Mark 27
Description of the radar set, tactical-technical characteristics
Figure 1: Antenna 66AGK of Mk. 27
| Specifications | |
|---|---|
| frequency: | 3 071 … 3 100 MHz
(S band) |
| pulse repetition time (PRT): | |
| pulse repetition frequency (PRF): | 1 500 Hz |
| pulsewidth (τ): | 0,3 µs |
| receiving time: | |
| dead time: | |
| peak power: | 50 kW |
| average power: | 225 W |
| instrumented range: | 40 NM (≙ 74 km) |
| range resolution: | |
| accuracy: | 146 m |
| beamwidth: | 6° |
| hits per scan: | |
| antenna rotation: | |
| MTBCF: | |
| MTTR: | |
Mark 27
Radar Equipment Mark 27, Mod 0 is operating in the S band search and ranging equipment designed for use with fire conrol eqipment on surface warships for the control of fire against surface targets. This radar replaced optical rangefinders on the top of battleship control towers.
The antenna used a parabolic reflector with dimensions of 2'6" × 1'3" (≙ 76 × 38 cm) with two waveguide horns. The reflector is constructed of horizontal, aluminum alloy slats, and the waveguide horn assembly is made from a man ganeze-bronze casting. The antenna employs lobe switching in azimuth at a rate of 1 720 cycles per minute. An A-scope with a diameter of 5 inch and a PPI-scope was used to display the echo signals.
The Radar Equipment Mark 27, Mod 1 has a larger antenna than the Mark 27, Mod 0, resulting in a narrower half-power beam width of 4 degrees.
Source:
- Catalogue of Naval Electronic Equipment - Supplement 1 - Jan 1948, p. 749