The jammer transmits the signal of the same frequency as the mobile phone and the power is strong enough to allow the two signals to conflict and cancel each other. Since the mobile phone can automatically increase the power when it encounters slight interference, the jammer must be able to recognize the power increase of the mobile phone and increase its power accordingly.The mobile phone is a full-duplex device, which means that it uses two separate frequencies for speech and listening. Some jammers only block one frequency, but they also have the effect of blocking two frequencies at the same time. Since the mobile phone can only receive one frequency at this time, it will mistakenly believe that the mobile phone has no service.
Every year during the college entrance examination, the school will have network problems such as mobile phone disconnection and slow Internet speed. That is because the school has opened a cell phone jammer.If we think of a mobile phone as a handheld two-way radio, the radio can be interfered, and the mobile phone is no exception. Like any radio, the signal of a mobile phone will be interfered.Interfering with mobile phones is like interfering with any other type of radio communication. The mobile phone communicates with its service network through the base station.
When mobile phone users drive down the street, the signal is switched from one base station to another.We know that wireless communication uses electromagnetic waves for communication. The functional characteristics of electromagnetic waves are determined by their frequency.At present, the main principle of signal shielding and signal jamming is to emit huge noise in the frequency band used by mobile phones, which interferes with the reception and transmission of normal signals of mobile phones. This small object is not only often used to prevent cheating in exams, but also politically and militaryly to prevent terrorist attacks. However, signal jammers are not like shopping for food, they are not bought and used casually, otherwise they may be illegal.
Old-fashioned analog phones are as sensitive to interference as today’s digital phones. It’s great to be able to call people at any time.Everyone next to them has to share such private conversations. Who hasn’t experienced it before? Although most people can only grumble and give up, some people go to extremes and retaliate.A mobile phone is essentially a handheld two-way radio communication device. Unfortunately, restaurants, cinemas, concert halls, shopping centers, and churches are all suffering from mobile phones, because not all mobile phone users know when to keep quiet. The speaker and his friends chat about some private topics on their mobile phones.
Like all radio devices, the signal can be blocked or interfered. Interfering with mobile phones is the same as interfering with other types of wireless communications. The mobile phone communicates with its service network through the base station. The base station divides the city into many small areas, called cells. This article will introduce the working principle of cell phone jammer and the legality of their use.When a mobile phone user is driving on the street, the signal is between different base stations transfer.The interfering device emits the same radio frequency as the mobile phone, thereby interfering with the communication between the mobile phone and the base station.
Signal jammer is mainly aimed at various examination rooms, schools, gas stations, churches, courts, libraries, conference centers, theaters, hospitals, governments, finance, prisons, military places and other places where the use of mobile phones is prohibited. To interfere with cell phone signals, all you need is a device that can broadcast on the correct frequency. Although different cellular systems process signals in different ways, the radio signals used by mobile phone networks can be blocked. The GSM network used in digital cellular and PCS systems operates in 900MHz and 1800MHz in Europe and Asia, and 1900MHz (sometimes 1.9GHz) in the United States.
In our daily work, in order to effectively prevent mobile terminal equipment from being brought into secret places, in addition to relying on mobile terminal users to consciously turn in, we may also need to use monitoring equipment such as “mobile phone detection doors” to further monitor entry Whether the personnel in the secret place carry a mobile terminal.Signal jammer is mainly aimed at various examination rooms, schools, gas stations, churches, courts, libraries, conference centers, theaters, hospitals, governments, finance, prisons, military places and other places where the use of mobile phones is prohibited.
This product can eliminate the false alarms of daily metal life items carried by the tested person’s body, and adopts passive passive induction detection method throughout the whole process, and does not cause radiation damage to the tested person and objects.
With high sensitivity and detection accuracy, it is currently the most practical monitoring program to prevent mobile phones from being brought into.In order to ensure the security of classified information, a cell phone jammer should also be placed in the classified area to block the communication of mobile terminals that are intentionally or unintentionally brought into the classified area.It is understood that cell phone signal blockers on the market can limit cell phone signals to 500 meters away from the launching station. The shielding radius is adjustable, and the coverage area reaches more than 30 square meters.
The scanning speed will cause garbled interference in the message signal received by the mobile phone, and the mobile phone cannot detect the normal data sent by the base station, causing the mobile phone to fail to establish a connection with the base station. Mobile phones appear to search the network, no signal, no service system, etc.The mobile phone signal shielding device can only shield mobile phone signals and does not affect other electronic equipment. Save energy, the power is 12W-480W. During operation, the shield scans from the low end to the high end of the forward channel at a certain speed.
According to the above working principle, the mobile phone jammer is generally composed of power supply, electronic scanning control unit, segmented radio frequency module unit, amplifier unit, transmitting antenna unit and other parts. The scanning signal generated by the signal generator passes the inverter, enters the oscillator and modulates it to the mobile communication working frequency band, and then is amplified by the power amplifier and the voltage regulator tube controls the power.
