. QST . The elements of this dual20 - 40-nieter beam are only24 feet over all, and the boomis 16 feet long. The elementsare fanned for broadbanding. moviiifi (jne of the hinge bolts or the other. Similar U bolts at each end of the boom supporta mounting for the antenna elements. Thesemountings are of redwood, l^g inches thick, 3%inches wide and 7 feet long. Each half element is made up of two 12-footlengths of ST-61 aluminum tubing, jo inch indiameter with Jig-inch walls. At each of theinner ends, the tubing is flattened and drilledfor the threaded rod of a feed-through the outer
. QST . The elements of this dual20 - 40-nieter beam are only24 feet over all, and the boomis 16 feet long. The elementsare fanned for broadbanding. moviiifi (jne of the hinge bolts or the other. Similar U bolts at each end of the boom supporta mounting for the antenna elements. Thesemountings are of redwood, l^g inches thick, 3%inches wide and 7 feet long. Each half element is made up of two 12-footlengths of ST-61 aluminum tubing, jo inch indiameter with Jig-inch walls. At each of theinner ends, the tubing is flattened and drilledfor the threaded rod of a feed-through the outer ends of the supports, the elementsare attached to similar feed-through insulatorsby means of clamps fashioned from sheet threaded rod of the outer feed-throughinsulator is made to about 6 inches abovethe top of the insulator. This extension servesas a vertical truss in bracing the elements. Alsoattached to this insulator with a sheet-metalstrap is a 30-inch length of ^-inch aluminumtubi
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectradio, bookyear1915
