China Shenzhen Atnj Communication Technology Co., Ltd. Company News

On behalf of ATNJ, we would like to wish you Merry Christmas&Happy New Year!   We hereby sincerely invite you and your company representatives to visit our booth(5J59) at MWC BARCELONA 2025--THE 31ST MOBILE WORLD CONGRESS from Mar 3rd to 6th 2025.   We are a professional R F manufacturer mainly engaged in R&D, production, manufacturing, sales, and technical services with 14 years of experience. The main products include :LTE NR 4G 5G series repeater, RF modules, SDR core board, Active&Passive devices. DAS antenna distributed system, Digital optical fiber distribution, Technical solutions for Public and Private network base station,Public Safety and Low altitude economic construction Meanwhile, we undertake O E M, O D M services and projects of various R F, wireless repeaters, multi-frequency DAS systems, remote network management center OAM, and equipment provision of indoor and outdoor signal coverage projects.   It would be a great pleasure to meet you at the exhibition. We eagerly anticipate the opportunity to engage in a more extensive and joy work with you.   Exhibition Center: Fira de Barcelona Gran Via Spain Booth Number: 5J59 Company: Shenzhen ATNJ Communication Technology Co.,LTD Date: Mar 3rd to 6th 2025  

OVERVIEW ：   Digital Full Frequencies Anti-terrorism&riot System is a security prevention and control device using software Defined Radio (SDR) technology and communication technology. The device is specifically designed for radio frequency countermeasure applications, especially to eliminate various security threats to the wireless spectrum. It can effectively detect and locate the spectrum source of unsafe factors in the coverage area, and then quickly generate adversarial signals to make the object lose control or unable to receive instructions, so as to achieve the purpose of prevention. The system is designed to help law enforcement and security agencies provide support in counter-terrorism and maintaining order.   WORKING PRINCIPLE：   The system is mainly centered around an SDR platform composed of FPGA and RF direct sampling transceiver. It features a 32-bit high-precision frequency control and an 8T8R, 14-bit ADC and DAC RF direct sampling transceiver, with an operating frequency ranging from 20 MHz to 8000 MHz. Through the digital signal processing unit within the equipment, the system generates digital source spectrum interference signals and transmits them to the target frequency band. These interference signals can incapacitate various frequency bands, such as those commonly utilized by civilians like unmanned aerial vehicles, GPS-enabled mobile phones, or commercial public networks, illegal and suspicious radio waves, pagers, two-way radios, remote controls, etc., preventing them from operating normally.   PRODUCT FEATURE：     ①Integration of detection and counter-attack --- systematic combination of radio detection and countermeasures,a set of equipment to achieve identification and jamming countermeasures ②Super-wide spectrum targets - common civil and commercial frequency bands and even private networks and other types of wireless devices. ③Multi-target disposal -- support multi-target detection and identification at the same time, and can implement countermeasures to multi-targets. ④Omnidirectional reconnaissance jamming has ultra-long working distance -- the open area can reach 0~3000 meters with high-power and high-gain omnidirectional antenna wireless jamming. ⑤Fully intelligent, can customize the interface of the management equipment, can also be no personnel on duty - can be set in the system specified frequency range for automatic detection and countermeasures, not affected by bad weather.   PRODUCT APPLICATION：   Airports, forts, important speeches, important meeting places, public safety departments and specific places, etc., are used to ensure airspace security, prevent all kinds of threatening wireless signal intrusion and malicious attacks, and protect public safety and important facilities.                      

Software Defined Radio (SDR) board refers to a hardware device with programmable and flexible wireless radio functions. SDR technology enables users to configure and control signal processing and modulation/demodulation processes of wireless radio devices through software, without the need to change the hardware structure. SDR core PCBA board features: 1. SDR platform consisting of FPGA and RF direct acquisition transceiver. 2. 100K logic resources, 424 18*18 multipliers, resource-rich FPGA. 3. 4T4R 14-bit ADC and DAC RF direct sampling transceiver . 4. Working frequency: 400MHz~8000MHz. 5. Large scanning bandwidth, currently supports the maximum sampling bandwidth of 160MHz per channel; It can be designed to support a maximum sampling bandwidth of 800MHz per channel. 6. 32 bit high-precision frequency control. 7. Each RF channel, input and output have DSA built-in, and the attenuation range is 0~31dB. 8. No LO leakage and I/Q imbalance.   Typical Application： Public network 3G, 4G, 5G, TDD and FDD mobile communications, signal monitoring systems, other radio radar and detection, private network communication systems, etc. SDR boards are widely used in communication, wireless radio spectrum monitoring, RF testing, education, and research fields, providing users with flexible, customizable, and high-performance wireless radio solutions.

