Verstaerkerkasten Vstk 65a amplifier, part of Wurzburg Fuse 65 radar

"Verstaerkerkasten" Vstk 65a amplifier, part of turning and tilting gear of Wurzburg Fuse 65 radar. Geraet [Equipment] number: 124-5384B. Werk [Serial] number: 211772.

Due to weight of the turning part of the radar (about 13.3 tons), the laying gear had to be power operated and use was made of an AEG-desogned Ward Leonard system. The two DC driving motors for azimuth and elevation were fed by two DC generators which were driven by one three-phase AC mains motor. The exitation of the DC generators was controlled by thyratron amplifiers which were fed with the different voltage between the rotors of two selsyns, one coupled to the paraboloid, the other coupled to the handwheel on the control column for either azimuth or elevation.

The parabola was thus driven until the difference voltage between the rotors of the two selsyns was nil and hence the parabola followed all movement of the control selsyn. Scales, coupled to the control selsyns, indicated the bearing and elevation.