An investigation group for European new radio and TV technologies headed by Guo Yansheng, Director of Department of Science & Technology, SARFT, visited Paris, Rome and other places in early September, 2002. It ma...An investigation group for European new radio and TV technologies headed by Guo Yansheng, Director of Department of Science & Technology, SARFT, visited Paris, Rome and other places in early September, 2002. It made on-the-spot investigation of the latest development of radio and TV technologies and the production and main products of relevant manufacturers in Europe, and also made an extensive investigation and exchange of practical applications.展开更多
短波发射机在工作过程中一般会因季节的变化或工作对象的需要不断改变其工作频率 ,另外也会因为元器件老化或变质而使发射机的工作状态或技术指标发生变化 ,因此对短波发射机必须进行及时的技术维护。本文叙述了短波发射机的一些基本维...短波发射机在工作过程中一般会因季节的变化或工作对象的需要不断改变其工作频率 ,另外也会因为元器件老化或变质而使发射机的工作状态或技术指标发生变化 ,因此对短波发射机必须进行及时的技术维护。本文叙述了短波发射机的一些基本维护原则 ,并以SW10 0 A/ B 10 0 k W PD展开更多
文摘An investigation group for European new radio and TV technologies headed by Guo Yansheng, Director of Department of Science & Technology, SARFT, visited Paris, Rome and other places in early September, 2002. It made on-the-spot investigation of the latest development of radio and TV technologies and the production and main products of relevant manufacturers in Europe, and also made an extensive investigation and exchange of practical applications.