What is a Cell Phone Repeater?   A cell phone repeater (also known as cellular repeater, amplifier, or cell signal booster) is a device used to improve cell phone reception in an indoor outdoor environment. A cell phone repeater is typically made up of three primary components: A "donor" antenna - also called a "reception" antenna A bi-directional signal amplifier One or more rebroadcast antennas Cell phone repeaters are most often installed inside buildings, and are used to bring signal from outdoors into the structure, negating attenuation of RF signal caused by the building materials. In-building cell phone repeater systems typically use an outdoor donor antenna to transmit and receive signal from the nearest cellular signal. The outdoor donor antenna is connected via coaxial cable to an amplifier unit which amplifies the signal, and retransmits it locally via one or more indoor antennas, providing improved signal strength inside the building. Smaller cell phone repeaters are also used inside vehicles, boats, and recreational vehicles to improve reception for users. For more information on available cell phone booster kits and antennas, read our cell phone booster guide. How Cell Phone Repeaters Work The active component of cell phone repeaters is the bi-directional signal amplifier. A bi-directional amplifier amplifies signal in both the uplink and downlink directions. This allows cell phones served by the rebroadcast antennas to both send and receive data from nearby cell towers. A bi-directional amplifier typically contains the following components: Diplexers or power splitters to split signal into multiple bands. Duplexer filters to separate the uplink and downlink blocks within bands. Amplifiers The block diagram below shows a typical layout of a dual-band bi-directional amplifier:   Requirements for Operation In order to use a cell phone repeater to improve signal coverage, two primary requirements must be met: Adequate donor signal Adequate isolation between donor and rebroadcast antennas Adequate donor signal All RF amplifiers add noise to the existing noise floor from the donor signal. The additional noise added by an amplifier is referred to as its "noise figure." For most amplifiers, this is between 6 dB and 8 dB. In order for a cellular repeater to operate correctly, the signal-to-noise ratio (SNR) of the donor signal must be greater than the noise figure of the amplifier. Without adequate signal at the donor antenna location, no improved signal will be experienced by users. Isolation between antennas For correct operation of a cellular repeater, the isolation between the donor and indoor antennas must be greater than the gain of the amplifier. If adequate isolation does not exist, amplifier feedback effects will cause "oscillation." In the US, the FCC requires that all consumer-rated boosters include automatic gain control (AGC). AGC reduces the gain of bi-directional amplifiers to ensure that the amplification is always lower than the path loss isolation between the outdoor an indoor antenna. The FCC requires that If a device is unable to control oscillation effects by utilizing AGC, it must detect the oscillation and automatically shut down.

Mobile phone signal booster is also called a repeater, mainly used to deal with weak signal, can not receive smoothly the problem, mobile phone signal booster can be applied in the following fields:   1. There is no signal in the large plant; 2. Home, office, luxury yacht, private car, public security system and highway safety management, etc.; 3. Small hotspot signal complaint areas, such as conference rooms, small supermarkets, small shopping malls, offices, small public areas, etc.; 4. Signal blind zone or weak signal area in small area, such as underground or semi-underground business places, small basements, underground parking lots, etc.; 5. Areas with high traffic volume and social influence, such as bars, Internet cafes, dance halls, cafes, health clubs, leisure and entertainment venues, etc.   The above is the applicable field of mobile phone signal booster, you can consult our ATNJ professionals when installing, to avoid interference with the surrounding signal, do not affect the normal use.

