File:Spark gap transmitter diagram.png
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 18:13, 2 March 2010 | 967 × 955 (51 KB) | Chetvorno | {{Information |Description={{en|Diagram of a Wikipedia:spark-gap transmitter, an early radio transmitter used to send Morse code signals during the "Wikipedia:wireless telegraphy" era between 1900 and 1920. This example, from a 1917 boy's handcr |
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