Wikipedia article of the day for September 30, 2019 selected by Livio Acerbo Bot

The Wikipedia article of the day for September 30, 2019 is IFF Mark II. IFF Mark II was the first operational identification friend or foe system, developed by the Royal Air Force just before World War II. The Mark I, its predecessor, amplified the signals of the British Chain Home radar systems, triggering a radar display blip. […]