Sending and receiving of radio wave for broadcast intended satellite. It is located on the geosynchronous orbit ground approximately 36,000km. The fact that presently it is used is "BSAT-1a/BSAT-2a". Besides the fact that with analog broadcastcentgiga of NHK, hi-vision broadcast, WOWOW and the music radio is broadcast, program of NHK and commercial broadcast each company is broadcast with digital broadcast.