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Program: Raduga

Means rainbow

Soviet telecommunication program. The payloads are Statsionar (C-band), Gals (X-band, 7.25-7.75 GHz) and maybe Volna (L-band).

The old Raduga are code named Gran' while the new ones (1-xx) are named Globus.

Raduga 01 satellite was the first to feature voltage stabilisation that helped to boost the characteristics of the onboard power subsystem by 20%. Raduga was also designed for three-axis stabilisation with autonomous orientation of its solar panels that ensured constant rotation of the wings at a speed equal to the orbital one. ISS-Reshetnev company was the first to introduce such a Sun tracking function, later it would become widespread globally.

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