目前许多国家都在考虑和蕴酿12千兆赫频段用作个体家庭和集体接收的卫星直接电视广播问题。但是因为一般要求卫星发射机的功率达到100～450瓦的量级,而致使这一设想的实现进展比较缓慢。加拿大标新立异,大胆地首先提出采用低功率转发器作直接电视广播,它的这种与众不同的想法并不是凭空设想的,而是建立在扎实的实验基础上提出的。加拿大和美国联合发射的12/14千兆频段的CTS卫星经过了为时三年多的试验和测量,其中6个月就是专门对7个地面小终端进行直接广播。在CTS工作的第四年,它又从116°W移到了142°W对澳大利亚境内的低成本地面终端作了非常成功的电视广 At present, many countries are considering and imposing 12-gigahertz bands for the issue of satellite direct television broadcasting for individual families and collective reception. However, as the power of satellite transmitters is generally required to reach the order of 100-450 watts, the realization of this concept has been slow. Canada’s unconventional, bold first to propose the use of low-power transponders for direct television broadcasting, its unique idea is not imagined, but based on a solid experiment put forward. The 12/14 Gigahertz CTS satellite jointly launched by Canada and the United States went through more than three years of testing and measurement, of which six were dedicated to the direct broadcast of seven small land-based terminals. In the fourth year of CTS’s work, it has moved from 116 ° W to 142 ° W. It has had a very successful television coverage of low-cost terrestrial terminals in Australia