WIDE-BAND TRANSMISSION OVER COAXIAL LINES 



675 



VOICE 

 FREQUENCY 

 CHANNELS 



Zl 



d 



>fVvYyivvvtiv 





FREQUENCY IN | KILOCYCLES PER SECOND 

 48 KC GROUP - 



Fig. 17 — Diagram illustrating frequency allocation for first step of modulation. 



48 KG 

 GROUPS 



p- 



□n 



f » '' " ' T 



60108 



780 4 1020 ^ 1260 4 1500 4 1740 

 FREQUENCY IN KILOCYCLES PER SECOND 



I 240 KC 1 

 GROUPS 



Fig. 18 — Diagram illustrating frequency allocation for two or three steps of 



modulation. 



