Kathrein UFD 570/S - Manual (Page 12)

Notes on Operation
12

is a switch-on button with menu functions. Press the button again
to exit. In channel list function: makes selected channel a favourite
channel.

is a function change button for radio and TV. In record mode:
preparation of recording. In channel list function: selects channel list
mode.

is a function change button. Press once again to change function.
Alphanumeric entries
Use the number buttons to enter the channel and network names.
They produce numbers and letters in the name fields of the
corresponding menus. Position the bar cursor on the name field. The
first position automatically assumes a dark background. You can now
also enter letters with the number buttons by pressing the
corresponding button several times. For example A, B and C are
additionally allocated to the "2" button (see following table).