History and Radio Age Avionics : Aviatio n Electronics Combining two large engineering fields that reached maturity during 20 th century. Major development in aviation dated back in 18 th century with experiments in lighter-than- air craft. Much of the fundamental electromagnetic / electricity theories were developed and experiments were conducted during 18 th and 19 th centuries.
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In USA, the first commercial broadcastingcommenced in Aug. 20, 1920.
Although no audience at that time.
The electronics of the period were large andheavy and the cost for every gram of mass inan aircraft is high.
The environment was harsh;- widetemperature variation (-40o C to 45o C),enormous vibration due to propeller engineand shock and low frequency shake whilelanding on rough surfaces (concrete and
Because the first equipment was fornavigation and one-way radio reception, onlyreceivers, with no transmitter, were needed. It was common for an aircraft to blink a landing
light or wiggle its wings in response to atransmission from controller on the ground.
The ground environment wasn’t much better.
The first navigation aids for night flying werebonfires maintained by farmers paid toperform the task.