Detailed description of the adjustment of the mobile signal amplifier:   1. The indoor antenna installation should be away from the outdoor antenna to prevent mutual influence. Indoor antennas need to be separated from outdoor antennas by walls. 2. The indoor antenna should be installed at an angle of 2 meters above the interior wall of the house or inverted on the ceiling ceiling. 3. All kinds of connectors must be wrapped with adhesive tape to prevent water seepage from being oxidized, resulting in a smaller coverage of data signals in the house.   Common failures of mobile phone signal amplifiers:   First, after installation, there is no practical effect at all 1. First check whether the display light on the amplifier server can be lit to determine whether the power can be connected 2. Then clarify whether the selection of spare parts such as amplifier servers and wireless antennas can be appropriate, and whether they can be paired with the type of mobile phone card they are using;   3. Determine whether the indoor and outdoor sockets, regulators, and wireless antennas of the amplifier server can be properly connected. Second, after installation, the data signal is improved, but no phone calls can be made   1. Make sure the outdoor antenna is installed properly; 2. Determine that the data signal is stable at the location of the outdoor antenna, and the orientation of the wireless antenna is as biased as possible to the data signal transmission communication base station; 3. Determine the length of the data signal transmission line of the outdoor antenna and the amplifier (preferably not more than forty meters, not less than ten meters);   4. How to never get it, adjust the amplifier with higher power or ask a professional operator to check it comprehensively. Three. , The call sound quality is not very good 1. Adjust the orientation of the outdoor antenna so that the orientation of the wireless antenna is as biased as possible to the data signal transmission communication base station; 2. Change the movement of the data signal transmission line from the outdoor antenna to the amplifier server (the approaching straight line, the route cannot be turned too much, and the right angle of 90° cannot be turned); 3. The route from the outdoor antenna to the amplifier server should be coaxial above 50 ohm-7D as much as possible;   4. Determine whether the distance between the outdoor antenna and the indoor antenna can be too close (too close will generate self-excitation), the specification spacing is above ten meters, it is best to have walls, stairs and other objects isolated, and it is proposed that indoor and outdoor wireless antennas cannot be installed on the same level, to avoid the data signal sent by the indoor antenna is received by the outdoor antenna to generate infinite loop expansion (self-excitation).   Fourth, the data signal has been improved after installation, but the coverage is not large 1. Determine the part where the outdoor antenna is installed has sufficient data signal and strong signal; 2. Make sure that the data signal transmission line from the indoor antenna to the amplifier server is not easy to be too long, the route connector is properly intact, the route raw materials meet the regulations, and the regulator is not connected too much; 3. Appropriately install indoor antennas according to specific conditions; 4. Choose a mobile phone signal amplifier with greater output power.  

  When the data signal grid is lower than 3 bars, everyone will involuntarily feel that the current data signal is not good, maybe this is not the case.     For example, are in the elevator, some people's mobile phone signal has 1 bar can still chat and talk on the phone, maybe the 3 data signals of the mobile phone icon sent to WeChat Moments but always can not be forwarded.   There are many such reasons that occur, but one misconception must be corrected first, and the data signal grid does not necessarily represent the mobile phone signal. Each mobile phone has a different optimization algorithm for the data signal grid, which is why the above situation occurs. Even if the data signal grid does not represent the mobile phone signal, what are the uses of the mobile phone signal grid? The original intention of the data signal grid setting is to indicate the current data signal status of the mobile phone, and the Internet will select the best communication frequency and entrance for the mobile phone.   If you choose a mobile phone that is suitable for multi-frequency points in areas with more people, the mobile phone signal will jump to the frequency point where the number of access times is relatively small. Therefore, even if consumers' mobile phones use the same network operators and are connected to the same mobile phone towers as the mobile phones of ordinary users in the surrounding areas, the number of data signal grids indicated on the mobile phone may not be the same.     In terms of removing external influences, a large number of data signal grids do represent better data signals, in fact, the number of data signal grids is only for reference, and cannot be used as a specification to judge the advantages and disadvantages of data signals. Mobile phone signal booster|How does the mobile phone signal grid change?     The key to the change of the mobile phone signal grid lies in the data signal optimization algorithm embedded by the manufacturer for the mobile phone signal, and the key to the change of the data signal grid is the refresh rate of the data signal optimization algorithm. If the data signal update optimization algorithm embedded in the mobile phone is very fast, the data signal changes rapidly, and vice versa, the data signal changes slowly. This means that if ordinary people use the mobile phone signal grid to find the part of the data signal and better data signal, it is very likely to waste a lot of time.     The above problems our professional mobile phone signal booster manufacturers recommend that you use our ATNJ mobile phone signal booster can easily solve these problems.   Shenzhen ATNJ Communication Technology Co.,LTD is a professional organization specializing in solving mobile phone signal poor, mobile phone signal booster and mobile phone voice communication faults for factories, hotels, villas, clubs, bars and other social places, serving Guangdong Province.

