708 



THE BELL SYSTEM TECHNICAL JOURNAL, JULY 1952 



5 -30 



-60 -55 -50 -45 -40 -35 -30 -25 -20 -15 -10 -5 5 10 



COMPRESSOR 1000-CYCLE INPUT IN DBM (aT ZERO LEVEl) 



Fig. 16 — Typical over-all channel load characteristic. 



with repeaters will not result in a substantial change of the net loss 

 variation, assuming the repeater section losses do not exceed the range 

 of the regulators. 



The line regulator is assisted by the twin channel regulator, for which 

 a characteristic is shown on Fig. 19. This regulator is similar to the 

 individual channel regulator of N, and serves two channels having a 

 common carrier. This fact alone does not materially change the effective- 

 ness of regulation since the carrier is adjacent to the sideband which 



15 



20 



25 30 35 40 45 



LINE LOSS IN DECIBELS 



Fig. 17 — Typical over-all channel net loss variation, nonrepeatered. 



