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Sk for transmission

Sketches of power supply technology. A motor triangulair connected, 3-fase power sines and a single fase sine.

We think the numbers are the decibel adjustments for the channels in a multiplex carrier wave system. Such a system makes it possible to put more calls on a single cable at the same time. But the text is written in English. Used by the Allies?

This equipment produces a lot of heat (radiotubes) and in other German bunkers with the same function, the height of the rooms is bigger, 3 or 3,5 meters. This Sk is normal, 2,3 meters. So, used by the Germans as a switching station and after the war used by the Allies as a multiplex carrier wave station ...