As a new feature on the Boeing 702, angled solar reflector panels along both sides of the wings form a shallow trough and concentrate the sun rays on the solar cells. Dual and triple junction gallium arsenide solar cells enable such high power levels. The cells were developed by Spectrolab. The Boeing 702 separates the bus and payload thermal environments and substantially enlarged the heat radiators to achieve a cooler, more stable thermal environment for both bus and payload. This increases unit reliability over service life.
Deployable radiators use flexible heat pipes, which increase packageable radiator area.
Further thermal control occurs through passive primary rejection via heat pipes. These include the Atlas III family, Delta III, Ariane 4 and 5, Proton, and Sea Launch. This diagram shows the structure of the Boeing 702. A Boeing 702 satellite being prepared. This was to be used for digital radio broadcasting.