Jagdschloss radar

Jagdschloss Radar

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Jagdschloss radar

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Description:
Jagdschloss was a German early warning and battle control radar developed just prior to the start of World War II. Although it was built in limited numbers, Jadgschloss is historically important as the first radar system to feature a plan position indicator display, or "PPI". In Germany this display was referred to as "Panorama".

Development

The PPI effort started fairly early in the history of radar; Hans Hollmann filed a patent for the basic concept in 1936. At that time development of GEMA's other radars, notably the Freya, took priority, and work on the system did not start until 1939. By this time, radar development had progressed to the point were a prototype could be constructed by re-using systems from various production radars.

Just such a system was built south of Berlin, known as the Tremmen Radar Tower. It mounted a large antenna consisting of two rows of four half-wave dipoles aligned horizontally, rotating on a shaft located at the top of the tower. It was found that at least five pulses needed to be returned in order for the target to become visible on the scope, so the rotation rate of the antenna was adjusted to synchronize with the pulse repetition frequency of the radar. The radio equipment was taken from the Wassermann and Freya units, and operated on a basic wavelength of 2.4 m (~125 MHz).

Production units

Although the system demonstrated its utility, further units were not ordered until the fall of 1942, likely...
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