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Answer: General cell phone signal blockers will not cause harm to human health.

First of all, radiation is generally divided into two types. One is high-energy ionizing radiation, such as X-ray machines or nuclear radiation in hospitals. Ionizing radiation is more harmful to the human body, but it is less exposed in daily life; the other is non-ionizing radiation. The most common electromagnetic radiation generated by general electrical appliances in life belongs to non-ionizing radiation. For example, microwave ovens, refrigerators, and the radiation generated by mobile phones and computers that people use every day is electromagnetic radiation.

Cell phone signal blockers emit a kind of electromagnetic radiation, and the energy of the electromagnetic radiation emitted is also relatively low, so it can be determined that general cell phone signal blockers will not cause harm to human health. When choosing a cell phone signal blocker, it is recommended to choose a qualified regular manufacturer, such as the cell phone signal blockers produced by Nanjing Baikang Electromechanical Technology Co., Ltd., which have been tested by national authoritative units, meet national standards, and do not cause harm to the human body. You can use them with confidence.

There is no need to avoid the radiation hazard of cell phone signal blockers. Like cell phones,cell phone signal blockers do have certain radiation.

The working principle of cell phone signal blockers is similar to that of cell phones. For example, the chip it uses is the same as that ofcell phones, and it also emits electromagnetic signals. Therefore, like cell phones, it will also produce certain radiation to the human body. Will all intensities of electromagnetic radiation endanger human health? The degree of harm to the human body caused by cell phone signal blockers cannot be cut off in one size fits all. It is related to the length of time the instrument is turned on and the individual's physical condition. In fact, the national safety value of electromagnetic radiation intensity (i.e. field strength) is clearly stipulated.

The national regulations mentioned here are the "Electromagnetic Radiation Protection Regulations" (GB8702-88) approved by the State Environmental Protection Administration on March 11, 1988 and implemented on June 1 of the same year. The regulations stipulate the safety values ​​of electromagnetic radiation exposure for both occupational and public groups. For the public, for electromagnetic radiation with a frequency range of 30-3000MHz, the average field strength cannot be greater than 0.4 watts/square meter in any continuous 6 minutes in 24 hours a day.

Formal companies with production licenses have all produced cell phone jammers that have been inspected by relevant departments, and the radiation intensity is within the safety range specified by the state. Generally,cell phone signal jammers suitable for smaller spaces such as classrooms and conference rooms are not large in power, and there are strict regulations on the installation location. For example, on the wall behind the classroom corridor and the podium, the distance from the human body is usually more than 2-3 meters, which has reduced the harm of electromagnetic radiation to the human body to the safety value range. For small spaces, you must not blindly introduce high-power jammers (shielding range greater than 50M radius) for laziness and saving. "The electromagnetic field strength of high-power cell phone signal jammers is also strong, and a longer distance is required to enter the safe range.

The practice of making a one-size-fits-all judgment on the degree of harm of jammers has made regular jammer manufacturers quite indignant. Radiation and harm to the human body are two different things, how can they be equated? Just like cell phones, microwave ovens, and televisions all have radiation, and some of the field strengths are quite strong, but outside a certain range and within a certain period of time, this harm can be ignored and will not cause irreparable damage to the human body. Therefore, these products are widely used in society and have not been abandoned.

Mobile phone jammers can not only interfere with mobile phone signals, but also interfere with radio signals in other frequency bands by adding interference modules of different bands. Everyone knows that radio signals can achieve different functions according to the different frequencies used, including GPS, WiFi, etc. Because of the differences in radio technology and standards, as well as the differences in signal strength emitted by the signal transmitter of the radio signal, the interference range of mobile phone jammers will be different when interfering with these radio signals.

At present, the signal frequency that can be used by domestic mobile phones ranges from 700M to about 6000M, including signals from mobile phone operators, WiFi signals, GPS signals, etc. According to the different types of signals, they are divided into various uses, and the functions achieved are also different.

