3d printed in Grey
25mm x13 x 13
The Freya was a ground-based radar operating around 2.4 m (125 MHz) with 15-kW peak power giving a range of some 130 km. The basic Freya radar was continuously improved, with over 1,000 systems eventually built.
In 1940, Josef Kammhuber used Freyas in a new air-defense network extending through the Netherlands, Belgium, and France. Called the Kammhuber Line by the Allies, it was composed of a series of cells code-named Himmelbett (four-poster bed), each covering an area some 45 km wide and 30 km deep, and containing a radar, several searchlights, and a primary and backup night-fighter aircraft. This was relatively effective except when the sky was overcast. A new gun-directing radar was needed to cover this deficiency and the Luftwaffe then contracted with Telefunken for such a system.
Under the leadership of Wilhelm Runge, the new radar was built by Telefunken around a new triode capable of delivering 10-kW pulse power at 60 cm (500 MHz). Code-named Würzburg (the leading engineer Runge prefers code-names of German cities like Würzburg), this had a 3-m (10-ft) parabolic reflector supplied by the Zeppelin Company and was effective at a range of about 40 km for aircraft. Two of these radars were normally added to each Himmelbett, one to pick up the target from a Freya and a second to track the fighter aircraft. Requiring only one operator, the Würzburg came to be the primary mobile, gun-laying system used by the Luftwaffe and Heer during the war. About 4,000 of the various versions of the basic system were eventually produced.
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