The amplified frequency sweep signal is transmitted into the air in the form of radio waves. Because the frequency sweep signal forms garbled interference in the message signal received by the mobile phone (increasing the proportion of noise and noise signals to the device threshold), the mobile phone cannot receive the normal data sent by the base station, so that the mobile phone cannot establish a normal connection with the base station, thereby causing the mobile phone to disconnect Base station communication network.
The closer the interference location is to the base station, the stronger the field strength and the smaller the effective interference area. , The farther the interference location is from the base station, the weaker the field strength and the larger the effective interference area.The interference power of the cell phone jammer is fixed, and the shielding radius of the unobstructed space is determined by the path attenuation and the signal level of the receiving base station. To realize interference from mobile phone signal jammers to mobile networks, it is necessary to ensure that the signal field emitted by the jammer is stronger than that of the mobile signal in the interference area.
It can be seen that within a certain transmit power, the interference range depends on the field strength in the interference area. No matter how powerful the jammer is, as long as the transmit power is a fixed value, as the distance increases, the interference signal strength will gradually attenuate and lose Interference ability.
The mobile phone signal jammer with built-in antenna is even easier to use. Just plug in the power and turn on the switch.The working principle of mobile communication is that within a certain frequency range, wireless devices (mobile phones, etc.) communicate with the base station through radio waves, and complete data and sound transmission with a certain baud rate and modulation method. Many users who use mobile phone wifi jammer do not understand its working principle, and often exceed the frequency range when using it, resulting in poor use.
Conference room signal shielding device. Many friends will ask me that I don’t want to let the phone call in during a meeting in the meeting room to disturb the progress of the meeting. What should I do at this time? In fact, this situation is very easy to solve, which is to use the special mobile phone signal shielding for Jin Yuda meetings. Many companies will install cell phone jammer in conference rooms. The main reason is that they don’t want the call to interfere with the progress of the meeting.The device will do.When using an external mobile phone signal jammer with antenna, lock the letter on the antenna corresponding to the letter on the host, and then turn on the power.
The mobile phone communicates with the base station through the uplink frequency, and then transfers the signal to the mobile service switching center to realize the call. Once there is a call demand, it will be allocated to the mobile phone service channel according to the specific conditions of the channel near the terminal through the request, so that the mobile phone can jump to the service channel to realize the call and data transmission . At the same time, wireless communication must ensure a sufficient signal-to-noise ratio to effectively receive and complete communication.In the standby state, the mobile phone communicates with the base station through the broadcast control channel.
With the development of science and technology, the positioning, tracking and monitoring of mobile phones have become the most important reconnaissance methods and sources of intelligence in countries around the world. As long as the mobile phone is carried in secret-related places, whether it is used or turned on, it is extremely likely to cause leakage of secrets and cause serious harm to units or individuals, even the party and the state. Only through technical means can cell phone signals be shielded in a small area within the venue area.
Cell phone signal booster is also called mini repeater, also called cell phone companion. From its name, the signal booster knows that its function is to amplify the signal. Amplifiers that specialize in amplifying cell phone signals are called cell phone jammer.Boosters are used to amplify cell phone signals and are mainly used to solve the problem of indoor cell phone signal blind spots.
Installation of the third cell phone signal booster. Generally installed at a distance of more than 2 meters from the ground, the installation location of the equipment and the distance between the indoor and outdoor antennas should use the shortest wiring method (the longer the line, the greater the signal attenuation) in order to achieve the best use effect. Use a repeater as a realization. One of the necessary means for the goal of “small capacity and large coverage” is mainly due to the use of repeaters, one is to ensure network coverage without increasing the number of base stations, and the other is that its cost is much lower than that of a microcellular system with the same effect.
The repeater is a preferred solution to solve the extended coverage capability of the communication network. Compared with base stations, it has the advantages of simple structure, less investment and convenient installation. It can be widely used in blind and weak areas that are difficult to cover, such as shopping malls, hotels, airports, docks, stations, stadiums, entertainment halls, subways, tunnels, Highway, island…
The mobile phone integrates networking, social networking, shopping, entertainment and life. Mobile phones are inseparable from our lives. I suggest you try this method.There are many functions of a mobile phone, but if a mobile phone does not have a network, it is equivalent to a mobile phone without a soul. The network is the key to turn on the mobile phone, so the network and the speed of the network are what we need to pay attention to.We know that the network has a logo, and the quality of the network signal will be reflected on this. However, a lot of people have responded recently, why the network signal is full but the network speed is still very slow? What is the cause? Then we will briefly answer your questions today.
If an attacker uses this interference transmitter, it can be used to block the radio link of the surveillance camera or the window sensor of the alarm system. Alternatively, but also technically more difficult to solve, you can test the signal level, the strength of the radio signal. If a new strong radiation source is detected here, it may be an interfering transmitter.If the connection is interrupted, the cell phone jammer is active.Therefore, a broken connection must always be equivalent to an alarm. In addition, interference can be detected by continuously testing the radio connection between two components using a cable connection.
