Here you will find information regarding the FM 1800/11200 amplifier unit of Siemens.

It contains a RW 1125 TWT, a High Voltage converter, detector amplifier and circulator. The schematics of the unit were to large for my scanner, so the scans were placed side by side.

Schematics can be downloaded in a small or large version. Just right-click on the picture and save to copy the small version on your PC. If you want the large, detailed one, left click on the picture, allow it to down load (approx 1.8 Mb) and right click to save it locally.

Power amplifier



High voltage converter




High voltage unit measurements



Detector amplifier