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Point-to-multipoint wireless digital bridges can connect multiple discrete remote networks into a single structure, which is more complex than point-to-point wireless bridges. Point-to-multipoint wireless digital bridges often use a network as a central point to send wireless signals, and other receiving points perform signal reception. The central antenna uses different central antenna configurations in different projects: Omnidirectional antenna: The omnidirectional antenna distributes the...
An antenna is an inverter that transforms a guided wave propagating on a transmission line into an electromagnetic wave that propagates in an unbounded medium (usually free space) or vice versa. Components used to transmit or receive electromagnetic waves in radio equipment. Radio systems, radio, television, radar, navigation, electronic countermeasures, remote sensing, radio astronomy, and other engineering systems, all use electromagnetic waves to transmit information, rely on antennas to...
There are many similarities between lightning protection of radio and television shared antenna systems and cable television systems and microwave systems. For example, the requirements for lightning protection of antenna feeders and lightning protection of transmission signal cables are basically the same. Only the signal cables of television systems are subject to Streets and lanes are visited by thousands of households, and some of their body and details have to be explained. At present,...
The microwave transmission can be understood as simple as this: There are direct waves and reflected waves in the propagation path from the transmitter to the receiver. The oval area under the direct wave is called the Fresnel zone. The odd Fresnel zone differs from the direct wave by an odd number of half wavelengths in succession, but the same phase arrives, which can be a useful supplement to the direct wave. Even Fresnel is just the opposite and can weaken the energy of the direct wave....
Hello everyone, today Xisheng Microvision has introduced the issue of antenna calibration for wireless bridge microwave transmission. In microwave communication, for the calibration of the antenna azimuth angle, the traditional method is to adjust the initial horizontal azimuth and elevation angle of the antenna according to the angle of the design requirements, and then the antenna of the two microwave stations alternately turns up and down. Turn left and right to catch the other's signal....
Shanghai Ruicheng Electric Co., Ltd. is mainly engaged in the BeiDou GPS BeiDou clock, and the products are in stable operation in nearly ten thousand domestic and foreign industries. Now we will summarize the equipment installation, routine maintenance and solutions. Shanghai Ruicheng Electric Co., Ltd. is mainly engaged in the BeiDou GPS BeiDou clock. The products are in stable operation in nearly 10,000 sites at home and abroad. Now we will summarize the precautions for installing the BeiDou...
1. When the server antenna of Beidou school is installed, first install the antenna head on the antenna bracket, and then fix the antenna bracket on the top of the building with expansion bolts. According to the installation conditions, the angle bracket (optional) can be used. The antenna head should be installed outdoors. The installation location should be wide open and installed on the roof as much as possible. In principle, the antenna head can look up to see the 360° sky. Then arrange the...
When we introduce products to our customers, we will refer to the word antenna. Friends who have come into contact with wireless bridges will know that wireless bridges have antennas, but they are divided into built-in antennas and external antennas. Because the built-in can't see it, it is often mistakenly thought that there is no antenna. Many customers will ask whether it is good to have an antenna or not to use an antenna. Today, Xiao Bian has formally responded here. No matter what...
The Tencent Digital (Blue) Samsung GALAXY C9 is getting closer and closer to us. After the aircraft was successively approved by the radio transmission model and tested by the FCC (Federal Communications Commission), there are now suspected publicity posters. . A few days ago, Samsung’s official microblog released a propaganda poster of a mysterious new machine, accompanied by a copy of “The next big thing is coming”, suggesting that there will be a new heavyweight machine. Although Samsung did...
Tencent's digital (OPL) OPPO R9s series will be officially released next week, but now the network has been previously exposed on the new machine configuration and spy photos, confirmed that there will be OPPO R9s and R9s Plus two new machines debut, and use Three thin wire antenna strip designs, the latter will also carry Xiaolong 653 processor and has 6GB of memory, as for the price is based on the exposure of the offline channel poster shows that OPPO R9s is priced at 2,999 yuan, and...
The OPPO R9s will be released soon. Today, there is another back detail photo: OPPO R9s adopts a new micro slot antenna design. Micro slit antenna is fine to 0.3mm, which integrates technology and aesthetics. It is slender and tough. It hides with the change of light and shadow, leaving the whole body with a purer metal texture on the back of the fuselage. People are refreshing. Figure: OPPO R9s adopts a new micro slit antenna design At the same time, OPPO R9s has also officially opened...
Tencent Digital (Blue) After the Samsung official had released a propaganda poster of a mysterious new machine, a lot of people at that time launched the upcoming GALAXY C9. Now, news from Samsung's official music community said that the aircraft may be named GALAXY C9 Pro, and the synchronized exposure rendering also shows the use of "three-striped" antenna design, allegedly the first use of the so-called MSA ( Micro-slit antenna) technology, this new machine has got a network...