The interference range of mobile phone jammers for mobile phone signals of different frequency bands is also different. In the same test environment, the strength of mobile phone signals of each frequency band cannot be the same. However, mobile phones can receive mobile phone signals of multiple frequency bands at the same time according to different operators to ensure that the mobile phone can be used normally. At this time, it is necessary to test the frequency band of the strongest mobile phone signal on site, and then adjust the mobile phone jammer or adjust the signal source, and then cover the mobile phone frequency band with the strongest signal on site. Then, it can be basically determined that this mobile phone jammer can interfere with the ability of all mobile phone signals on site.

In certain cases, the above solutions are relatively expensive. In order to save costs and pursue higher cost-effectiveness, the following solutions can be considered

Find the stronger frequency bands on site, and then equip high-power interference modules to carry out targeted interference on these strong signal frequency bands, so as to reduce costs and achieve the purpose of interference effect.

As the name suggests, the cell phone signal jammer is a professional device that can interfere with mobile phone signals. It is used in many places, such as school examination rooms, libraries, courts and hospitals, etc. So how to use the jammer better? Here is a brief introduction.

The use of the mobile phone signal jammer is relatively simple. First, select an area where the mobile phone signal needs to be interfered, and then place the jammer in a suitable position in this area, which can be on the wall or on the desktop; then you can connect the power supply to conduct a pre-installation test, and after the test is completed, you can install it. It can be fixed on the wall or placed in the ceiling. After installation, it can be powered on and used; at this time, all mobile phones on the scene are in the network state of searching, and it has lost the signal of the base station. Whether it is the caller or the called party, it cannot establish a call connection.

The interference range of the mobile phone signal jammer is mainly related to the electromagnetic signal field strength at the site of use, and also to the distance from the site of use to the communication base station. If there is no base station within 300 meters around the site, the interference range will be larger and the interference effect will be better.

Some friends are worried that the radiation from mobile phone signal jammers is harmful to the human body. In fact, any electronic product will generate some electromagnetic radiation to a greater or lesser extent. The country has strict national standards for electromagnetic radiation. As long as the radiation value of the equipment is below the national standard, it can be determined that the electromagnetic radiation generated by the equipment is safe and harmless to the human body. The radiation value generated by mobile phone signal jammers is lower than the national standard, and the human body is not exposed to electromagnetic radiation at close range for a long time, so it is not harmful to the human body. It can be said that there is almost no harm.

The above is about the use of cell phone signal jammers and the issues that the public is more concerned about. When using the jammer, you can follow the above method to operate. You only need to install and connect it, plug in the power supply and you can use it. When using it, you also need to choose a suitable location so that you can achieve a better interference effect.

There is no need to worry about radiation hazards when using cell phone jammers. Like mobile phones, the signals emitted by mobile phone jammers do have certain electromagnetic radiation. The working principle of the jammer is similar to that of mobile phones. For example, the chip it uses is the same as that of mobile phones, and it also emits electromagnetic signals. Therefore, it will also generate certain electromagnetic radiation like mobile phones.

Will all intensities of electromagnetic radiation harm human health? The degree of harm to the human body caused by mobile phone jammers cannot be cut off in one size fits all. It is related to the length of time the machine is turned on and personal physique. In fact, the national safety value of electromagnetic radiation intensity also has national standards. The national standard mentioned here is the public exposure derived limit of the "Electromagnetic Environment Control Limits" (GB8702-2014) updated by the State Environmental Protection Administration in 2014. This national standard stipulates the maximum limit of the safety value of electromagnetic radiation exposure, and the average value of the electromagnetic radiation exposure field strength of the public cannot be greater than 0.4W/㎡.

The mobile phone jammers produced by regular companies with production licenses are strictly tested by the environmental testing department, and the radiation intensity is below the maximum limit specified in the "Electromagnetic Environment Control Limits" (GB8702-2014). In this way, it can be understood that the radiation value of the mobile phone jammers produced is safe for the human body.

The transmission power of mobile phone signal jammers suitable for smaller spaces such as classrooms, examination rooms, and conference rooms is relatively small, and there are strict regulations on the installation location and installation height. For example, above the blackboard in the classroom and on the wall of the conference room, the straight-line distance from the cell phone signal jammer to the human body is usually more than 2 meters, which has reduced the harm of the electromagnetic radiation of the mobile phone signal jammer to the human body to below the safe value.

For high-power mobile phone jammers with a transmission power of more than 50W for the interference module, the electromagnetic radiation value is relatively high. When in use, a farther distance is required to enter the safe range of electromagnetic radiation.

Low-power cell phone signal jammers are commonly used for indoor mobile phone signal shielding under normal circumstances. High-power mobile phone jammers are basically used outdoors, and only a small number are used indoors. They are mainly used to solve the problem of large indoor areas and relatively transparent environments. High-power cell phone jammers are used indoors.

When low-power mobile phone signal jammers are used outdoors, the most important thing is to pay attention to rain protection. At this time, after the signal jammer is installed, a canopy should be installed above the mobile phone jammer. Generally, the edge of the canopy is required to exceed the mobile phone signal jammer by about 20 cm, and when installing the canopy, the two sides of the canopy should also exceed the jammer by about 15 cm, so as to effectively prevent rain from splashing into the ventilation shutters of the cooling fan. Also pay attention to waterproofing the power supply line of the signal jammer so that it can be used normally. At the same time, it is necessary to regularly check whether the mobile phone signal jammer is faulty.

The chassis of the high-power mobile phone signal jammer has been designed to be waterproof before leaving the factory. There is no need to worry about rain splashing into the chassis during normal rainfall. You only need to pay attention to the installation height of the mobile phone signal jammer host. It must meet the requirements of the on-site installation environment and be higher than the highest historical water level at the location. When the high-power jammer is used outdoors, it is necessary not only to pay attention to rain protection, but also to lightning protection when necessary. The lightning protection method is to weld the lightning rod to the antenna bracket, and then insert a steel chisel about 2 meters long into the ground, and weld one end of the steel chisel to the antenna bracket or lightning rod with steel wire, or connect it to the lightning protection net on the roof. Of course, the connector of the power supply line of the high-power jammer should also be waterproofed.

Nowadays, mobile phone signal jammers are installed in almost every examination room to prevent candidates from cheating with their mobile phones during the examination. Those who are more careful will find that the jammer will be very hot after being turned on and used for a period of time. Everyone knows that electronic products will generate some heat more or less when in use. If the machine is not cooled, it will affect the normal use of the machine. In severe cases, it will cause irreparable damage to the equipment.

This is enough to show that heat dissipation is very important for mobile phone signal jammers. In order to better achieve the interference effect, manufacturers have also tried their best to dissipate the heat of the jammer. At present, major manufacturers have basically two points for the heat dissipation of jammers, natural heat dissipation or adding a cooling fan. The natural heat dissipation method is more common in outdoor machines. The heat is dissipated into the atmosphere through the large area of ​​the heat dissipation fins on the outer shell of the equipment. If there is wind, the heat dissipation effect of the jammer will be better. Of course, this is also a big test for the performance indicators of various components inside the machine. Therefore, major manufacturers will choose devices with good performance and small temperature rise, but the cost is relatively high, so they are generally used in high-power machines. Another method is to use a cooling fan to assist in heat dissipation. The machine generates heat, and the cooling fan assists in cooling the radiator to dissipate the heat as quickly as possible. This minimizes the impact of the temperature increase on the device. Machines that use cooling fans to assist in heat dissipation are mostly small-power mobile phone signal jammers. Of course, for special models, cooling fans will also be used to assist in heat dissipation of the jammer, such as trolley-type and backpack jammers.

Cell phone jammers can not only interfere with mobile phone signals, but also interfere with radio signals in other frequency bands by adding interference modules of different bands. Everyone knows that radio signals can achieve different functions according to the different frequencies used, including GPS, WiFi, etc. Because of the differences in radio technology and standards, as well as the differences in signal strength emitted by the signal transmitter of the radio signal, the interference range of cell phone jammers will be different when interfering with these radio signals.

