the early radio-location progress at the LPTI and NII-9. He started a research program in this technology at the NIIIS-KF, but was interrupted by being arrested in 1937 during the Great Purge and spent three years in prison. Berg was released in early 1940 and reinstated in his positions. After reviewing the tests of Redut conducted at Sevastopol, he obtained a RUS-2 cabin and had it adapted for shipboard testing. Designated Redut-K, it was placed on the light cruiser Molotov in April 1941, making this the first warship in the RKKF with a radio-location capability. After the start of the war, only a few of these sets were built. In mid-1943, radar (radiolokatsiya) was finally recognized as a vital Soviet activity. A Council for Radar, attached to the State Defense Committee, was established; Berg was made Deputy Minister, responsible for all radar in the USSR. While involved with all future developments in this activity, he took special interest in Navy systems. Berg was later mainly responsible for introducing cybernetics in the Soviet Union. Other indigenous Soviet Navy radars developed (but not put into production) during the war included Gyuis-1, operating at 1.4 m with 80- kW pulse power. This was a successor to Redut-K for early warning; the prototype was installed on the destroyer Gromkii in 1944. Two fire-control radars were simultaneously developed: Mars-1 for cruisers and Mars-2 for destroyers. Both were tested just at the close of the war, and later placed into production as Redan-1 and Redan-2, respectively. Germany Germany has a long heritage of using electromagnetic waves for detecting objects. In 1888, Heinrich Hertz, who first demonstrated the existence of these waves, also noted that they, like light, were reflected by metal surfaces. In 1904, Christian Hülsmeyer obtained German and foreign patents for an apparatus, the Telemobilskop, using a spark gap transmitter that could detect ships and prevent collisions; this is often cited as the first radar, but, without directly providing range, it does not qualify for this classification. With the advent of the radio tube and electronics, other detection-only systems were developed, but all used continuous waves and could not measure distance. In 1933, physicist Rudolf Kühnhold, Scientific Director at the Kriegsmarine (German Navy) Nachrichtenmittel-Versuchsanstalt (NVA) (Signals Research Establishment) in Kiel, initiated experiments in the microwave region to measure the distance to a target. For the transmitter, he obtained assistance from two radio amateur operators, Paul-Günther