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BELL SYSTEM TECHNICALyOURNAL 



the tuned transformer to match impedances and improve the efficiency 

 of transmission. Fig. 9 shows the transmission characteristic and 

 circuit schematic of the same tuned transformer when operating 

 between two non-inductive resistances. Repeating coils were used 



48 49 50 51 52 



FREQUENCY — KILOCYCLES 



Fig. 9 — Transmission loss characteristic of a triple transformer type of 

 tuned circuit. 



between the transformer and the terminated resistances to match 

 impedances. Although the width of the transmission band at 50 



