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Mobile phone signal jammers are mainly used in various examination rooms, schools, gas stations, churches, courts, libraries, conference centers (rooms), theaters, hospitals, governments, finance, prisons, public security, military areas and other places where the use of mobile phones is prohibited. It is understood that the cell phone signal jammers currently on the market can limit mobile phone signals that are 500M meters away from the transmitting station and have a radius of >20 meters. The shielding radius is adjustable, it only blocks mobile phone signals and does not affect other electronic devices. Save electricity, power is 20W--480w.

When a mobile phone works, it operates within a certain frequency range. The mobile phone and the base station are connected through radio waves to complete the transmission of data and sound at a certain baud rate and modulation method. In view of this communication principle, the mobile phone signal jammer scans from the low-end frequency of the forward channel to the high-end at a certain speed during the working process. This scanning speed can cause garbled interference in the message signals received by the mobile phone. The mobile phone cannot detect normal data sent from the base station, making it impossible for the mobile phone to establish a connection with the base station. Mobile phones show symptoms such as searching the network, no signal, and no service system.

Common signal jammers for sale on the market have operating frequencies: 869~894MHz; 825~960MHz; 1805~1880MHz and 1900~1990MHz, etc. The applicable frequency bands are CDMA800, GSM900, DCS1800, and PCS1900. It can control a range of about 40 meters in diameter, using a DC-DC converter input voltage and 5V output voltage.

basic skills:

1.Slow start function

After the shield is powered on, the working power rises from zero to stable within 4 seconds.

2.shielding function

After activation is completed, mobile phones within the range will be blocked within 35 seconds.

Basic performance:

Transmission frequency range: 860-960MHZ 1.800-1.990GHZ

Transmitting power: 1W±200mA

Ambient temperature: -20-+55℃

Relative humidity: 30-95%

Functional frequency bands: CDMA800, GSM900, DCS1800, PCS1900, PHS.

Control range: about 40 meters.

1. Select the area where you need to cut off the cell phone signal and place the cutter on the table or wall in this area.

2. After installation is complete, turn on the power to the disconnector and turn on the power switch.

3. After the equipment is connected, press the power switch disconnector to work. At this time, all powered mobile phones on site are in the search network state and lose the base station signal. Neither the calling party nor the called party can establish a call connection.

Mobile phone signal jammers have become standard equipment in examination rooms. Not only for high school and college entrance examinations, but also for postgraduate examinations, civil service examinations and various qualification certificate examinations, cell phone jammers are needed to prevent candidates from contacting the outside world through wireless signals. In the examination room where Dazhan Electronics' mobile phone signal jammer is used, various mobile phone signals (2345G), wireless intercom signals, Bluetooth WiFi signals, etc. will be blocked by interference.

So let’s talk about mobile phone signal jammers. Why can they interfere with your mobile phone signal?

We can temporarily compare a mobile phone to a radio. The radio often buzzes or the channel is simply messed up and cannot be heard. This means that the signal is interfered. Since the radio can be interfered, the same can be said for the mobile phone, which can be naturally and interference through some devices.

Mobile phone signal jammers have many different names, jammer, mobile phone jammer, signal jammer for sale, mobile phone signal jammer, mobile phone signal blocker, mobile phone isolator, mobile phone interceptor, mobile communication signal jammer, mobile phone signal leveler Shielding device, mobile phone jammer, signal jammer, mobile phone blocker, signal blocker, mobile phone signal isolator, signal isolator, mobile phone signal cutter, radio signal jammer.

It uses frequency multiplication, frequency division, frequency hopping filtering and other technologies to analyze the required shielding frequency for the uplink and downlink channels of the mobile phone system; it customizes a spherical shielding space according to the power of the shielder, and automatically forms a shielding magnetic field within the specified range. Make mobile phones (including PHS - PHS, GSM - China Unicom, China Mobile, CDMA - China Telecom) invalid in this space. When the jammer is in working condition, it can disable the signal sending and receiving functions of mobile phones within the specified range, making it impossible to make outgoing and incoming calls, thereby achieving the purpose of mandatory disabling.

The principle of radio communication: Within a certain frequency range, mobile phones and base stations are connected through radio electromagnetic waves, and data and sound transmission are completed with a certain baud rate and modulation method.

