590 



BELL SYSTEM TECHNICAL JOURNAL 



o 



Q. 



UJ 



I- 

 (/1 



C 



H 



Q 

 UJ 



cc 

 cr 



UJ 

 U- 

 UJ 



cr 



I 



UJ 



cr 

 O 



> 



<r 



D 

 U 



JD 

 "U 



I 



z 

 < 



CYCLES PER SECOND 

 Fig. 18 — Gain-frequency characteristic of regulating repeater without line equalizer. 



4.0 



3.5 



(0 

 O 

 z 

 o 

 o 

 iij 



UJ 



3.0 



2.5 



2.0 



1.5 



1.0 



DELAY 



INTRODUCEDI 



BY LINE 



DELAY 



INTRODUCED 



BY LINE AND 



EQUALIZER 



10 



30 50 100 200 500 1000 2000 



CYCLES PER SECOND 



5000 8000 



Fig. 19 — Delay-frequency characteristic of 50 miles 16-ga. B-22 cable with and without 



delay equalizer. 



