The Pacific War Online Encyclopedia
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|Range||25 miles (40 km) aircraft
||Transmitter: 5 element Sterba
ground array of individual dipoles at 20 feet (6 m) elevation
Receiver: five horizontal dipoles in diamond array
|Production|| About 150 sets from 1943
The Tachi-3 was a land-based radar. It was known in prototype as the Mark Ta Model 3 (Chijo-yo Dempa Hyotei-ki, 3-gata) and was based in part on a captured British Mark II gunlaying radar from Singapore. Like many Japanese radars, it used separate transmitter and receiver antennas. The transmitter could be electronically steered in altitude but was mechanically steered in azimuth. The receiver used five separate dipole antennas, four of which employed lobe switching to determine altitude and azimuth while the fifth was used to determine range. Each set controlled six 120mm and six 88mm antiaircraft guns.
It was plagued by interference from ground reflection and had poor resolution. As a result, it was to be replaced by Tachi-24, a Japanese version of the German Würzburg, but the war ended before the latter could go into mass production.
It was deployed only to Formosa and the home islands
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