论文部分内容阅读
以消除环境反射重影为主要目的的圆极化电视广播在美国正处在逐步推广的阶段。从1977年6月到1978年9月,有六个甚高频台和两个特高频台改建成圆极化波发射台,另外还
A circularly polarized television broadcast aimed at eliminating environmental reflections and ghosting is in the United States at a stage of gradual promotion. From June 1977 to September 1978, there were six VHF stations and two UHF stations converted into circularly polarized transmitters. In addition,