TYPE-O CARRIER SYSTEM 



713 



fiers. The filter construction is shown on Fig. 32. This filter employs 

 ferrite coils and condensers, having no crystals because of percentage 

 band width considerations. These filters employ a form of printed wiring 

 for 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 of 

 N. Tliis method permits the inclusion of a slide arrangement which 

 guides the units into place, and insures proper registration of the plugs 

 and jacks. Some units are above the framework; others are suspended 

 from it. The same die-casting, inverted, serves both upper and lower 



135 n- 



in 40 

 O 



20 



40 50 



FREQUENCY 



60 70 80 90 



KILOCYCLES PER SECOND 



100 200 400 



Fig. 23^T\pical directional filter characteristics (Cb , 538A). 



