All of the above refers to one device, the purpose of which is to interfere with the radio channel. Other equipment, which operates on a jammed frequency, stops transmitting and receiving signals within the range of the jammer. Why is it needed and how to choose a radio jammer?
Jammer is a device that is used to create radio interference and thereby prevent the normal operation of any radio communication devices. Cell phone jammer creates interference at the frequency on which modern cell phones operate. Thus, this device interferes with the transmission of the signal from the mobile tower to the phone. Moreover, according to one of the largest manufacturers of jammer in the world, the company Jammer-store, more effective, in terms of minimizing energy consumption, is the interruption of the signal from the cell phone tower to the phone, but not from the cell phone to the tower, because the signal from the tower is not as strong, because the tower is at a fairly great distance, and it is easier to block. Usually, such devices are used in places where telephone conversations are inappropriate and will be distracting.
History of the Jammer
The rapid spread of mobile technology in the early 21st century has led to issues such as privacy interference, industrial espionage, and many others. In addition, there was a growing public dissatisfaction with making phone calls in transportation, restaurants, cafes, theaters, and other public places. While the old cell phones were not networked everywhere, the newer models could be used almost everywhere. Cell phone jammers are a cheaper alternative to anti-cell phone tools such as the Faraday cage. Jammer’s were originally developed solely for use by the military and law enforcement against criminals. Some devices were specifically designed to prevent the use of radio-controlled bombs. Over time, companies that initially produced jammers exclusively for government contracting began to sell jammers freely in response to the demand for these devices among the civilian population. Since then, the demand for this product has grown slowly but steadily, especially in the most densely populated regions.
The principle of jammer action
The cell phone jammer blocks cellular phones by creating radio waves on the frequency used by modern mobile operators. This causes interference in the connection between the phone and the cell phone tower, resulting in a loss of signal from the network. Most cell phones use two different frequencies to acquist and receive signals from the cell phone tower (so-called two-way transmission). It is sufficient to interrupt either of these signals to put the phone out of service. Portable jammer models can block phones up to 30 meters away, while the range of stationary models can exceed several kilometers.
Used inside or outside the premises:
Internal jammers are installed in the office, server room, and meeting room – the room where confidential information is handled. A typical place of installation – is under the suspended ceiling, the lower part of the table top. Switched on remotely with a key fob, a separately derived button, or a timer. The range is limited to the room. Devices help jam the signal during negotiations, a meeting of distinguished guests, and an attack on the premises.
External jammers are installed on the roof of the building. If the radio signal suppressor has a separate antenna, it is placed in an external switching cabinet. Due to the high power, the device creates a protective radio dome around the building and suppresses signals in the rooms and at some distance from the building. The latter saves it from spy drones and quadcopters. Being in the field of action of the jammer, the devices lose contact with the operator and, depending on the model, fall, lose their orientation, land on the nearest surface, or return to the point of takeoff.
Such devices are carried by the person in order to secure the surrounding space at a small distance: on negotiations in a cafe, stranger’s office, or temporary transport. In comparison with stationary jammers such jammers are less powerful, they are battery-operated.
Criteria for choosing jammers: two universal indicators
Stationary and mobile jammers are chosen according to the same criteria. The only difference is that for mobile jammers you should pay attention to the characteristics of the battery. On it depends the duration of operation of the device.
The criteria for selecting jammers are:
- Power of the outgoing signalThe parameter affects the range of the device. As a rule, the jammer for 40 W works within a radius of 40 m, but this is a relative indicator. The closer it is situated to the mobile cells and the more radioactive devices are around, the less the range is. For example, in a clear field, the range of a 30 W radio signal suppressor will be 150 – 200 m. In a city, this parameter is reduced to 20 m.Wearable devices have a power of 4 W, stationary – from 10 W. This is the total figure for all the channels that the signal suppressor covers. Power of one channel will be significantly lower.
- Suppression bands or channelsInitial models have capacity of 3 – 6 bands and suppress main mobile channels: SDMA, GSM, 4G, sometimes 5G. The older models cover up to 36 bands and additionally block Wi-Fi, Bluetooth, GPS channels. They also suppress signals from alarm key fobs, remote controls, intercom radios and other devices with a radio frequency range of 433 – 860 MHz.
Accordingly, the more powerful the device, the more bandwidth, the more expensive it is.
When a jammer is indispensable
Radio signal suppressor works in two ways: it prevents devices from transmitting information and blocks its reception. When is it important? GSM jammers – 3G 4G portable jammers and cell phone blockers – Jammer Store – https://www.jammer-store.com/gsm-blockers-jammers/
Blocking outgoing signals
A jammer is needed if:
- people come to the negotiations who are not worthy of being searched or who do not allow themselves to be searched for radio-transmitting devices;
- People come to meeting with cell phones that are set up to transmit information. The owner may not be aware of this. For example, a Trojan program has infiltrated the device. At a certain moment it activates and starts transmitting information via cellular networks or the Internet. When the radio signal suppressor is on, the program will not be able to transmit anything. Another plus – cell phones will not ring and distract during the meeting;
- There are stationary bugs in the room or in the next room is a transmitting device. With a jammer you can block any spy radio devices, even without knowing their type and characteristics. Just turn the device on as you are in the place and nothing will get into the radio air;
- cars have magnetic bugs, and bookmarks that you don’t know about. Activate the radio signal suppressor and the car won’t be bugged, and won’t be tracked by GPS.
Incoming signal jamming
Jammer jams the incoming signal to spyware devices. It is usually a signal to the device to activate. You can check a room, or a car and find nothing suspicious. As long as the device is “asleep”, it will not give itself away. To activate, it receives an external radio signal, which is easily blocked by the radio signal suppressor.
For example, if a bomb is placed under the gas tank of a car, it cannot be detected by technical means. Only with the help of inspection mirrors or trained dogs, if explosives are used. At the right moment, the intruder sends a signal over the phone or via remote control – and the bomb explodes. Similarly, some GSM bugs and stationary bugs are turned on to transmit information only after receiving a command from the outside. A radio signal suppressor eliminates this problem.