Description of the radar set, tactical-technical characteristics
Figure 1: Type 278
|pulse repetition time (PRT):|
|pulse repetition frequency (PRF):||400 or 500 Hz|
|pulsewidth (τ):||0.5 or 2 µs|
|peak power:||600 kW|
|instrumented range:||90 km|
|beamwidth:||β= 4.5° ;ε= 2.5°|
|hits per scan:|
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.