The communication principle of the mobile phone signal jammer is that the jammer scans from the low-end frequency to the high-end frequency of the forward channel at a certain speed during the working process. This scanning speed can cause garbled interference in the message signals received by the mobile phone. The mobile phone cannot detect normal data sent from the base station, making it impossible for the mobile phone to establish a connection with the base station. Mobile phones show symptoms such as searching the network, no signal, and no service system.

Since we know that the communication method of wireless communication is to use electromagnetic waves to communicate.

The functional properties of electromagnetic waves are determined by their frequency.

Different communication systems use different frequencies so that everyone can live in peace and not interfere with each other. The basic principle of cell phone jamming devices is to emit the same radio frequency signals as cell phones. Because the frequencies are the same, mobile phones cannot tell which signal is a regular base station signal, thus achieving "interference". As long as there is a machine on the same frequency as the phone, it will make a lot of "noise" when the base station tries to connect to the phone. You will find that the signal from the phone is unrecognizable, so you will refuse to communicate with the phone.

In the early days, jammers only blocked one set of frequencies, such as 2G, while complex jammers could block several types of networks at the same time, such as 2-3-4-5G. So how is this multi-network interference achieved?

It's actually simple. That is to say, the interference bands corresponding to these three signals are repeated in a cyclic manner, covering these three interference bands at the same time. The intervals of this cycle are so small that the mobile phone has no chance to speak and can only sit down and do it quietly. A brick.

It covers 2/3/4/5G, but what about Bluetooth and wifi? It doesn’t matter, it can be easily handled as well.

The jammer has evolved again, adding Bluetooth and WiFi frequency bands to the scanning range, so that several common communication methods in society are completely covered.

Many people do not understand the differences between Bluetooth, Wi-Fi and mobile data. They seem to be wireless communication technologies. In fact, the main difference between them is the frequency band. In mobile communication technology, 2G mainly works in the 900-1700MHz frequency band, 3G works in the 1900-2100MHz frequency band, 4G works in the 2300-2500MHz frequency band, and 5G works in the 3400-3600MHz frequency band. Bluetooth and WiFi work at 2.4GHz.

There is a law in economics: the law of value is the basic economic law of commodity production and commodity exchange, that is, the value of commodities depends on socially necessary labor time, and commodities are exchanged with each other according to the principle of equal value. In a private ownership society, the law of value spontaneously regulates production, stimulates the improvement of production technology, and accelerates the differentiation of commodity producers. In a socialist society, since the socialist economy is a planned commodity economy based on public ownership, the socialist market economy must consciously base and apply the law of value to promote the development of the socialist economy. This law is particularly evident in the field of cell phone jammers.

Looking at past signal shielding projects, the part that best reflects the value is the real needs of customers. In other words, the real factor that determines the price is the needs of customers. For example, in a 50m*50m indoor area, the cost of building a nearby base station without a base station will be lower than that of a base station; the cost of an open indoor area without obstruction will be lower than the cost of an area with obstruction; the cost of 24-hour uninterrupted full-band shielding will be lower than the cost of an intermittent one. The price of partial frequency band shielding is lower; the price of rough test shielding (only center shielding) is lower than the price of precise shielding; etc.

In the signal blocker project, according to the customer's needs, the layout of the site and the strength of the radio signal, the shielding system is often built in the form of shielding host + antenna distribution. This is a reliable technology that is more professional and focuses on results in the field of shielding. Military The shielding method preferred by police government units and security agencies. Compared with a single device, the system is more reliable. Its price also changes with the size of the shielding area and the on-site environment.

In families, some parents are worried that their children will consider buying jammers if they are addicted to mobile phone networks. They often secretly purchase signal jammers worth hundreds or even thousands of dollars. These devices will directly interfere with the use of mobile phones in the neighborhood. The three major operators will conduct investigations after receiving complaints. If found, they may be subject to illegal penalties.

Therefore, the determining factor in the price of mobile phone signal jammers is user demand. If the shielding requirement is high, the price will be high, and if the shielding requirement is low, the price will also be reduced. However, the original intention of shielding is to achieve results without affecting third parties, so a relatively perfect shield will not be too cheap, due to the law of value.

