Description of the radar set, tactical-technical characteristics
Figure 1: „Wassermann M” Silhouette
GES. FÜR ELEKTROAKUSTISCHE U.
MECHANISCHE APPARATE M.B.H.
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The “Wassermann” (Engl.: “Aquarius”) radar (FuMG 404) was a rotating search radar developed by Siemens since 1940. The “Wassermann” radar was derived from the Freya “elevator” test radar, in which the antenna on a steel mast could be raised and lowered to measure height. Since this was a time-consuming process, several antenna arrays were later mounted one above the other, which could now be quickly switched alternately to the transmitter/receiver.
The antenna consisted of a stationary rotatable lattice mast (later round mast) of 37 to 60 meters height. To this mast were attached retaining frames of 4 to 12.4 meters width, to which initially only 4 Freya antennas were attached. By variations of the antennas the aperture angle of the antenna and the range of the radar were substantially affected. The antenna mirror consisted of four fields with up to 144 dipoles. In detail the antennas were composed of
- “Wassermann L” (light) from 12 lines with 6 dipoles each, (36 m high guyed scaffold)
- “Wassermann M” (medium) consisting of 12 rows with 8 dipoles each (36 m high cantilevered tower) and
- “Wassermann S” (heavy) consisting of 12 lines with 12 dipoles each (up to 60 m high guyed tower).
For long range target acquisition the two upper mirror quarters are switched on, for low level target acquisition the two lower ones. The uppermost dipole line belonged to the “Gemse” identification device (interrogator).
About 7 soldiers were needed to operate the radar.
Figure 2: Control panel and display units of the “Wassermann” device