Westar 1 was used by Western Union for its own internal communications, such as for sending telegrams and mailgrams to Western Union bureaus and U.S. post offices respectively. It also was utilized by outside customers such as PBS, NPR and the Mutual Broadcasting System, using it for sending television and radio programming via satellite to their local affiliate stations throughout the 1970s and '80s. Westar 1 was also used for a short time by HBO for its nationwide debut using satellite distribution to cable companies in 1975 (HBO later moved to RCA's competing satellite, Satcom 1, in February 1976).
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