NRK1 is the main television channel of Norwegian Broadcasting Corporation (NRK). Test broadcasts started on 12 January 1954, regular test broadcasts started on 13 April 1958 and regular broadcasts started on 20 August 1960. It is Norway's oldest and largest television channel. Previously known as simply as "NRK", the channel now known as "NRK1", to distinguish itself from sister channel "NRK2", which started broadcasting in 1996.