The higher the power of the cell phone signal jammer, the better the effect. In fact, this is not the case. For example, if a space is about 400-500 square meters, you should choose a mobile phone signal jammer that can block about 600 square meters. It’s not that the higher the power, the better. After all, the power of a mobile phone signal jammer has a safe power range. Some customers expressed why most merchants' machines have poor shielding effects when the signal source is very close, while some merchants have very good effects. In fact, the poor signal shielding effect when the signal source is close actually proves that these The merchant is a legitimate merchant. Is to comply with safety is the power range. On the contrary, when the signal source is very close, the shielding effect is very good and the power is quite high. It is important to pay attention to these machines, because such machines have exceeded the safe power of normal use. Not only will it affect the uplink signal source, but there are also potential safety hazards, so customers who purchase it should pay attention. Therefore, the bigger the power of the mobile phone signal jammer, the better.

1. output power

The output power of the shielder

Antenna radiation performance (antenna gain, directivity, etc.)

2. How shielding works

Nowadays, mobile phones use digital signals, and digital signals have strong anti-shielding capabilities. Generally, the effect of shielding digital signals using analog signal technology is poor, so digital signals must be used to shield digital signals. Digital shielding signals and analog shielding signals of the same power have a negative impact on mobile phones. The shielding effect is very different. The signal jammer for sale using digital signal shielding technology has lower power and higher efficiency than the jammer using analog signal shielding technology.

3. Indoor and outdoor are different

The analysis of synthesis, attenuation, and reflection of indoor mobile phone signals and shielded signals is very complex.

4. Before shielding, the strength and quality of local mobile phone signals have a great impact on shielding. Different mobile phones have different effects. Generally, mobile phones with strong ability to receive weak signals may not necessarily have a good anti-shielding effect.

5. The direction and distance of the signal source and the direction of the mobile phone shielding area also affect the shielding effect.

6. Shielding distance and radio signal transmission distance characteristics. Now we will briefly discuss the shielding distance based on the attenuation of radio signal transmission in free space. According to the transmission theory formula, every time the radio wave transmission distance is doubled, the signal strength is attenuated by 6db (the signal power is reduced by 4 times). . Let's take a certain mobile phone signal jammer GSM 900MHZ as an example. If the mobile phone signal strength in a certain area that needs to be blocked is -50dbm, and the effective shielding distance of the jammer is 10 meters, the change in mobile phone signal strength will directly affect the shielding distance. , see the table below for details:

Note: dbm is the abbreviation of dbmw, which represents the power intensity unit of radio equipment or signals, that is, decibel milliwatts

Generally, the signal strength in space is around -60 to -70dbm, and the maximum within a few hundred meters of the base station can reach around -40dbm. The mobile phone reception strength range is generally between -35 to -95dbm.

The higher the signal power intensity of space mobile phones, the shorter the shielding distance.

The above discussion is based on the rules of radio signal transmission in free space (the so-called free space is similar to space). In reality, there are many obstacles on the ground that affect radio wave transmission. The above conclusion can only be used as a qualitative reference, especially The above rules are very different from reality indoors. Therefore, this issue is difficult to calculate accurately at the moment and can only be determined based on the actual situation on site. Accurate construction projects must conduct preliminary research and signal testing, and then design specific solutions. In the later stage, timely tracking and testing are required, and certain corresponding supplements must be made to be foolproof, that is, to achieve a strict shielding effect.

The most widely used mobile phone standard currently is our gsm global system for mobile communications. GSM standard equipment accounts for more than 80% of the current global cellular mobile communication equipment market. It is widely used and maybe we are familiar with the use of mobile phones. That's right, phone calls and text messages rely on GSM to provide a stable network data type. However, there is much more to GSM networks than we know. The gsm module is one of the directions that many electronic manufacturers are familiar with and carefully researched. It is used in many aspects of life, but we don't understand it. Common access control security systems and GSM network car security systems and robots have been applied to gsm modules.

GSM also supports indoor coverage. The power of the outdoor antenna can be distributed to the indoor antenna distribution system through a power divider. This is a typical configuration used to meet high-density call requirements in homes, which is common in shopping malls and airports. Indoor coverage can also be achieved via wireless signals within buildings, but this improves signal quality and reduces interference and echo.

