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Type 278

Description of the radar set, tactical-technical characteristics

Figure 1: Type 278

Figure 1: Type 278

Specifications
frequency: S-Band
pulse repetition time (PRT):
pulse repetition frequency (PRF): 400 or 500 Hz
pulsewidth (τ): 0.5 or 2 µs
receive time:
dead time:
peak power: 600 kW
average power:
instrumented range: 90 km
range resolution:
accuracy:
beamwidth: β= 4.5° ;ε= 2.5°
hits per scan:
antenna rotation:
MTBCF:
MTTR:

Type 278

Type 278 was operating in S-Band height finder for the Glamorgan Weapon System (G.A.W.S.) in UK County-class destroyers.

The antenna reflector is a truncated paraboloid with the dimensions of 6 feet width and 8 feet 6 inches height. It can be elevated and trained in either direction by manual control. A stabilization against roll and pitch is made by the servo system. The magnetron is driven by a hydrogen thyratron modulator, the pulse forming network being locally or remotely switched to one of two pulse lengths. The smaller pulse length caused better resolution but had disadvantages due to less maximum range.