History
Seven HD was officially announced on 15 September 2007, with the Seven Media Group announcing their intention to start a high definition multichannel, that was initially expected to launch in December 2007. However, Seven HD became the first Free-to-air commercial television channel introduced to metropolitan areas since 1988, when it launched prior on 15 October 2007, with 25th Hour being the first program broadcast at 10:30pm.
The channel replaced the Seven Network's existing high definition service, a simulcast of its standard definition and analogue services, known and branded as '7 HD Digital'. Due to an amendment of the Broadcasting Services Act 1992 in 2006, the Broadcasting Legislation Amendment (Digital Television) Act 2006, television networks are now permitted to launch digital multichannels, provided that they are broadcast exclusively in high definition. The channel expanded its broadcast schedule on 10 December 2007 to include daytime programming which had previously been a full simulcast of the main channel. Seven HD breakaway programming ceased transmission on Sunday 4 October 2009 in preparation for the launch of 7TWO a few weeks later on 1 November. Seven HD then returned to being a high definition simulcast of Seven, before finally being replaced by 7mate on 25 September 2010.
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