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1
2019 - 11 - 27
2
2019 - 06 - 06
Conventional radio calls from clearing up to 8-10 kilometers, generally up to 3-5 kilometers, in situations where there are tall buildings or mountains block, call a relatively short distance. When has the support of network intercom call distance of a few tens of kilometers. Network is to use the repeater (also called base stations or rotary table), automatically receive signals from radio transmitter, and carries on the enlargement and forward. Networking can enlarge the coverage of radio communication, extended range, clearing up to 10 to 20 kilometers (portable intercom) or 30 to 50 km (car radio), building covering basements, underground parking lot, severe fire channel such as shielding, usually called blind Angle.
3
2016 - 06 - 15
Car antenna Vehicle antenna is refers to the mobile communication antenna design is installed on the vehicle, is the most common sucker antenna. Because the sucker antenna installation put easily, so in some simple set occasions sucker antenna is often used instead of base antenna. The on-board antenna structure have shortened, a quarter wavelength, central loading, five 8 half wavelength, double wavelength in the form of the antenna, in theory, in turn, increase their efficiency, the same working frequency band of the antenna length also increases in turn. Due to limited the vehicle itself is high, coupled with a long antenna in the vehicle at high speed wind resistance, little tunnel, into the underground garage are problem, so the car antenna is not as long as possible, general requirements car antenna is not more than 70 centimeters, the van antenna shorter class requirements. Although small antenna size, shorten type gain is not high, but suitable for use in the occasion of hidden antenna. General police vehicles the installation of a high gain antenna is recommended, especially in the activity area larger vehicles, more than 350 MHZ high gain antenna can be divided into five 8 wavelength loading form, at the top half wavelength distance from the antenna has a loading coil. 400 MHZ band double half wave antenna has high gain, its appearance is characterized by antenna vibrator has two loading coil. Five 8 wave antenna and central type loaded antenna also has a higher gain, and the price is cheaper, so widely used. In as a temporary fixed platform can consider to choose high gain antenna using occasions of sucker antenna, the length of the antenna don't have too many restrictions. Since sucker antenna is designed according to the car use environment under which when used as a fixed so suck a radius greater than 1 m metal plate (such as iron) can have a better effect. Due to the import original vehicle antenna price advantage is very expensive and not stand out, so generally choose domestic car antenna. In antenna selection stage mainly refer to the appearance and the gain of the antenna. Suggest choose big manufacturer of famous brand products, authenticity is higher, they provide the parameters of the manufacturing process is guaranteed. If it is bulk purchase can completely to professional custom by using frequency antenna manufacturer, in order to obtain the best use effect. Base station antennas Base station antenna has a key role in the whole communication system, especially as the communication hub of communication stations. High gain antenna can not only increase the radio coverage area, and also to have certain of received signal amplification, can receive weak uplink signals better, improve the quality of mobile station and base station of wireless communication. Base stations are generally choose high-gain antenna, with the condition of the interference can be according to the actual situation considering adding narrow-band filter to reduce the influence of interference. Common base stations FRP antenna with omnidirectional basic no directional antenna, is suitable for base station location is located in the center of communication network. Due to glass fiber reinforced plastic antenna installation is easy, so widely used in various types of base stations. FRP antenna gain up to about 10 db, the higher the gain antenna is, the longer average gain for 5 to 6 db gain of FRP antenna on the length and the price is competitive, manufacturing technology is more mature, more. This kind of antenna in addition to the electrical properties, the quality of the outer FRP radome is there much difference, some bad products in the sun after a year of outer glass fiber reinforced plastic cracking would happen lead to scrap the whole antenna, some big brands of FRP antenna on quality more secure. Directional antenna is equivalent to the energy concentrated on multiple directions to one direction, has the characteristics of the main direction of radiation gain high, commonly used is yagi antenna. Yagi antenna unit number of the more its gain is higher, also suitable for point-to-point communication over a long distance and located at the edge of the network stations use. Suit is located in remote areas of directional contacts with the superior branch of police station, used properly the effect will be better than that of glass fiber reinforced plastic antenna. Sihuan array antenna is characteristic of large power, high gain, under direction gain adjustable, suitable for communication hub and the city bureau (bureau) and relay stations, but the price is quite high. 4th ring oscillator array antenna of four launch direction adjustable, when four oscillator interval of 90 degrees to install the basic characteristics of the antenna is omni-directional, when four vibrator all installed in the same direction when the directional antenna characteristics of gain in the main radiation direction at the same time to improve. The gain direction adjustable features can be used to better adapt to the rules of the service area. If sihuan array antenna gain is high enough to consider eight ring array antenna and its properties are similar to sihuan array but provides a higher gain. General 350 MHZ band sihuan array gain is 8 db (omnidirectional) / 10 db (orientation), eight ring array gain of 12 db (omnidirectional) / 15 db (orientation). 参考网址:http://www.crtegd.com/dgz-8.asp
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CXD SCIENCE&TECHNOLOGY
TEL: 86 755 83645483
MARKET:  86 755 28126706
FAX: 86 755 83281538
ADDRESS:F/6 Block A, Minlida Building, Honghualing Industrial Park, 1189 Liuxian Ave, Nanshan District, Shenzhen 518055, CN

CXD was founded in June 2002. It mainly engages in provision of wireless communication solutions as well as R&D, production, sales and services for advancedaccessories. The products include audio accessories, battery packs and chargers for most world-class brand communication equipment and apply to Public Safety, Navigation, Aviation, Commercial and urban rail transport.

 

CXD locates in Shenzhen, China with more than 500 long-term cooperation dealer partners across the China and the sales volume exceeding 10,000,000 and 6,000,000 pieces respectively for audio products and battery packs. In international market, its products and services are exported to 50+ countries & regions, including American(USA, Canada, Mexico, Chile and Brazil ext.), Europe (Germany, UK, Russiaand Holland ext.), Australia and Asia.

 

The R & D team of CXD occupies 20% of its total number of employees. This team, including a group of young and middle-aged scientists, masters, bachelors and other researchers, is one of the high-tech talent team with the largest number of R & D personnel and the strongest R & D strength in wireless communication accessories area in China. The products independently developed and manufactured by CXD offers complete and customized communication solutions for critical communication applications.

 

CXD implements strict internal quality control system to redound upon users with excellent quality. Its factory has passed ISO9001 management system certification and products have passed REACH, ROHS and CE certification. CXD always adheres to the principle of “Quality Products • Excellent Service”. It is striving for customers' highest satisfaction by providing products of maximum reliability together with high-class services. Its products are with competitive price and would be profitable for reselling!

In the next few years, CXD will continue to work in the specialized wireless communication area,dedicate itself to the development of more convenient and practical high-tech products toensure the reliability of communication, and develop itself into a world-renowned specialized and high-tech wireless communication company, so as to achieve its ultimate goal of “To be the best professional provider for wireless communication accessories”.

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