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在大跨距电视节目传输中要充分发挥天线这种可靠的无源设备的作用,尽量提高天线增益来弥补长站距间电波的自由空间传播损耗,並努力拓宽馈源的频带宽度保证彩色电视节目的传输质量及增加传输节目容量,充分发挥其经济效益。本文还重点介绍了宽频带双极化馈源的设计原理和计算方法,调试步骤和质量指标。随后说明了天线系统总的测试过程及系统指标,並对大口径抛物面的设计指标也作了简要说明。
In the transmission of large-span television programs, it is necessary to give full play to the role of an antenna as a reliable passive device to maximize the antenna gain to compensate for the free space propagation loss of long-distance radio waves and strive to broaden the bandwidth of the feed to ensure that color television Program transmission quality and increase the capacity of transmission programs, give full play to their economic benefits. This article also focuses on the design principles and calculation methods, debugging steps and quality indicators of broadband dual-polarized feeds. Then the antenna system of the total test process and system indicators, and large-diameter parabolic design indicators are also briefly described.