The invention relates to a process and a device for the generation of coaxial lines of identical electrical length. A measuring device determines the differential delays of electrical signals in a reference coaxial line and in the coaxial line to be measured and processed. The corresponding physical length resulting from this is calculated for the coaxial line to be processed. The measuring device controls directly the cutting device for positioning and cutting the coaxial line to be processed to a physical length which corresponds to the conversion value calculated by the measuring device in relation to the two coaxial lines. A path length measuring device assigned to the cutting device controls the end of the positioning operation and the...