In conjunction with the RL altimeter (PRV-16,PRV-9), it operates as a 3D radar with the designation P-40 "ARMOR" (in NATO code "Long Track", introduced into the armament in 1963)
The 2K11 "KRUG" kit operates as a 1S12 target acquisition station (introduced into the armament in 1965). More about the 2K11 "KRUG" kit and its individual parts in the following article.
Citace :
The 1S12 surveillance radar is used to detect enemy air targets and to transmit their coordinates to the 1S32 radar. The vehicle is built on a U-426 chassis (a modified AT-T heavy artillery tractor). The vehicle is equipped with a filtration device to protect the crew from the effects of weapons of mass destruction. In the driver's cabin there are control panels of two power plants, two R 123 radios with SPU 7 tank-call equipment and navigation equipment. Behind the driver's cab is a box superstructure consisting of three sections. The first is the combat compartment, where four workstations with three radar screens are located. It also houses the switching panel, the electronic interference protection device, the data storage system, the AT III M navigation system and the RL 225 identification device. During the movement of the asset, the navigation device recorded the distance left to travel, thus enabling the position of the asset and the radar antenna to be immediately indicated when the combat position was taken. The second section is the transmitter area. The third section of the superstructure houses two gas turbines and connections for external power. Since the gas turbines had a considerable consumption (about 80 liters per hour), the 1S12 could be powered by an electric generator located on a two-axle trailer.
The total capacity of the three fuel tanks (2x 400 l, 1x 250 l) was 1,050 litres of diesel. It took about ten minutes to deploy the vehicle. The lifting of the antenna was practically done manually, in the case of the parabolic antenna it was then provided by an electric motor. The number of rotations of the antenna could be set to 12 or 16 per minute. The 1S12 radar could intercept enemy aircraft at a distance of 180 km at an altitude of 12,000 m or at a distance of 70 km at a flight altitude of 500 m. The impulse power was 1.7 to 1.8 MW. The crew of the 1S12 radar consisted of five men: the squad leader, the radar chief, the driver and three operators. The driver was responsible for, among other things, powering the systems during his tour of duty. The third operator usually operated the radio and telephone switchboard
The radar was upgraded in 1966-1968.
1S12 modification:
- 1S12A
- 1S12A1
- 1S12M1
P-40 modifications (1RL128D):
- 1RL111D
- P-40A-1 (1RL128D-1)
- P-40M1 (1RL128DM1)
Tactical specifications:
Frequency: : ~2.6 GHz
Pulse power: 1,6-1,8 MW
Repeat frequency: 400/800 Hz
Antenna speed: 12/16 rpm
Max. target detection distance: 350 km
Target detection range at altitude
- 500 m: 70 km (85 km after upgrade)
- 6000 m: 150 km (220 km after upgrade)
- 12000 m: 180 km (230 km after upgrade)
Distinctive capability:
- at a distance of 1500 m
- in azimuth 1,5°
Combat readiness time: up to 10 min (including antenna deployment)
Antenna deployment: manual or electromotive
Electrical power supply: 3x220 V/400 Hz
Power input: 52 kW
EC: 2 x gas turbine, 8 hours of operation, or outboard power pack
Operator: 5
Dimensions:
- Length: 9700 mm
- Width: 3200 mm
- height: 4100 mm
Weight: 36700 kg
Max. speed: 40 km/h
Chassis: U-426 (a modification of the heavy artillery tractor AT-T with seven running wheels)
Fuel capacity: 1050 l (2x400 l, 1x250 l)
Driving range: 200 km