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Maximum Output Networks for Telephone Substation and Repeater Circuits

1920; Institute of Electrical and Electronics Engineers; Volume: XXXIX; Issue: 1 Linguagem: Inglês

10.1109/t-aiee.1920.4764962

2330-9431

George A. Campbell, R. Foster,

Electromagnetic Compatibility and Noise Suppression

Ideal telephone substation and repeater circuits are shown to present output and input requirements which can be met by a type of circuit containing four resistances, each of which has maximum output; maximum output is found to involve biconjugacy, i.e., the four resista. nces fall into two pairs without active electrical connection between the two resistances of either pair; all circuits meeting these requirements with the minimum number of elements are enumerated; the necessary formulas for proportioning these circuits and also circuits having superflous elements are derived. The discussion of the properties of these four-resistance circuits, to which a consideration of three-resistance eire-uits is added, is a contribution to the important problem of the properties of the most general circuit containing ideal transformers.