有线电视系统输出电平标准、频谱配置及故障检修  

CATV System Output Levels Standards, Spectrum Disposition and Troubleshooting

作　　者：周雷[1] 

机构地区：[1]江西教育学院,江西南昌330029

出　　处：《中国有线电视》2003年第14期67-69,共3页China Digital Cable TV

摘　　要：有线电视系统输出电平的调整非常重要 ,既要与电视机的入口电平相匹配 ,又要符合广播电视标准 ,即输出电平最小值为 6 0dB ,最大值为 75dB ,而网络常见故障有交互调干扰、重影干扰、交流滚道干扰、本振干扰和雪花干扰等 。It is important to adjust output levels of cable television system,Which should not only match the input levels of TV. But also measure up the standards of broadcast and television, that is the minimum of output levels is 60 dB, and the maximum is 75 dB.The common troubles are the interference of alternation modulation, ghost image, hum trundling, natural oscillation and snowstorm.It is essential knowledge for the safeguard of cable television to grasp the overhauling technique of these interferential troubles.

关 键 词：有线电视 输出电平标准 频谱配置 故障 检修 交互调干扰 重影干扰 交流滚道干扰 本振干扰 雪花干扰 

分 类 号：TN943.6[电子电信—信号与信息处理]