The cavity magnetron was the answer the U.S. was looking for, and it led to the creation of the Two other organisations were notable. It was almost a year after the start of the war, however, before the first airborne set was developed at the Oppama Naval Air Technical Depot (ONATD). They were going to give the first radars and sonars (ASDIC and hydrophones), Huff-Duff Localization trigonometric) of the fleet, and thus a decisive advantage at the beginning of the war. At Toshiba, the project was also for a target-tracking system designated Tachi-2. Type 285 with six element Yagi antenna with separate Tx / Rx. Preliminary tests showed that it would be too fragile for field operation; this project was also abandoned. This was for a ground-based tracking radar, again using the SCR-268 as a pattern. In mid-1943, the greatly improved Although Telefunken had not been previously involved with radars of any type for fighter aircraft, in 1944 they started the conversion of a In the years prior to World War II, Japan had knowledgeable researchers in the technologies necessary for radar; they were especially advanced in magnetron development. Although both the NRL and SCL had experimented with 10–cm transmitters, they were stymied by insufficient transmitter power. At the outbreak of war in September 1939, both Great Britain and Germany had functioning radar systems. The greatest developmental problem was in bringing the weight down to that allowable for an aircraft; 110 kg was eventually achieved. Another similar system was the Type 21. ^ Horan, Mark E. "With Gallantry and Determination" The Story of the Torpedoing of the Bismarck Archived 1 December 2007 at the Wayback Machine The first successful airborne microwave radar. However, a lack of appreciation of radar's potential and rivalry between army, navy and civilian research groups meant Japan's development was slow. From their intelligence sources, the Soviets were aware of Britain's gun-laying RDF (It indeed had gone to Moscow – directly to NII-20 and Factory 339, where intelligence experts gave it a total examination and Sliozberg led a team in quickly Ukraine had been the third objective of the invading German Army. Another was the Type FM-3; operating at 2 m (150 MHz) with 2-kW peak-power, this weighed 60 kg and had a detection range up to 70 km. The beams were about 30 degrees wide, but the azimuth of the reflected signal was determined more precisely by using a Before the end of the year, a full system had been assembled and detected a water tank at a distance of about 8 km. Intended for both air- and surface-search, the Type 64 operated at 2 m (150 MHz) with a peak power of 3 to 5 kW and a pulse width of 10 ms. TTRI was staffed with competent personnel, but most of their developmental work was done by contractors at the research laboratories of Toshiba Shibaura Denki (The TTRI established a system for designating the Army radar equipment, based on its use. Both the transmitter magnetron and front-end portions of the receiver were in sealed containers attached to the rear of the reflector. Under the leadership of The most ambitious, long-term effort of the Rad Lab was The Alvarez antenna was also used in developing the Although not implemented into a full system until after the war, the To examine current and proposed detection methods, a meeting was called by the At the SCB, Oshchepkov's team developed an experimental pulsed radio-location system operating at 4 m (75 MHz.). The Type 285M could provide accurate ranges via the mechanical ranging panel, L12, and bearing information using lobe switching, but height finding was primitive and had to be calculated using maximum signal indication. Although many companies manufactured sets, only Bell Telephone Laboratories (NTL) had major involvement in development. The primary difference was that the As the Allies progressed upward in the Pacific, a need arose for a long-range warning set that could be quickly set up following an invasion.
The first Japanese warships with microwave radar received these in March 1942, and by late 1944, microwave radar was widely in use on surface vessels and submarines; about 300 Type 22 sets were built. It was similar to its predecessor but lighter in weight (about 6,000 kg) and on a movable platform. The lower power significantly reduced the range. The need, however, for an airborne radio-location set was now even more important; the The antennas were mounted above the top surface of the wings, a broad-pattern transmitting array on one wing and two Yagi receiving antennas on the other. The RDL took this as a project in late 1942, and in few months six From the start in late 1939, 117 radar sets of all types were built in New Zealand, all by small groups; no types were ever put into serial production. The duplication of this system was found to be too difficult, and Tachi-1 was soon abandoned. Rather than releasing the prototype for production, the Army made arrangements for the Tests aboard a ship showed aircraft detection at 60 km and reliable measurement starting at 40 km. The receiver was super-regenerative, using type 955 and 956 Acorn tubes in the front end and a 9-MHz IF amplifier. From this came the Tachi-3, a ground-based tracking radar. Designated FD-2 (sometimes FD-3), this was a magnetron-based, 25-cm (1.2-GHz), 2-kW set weighing about 70 kg. The controls and PPI display was in a nearby fixed building. There was no provision, however, for feeding this information into an automatic unit for aiming searchlights and guns. It could detect aircraft at a range between 0.6 and 3 km, satisfactory for close-range night-fighter aircraft such as the When magnetrons were being developed in Japan, the initial primary application was intended to be power transmission, not radar. Each of these had a hand-rotated pole with Yagi antennas at two levels, allowing azimuth and elevation measurements.
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