Range of modernization comprises the following:

• Modernization of the 1S91M2 surveillance and tracking station
• Modernization of the 2P25M2 self-propelled launcher

Range of 1S91M2 modernization:

1. Installation of the Target Identification System SIC 11 operating in the MARK XII standard. The SIC 11 System is equipped with the AN/TPX-56 Interrogator, which operates in the modes: MOD1, MOD2, MOD3/A, MOD C and MOD 4. The System clearly classifies the plane as "friend" or "foe", at the same time providing the operator with the target distance and azimuth data.
2. Installation of the long-range thermal camera.
3. Replacement of the KT53-2 television camera and the WPU-44 indicator with a modern CCD camera with a zoom lens and LCD display.
4. Replacement of TWT tubes in receiving systems with semiconductor amplifiers with low signal-to-noise ratio.
5. Replacement of the Moving Target Indicator systems constructed on the basis of storage tubes with digital semiconductor system of large scale of integration.
6. Replacement of energy-consuming tube power supply units voltage up to 300V with modern semiconductor power suppliers furnished with protection system against short-circuit.
7. Installation of a dehumidifying system in order to store the equipment for a long time and to limit failure frequency due to various atmospheric conditions.

In 1999 WZU Nr 2 was granted the DEFENDER Award at the International Salon of Defense Industry for the modernization of the 1S91M2-P1 Surveillance and Tracking Station of the 2K12 KVADRAT (SA-6) Anti-Aircraft Missile System

Range of the 2P25M2 launcher modernization:

1. Replacement of the 1A18M1 electromechanical and mechanical scaler with a digital computer-controlled scaler.
2. Replacement of electromechanical and mechanical interface units with the scaler in azimuth, angle and distance with a semiconductor system of large scale of integration.
3. Replacement of the synchronous communication system with a semiconductor system of large scale of integration.
4. Replacement of the 19SBM1 autonomous control unit with simplified control function unit.
5. Replacement of tube gain/amplifiers of azimuth and elevation amplidynes with semiconductor amplifiers.
6. Replacement of the 12SM power supplier with a modern semiconductor power supplier furnished with protection system against short-circuit.
7. Replacement of the TWT traveling wave tube with a semiconductor low-noise amplifier.