LINE FILTER FOR PROGRAM SYSTEM 



387 



O 600 



I 500 



200 



123456789 



FREQUENCY IN KILOCYCLES PER SECOND 



Fig. 3 — Phase shift in fiher and in component parts. 



per second the delay gradually increases with frequency, rising quite 

 rapidly outside the program band. The high attenuation at fre- 

 quencies above the program range, however, eliminates any effect this 

 distortion otherwise might have on the program. 



513 



O 500 



Q 5 



2 3 4 5 6 



FREQUENCY IN KILOCYCLES PER SECOND 



Fig. 4 — ^Delay-frequency characteristic of filter. The ordinates of this curve are 

 proportional to the slope of the upper curve of Fig. 3. 



