Four Types of Aerial Coupling.— Top left, a simple tapped coil; top right, a tapped coil tuned with a variable condenser; bottom left, an serial coupler employing a separate primary; lower right, a regeneraformer.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19310925.2.45.1
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Radio Record, Volume V, Issue 11, 25 September 1931, Page 16
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34Four Types of Aerial Coupling.— Top left, a simple tapped coil; top right, a tapped coil tuned with a variable condenser; bottom left, an serial coupler employing a separate primary; lower right, a regeneraformer. Radio Record, Volume V, Issue 11, 25 September 1931, Page 16
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