1. Duplex mode TDD: Time Division Duplex. The transceiver shares one RF frequency point, and the uplink and downlink use different time slots for communication. FDD: Frequency Division Duplex, which uses different RF frequency points for communication.   2. Speed Theoretically, under the same bandwidth conditions, such as 10m + 10m allocated by FDD and 20m allocated by TDD, the rate of TDD will be lower than that of FDD. The main reason is that there is a frame called special subframe in the frame structure of TDD. Some of these frames will be wasted (such as the protection time slot) and will not transmit any data, and there is no such complete waste of FDD frames.   3. Coverage TDD-LTE is suitable for hot area coverage, and FDD is suitable for wide area coverage An early Qualcomm report showed that under the condition of the same frequency and power, FDD can provide better coverage than TDD. TDD coverage is 80% (DL / UL = 2:1) / 40% (DL / UL = 1:1) less than FDD. One of the main reasons is that the transmission time of uplink power (TDD) is shorter than that of uplink power (TDD). 4. Moving speed of mobile station FDD is a continuous control system and TDD is a time separated control system. When moving at high speed, Doppler effect will lead to fast fading. The higher the speed, the higher the fading transform frequency and the deeper the fading depth. Based on the current chip processing speed and algorithm, when the data rate is 144KB / s, the maximum moving speed of TDD can reach 250km / h, which is still a certain gap compared with FDD system. Generally, the moving speed of TDD mobile station can only reach half or even lower than that of FDD mobile station. ATNJ Mobile Signal Repeater.pdf

With the progress of science and technology, people pursue a better life and better and better network experience, from 2G to 3G and then to 4G. Now many countries and regions begin to use 5G network, and even some countries are studying 6G. What's the difference between 4G and 5g? In short, it is a fast! G is the abbreviation of generation, which means the era. Since it is an era, the difference is great. We can't just talk about speed. Of course, speed is also one of the very important dimensions. ATNJ Mobile Signal Repeater.pdf   1. Speed. 5G and 4G will have huge differences in transmission speed. If you don't know what the huge difference is, you can compare the previous green car with the current high-speed railway. The current high-speed railway will make medium and short distance travel give up aircraft. However, in the era of green train, there are aircraft. If the economy allows, few people will give up aircraft. 2. All things are interconnected. If you plug a mobile phone card into your car in the existing 4G network, it can be driverless. Even if vehicle identification, obstacle identification and other technologies pass, it may not start well. In the 5g era, all things are interconnected. Many driverless cars send online signals to each other. With the instant sending of various low delay signals, driverless will be safe for more people to use in the 5G Era.   3. Communication standard: according to Moore's law, when the price remains unchanged, the number of components that can be accommodated on the integrated circuit will double every 18-24 months, and the performance will also double. The 4G standard has been launched for so long, and the existing communication methods and rates are designed based on 4G. However, the current hardware development speed is so fast that the existing network inevitably can not fully keep up with the speed of hardware upgrading. After such a long time of development, China, now the world's largest communication consumer, can better meet the needs of the future in the new era, and the starting point of the standard is higher, Compared with the 4G standard, it is subversive. Such network speed has brought great convenience to our life and work. The difference between 4G and 5g lies in the fast and slow network speed, high implementation efficiency and time saving.

