Used for amateur radio communication. This test contains the international testsentence: "the quick brown fox jumps over the lazy dog 1234567890 times". And one line ryryr. This test is often run when establishing a reconnection between two stations. The sentence contains all letters and numbers. The ryryr- line is used for testing the correct speed and synchronisation. ryryr represents the maximum of changes. this means 01010 10101. when this is decoded clean the possibility of establishing a good connection between two stations would be nearly 100%.This was very important as mechanical typewriters were used. The speed is 75Baud or 50Bd.