First, GSM is the basic network band used for mobile phone voice communications and SMS services. It is known that inappropriate use of mobile phones is serious and using mobile phones in public places can cause a significant noise impact to other people. Can you imagine how annoying it would be when you are reading and relaxing in silence and suddenly someone is making a phone call? I agree. We don't like to be disturbed when we need to be quiet.

The gsm network band is very important for the use of electronic devices. Therefore, in many places where the use of mobile phones is prohibited, jamming equipment that blocks basic mobile phone communications is installed. This is what we often call GSM jammers.

When purchasing a gsm jammer, we need to understand our own needs. For example, in addition to the gsm network, we need to block the signal type and whether it is necessary to block the 3G and 4G network bands. In this way, we can buy a cell phone jammer that blocks all cell phone signals. Additionally, we purchase electronic jamming equipment and we need to consider where we use it. Portable jammers allow us to use them indoors and outdoors, while desktop signal blockers use a variety of antenna designs. As the name suggests, they will have a wider range of uses, not just for individuals but also in prisons, courthouses, schools, and other larger venues, as they have a wider interference radius and more types of signal shielding.

For personal use, I recommend a 4-antenna portable gsm jammer. It's enough to meet your needs and provide you with a quiet reading environment wherever you need to keep quiet. For a company or important organization, the powerful multi-antenna desktop jammer will be your best choice. It stands out in terms of functionality and interference radius and is considered sufficient for large-scale applications.

1. Take out the screen host from the packaging box.

2. Hang the signal jammer on the wall or corresponding location. The recommended installation height is 1-1.8 meters.

3. First connect the power cord to the host, then plug the power cord into the mains socket, and then turn on the power switch. The work indicator light on the host lights up to start working.

4. For large and small spaces, the installation location is as shown in the figure below.

1. The effective coverage range of the shield is the circular area of the shield, so when using it, pay attention to the correct placement of the shield to avoid blind spots in the shielding.

2. The shielder should be placed in a well-ventilated place, try to avoid large objects, and avoid strong electromagnetic sources of strong heat sources to ensure the shielding effect and long-term stable operation.

3. When the shielder is working, no other objects should be placed on top of it to avoid affecting the shielding effect and damaging the machine.

4. When the cell phone jammer is not in use, the power supply should be cut off in time to avoid affecting the normal use of the mobile phone.

5. When using the shield outdoors, pay attention to waterproofing.

6. When the area of the site used is larger than the effective screen range, it is recommended to use multiple jammers to be installed in a honeycomb manner to ensure the screen effect.

7. Please stay away from corrosive gases and liquids, and be dustproof and moisture-proof to avoid accelerating the aging of the internal components of the equipment.

8. When placing it outdoors or in the wild, you should pay attention to adding protective devices in environments where rats, ants and other destructive animals are infested.

1. The shield is a maintenance-free device and requires no maintenance.

2. When wiping the surface, avoid using chemical solvents and avoid water entering the machine.

3. The shielder should be stored in a dry and ventilated place to avoid long-term exposure to salt spray and harmful gases.

4. The jammer has a three-year warranty, free replacement within one year, and lifetime maintenance.

It can be said that mobile phone signal jammers have brought great help to our lives, but we don’t know much about the specific knowledge of mobile phone signal jammers. Let’s learn about the mobile phone jammers we usually encounter. Frequently asked questions about signal jammers.

(1) When the mobile phone signal jammer is working, why do some mobile phone signal indicators show that there is still a signal?

Answer: This is just an illusion. In fact, the mobile phone could no longer communicate at this time. When you press the unplug button at will, you will find that there is no signal indication at all on the signal indicator.

(2) Will the mobile phone signal jammer interfere with the normal operation of other electronic devices?

Answer: No. This is because the electromagnetic signal emitted by the cell phone signal jammer is completely within the mobile phone operating frequency band specified by the country and will only block mobile communications. And this signal is always in a relatively static state and will not affect any electronic equipment.

(3) Are mobile phone signal jammers harmful to the human body and mobile phones?

Answer: Please rest assured that the electromagnetic signal intensity emitted by the mobile phone signal jammer is very weak. Test data shows that this signal intensity is far from causing harm to the human body. At the same time, the mobile phone signal jammer only blocks the forward signal of the mobile phone so that the mobile phone cannot contact the base station, so it will not cause any damage to the mobile phone itself.

