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北方地区CATV系统因受环境温度影响严重，多数地区在设计时对环境温度影响欠考虑，系统稳定性差。所以在设计CATV系统环境温度也是一个重要指标，对环境温度引起的电平波动进行讨论。
Due to the serious influence of ambient temperature on the CATV system in northern China, the influence on the ambient temperature in most areas is not considered and the system stability is poor. Therefore, the design of the CATV system ambient temperature is also an important indicator of the temperature fluctuations caused by the ambient temperature are discussed.