The Raduga-1 geosynchronous communications satellite was to have been the basis for the YeSSS-2 second generation Unified Satellite Communication System. Phase 1 of the system was to have consisted of three Raduga-1 spacecraft. The Raduga-1 was capable of communication not just with fixed earth stations, but mobile platforms as wel. It was equipped with the Tor C-band transponder, working at 20, 42, and 44 GHz. Communications satellite - geosynchronous. Maintenance of telephone and telegraph radio communications. Although a later generation system, Raduga-1 still used the KAUR-3 spacecraft bus. This was 3-axis stabilised using liquid propellant micro-engines to within 0.25 degrees of the earth's centre. The single-unit body was equipped with solar panels, and active liquid-gas phase-change thermoregulation system, and a corrective engine unit for making orbital adjustments. 25 square metres of solar panels provided 1280 W of power.

Total Mass: 2,000 kg.

Stationed at 49 deg E; first launch of alternate Raduga design. Maintenance of telephone and telegraph radio communications.

Stationed at 49 deg E; second launch of alternate Raduga design. Further expansion of the long-range telephone and telegraph radio-communications system in the territory of the USSR.

Stationed at 48 deg E; third launch of alternate Raduga design. Extension of the telephone and telegraph radio communications system on the territory of the Russian Federation.

Geosynchronous communications satellite, stationed at 35 deg E.

Raduga-1 military communications satellite initially named Cosmos 2372 by the RVSN press service. Stationed at 50 deg E.

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