(4) Is there any difference in the effective shielding distance of mobile phone signal jammers when used indoors and outdoors?

Answer: Yes. The effective shielding distance (30-40 meters) of a mobile phone signal jammer generally refers to the indoor distance. In outdoor open areas, the effective distance of shielding can reach several hundred meters. It should be pointed out that whether it is used indoors or outdoors, the effective shielding distance of the jammer has a certain relationship with the environmental conditions at the time, such as the distance from the base station, the placement location, etc. Therefore, when using a mobile phone signal jammer, this factor should be fully considered to avoid shielding dead spots that will affect the shielding effect.

(5) The case of the mobile phone signal jammer becomes hot after working for a period of time. Will working for a long time damage the machine?

Answer: Thank you for your attentiveness. This is a normal phenomenon. In terms of design, we use the thermal conductivity of fans and corrugated thickened aluminum alloy thermal strips to assist in heat dissipation. This ensures stable work for a long time. Therefore, the machine will not be damaged if the casing becomes hot.

Nowadays society, mobile phone is our daily essential items, almost manpower a mobile phone gives us a lot of convenience, but sometimes also cause a lot of inconvenience, which occasions need to avoid mobile phones, need to use cell phone signal jammer?

School is a place to study, students addicted to mobile phones and classroom "small actions" greatly affects the academic, many schools will take to confiscate the mobile phone handed over to the way of mandatory education, but this not only greatly harms the self-esteem of the students, but also allows students to lose contact with parents in the outside world, the use of mobile phone signal shielding, can be in the classroom to learn! Time to shield the signal, students can play in their spare time to communicate, over time will form good learning habits. Relative to the examination room more need to pay attention to, fairness and justice is the basic norms of society, from primary school to university, civil service and other types of examinations essential, in the solemn examination room is not allowed to mobile phone ringing and cheating phenomenon, however, there are always some bad candidates will bring mobile phones into the examination room, so as to use the mobile phone communication for cheating, this time is available to the mobile phone signal shielding device, shielding the examination room, the mobile phone can not be networked with the outside world to communicate, can be a good way of communication with the outside world, the mobile phone signal shielding device, can be used in the classroom. The outside world for networking communication, can ensure fairness and justice to a large extent.

In the company's business, mobile phone signal shielding is also essential, the company leaders will hold large and small meetings, in these meetings, open mobile phone signal shielding, can make the meeting unaffected, not interrupted, improve the efficiency of the leadership meeting, the staff can also be more focused on listening to the content of the meeting, which can be said to be two birds with one stone.

Stage people are performing, the people under the stage if the use of mobile phones, it is likely to affect the performance of the people on stage. In order to ensure the normal performance of the concert hall, the field strength signal survey, accurate judgement of the concert hall field strength signal category, and then use the appropriate signal blocker.

The network is filled with a variety of prisoners in prison can also use the mobile phone questioning and a variety of prisoners using mobile phones and the outside world to contact the crime news, the prison, the guardhouse in the end can use mobile phones? Of course not, for these phenomena, the use of mobile phone signal blocker to block all contacts between prisoners and the outside world, to prevent prisoners from serving their sentences during the unlawful acts, improve the overall control of the security agencies. In fact, mobile phone signal blocker applicable scene is quite wide, because of their own signal shielding needs, many units will purchase and use mobile phone signal blocker. The use of mobile phone signal shielding must be consistent with their own needs, but also have to take into account the laws and regulations, have to be reasonable use of shielding, not because of their own shielding needs to the operator's communications, and even the base station to cause adverse effects.

If you want to understand the answer to the question of whether a mobile phone signal jammer has an impact on laptop Internet access, you must first understand the interference frequency band of the mobile phone signal jammer and the frequency band used by laptop computers to access the Internet.

First of all, if the interference frequency band of the mobile phone signal jammer overlaps with the frequency band used by the laptop to access the Internet, it will affect the laptop's Internet access function. Let’s first take a look at the interference frequency band of cell phone jammers. Due to the wide signal coverage of domestic operators and the wide range of application standards, mobile phone signal jammers must achieve the effect of blocking the entire network. Generally, they will effectively block interference for 2G, 3G, 4G band signals, WiFi, GPS, and Bluetooth signals.

