Of: Chen Kejun Chengde City, Hebei Broadcasting and Television Bureau
Abstract radio face the newest situation and needs, ought to be how to use the comprehensive benefits of the various radio and tv, regarding set appropriate mixture of actual and reasonable construction to municipal radio transmission and protection associated with system, this paper suitable for city level and protection of radio transmission method within the faculties and system selection, design and technology solutions training.
Keywords radio coverage design urban centers
1. Overview Reasonable construction associated with the transmission of radio signals as well as the overlay network can maximize the technological advantages of radio channels, as in the municipal radio station of these financial status, geographical location, populace circulation, industry laws, etc. using conditions decide the rate of growth of local broadcasting system additionally the as a type of transmission coverage and satellite protection means present, for the municipal radio stations stressed, the price of the broadcast protection, cost, technology, and never very program within a few days is hard to . Internet web-casting to cover the present stage of development, with economic development and electronic technology in broadcasting system applications, are slowly recognized within the municipal radio webcast, but it is impossible into the short-term alternative to old-fashioned way of radio receivers, only the traditional broadcast system extension and health supplement of the world. So to use the municipal radio AM, FM launches cordless coverage is the main address, utilizing cable companies, radio signals is the primary means of transmission.
1. Cover structure To municipal radio coverage by administrative areas and population distribution is divided into three protection amounts, covering the town, towns and villages covered by address. City protection is wireless transmitters, cable TV distribution system kinds of radiation, while buses alongside small-scale establishment of a set receiver internet sites, cities and towns covered by the proper execution than outside, and create in towns and villages included in the fixed reception facilities. To move the development of village-based cable, cable users emission (radiation) technique supplemented by protection.
2. developing requirements To municipal radio technology to develop slowly towards the following:
(1) System Digital: Query into the system, gathering, organizing, listening to the trial, phone the realization of programs such as for example digital recording, electronic modifying, digital storage and sharing of electronic audio development as well as other automatic functions, and gradually towards understanding regarding the digital broadcasting system.
(2) broadcast automation: In the broadcast, and administration through the use of digital sound workstation systems, can greatly enhance the safety and reliability of broadcast systems and technology indicators, accelerating the process of electronic radio.
(3) Transmission system: The establishment of computer geographic area network interconnection system for broadcast radio inside information, information, connection and resource sharing programs, the external transmission associated with the signal, complete utilization of cable television networks and radio transmission audio transmission.
(4) launch Solid State: Gradually upgrade the first pipe transmitters, all-solid-state transmitter. Transmission equipment can notably enhance the technical specifications and system security and may reduce launch costs.
(5) covering diverse: solitary change in the initial as a type of wireless transmitter mode, using cable radiation, space launch wireless Web alongside interactive multi-channel, multi-form coverage system, each other both.
Light associated with above requirements, we give complete consideration toward Chengde is located in the mountainous geography and electromagnetic ecological conditions, economic development, populace circulation, based on the real based on Chengde in Chengde City, designed and implemented the transmission of radio cover technology systems.
General concept is by using cable transmission, cable radiation, cordless transmitters, making use of built alpine landscapes high-power FM transmitter, county building low-power FM transmitter, wireless complement to wired links, AM, FM established more kinds to achieve full three-dimensional protection.
2. Signal transmission system 1. Basic Chengde town is divided into booming, Luanping, Longhua, paddock, Kuan, Hiraizumi, Fengning, Chengde County, eight counties and Shuang Luan, dual bridge, camp sons and three areas, cities positioned in Shuangqiao District. Total populace of 3.4 million, with an overall total section of 40,000 square kilometers, which the metropolitan part of 18.6 square kilometers, Chengde is currently broadcast on two radio broadcasts, initial group of programming FM frequencies 89.1MHz, 93.8MHz; AM frequency 1584KHz; Cable FM regularity of 103MHz. The second system FM frequency 97.6MHz, modulation regularity of 900KHz, wired FM regularity 99MHz.
2. sound signal transmission stations Broadcast by the radio control space delivered two sets of stereo audio signals via radio signals splitter production 5:
(1) provided for the FM Radio Transmitter Room to accomplish FM sign within the metropolitan center of emission.
(2) delivered by the microwave oven transmitter room microwave transmission to 150 kilometer away, Xinglong County, Wuling hill, the realization of high-power FM radio sign protection launch.
(3) sent by cable to 3 kilometers from the city cable community company, after the living room, split into two-way: all the way into metropolitan cable network cable to obtain convergence of urban radio signal (fat) fire; Another way transportation towards the various counties of satellite tv living room radio signals to obtain convergence of County community cable (fat) fire. On top of that, its distributed in every counties to offer low-power FM transmitter signal source, launched coverage of small-power FM.
(4) The optical transmission to 1.2 kilometer away AM place into the city space to attain the AM radio signals (have always been) Centre established.
(5) delivered to the audio purchase system for the future utilization of the Internet to supply on the web radio sign source.
3. Wireline system traffic and protection
Chengde county area has all of the fiber-network foundation could make full utilization of existing transmission system to implement the transmission of radio signals and protection.
(1) metropolitan parts: will undoubtedly be delivered to the City Networks, leading room of the sound signal, modulated by the cable community to the town to complete the city’s FM radio signal cable coverage. Additionally, can setup an unbiased channel (regularity), as accommodations, restaurants, stations, back ground music together with prompt supply of voice broadcasting.
(2) County sections: the leading space in to the City Internet companies ahead of the signal modulation by cities and counties in the SDH transmission network towards county region after the cable television front room divided in to two roadways,
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