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近几年随着广播电视技术的发展,特别是数字压缩技术的发展,国内许多电视台纷纷采用数字压缩技术,通过卫星覆盖全国,而早期上星的几个省的模拟节目也逐步数字化,因此在不远的将来,卫视节目将要全部数字化,而数字卫星节目接收又不同于模拟节目接收,笔者在接收数字卫星节目过程中遇到过许多故障现象,现加以归纳总结。 故障1:本台收转安徽卫视,开始一切正常,某一天接收机显示安徽台无卫星信号,打开接收机信号强度菜单,显示无信号质量,约十五分钟后信号自动恢复,第二天大约同一时间又出现同一现象,而此时其他台正常接收。经检查发现功分器工作不稳定。 故障2:广东卫视某一天显示无卫星信号,打开接收机信号强度菜单,显示无信号质量,大约半小时后信号自动恢复,经检查发现高频头为1993年买嘉顿28°高频头,换一新高频头后一切正常,可见是高频头工作年限太长而不稳定了。
In recent years, with the development of radio and television technology, especially the development of digital compression technology, many television stations in China have adopted digital compression technology to cover the whole country via satellite. In the early days, simulation programs in several provinces of the previous star were gradually digitized. In the near future, all satellite TV programs will be digitized, and digital satellite programs are received differently from analog TV programs. The author has encountered many problems during the reception of digital satellite programs. Now it is summarized. Fault 1: The station closed Anhui Satellite TV, began all normal, one day the receiver shows Anhui satellite without satellite signal, open the receiver signal strength menu, showing no signal quality, about 15 minutes after the signal automatically resumes, the next day about The same phenomenon occurs again at the same time, while other stations normally receive this time. After the inspection found that splitter work is not stable. Fault 2: Guangdong Satellite TV one day showed no satellite signal, open the receiver signal strength menu, showing no signal quality, about half an hour later the signal automatically resumes, the inspection found that the tuner in 1993 to buy Dayton 28 ° tuner, After a new high-frequency head for all normal, we can see that the working frequency of the tuner is too long and unstable.