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A simple device for several thousand rubles can neutralize burglar alarms or disable cellular communications in an entire office.
If you live in USA, then you meet with this regularly in the city center.
Jammers can be easily bought on the Internet, but they should only be used with the permission of Roskomnadzor. More information about the registration process of radio frequency suppressors can be found in the document Registration of RES and VChU.
1. Stationary jammers.
These devices are designed for permanent use in one location and require a network connection to function. They weigh several kilograms and can simultaneously generate "white noise" on ten or more radio frequency bands;
2. Portable jammers.
These 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;
3. Covers-blockers.
Since the 90s, many legends have been circulating about the "police mode" built into every GSM phone, which allows a cellular operator to track movements and listen to conversations of any subscriber.
These cases usually have two compartments. The first compartment is designed to completely block signals, and the second to protect against harmful radiation.
In many countries around the world, high-ranking officials and intelligence officers use specially assembled mobile phones. In USA, crypto telephones SMP-ATLAS / 2 and M-549M are issued for employees of secret departments.
And now let's dwell in more detail on what the suppression of signals at different frequency ranges is used for in practice.
In most cases, cell phone jammers are purchased to protect premises from eavesdropping using GSM bugs. The jammer can create silence in the hall at a mass event by blocking incoming calls.
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 since 2010);
PHS: 1900-1930 MHz (legacy standard, previously used in China and Japan).
Such jammers are often combined in one device with cell 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 covert surveillance cameras, routers, wireless keyboards and mice do not work.
Frequency range:
Wi-Fi / Bluetooth: 2400 - 2500 MHz.
Truckers 'and couriers' service vehicles are equipped with GPS beacons that allow the employer to monitor the employee's location. But you can protect yourself from such surveillance using an anti-tracker.
GPS anti-tracker is a small device that is installed in the 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 hijackers to protect against tracking a stolen vehicle.
Frequency ranges:
GPS L1: 1570-1620 MHz;
GPS and GLONASS L2: 1200-1310MHz;
GPS and GLONASS L3: 1380-1410MHz.
In online stores they are sold under the life name "Antishanson". Such jammers will be useful in minibuses, taxis, shops and other habitats of the listeners of Radio Dacha and Retro FM.
Frequency range:
FM: 88-108MHz.
Also, MP3 players with FM transmitters are used to counter chanson and trolling of drivers. With their help, you can not just drown out the radio, but make the entire minibus listen to your favorite tracks.
Microphone jammers are included in the comprehensive anti-eavesdropping kit along with cellular jammers 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 recorders;
Acoustic suppression. The device generates human-audible “chorus of voices” interference.
"Microphone jammer" usually weighs several kilograms, looks like an ordinary speaker and looks organically in the interior. It is controlled by a remote control that can be hidden in your pocket.
To suppress radio signals imperceptibly to others, jammers are sold in online stores, camouflaged for various objects. Portable jammers with a range of up to 15 meters disguise themselves as purses or packs of cigarettes, and more powerful universal jammers for briefcases, diplomats or interior details.
The ideal option is to purchase a field indicator (radio signal detector) and walk with it through the area where communication failures are observed. You can buy it at a price of $ 50 to 300.
Field indicators are sold in online stores under the name "bug detector". The household field indicator detects any devices.
If you live in USA, then you meet with this regularly in the city center.
Jammers can be easily bought on the Internet, but they should only be used with the permission of Roskomnadzor. More information about the registration process of radio frequency suppressors can be found in the document Registration of RES and VChU.
How do RF jammers work?
The general principle of operation of all jammers is very simple: they emit a signal in the same frequency range as the device to be jammed. A "white noise" field is created around the jammer, in which signals from other sources are lost.Types of jammers by form factor
1. Stationary jammers.
These devices are designed for permanent use in one location and require a network connection to function. They weigh several kilograms and can simultaneously generate "white noise" on ten or more radio frequency bands;
2. Portable jammers.
These 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;
3. Covers-blockers.
Since the 90s, many legends have been circulating about the "police mode" built into every GSM phone, which allows a cellular operator to track movements and listen to conversations of any subscriber.
These cases usually have two compartments. The first compartment is designed to completely block signals, and the second to protect against harmful radiation.
In many countries around the world, high-ranking officials and intelligence officers use specially assembled mobile phones. In USA, crypto telephones SMP-ATLAS / 2 and M-549M are issued for employees of secret departments.
And now let's dwell in more detail on what the suppression of signals at different frequency ranges is used for in practice.
Cellular
In most cases, cell phone jammers are purchased to protect premises from eavesdropping using GSM bugs. The jammer can create silence in the hall at a mass event by blocking incoming calls.
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 since 2010);
PHS: 1900-1930 MHz (legacy standard, previously used in China and Japan).
Wi-Fi / Bluetooth
Such jammers are often combined in one device with cell 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 covert surveillance cameras, routers, wireless keyboards and mice do not work.
Frequency range:
Wi-Fi / Bluetooth: 2400 - 2500 MHz.
GPS / GLONASS
Truckers 'and couriers' service vehicles are equipped with GPS beacons that allow the employer to monitor the employee's location. But you can protect yourself from such surveillance using an anti-tracker.
GPS anti-tracker is a small device that is installed in the 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 hijackers to protect against tracking a stolen vehicle.
Frequency ranges:
GPS L1: 1570-1620 MHz;
GPS and GLONASS L2: 1200-1310MHz;
GPS and GLONASS L3: 1380-1410MHz.
Radio
In online stores they are sold under the life name "Antishanson". Such jammers will be useful in minibuses, taxis, shops and other habitats of the listeners of Radio Dacha and Retro FM.
Frequency range:
FM: 88-108MHz.
Also, MP3 players with FM transmitters are used to counter chanson and trolling of drivers. With their help, you can not just drown out the radio, but make the entire minibus listen to your favorite tracks.
Audio recording
Microphone jammers are included in the comprehensive anti-eavesdropping kit along with cellular jammers 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 recorders;
Acoustic suppression. The device generates human-audible “chorus of voices” interference.
"Microphone jammer" usually weighs several kilograms, looks like an ordinary speaker and looks organically in the interior. It is controlled by a remote control that can be hidden in your pocket.
How do jammers mask?
To suppress radio signals imperceptibly to others, jammers are sold in online stores, camouflaged for various objects. Portable jammers with a range of up to 15 meters disguise themselves as purses or packs of cigarettes, and more powerful universal jammers for briefcases, diplomats or interior details.
And the last thing. How to find a jammer?
The ideal option is to purchase a field indicator (radio signal detector) and walk with it through the area where communication failures are observed. You can buy it at a price of $ 50 to 300.
Field indicators are sold in online stores under the name "bug detector". The household field indicator detects any devices.
