sentences:  Further technical improvements were made on 9 May 1973, when the first regular broadcasts in colour started on TV2, followed two years later by colour transmission on the first channel as well.At the end of the decade, in 1979, a building and a studio based in Prague's Kavčí hory was opened, which became the home of ČST's news department.After November 1989, lineup changes were made, with the first program being renamed F1 for the federal district, and the second program being split into the Czech ČTV and the Slovak S1, the first such division of channels by ČST.