. The Bell System technical journal . Fig. 11—A three-winding transformer crystal filter. network with the branches Zi and Zi is placed in series with the trans-forming network and the series terminating inductances. Hence if thehybrid coil has nearly a unity coupling between its secondary coils and. Fig. 12—A narrow-band lattice crystal filter. the remainder of the transformer is designed to work into the impedanceof the filter, the network of Fig. 11 is equivalent to the narrow-bandlattice filter of Fig. 12 with crystals removed from the lattice arms, plus

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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1