www.radartutorial.eu www.radartutorial.eu Card Index of Radar Sets - Ancient Radars

Mk. 8

Description of the radar set, tactical-technical characteristics

Figure 1: Mk. 8

Figure 1: Mk. 8

Specifications
frequency: 3 050 ± 50 MHz
(S band)
pulse repetition time (PRT):
pulse repetition frequency (PRF): 800 Hz
pulsewidth (τ): 0.6 µs
receiving time:
dead time:
peak power: 15 … 20 kW,
later 20 … 30 kW
average power: 14, later 24 W
instrumented range: 30 NM (≙ 55 km)
range resolution: 110 m
accuracy:
beamwidth:
hits per scan:
antenna rotation:
MTBCF:
MTTR:

Mk. 8

Mk. 13 is operating in the S band radar mounted on Gun Directors Mk. 34 and 38 and using an azimuth scanning array for naval fire control systems.

The antenna is a 14 × 3 polyrod array with the dimension of 124 × 34 inches (≙ 3,25 × 0,87 m). It uses a vertical polarization and provides a beamwidth of 6 degrees in elevation. Motordriven, continuously variable waveguide phaseshifters provides scanning through ± 15 degrees in azimuth.

Of these radars, 107 were produced and were used primarily in the Pacific theater of war. Due to the complicated control of the antenna, this steering concept was abandoned and with the successor Mk. 13 a mechanical steering was used again.