NEIV YORK-CHICAGO CABLE 

 Line Impedance 



81 



In order that networks may be used to balance the lines for repeater 

 operation, it is necessary as a practical proposition that the impe- 

 dance characteristics of the lines be fairly uniform over the range of 

 telephone frequencies. The solid line in Fig. 26 shows the resist- 

 ance component of the impedance of a No. 19 loaded cable circuit 

 with all loading coils in place. The solid line in Fig. 27 shcnss the 



Fig. 25 — Assembly of Four-Wire Repeater Apparatus 



Coil xirL'cto IK I3t1> (tcrioa 



Fig. 26 — Line Characteristics — A Cable Circuit in Normal Condition 



