Channel 4 has started test transmissions for its high definition service on digital satellite.
The channel may be found at 12.188H at a symbol rate of 27.5 with FEC 2/3, and alternates between a black screen and a holding page.
In September, Channel 4 announced that it plans to launch Channel 4 HD on channel 140 in December. The channel will be located on channel 140, adjacent to Channel 4+1, E4, E4+1, More4 and More4+1. It will offer a high definition simulcast of its main service on satellite.
Channel 4 will be the first terrestrial broadcaster to offer a full-time high definition simulcast of its main service on Sky.