. The Bell System technical journal . ^T^j^r^^w^ ^JMLr^^Jm/ -^W^- BALANCEDI INDUCTANCE. /WV) vQikl^ CRYSTAL ELEMENT MECHANICALLY ONE ELECTRICALLY TWO Fig. 2—The schematic circuits of each of the twelve filters are the same exceptfor the addition of the condenser shown by the dotted lines which appears only inthe two lowest frequency filters. CRYSTAL CHANNEL FILTERS 127 an impedance transformation internal to the filters and therebypermit the use of crystals of practical thicknesses for these , the equivalent circuit for each of the twelve filters is thesame. In the system the fi
. The Bell System technical journal . ^T^j^r^^w^ ^JMLr^^Jm/ -^W^- BALANCEDI INDUCTANCE. /WV) vQikl^ CRYSTAL ELEMENT MECHANICALLY ONE ELECTRICALLY TWO Fig. 2—The schematic circuits of each of the twelve filters are the same exceptfor the addition of the condenser shown by the dotted lines which appears only inthe two lowest frequency filters. CRYSTAL CHANNEL FILTERS 127 an impedance transformation internal to the filters and therebypermit the use of crystals of practical thicknesses for these , the equivalent circuit for each of the twelve filters is thesame. In the system the filters work in parallel at one end andbetween terminating impedances of 600 ohms. The two condensersappearing in the series arms at the left end of the filter schematic areused in obtaining satisfactory operation of the filters in parallel andotherwise might be omitted provided the inductance at this end wasmade smaller at the same time. Figure 2 indicates the separate physical elements and the mannerin which these are connected in the filters. In considering the per-formance of th
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
