Type 291 Air Search Radar


Wavelength 140 cm
Pulse Width     
1.1 microsecond
Pulse repetition frequency     
500 Hz
100 kW
Range 35 nautical miles (65 km) on aircraft at 10,000 feet (3000 meters)
30 nautical miles (55 km) on aircraft at 5000 feet (1500 meters)
15 nautical miles (30 km) on aircraft at 1000 feet (300 meters)
9 nautical miles (17 km) on battleship
6 nautical miles (11 km) on destroyer
3 nautical miles (5 km) on submarine
Transmitter: Single dipole cross
Receiver: Two dipole crosses
200 yards/3 degrees
180 meters/3 degrees
160 yards
150 meters

The British Type 291 was a refinement of the Type 286P using the same antenna. It was fitted to nearly all British destroyers, escorts, and submarines. It was a simple design, requiring just a week to install. Later versions had PPI displays. An earlier trial version, Type 290, was installed on a few ships.


Buderi (1998)

Friedman (1981)

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