The Pacific War Online Encyclopedia
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| Wavelength |
385 cm |
| Pulse width |
1-5 microseconds |
| Pulse repetition
frequency |
1875 Hz |
| Power |
50 kW |
| Range | 25 miles (40 km) aircraft |
| Antenna |
Transmitter: 5 element Sterba
ground array of individual dipoles at 20 feet (6 m) elevation Receiver: five horizontal dipoles in diamond array |
| Accuracy | Poor |
| Weight |
8800 lb 4000 kg |
| 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
References
The Pacific War Online Encyclopedia © 2010, 2013 by Kent G. Budge. Index
