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中波广播发射天线的辐射场强与天线形式、发射频率、地网优劣、匹配好坏、地导系数、传播路径、地形地貌等诸多因素有关。笔者从中波发射天线的基本构成和传播原理入手,详细分析了影响天线辐射效率和中波场强的主要因素,阐述了维护和保护好中波发射天线、天调网络、馈线、地网等设施的重要性和必要性。现在许多中波发射台面临搬迁,在发射台选址、天线选型时要尊重科学,要从广播的覆盖效果和城市电磁环境等因素综合考虑,要兼顾社会效益和经济效益。
The radiation field strength of the medium-wave broadcasting transmitting antenna is related to many factors such as the form of the antenna, the transmitting frequency, the advantages and disadvantages of the grounding grid, the matching quality, the conductivity factor, the propagation path, topography and topography. The author starts from the basic composition and propagation principle of the transmitting antenna of China Wave, analyzes the main factors affecting the radiation efficiency and the medium wave field strength of the antenna in detail, and elaborates on the maintenance and protection of medium wave transmitting antenna, day tune network, feeder line, ground network and other facilities The importance and necessity. At present, many medium wave launching stations are facing relocation. When selecting the location of the transmitting station and choosing the antenna, science should be respected. From the broadcasting coverage and the electromagnetic environment of the city, the social and economic benefits should be balanced.