Morse Key - AWA, Radio, 1915-1920 Object Reg. No: ST 21420

Transmitting key used to input morse characters to a radio transmitter, manufactured by AWA. From its robust design, it was probably used with a spark transmitter.

The key interupts the supply to the transformer primary. When the key is pressed, the A.C. ciircuit is closed; a high voltage is induced until the spark gap resistance breaks down. Oscillations are then created in the closed oscillatory circuit and induced in the aerial circuit from whence they are radiated into space. As soon as the key is released, the primary circuit is broken and transmission ceases.
Polished wooden base with two brass terminals, pivoted brass arm with insulating knob. On the knob end is a normally open contact and on the other end a normally closed contact and a return spring. Underneath two thick copper wires connect the pivot and the bottom normally open contact to the terminals.
Acquisition Information:
Donation from Amalgamated Wireless (Australasia) Ltd., 1940
Discipline: Technology
Dimensions: 80 mm (Height), 125 mm (Width), 225 mm (Length)

More information

Tagged with: telegraphy, morse keys, telegraph equipment, radios
Themes this item is part of: Information & Communication Collection, Radio from sparks to valves, 1914 - 1920
Primary Classification: COMMUNICATIONS
Secondary Classification: Radio
Tertiary Classification: transmitters
Inscriptions: Brass plaque: AMALGAMATED WIRELESS / (brackets)A-SIA / Ltd / No. 97-3164 SYDNEY. N. S. W.
Manufacturer: Amalgamated Wireless (Australasia) Ltd., Sydney, New South Wales, Australia, 1915-1920

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