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一、绪言 1978年4月日本发射的广播实验卫星,现正在进行各种传输试验,并为将来实现卫星广播进行准备工作。同时,还准备逐渐开始地面上的超高频(SHF)广播。上述广播是在11.7千兆赫至12.2千兆赫的超高频频段上进行的。这个频段较之历来的甚高频(VHF)和特高频(UHF)频段要高得多。在这样一
I. INTRODUCTION The radio experimental satellites launched by Japan in April 1978 are now undergoing various transmission tests and preparations for satellite broadcasting in the future. At the same time, it is also preparing to gradually start broadcasting terrestrial ultra-high frequency (SHF) broadcasts. The above broadcast was conducted on the UHF band from 11.7 GHz to 12.2 GHz. This band is much higher than the previous VHF and UHF bands. In this one