also use the car's cigarette lighter if necessary.

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

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

Device diagram

The jammer circuit includes the following mandatory components - a bipolar transistor, a trimmer capacitor, capacitors, resistors, an inductor and an antenna. The diagram shows a standard medium power receiver. His scheme includes:

VT1 - bipolar transistor;
C1 - tuning capacitor (10 pF);
C2 - capacitor (18-30 pF);
C3 - capacitor (16 pF);
C4 - capacitor (10 pF);
C5 - capacitor (10 pF);
R1 - resistor (5 Ohm);
R2 - resistor (10 Ohm);
R3 - resistor (100 Ohm);
L1 - inductor;
antenna - located between capacitors C3, C5 and C2.

Description of the diagram

Above is the simplest muffler diagram for self-assembly. The device works not only to suppress FM, but also television signals. The device is capable of jamming almost any TV channel at a distance of up to 15 m from the TV (does not work for satellite set-top boxes).

Any types of HF and microwave transistors are suitable for use, for example, KT 368, 325 or 399. If you use microwave transistors, the maximum operating range reaches up to 50 m.

The circuit contains 5-6 turns with a diameter of 0.5 to 0.7 mm, wound on a frame with a diameter of 4 mm. The transmission circuit was replaced to generate interference on the AM and FM bands, since this is where most TV and radio channels operate.

A small piece of 15 cm copper wire is used as an antenna. By rotating the variable capacitor, the device is adjusted to suppress channels that are located in the nearest ranges. The power of the device is enough to suppress 2-3 television or radio channels simultaneously.

Power supply - from 4 to 12 W voltage. For this, crown, corundum or other sources that can provide constant voltage are suitable. The capacitors in the circuit cannot be tilted in different directions even by 1 picofarad, because the device may not work or may stop working altogether.

Recommended current consumption varies from 5 to 7 mA from the crown. Using powerful field-effect transistors, you can suppress both the GPS range and mobile communications.

What is FM jammer

Another name is an FM signal suppressor, which operates over the entire FM broadcast range. The operating frequency varies from 87.5 to 108 MHz. Use at home, in the country or in any other place where receivers can be found. Helps prevent loud music listening by cutting off the receiving frequency. The most effective suppression radius is from 10 to 50 m.

The operating range of the device depends on the quality of the electromagnetic field at the place of use, the proximity of the broadcast sensors, the type of receiving device and the density of buildings (the fewer buildings nearby, the better). Similar schemes were used in the former USSR to jam various transmitters that broadcast prohibited music or programs.