Tase-1 Early Warning Radar


260-286 cm
Pulse width
20-60 microseconds
Pulse repetition frequency     
375 Hz
Peak power
50 kW
Range 110 nautical miles (200 km) aircraft formation
Transmitter: nondirectional box of four vertical sets of dipoles
Receiver: two pairs of dipoles with reflectors
A scope
8800 lb
4000 kg
Production About 30 sets from 1943-2

The Tase-1, also known as Mark 235 or "Ultrashortwave Warning Device B", was built by the Japanese Army for use on its own fleet of transport ships and submarines. Its existence illustrates the duplication of effort engendered by the severe interservice rivalry in Japan. The radar was unsuccessful, in part because of a mistaken belief by the Army that Allied aircraft could home on its transmissions, and the Army reluctantly adopted the Navy Type 22.


Grunden (2005)

Nakagawa (1997)

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