 | This article is substantially duplicated by a piece in an external publication. Since the external publication copied Wikipedia rather than the reverse, please do not flag this article as a copyright violation of the following source: - Miller, F. P., Vandome, A. F., & McBrewster, J. (2010), Digital radio: Radio communications, digital modulations, Voyager program, Deep Space Network, television broadcasting, wireless communication, Alphascript Publishing
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