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Mark 27 Fire Control Radar


Photograph of Mark 27 radar antenna

Catalogue of Electronic Equipment


Specifications:

Wavelength       10 cm
Pulse width
0.3 microseconds
Pulse repetition frequency     
1500 Hz
Power 50 kW
Range 40,000 yards (36600 m) against battleships and cruisers
10,000 yards (9100 m) against submarines
Minimum range 200 yards (180 m)
Antenna
2'6" x 1'3" (76.2cm x 38.1cm) parabolic section
Scope
5" A scope
PPI
Accuracy 15 yards (14 m)
3 mils
Resolution 120 yards (110 m)
6 degrees
Antenna weight
425 lbs
193 kg
Production
Appeared late in the war

The Mark 27 was  a fire control radar that took the place of optical range finders atop battleship fire control towers. It was developed from the Mark 3 but was much more compact.

References

Burr (2011; accessed 2013-2-5)
Catalogue of Electronic Equipment (1952; accessed 2013-2-5)
Friedman (1985)
NavWeaps.org (2008-8-14; accessed 2013-2-5)


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