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Tachi-4 Fire Control Radar


Photograph of Tachi-4 fire control radar antenna
National Archives. Via Nakagawa (1997)


Specifications:


Wavelength     
150 cm
Pulse width
2 microseconds
Pulse repetition frequency      
1000 Hz
Power
10 kW
Range 12 miles (20 km) aircraft
Antenna
Transmitter: single 4-element Yagi
Receiver: Four 3-element Yagis in diamond array connected through a capacitive phase ring
Weight
5500 lb
2500 kg
Production About 25 sets from 1943-11


The Tachi-4 was a land-based gunlaying radar intended to replace the Tachi-1 and Tachi-2. It was known in prototype as the Mark Ta Model 4 (Chijo-yo Dempa Hyotei-ki, 4-gata) and was based in part on a captured British gunlaying radar from Singapore. The original dipole elements were replaced with Yagi arrays, the center array acting as the transmitter and the four other arrays being partially electronically steered.

References

Grunden (2005)

Nakagawa (1997)


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