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本文从有线电视系统交扰调制比和回波值的定义出发，分析了CM回波值的测量方法，在缺乏直接测量这二项技术指标仪器的情况下，找到了利用现有仪器测量CM和回波值的方法。
Based on the definition of crosstalk modulation ratio and echo value in CATV system, this paper analyzes the measurement method of CM echo value. In the absence of the direct measurement of these two technical indicators, Echo value method.