RuudNL said:The first knob is "km Leitunglänge" (=line length) in km in 2 km steps. (0-14 km.)
The second knob is a finer "Leitungslänge" control, in 0.5 km steps (0-2 km.)
The third knob is for compensation of the line loss ("Leitungsdämpfung", 0-5 dB)
It seems to be a line amplifier used by a broadcasting station or PTT to compensate the losses in long lines.
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