Abstract: A power distribution line communication system for, and method of, reducing effects of signal cancellation at locations along the distribution line due to standing waves caused by reflections of a carrier signal impressed on the distribution line. A same outgoing data signal is modulated on each of a plurality of carrier signals having different frequencies. The carrier signal frequencies are selected such that all of the carrier signals will not experience signal cancellation at a same location on the distribution line. The modulated carrier signals are simultaneously impressed on the distribution line for transmission to remote locations, thereby ensuring reception of the outgoing data signal at each remote location.

Abstract: A method of making a product for use in fabricating a low-loss core of a transformer. The core is composed of a web of amorphous metal of small thickness. In forming the product, the web is wound into an annular spiral structure on a circularly cylindrical mandrel. The structure is removed from the mandrel and collapsed into an approximate figure "8" shape and groups of cuts are produced in the upper collapsed surface of the figure "8". Each cut defines a step of a group. Each step has a number of turns of the web and each group has a number of steps. The steps of each group are offset in a succession along the structure and penetrates progressively into the structure. Successive groups extend progressively inwardly throughout the structure. The cuts subdivide the structure into separate strips. The strips are wrapped in a spiral to form a lapped spiral structure onto a second circularly cylindrical mandrel of smaller diameter than the first mandrel.

Abstract: A method of making a transformer having a core composed of a web of magnetic amorphous metal of small thickness.The laminations of the core of the transformer are the stacked turns formed by winding the web into a spiral having a window in the center. The coils are wound as integral structures having openings for telescoping the coils onto the core. For the telescoping, the core is cut and converted into a U-shaped structure on whose arms the coils are telescoped. The cut joint is a butt-lap-step joint. To produce such a joint, the laminations are divided into groups and each group is divided into steps which are spaced longitudinally of the web. After the coils are telescoped onto the core, the cut ends of the arms of the U are abutted to form a closed core. The cuts in the laminations that make up alternate groups in the stack are inclined to the longitudinal center line of the web at a first angle different from 90.degree..