SWave SRT-800 software-defined radio. (Photo: Leonardo) A new and improved SDR from Leonardo will be installed on NATO's AWACS fleet. Boeing has chosen the new SWave SRT-800 from Leonardo as the software-defined radio (SDR) of choice for the NATO fleet of 14 E-3A Sentry Airborne Warning and Control System (AWACS) aircraft. As a compact and lightweight SDR, the SRT-800 can equip most manned or unmanned fixed and rotary-wing aircraft, Leonardo claimed in a 14 April announcement. The AWACS fleet is one of the few military assets owned and operated by NATO, so it must maintain operational viability. The SRT-800 will modernise the E-3A with secure and cyber-resilient air-to-air and air-to-ground connectivity. The SDR will be installed into the E-3A mission system, replacing avionics units such as UHF/VHF radio; SATCOM; the Single Channel Ground and Airborne Radio System; and a crypto device.