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Mk. 4

Description of the radar set, tactical-technical characteristics

Figure 1: Mk. 4

Figure 1: Mk. 4

Specifications
frequency: 700 MHz
(UHF-Band)
pulse repetition time (PRT):
pulse repetition frequency (PRF): 1 639 Hz
pulsewidth (τ): 1.5 µs
receive time:
dead time:
peak power: 20 kW
average power: 46 W
instrumented range: 17 NM (≙ 32 km)
range resolution: 360 m
accuracy:
beamwidth: 12°
hits per scan:
antenna rotation:
MTBCF:
MTTR:

Mk. 4

Mk. 4 was operating in UHF-Band fire control radar. It was used with the gun directors Mk. 33 and Mk. 37 with 5-inch guns.

The antenna consisted of two cylindrical parabolic reflectors, lying one above the other with a row of 4 half-wave dipoles each. The altitude could be determined from the phase difference between the two antenna groups. However, this was only possible from an elevation angle higher than 10° because of the disturbing multipath receiving at lower elevation angles.