Airborne Communications Systems: A description of the development of aeronautical radio communications and the different systems in use

COMMUNICATION between aircraft and the ground, and between two or more aircraft, has always been the fundamental requirement of avionics. Once heavier‐than‐air machines had ceased to be a novelty, the development of reliable communication systems became essential, although it required the impetus of the 1914–18 War to produce a definite requirement.