  ATNJ Mobile Signal Repeater.pdf Advantages of 5G (1) Speed 5g has a theoretical speed of up to 20 Gbps, and its data rate is several orders of magnitude higher than 4G and 4G LTE. The actual speed that enterprises can achieve depends on a variety of factors, including the proximity to communication towers, the technical complexity of communication operators themselves, and whether network components have been designed to support Gigabit performance. In other words, 5g will enable enterprises to use services that cannot be provided by the original standards, such as automation and advanced video conferencing functions. 5g not only provides higher speed, but also provides what may be more important: low latency. (2) Low delay According to some experiments, 5g significantly reduces the time required for network devices to respond to commands (usually less than 5 milliseconds). Regardless of location, applications and services will work in the same way, eliminating delays that affect real-time communication. (3) Capacity 5g supports connecting much more devices than 4G at the same time, which is estimated to be even as high as 100 times. Therefore, enterprises no longer need to evaluate their cellular and Wi Fi wireless strategies as one or more proposals. With 5g, enterprises can switch between cellular and Wi Fi connections as needed without worrying about the impact of performance or the limited accessibility of mobile broadband, especially in densely populated environments such as Manhattan and other major urban areas. (4) New generation services based on artificial intelligence and machine learning 5g will promote the rise of a new generation of interactive services based on artificial intelligence and machine learning. For example, video conferencing with augmented reality or virtual reality can simulate the environment and help enterprise executives make better project decisions. Automation will enable enterprises to rely on applications and services that are more responsive and predictive than they are today. (5) Rethinking the Internet 5g will become the driving force leading enterprises to rethink the network. Branches of enterprises can use 5g as the main connection medium and adopt Internet services provided by multiple communication operators through SIM cards. Whether you work centrally in the enterprise or remotely from home, you can take advantage of additional automation and security functions. Because 5g compatible components can quickly process and respond to requests, reducing the need for data center backhaul, edge computing will become more important.   Disadvantages of 5G (1) Security 5g transmission security algorithm is more comprehensive than the algorithm supported by 4G standard, but enterprises may encounter other network security problems. As network attackers try to exploit vulnerabilities, a large number of IOT devices and components connected to 5g network will greatly increase the threat faced by enterprises. 5g devices themselves may also attract their attention because the chips and other components designed to drive these devices may be infected with malware by network attackers. Enterprises also need to carefully weigh the technology that their 5g networks use network slicing (a technology that creates a virtual network to host dedicated applications or services). Vulnerabilities in any part of the infrastructure of communication operators may cause serious security problems in the whole network. For enterprises with low risk tolerance, dedicated 5g network may be the best choice. (2) Capex / OPEX In order to fully enjoy the benefits of 5g, enterprises must upgrade and replace network components and adopt processors that support higher speed and performance indicators. It is expected that communication manufacturers will launch 5g compatible devices early next year, but enterprises will have to strive to find ways to maximize 5g investment, because most of their network infrastructure still depends on traditional devices. Its price will be a key consideration because the pricing of operators and equipment is still changing. (3) Uneven coverage Although communication operators continue to invest in 5g, 5g will not be covered in many parts of the United States for a long time. Enterprises with offices in rural areas may be particularly vulnerable to 5g coverage gaps and will have to rely on a combination of traditional network connectivity technologies. Therefore, those enterprises that cannot access 5g may be forced to wait for a period of time before communication operators can provide 5g services in their region, which may be affected by the competition of other operators. (4) Line of sight / penetration problems 5g high-frequency signals are more likely to be blocked by objects, so ensuring the coverage of enterprise offices and factories is always a problem. Enterprises may have to redesign and build some facilities to ensure adequate services or build supplementary radio spectrum networks (such as those based on citizen broadband radio service spectrum), which will enable them to expand the coverage and capacity of 5g networks. (5) Hype factors Operators and suppliers claim that many enterprises may be overwhelmed by how 5g will affect their operations. They have to spend a lot of time fully understanding how they intend to use 5g to get the maximum return and how to prove the required return on investment (ROI). 5g is different from other technologies initially driven by enterprises and then adopted by consumers. When 5g is adopted, the wide adoption of enterprises will be postponed until 5g compatible devices are more widely used, and the real 5g services are provided by operators. The relevance of 5g will only appear when this standard (such as coverage, price points and supported devices) is ubiquitous.