SPACE-SI has developed a very efficient and capable data downlink solution for cubesat and microsatellite platforms: • High-speed data downlink capability • Low electrical power requirement • High PA power-added efficiency (PAE) • GaN technology • LVDS data input • Galvanical isolation to the VBUS (microsatellite only) • Broad input voltage range from the BUS • Telemetry data (thermal, current and RF power) • Low RF carrier phase noise • Low harmonic and spurious spectral content • No external RF filtering required • Lightweight and compact size.