Active satellite meaning

An operational satellite that uses on-board powered equipment (for example, a transponder or payload) to receive uplink radio‑communication signals from an Earth (base) station and to transmit or retransmit them on the downlink to other Earth stations or user terminals. In UK and Irish legal practice the expression is descriptive rather than a defined statutory term, but it is widely used in satellite communications, spectrum licensing and space operations, aligning with ITU Radio Regulations concepts of space stations and transponders. Key legal features are the use of assigned radio frequency spectrum and Earth station links, which require regulatory authorisations and coordination (for example, Ofcom or ComReg licensing and ITU filings by the notifying administration). The term is typically encountered in capacity and transponder lease agreements, service contracts, procurement, insurance and liability allocation, and in UK space licensing under the Outer Space Act 1986 and Space Industry Act 2018. It is commonly contrasted with a passive satellite, which merely reflects signals and has no on‑board amplification or processing. Usage and legal effect are broadly consistent across England & Wales, Scotland, Northern Ireland and Ireland, subject to regulator‑ and licence‑specific requirements.