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This paper presents a design procedure for the practical design of RC wide-band 90-degree phase-difference networks. The important part of the paper is the design procedure given in "cookbook" fashion with a numerical example to clarify it. This procedure consists of many steps, each step being a relatively simple one. This should make it a useful design tool for people without much background in network theory. A brief theoretical introduction is presented but this is far too sketchy to be of much use in understanding just what is behind the design procedure. Some practical hints on construction and alignment are given.