At present, the signal frequency that can be used by domestic mobile phones ranges from 700M to about 6000M, including signals from mobile phone operators, WiFi signals, GPS signals, etc. According to the different types of signals, they are divided into various uses, and the functions achieved are also different.

The interference range of mobile phone jammers for mobile phone signals of different frequency bands is also different. In the same test environment, the mobile phone signal strength of each frequency band cannot be the same. However, mobile phones can receive mobile phone signals of multiple frequency bands at the same time according to different operators to ensure that the mobile phone can be used normally. At this time, it is necessary to test the frequency band of the strongest mobile phone signal on the scene, and then adjust the cell phone jammer or adjust the signal source, and then cover the mobile phone frequency band with the strongest signal on the scene. Then, it can be basically determined that the mobile phone jammer can interfere with the ability of all mobile phone signals on the scene.

In certain cases, the above solutions are relatively expensive. In order to save costs and pursue higher cost-effectiveness, the following solutions can be considered

Test the relatively strong frequency bands on the scene, and then equip high-power interference modules to carry out targeted interference on these strong signal frequency bands, thereby reducing costs and achieving the purpose of interference effect.

Customers often ask in what kind of environment can the effect of the cell phone signal jammer be maximized? Why do mobile phone signal jammers not work well in some places, or the shielding effect is relatively poor? In fact, this is closely related to the electromagnetic environment around the place where the jammer is used. So in what environment will the shielding effect be relatively poor?

1. The environment where the mobile phone signal jammer is used is not transparent, there are many compartments, or walls are blocked. This is because the penetration of wireless signals is relatively poor, which depends on the frequency of the transmitted signal. The higher the frequency, the worse the penetration, or diffraction performance.

2. The place where the jammer is used is close to the base station. The mobile phone signal will be relatively strong in places close to the base station. If the jammer wants to shield the mobile phone signal, the signal strength of the emitted signal must be stronger than the mobile phone signal on site, so that the mobile phone signal can be shielded.

3. There is an indoor signal distribution system in the building where the mobile phone signal jammer is used, commonly known as a mobile phone signal amplifier. The place with a mobile phone signal amplifier is similar to the place close to the base station. If you want to shield the mobile phone signal, the jammer needs to have a larger transmission power.

When using a mobile phone signal jammer, you need to pay attention to the distribution of base stations around the site of use and confirm whether there is an indoor signal distribution system in the building. If there are too many compartments, multiple jammers are needed to cooperate with the shielding. If the base station is close, you can coordinate with the operator to adjust the direction of the base station antenna plate, so that the mobile phone signal strength at the site can be reduced, thereby improving the shielding effect of the jammer. In an environment with an indoor signal distribution system, when using the jammer, let the user turn off the power of the indoor signal distribution system to reduce the signal strength, which can improve the effect of the jammer to a certain extent.

When using the cell phone jammer, the most basic requirement for the use environment is to have a stable power supply. The most common one is AC 220V mains electricity. Different types of mobile phone jammers can be selected for different use environments. For outdoor use, it is recommended to use a mobile phone jammer with good waterproof performance and fully enclosed shell. In places such as chemical plants or oil depots at gas stations, explosion-proof cell phone jammers are required. For indoor use, only a stable and reliable power supply is required.

Of course, some units have their own control platforms or control modules. When the cell phone jammer needs to be uniformly controlled through the control platform, the mobile phone jammer can be connected to the control module. As long as the control module can control the on and off of the power supply through a relay or PLC, the control platform can be used to control the mobile phone jammer. However, it is recommended that when using the control platform to control the mobile phone jammer, do not frequently control the on and off of the power supply of the mobile phone jammer, which will affect the service life of the cell phone jammer and increase the maintenance cost. The cell phone jammer is used for a long time and is not afraid of long-term continuous use.