. The Bell System technical journal . Co ?■ HHWW -wv -W-^W-AV f Co <^vvvHh Fig. 15—Four-terminal equivalent network for divided plate crystal. There are four possible connections for a crystal with two sets ofplates used in a balanced filter. These connections and their equivalentcircuits for transmission through as used in the filter are shown inFig. 16. In order to prove these equivalences let us consider theequivalence shown on Fig. 16A. The four-terminal network repre-sentation for this case is shown in Fig. 17, which is obtained from 240 BELL SYSTEM TECHNICAL JOURNAL Fig. 15E. Th

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. The Bell System technical journal . Co ?■ HHWW -wv -W-^W-AV f Co <^vvvHh Fig. 15—Four-terminal equivalent network for divided plate crystal. There are four possible connections for a crystal with two sets ofplates used in a balanced filter. These connections and their equivalentcircuits for transmission through as used in the filter are shown inFig. 16. In order to prove these equivalences let us consider theequivalence shown on Fig. 16A. The four-terminal network repre-sentation for this case is shown in Fig. 17, which is obtained from 240 BELL SYSTEM TECHNICAL JOURNAL Fig. 15E. The capacitances dz and C24 will be equal due to thesymmetry in the crystal, while C14 will equal C23 for the same capacitances are directly connected to the outside terminals ^— ^ / 4 * / (A) ^.-^ y / * / (B) —2 P (C)

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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1