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Type 293 Fire Control Radar


Specifications:


Wavelength 10 cm
Pulse Width     
0.7, 1.5, or 1.9 microsecond
Pulse repetition frequency     
500 Hz
Scan rate
18 rpm
Power
500 kW
Range 15 nautical miles (30 km) on aircraft at 10,000 feet (3000 meters)
12 nautical miles (20 km) on aircraft at 5000 feet (1500 meters)
10 nautical miles (18 km) on aircraft at 1000 feet (300 meters)
17 nautical miles (31 km) on battleship
12 nautical miles (22 km) on destroyer
4 nautical miles (7 km) on submarine
Accuracy
50 yards/0.5 degrees
45 meters/0.5 degrees
Antenna
Tilted single cheese
Scope
A scope
Production
From 1945

The Type 293 was a British naval fire control radar based on the Type 276. used for target designation and optimized for accuracy. It was autorotating and was equipped with a PPI display. The antenna was somewhat larger, producing a narrower beam, and was tilted 15 degrees from the horizontal to reduce sea return. Type 293M, which went into service as the war was winding down, had an even larger antenna (8' or 2.4 meters) for an even narrower and more sensitive beam, and had enough range to function as a search radar.

The Type 293 was usually equipped with the Mark 2 Target Indication Unit, which projected three bearing lines on the PPI. These could be manually adjusted to move onto a return on the PPI, and the corresponding bearing was transmitted to the appropriate weapon. The unit also had a ranging element that could transmit two separate ranges. Visual bearings could be entered into the TIU-2 manually.


References

Buderi (1998)

Friedman (1981, 2006)


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