Posted: Wed Dec 21, 2011 3:26 amAs I know the testcards were used for the 180 lines and 441 lines systems. For mechanical television and early electronic TV the "Reichspost" used a testfilm with two young ladies, singing "horch, was kommt von draußen rein". Unfortunally I was not able to find that film, it was shown on TV many years ago in a documentation about television. I have this screenshot of that film: