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一、覆盖场强收测的必要性由于各个电视发射台服务区地理条件、天线高度、天线型式、天线层数、天线水平面场型、主、分馈线的粗细、长短以及天线与馈电系统匹配的优劣、发射功率等级等因素的不同,很难对电视发射天线的服务半径做出统一的规定。通常在理想的平原开阔地带,发射天线中心离地有效高度为h_1=100m,四层蝙蝠翼天线阵增益G=6.2dB,馈电系统总损耗L≤3dB,全向水平场型,电视发射机输出功率为1kw,接收天线中
First, the coverage of the need to cover the field strength As the service area of each TV launch pad geographic conditions, antenna height, antenna type, antenna layer, antenna level field type, the main, sub-feeder thickness, length and antenna matching with the feed system The advantages and disadvantages of the transmitter power level and other factors, it is difficult to make a uniform service radius of the TV transmitting antenna. Usually in the ideal plain open area, the effective height of the transmitting antenna center is h_1 = 100m, the gain of the four-layer bat wing antenna array is G = 6.2dB, the total loss of the feeding system is L≤3dB, the omnidirectional horizontal field type, the television transmitter Output power of 1kw, receiving antenna