To Municipal Radio Transmission And Coverage System Design And Practice - Transmission, Coverage,
Of: Chen Kejun Chengde City, Hebei Broadcasting and Television Bureau
Abstract radio face the new situation and needs, should be how to use the comprehensive advantages of the various radio and television, as to set appropriate combination of actual and reasonable construction to municipal radio transmission and coverage of the network, this paper suitable for city level and coverage of radio transmission method in the characteristics and system selection, design and technology solutions practice.
Key words radio coverage design cities
1. Overview Reasonable construction of the transmission of radio signals and the overlay network can maximize the technological advantages of radio stations, as in the municipal radio station of their economic status, geographical location, population distribution, industry regulations, etc. in certain conditions decide the pace of development of local broadcasting system and the form of transmission coverage and satellite coverage means present, for the municipal radio stations concerned, the cost of the broadcast coverage, cost, technology, and not very practical application within a short time is difficult to . Internet web-casting to cover the present stage of development, with economic development and digital technology in broadcasting system applications, can be gradually realized in the municipal radio webcast, but it is impossible in the short-term alternative to traditional means of radio receivers, only the traditional broadcast network extension and supplement of the world. So to use the municipal radio AM, FM launches wireless coverage is the main cover, using cable networks, radio signals is the main means of transmission.
1. Cover structure To municipal radio coverage by administrative regions and population distribution can be divided into three coverage levels, covering the city, towns and villages covered by cover. City coverage should be wireless transmitters, cable TV distribution network forms of radiation, while buses and other small-scale establishment of a fixed receiver sites, cities and towns covered by the form than outside, and then set up in towns and villages covered by the fixed reception facilities. To transfer the development of village-based cable, cable users emission (radiation) method supplemented by coverage.
2. Development requirements To municipal radio technology to develop gradually to the following:
(1) System Digital: Query in the program, collecting, organizing, listening to the trial, call the realization of programs such as digital recording, digital editing, digital storage and sharing of digital audio programming and other automated functions, and gradually to the realization of the digital broadcasting system.
(2) broadcast automation: In the broadcast, and management through the use of digital audio workstation systems, can greatly improve the safety and reliability of broadcast systems and technology indicators, accelerating the process of digital radio.
(3) Transmission Network: The establishment of computer local area network interconnection system for broadcast radio inside information, data, interaction and resource sharing programs, the external transmission of the signal, full use of cable television networks and radio transmission audio transmission.
(4) launch Solid State: Gradually update the original tube transmitters, all-solid-state transmitter. Transmission equipment can significantly improve the technical specifications and system stability and can reduce launch costs.
(5) covering diverse: Single change in the original form of wireless transmitter mode, using cable radiation, space launch wireless Internet and other interactive multi-channel, multi-form coverage system, each other each other.
Light of the above requirements, we give full consideration to the Chengde is located in the mountainous geography and electromagnetic environmental conditions, economic development, population distribution, based on the actual according to Chengde in Chengde City, designed and implemented the transmission of radio cover technology systems.
General principle is to use cable transmission, cable radiation, wireless transmitters, using built alpine terrain high-power FM transmitter, county building low-power FM transmitter, wireless complement to wired links, AM, FM launched more forms to achieve full three-dimensional coverage.
2. Signal transmission system 1. Basic Chengde city is divided into booming, Luanping, Longhua, paddock, Kuan, Hiraizumi, Fengning, Chengde County, eight counties and Shuang Luan, double bridge, camp sons and three areas, urban areas located in Shuangqiao District. Total population of 3.4 million, with a total area of 40,000 square kilometers, of which the urban area of 18.6 square kilometers, Chengde is now broadcast on two radio broadcasts, the first set of programming FM frequencies 89.1MHz, 93.8MHz; AM frequency 1584KHz; Cable FM frequency of 103MHz. The second program FM frequency 97.6MHz, modulation frequency of 900KHz, wired FM frequency 99MHz.
2. Audio signal transmission channels Broadcast by the radio control room sent two sets of stereo audio signals via radio signals splitter output 5:
(1) sent to the FM Radio Transmitter Room to achieve FM signal in the urban center of emission.
(2) sent by the microwave transmitter room microwave transmission to 150 km away, Xinglong County, Wuling Mountain, the realization of high-power FM radio signal coverage launch.
(3) transmitted by cable to 3 kilometers from the city cable network company, after the front room, divided into two-way: all the way into urban cable network cable to achieve convergence of urban radio signal (fat) fire; Another way transport to the various counties of the cable TV front room radio signals to achieve convergence of County network cable (fat) fire. At the same time, it is distributed in all counties to provide low-power FM transmitter signal source, launched coverage of small-power FM.
(4) The optical transmission to 1.2 km away AM station in the city room to achieve the AM radio signals (AM) Centre launched.
(5) sent to the audio acquisition system for the future implementation of the Internet to provide online radio signal source.
3. Wireline network traffic and coverage
Chengde county area has all the fiber-network basis can make full use of existing transmission system to implement the transmission of radio signals and coverage.
(1) urban parts: Will be sent to the City Networks, the front room of the audio signal, modulated by the cable network into the city to complete the city's FM radio signal cable coverage. Also, can set up an independent channel (frequency), as hotels, restaurants, stations, background music and the timely provision of voice broadcasting.
(2) County sections: The front room into the City Internet companies before the signal modulation by cities and counties in the SDH transmission network to the county district after the cable TV front room divided into two roads,
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