The researchers said he designed a new, flexible, stretchable and bendable health monitoring device that can be worn during exercise. "Even if it is severely bent, twisted or stretched, our antennas can still function," said researcher Zhu Yong, an associate professor of mechanical and aerospace engineering at North Carolina State University. "This is important because embedded applications wearable devices can accept various deformations to move patients." Health monitoring...
IT168 Information Although Nokia's new low-end D1C may not be able to miss the domestic market, there are higher-end products that will meet us soon. A few days ago, some netizens released a set of Nokia's mysterious new machine's back cover spy photos, not only using a metal body, but also has a similar antenna design of the iPhone 7 crown, as the back of the two openings in the end is a double There is no definitive answer for the camera or the sensor with a fingerprint sensor...
IT168 News Samsung held a communication meeting in Beijing on the morning of November 9th. The Samsung C9 Pro that was previously exposed was officially unveiled in China. Samsung C9 Pro received much attention before it was launched. Samsung stated that C9 Pro is a product designed for young people. The design process has undergone various research and improvement. It uses a unique micro slot antenna design to start the Xiaolong 653 processor and is equipped with 6GB of storage for WeChat...
[IT168 News] Although Huawei Mate 9 has just been released soon, but the market has already begun to spread the news of Huawei P10. A few days ago, some friends exposed the spy photos of two Huawei mysterious new machines, it is said that Huawei P10 will use this design, its main feature is the use of pre-fingerprint identification and the design of the back of the crown antenna, also equipped with Leica The technically supported dual camera is likely to be a prototype version of Huawei's...
Tencent Digital (Blue) With the appearance of the Huawei P10 prototype on the Internet, the release of this new machine has naturally become the focus of attention. According to foreign media report Gearburn, Huawei's marketing director Hawa Hyath in Africa recently said that Huawei will first launch Huawei's Nova series in South Africa in February next year, and in March it will launch Huawei's new Mate 9 series. Then Huawei P10 will become the main focus. Therefore, this also...
Tencent's digital news (water blue) news that Meizu PRO 7 will be launched early next year has been hotly fired, and even the so-called renderings have appeared on the Internet. Now, the user broke the news and released two suspected Meizu PRO 7 spy photos on the back of the Meizu Forum. Its appearance is the same as the renderings we saw before. It has a camera surrounded by a ring flash, and the antenna strip is completely removed, but It is not yet possible to determine the authenticity...
Tencent digital news (water blue) there will be three iPhone debut next year, there seems to be no suspense, but the various models have what characteristics are different opinions. And now, the well-known analyst Guo Mingwei brought us the latest news in the latest report, indicating that iPhone sales in the second half of next year will reach a record 150 million units, while the 4.7-inch next-generation iPhone will use LCD display Screen and glass back cover design, and will also join the...
GPS is a terminal that performs positioning or navigation by receiving satellite signals. The antenna must be used to receive the signal. GPS satellite signals are divided into L1 and L2, and the frequencies are 1575.42 MHz and 1228 MHz, respectively. L1 is an open civil signal and the signal is circular polarization. The signal strength is about 166-DBM, which is a relatively weak signal. These characteristics determine the need to prepare a dedicated antenna for the reception of GPS signals....
Wireless Bridge Antennas and Security Considerations: Please observe the following precautions for antenna installation: l For most lifting antenna installations, we recommend that you consult a professional installer for the correct and safe method. l With security in mind, you cannot touch even a part of your body that is touching a transmitting high-gain antenna. l Please carefully follow your antenna's installation guide l Keep the antenna away from metal objects/adverse factors....
An antenna is a transformer that transforms the guided wave propagating on a transmission line into an electromagnetic wave that propagates in an unbounded medium (usually free space) or vice versa. Components used to transmit or receive electromagnetic waves in radio equipment. The feeder is the signal cable that the early TV and the outdoor antenna are connected to. The line is generally flat and the distance between the two lines is wider. The purpose is to reduce the attenuation of the...
Vehicle antennas are used for radios and radios in cars, and some have built-in antennas. The car antenna refers to a mobile communication antenna that is designed and installed on the vehicle. The most common is a sucker antenna. Because the sucker antenna is easy to install and place, the sucker antenna is often used instead of the base antenna in some simple setting stations. Vehicle antennas have shortened, quarter-wavelength, center plus, five-eighth, and one-half wavelength antennas. The...
Abstract: CAN bus is one of the most widely used fieldbuses in the world. It has been used more and more in China. The multi-motor backlash control mode is often used in large-scale radar antenna control systems, mainly to eliminate the gear gap of its turntable. This paper is based on the CAN bus and PCC-based high-precision multi-motor anti-backlash antenna control system as the background, focusing on the control principle of the system and software and hardware design. 1 Introduction In...
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Privacy statement: Your privacy is very important to Us. Our company promises not to disclose your personal information to any external company with out your explicit permission.