High Frequency Apparatus Page 86

88 86 HIGH FREQUENCY APPARATUS Fig. 1.-Core of transformer with dimensions lapping alternately first to the right and then to the left for a distance of 2 in. as shown in Fig. 2. When each bundle has been built up to a thickness of 2 in., friction tape should be wrapped around the center or winding space to compress the sheets into a compact bundle. If the sheets are clamped in a vise and the tape wrapped around the projecting end, the core may be tightly bound as the bundle is released an inch at a time. After the two bundles have been formed, they may be joined by interleaving the 2 x 73/4 in. pieces to form a yoke between the short legs. The fourth side of the hollow rectangle is not to be built up until after the windings have been placed in position. Core irons 230 DCS. 2"x4. 230 DCS. 2"×7 Build up 2 of these Fig. 2. Short leg of core upon which winding is placed