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Naval History and Heritage Command #NH-80532
Cropped by author
| Wavelength | 10 cm |
| Pulse Width | 0.7 or 1.5 microsecond |
| Pulse Repetition Frequency
|
500 Hz |
| Scan Rate |
Manual; approximately 2 rpm |
| Power | 7 kW |
| Range | 11 nautical miles (20 km) battleship 10 nautical miles (19 km) heavy cruiser 8 nautical miles (15 km) destroyer 6 nautical miles (11 km) frigate 3.5 nautical miles (6.5 km) PT boat 3 nautical miles (6 km) submarine |
| Antennas |
Double cheese |
| Scope |
A scope. Plan Position Indicator on later
models |
| Production |
Hundreds of sets from 1941 on |
The Type 271 was an early British
naval sea search radar, available when war
broke out in Europe. It was equipped initially with an A-scope display.
Later versions had a PPI display. It was fitted primarily to escort
vessels (corvettes and frigates). It used a "double cheese" antenna enclosed in a Perspex (plexiglass)
"lantern". The antennas were steered using an automobile steering wheel
from an operator's station directly below the "lantern". This arrangement
minimized the length of the coaxial cables used in this very early
microwave set.
An improved version, Type 271Q, was introduced in 1943 and had a much
more powerful magnetron (100 kW) and correspondingly greater range. The
Type 272 was an unsuccessful attempt at a refined version for destroyers and cruisers, while Type 273 was a successful version for cruisers and battleships.
References
HMCS Sackville Web Site (accessed 2010-4-15)
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