The Pacific War Online Encyclopedia
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Yomiuri Shimbun. Fair use may apply.
| Wavelength | 150 cm |
| Pulse Width | 10 microsecond |
| Pulse Repetition Frequency
|
1000 Hz |
| Power | 5 kW |
| Range | 60 nautical miles (100 km) aircraft group 40 nautical miles (70 km) single aircraft 12 nautical miles (20 km) battleship |
| Antenna |
Mattress: two horizontal sets of
four dipoles (transmitter) and two horizontal sets of three dipoles
(receiver) |
| Scope |
A scope |
| Accuracy | ~1 mile 1-2 km |
| Resolution | 2200 yards/20 degrees 2000 meters/20 degrees |
| Weight |
1850 lb 840 kg |
| Production: | Sources disagree on the number of installations, but it appears that Type 21 was first fitted to Ise in 1942-4, Shokaku in 1942-8, Taiyo, Chuyo and Unyo in 1943-1, and others prior to 1943-8, with at least 30-40 sets deployed operationally. |
The Japanese Type 21 radar (also
known as Mark 2 Model 1 Type 2) was installed on surface ships beginning
in August 1943 and was nicknamed the Ship Mattress. Though nominally an
air search radar, it was used for surface search also. Some
officers at the Bureau of Naval Construction went so far as to
recommend that production of all other types be canceled. A land-based
version also existed, known as the
Type 1 Model 2,
which was known to the Japanese as the Mobile Mattress. Examples of the
latter were
captured at Roi-Namur and Kwajalein.
The first prototype was installed on Ise
just prior to the battle of Midway.
The radar was subsequently installed on carriers, battleships, and cruisers. As with other Japanese
radars, reliability was shaky, with failure of one of its 54 vacuum
tubes all too frequent. Taiho went to the Battle of the
Philippine Sea with one of
its two Type 21 radar sets barely operational.
References
CombinedFleet.com
(accessed 2007-10-29)
Friedman
(1981)
Guerlac
(1987)
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