Wideband phase shift networks for single sideband transmitters
Laden, Hyman Nathaniel
Frey, Austin R.
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During the spring of1948, single sideband communication procedures began to be widely discussed in amateur radio circles. This was due to a radical simplification of existing single sideband techniques by a group of General Electric Company engineers, which work was extensively publicized. The foundation of these techniques was the application of cascades of the well known, Muller R-C phase shift networks and other more complex lattices derived from this prototype. The theoretical discussion of networks appeared in December 1946 as the work of R. Dome of General Electric Company. In the Spring of 1948, this work was first brought to the attention of the author, then a student at the United States Naval Postgraduate School, Annapolis, Maryland. It was immediately obvious that existing design procedures did not result in optimum performance. The design procedure discussed here was first derived by the author in July of 1948 as a result of independent research stimulated by Dome's work, discussed in some detail below. In February 1949, he became aware for the first time of the work of D.G.C. Luck: "Properties of Some Wide-Band Phase-Splitting Networks", Proceedings of the Institute of Radio Engineers, volume 37, number 2, February 1949, pages 147-151. In this latter work is derived the results embodied in Figure 21 of the following paper. The method of derivation here differs considerably from that of Luck and, because of the more detailed attention to underlying hypothesis, seems somewhat more general. Also, the method used here permits direct extension to multiple cascades of phase shift networks.
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