. The Bell System technical journal . r. \ J \ LOW-PASS\ BRANCH \ > V HIGH-PASS\ BRANCH r )11 I ^^■^ \ J 1 ^..^ \ 1 i 1 0 10 20 30 40 50 60 70 80 90 1( FREQUENCY IN KILOCYCLES PER SECOND Fig. 22—Tj-pical line filter characteristics (Gl, 537A or 538A). TYPE-O CARRIER SYSTEM 713 fiers. The filter construction is shown on Fig. 32. This filter employsferrite coils and condensers, having no crystals because of percentageband width considerations. These filters employ a form of printed wiringfor interconnection of c()mj)onents. The terminal framework is shown on Fig. 33. This framework em-ploys a
. The Bell System technical journal . r. \ J \ LOW-PASS\ BRANCH \ > V HIGH-PASS\ BRANCH r )11 I ^^■^ \ J 1 ^..^ \ 1 i 1 0 10 20 30 40 50 60 70 80 90 1( FREQUENCY IN KILOCYCLES PER SECOND Fig. 22—Tj-pical line filter characteristics (Gl, 537A or 538A). TYPE-O CARRIER SYSTEM 713 fiers. The filter construction is shown on Fig. 32. This filter employsferrite coils and condensers, having no crystals because of percentageband width considerations. These filters employ a form of printed wiringfor interconnection of c()mj)onents. The terminal framework is shown on Fig. 33. This framework em-ploys aluminum die-castings in contrast to the frabricated framework ofN. Tliis method permits the inclusion of a slide arrangement whichguides the units into place, and insures proper registration of the plugsand jacks. Some units are above the framework; others are suspendedfrom it. The same die-casting, inverted, serves both upper and lower 135 n-. in 40O 20 / ^ v / \ / \ n / \ / \ \ / \ \ / \ \ \ // \ / / N k \i \ / , \ 1 \ i V \ \ N 11 Ji \^ J V \ 1 / 1 L ^-N 1 / 111 \y 1 1 \ 1 \ ^ / 1 _/ 1 1 _LJ. 40 50 FREQUENCY 60 70 80 90 KILOCYCLES PER SECOND 100 200 400 Fig. 23^T\pical directional filter characteristics (Cb , 538A). 714 THE BELL SYSTEM TECHNICAL JOURNAL, JULY 1952
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