Mk. 4
Description of the radar set, tactical-technical characteristics
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 |
| receiving 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.