After understanding which frequency bands the mobile phone signal jammer introduced above can interfere with, let’s take a look at the frequency bands used by laptops to access the Internet.

Laptops generally have two ways to access the Internet, one is wired Internet access, that is, Ethernet network port Internet access, and the other is wireless Internet access. At present, mobile phone signal jammers cannot block or interfere with wired Internet access, so here we mainly describe the frequency bands for laptop wireless Internet access. According to the current classification of laptops on the market, wireless Internet access supports single-band and dual-band. The so-called single-band refers to only supporting WiFi2.4 frequency band to connect to the Internet, while dual-band supports WiFi2.4 and WiFi5.8 frequency bands to connect to the Internet. Most laptops only support single-band, and some that are more expensive or have more conscientious configurations will be equipped with dual-band Internet access.

After understanding the respective working frequency bands of signal blockers and laptop computers, sharp-eyed people may immediately understand the issue of whether mobile phone signal jammers have an impact on laptop Internet access. Simply put, mobile phone signal jammers may affect laptop Internet access.

1. The mobile phone signal jammer does not have a WLAN module and will not affect the wireless Internet access of laptops;

2. The mobile phone signal jammer supports the WiFi2.4 frequency band, which affects the wireless Internet access of single-band laptops but does not affect the wireless Internet access of dual-band laptops;

3. The mobile phone signal jammer supports WiFi2.4 and WiFi5.8 frequency bands, which will affect the wireless Internet function of the laptop.

Through the above detailed understanding, we have the answer to whether the mobile phone signal jammer will affect the laptop's Internet access. The mobile phone signal jammer may affect the laptop's wireless Internet access. For those customers who need to use mobile phone signal jammers for shielding, they need to equip laptops with Ethernet cables for connecting to external network offices, so as to achieve the best of both worlds.

Generally speaking, many places do not have clear legal regulations on signal interference devices, but for our use, we should also understand the relevant precautions, including the maintenance of equipment performance, and where I can use it. Among our common cell phone jammers, signal jammers prohibit the use of mobile phones, prevent harassing calls, and prevent mobile phones from ringing, while GPS satellite positioning jammers protect the whereabouts of vehicles, prevent tracking, and protect location privacy.

Some things you need to pay attention to when using cell phone jammers in daily life

The interference radius of the signal jammer sold online may be related to the specific location of your use, and sometimes it cannot reach the required range, which may be affected by the surrounding environment. You should use a signal jammer that is easy to carry and blocks interference, it can protect your privacy.

Based on years of customer feedback and our experience, here are some details you should pay attention to when using signal jammers. Please read carefully.

1. Make sure the antenna and other accessories are installed correctly;

2. To ensure sufficient power, the handheld indicator light turns yellow or red to indicate that the power supply has been dropped, and the shielding effect is not as good as usual;

3. Ensure that the mobile base stations are more than 200 meters apart;

4. The shielding effect depends on the surrounding environment. The interference effect of mobile phones used in urban areas is better than that in cities. Because the density of mobile base stations in cities is larger and the distance between base stations is closer, the signals emitted by urban mobile base stations (where the jammer needs to be blocked) are stronger than those in urban areas. multiple times;

5. When using a jammer, there should not be any metal objects or wall obstructions around the antenna and between the jammer and the phone to block signal transmission;

6. Strong magnetic field and strong electromagnetic wave environment will affect the interference effect;

7. The installation height of the jammer should be as high as possible to the same level as the device you want to shield;

8. Long-term use of interference opportunities causes high heat and affects the interference radius;

9. When the phone is on a call, the jammer will not easily block the signal (the signal is very strong during the call);

10. The radio wave emitted by the jammer is a high-energy material. It is normal for the machine to heat up due to the collection of high-energy materials;

11. There is a certain lag in the refresh of the signal display grid on the mobile phone. You may have turned on interference but the mobile phone still shows signal status, but in fact the mobile phone cannot be used. Please refer to the actual results;

12. To test the function of the GPS jammer, please download the GPS signal detection software to test the shielding effect, or open the car navigation function test;

13. The wifi jammer device with WIFI interference function will also block other appliances with WIFI, such as wireless microphones, speakers, monitors, etc.