Recently, many people have reported that the 4G network may be slowed down. Some people even think that this is because the 5G network has arrived. However, more and more 4G network users continue to grow, then these users will gradually share your Internet speed, and the average Internet speed value will drop more and more. Then this state cannot be changed. 4G network users will only increase. But the mobile phone itself has a function that can optimize the network.This is forcing users to use the 5G network, so the 4G speed will be slowed down. However, the truth of the matter is not the case, and the real reason is that more and more users of the 4G network have caused the slowdown of the 4G network.
An attacker can use a jammer to interrupt the radio connection. Suppressing or preventing radio transmission may, for example, interrupt the image of the surveillance camera. These attacks must be considered protection.The cell phone jammer sends a signal of the same frequency (noise or pulse) with a certain strength on a certain frequency, thereby superimposing the original transmission. If jammers are used exclusively, they are called strategic jammers. These devices are also called jammers, and the process is called noise interference.
The jammer can be used in various radio protocols, such as Bluetooth, WiFi, GSM, UMTS, LTE and GPS. Therefore, the specific frequency of the radio protocol is interfered. There are very simple and small devices that can only interfere with radio signals within a limited radius. For example, there is a small adapter for car cigarette lighters that has the function of interfering with GPS signals.
A portable device with a battery can reach a maximum distance of 20 meters under optimal conditions, depending on the model. Usually, they interfere with the signal in the room. Powerful fixed equipment can reach a range of 80 meters.
In Germany, the use of jammers is illegal. They are mainly used by investigative agencies and military departments. Some of them are used in prisons to prevent prisoners from making illegal communications. The challenge here is that no outside signals are blocked, such as mobile phone signals for emergency calls. In foreign countries, jammers are sometimes used in movie theaters and theaters so that the incident will not be interrupted by mobile phone signals. Another use is, for example, to block control signals from drones.
Although the 4G network has been widely covered, I don’t know if you still feel this way. When you use 4G at home, the signal will still be very stuck and slow. Sometimes even 2G jumps to no service, which is just a breakdown.If the signal at home is weak, and the signal outdoors is slightly better, it means that it is caused by the surrounding building environment, and the signal is poor due to environmental factors. This problem can still be solved. A good cell phone jammer is essential. What are the special features of home mobile phone signal jammers? How should we choose? Look down and find out.
The working principle of the mobile phone signal blocker (also known as the cell phone jammer and the cell phone jammer is the scan signal generated by the sawtooth signal generator is inverted by the inverter, and then enters the voltage-controlled oscillator for code division multiple access, GSM It is modulated on the same frequency band as the three downlink frequencies of PHS. The modulated scan signal is amplified by the power amplifier. The power of the power amplifier is controlled by the voltage regulator tube to make the transmission power less than 1W. The amplified scan signal is transmitted in the form of radio waves. In the air.
Because the frequency sweeping signal forms random code interference in the message signal received by the mobile phone, the mobile phone cannot receive the normal data sent by the base station, which prevents the mobile phone from establishing a normal connection with the base station, thereby making the mobile phone separate from the base station communication network.As long as the electromagnetic radiation intensity of qualified products produced by regular manufacturers has been rigorously tested by national authoritative testing and certification agencies, the electromagnetic field intensity measured at all sampling points is lower than the “Electromagnetic Radiation Protection Regulations” stipulated by the State Environmental Protection Administration.
This scanning speed can cause garbled interference in the message signal received by the mobile phone, and the mobile phone cannot detect the normal data sent from the base station, so that the mobile phone cannot establish a connection with the base station. The mobile phone is manifested as the phenomenon of searching the network, mobile phone no signal, no service system, etc.The cell phone jammer scans from the low end frequency of the forward channel to the high end at a certain speed during operation. The cell phone jammer scans from the low end frequency of the forward channel to the high end at a certain speed during operation.
This scanning speed can cause garbled interference in the message signal received by the mobile phone, and the mobile phone cannot detect the normal data sent from the base station, so that the mobile phone cannot establish a connection with the base station. The mobile phone is manifested as the phenomenon of searching the network, mobile phone no signal, no service system, etc. Whether there is any obstruction between the jammer and the wireless communication equipment. The interference signal emitted by the jammer will be attenuated to different degrees after passing through the obstruction, please try to prevent it.Indoor-type shielding device is recommended to be placed at a height of about 180cm-220cm from the ground, and the angle is preferably forward.
Choose different places to use different models and models from the purpose. If they are used in the prison detention center military area, they require 365 days of continuous use. In this way, choose a shield with better heat dissipation and stable performance. The choice of different venues is also different.The weaker the wireless communication signal strength in the use environment, the stronger the theoretical shielding effect of the shield.The farther the shielding environment is from the base station, the stronger the theoretical shielding effect of the shielding device.