CARRIER TELEGRAPHJIETIIODS 



519 



45 



tr 35 



? 30 



24 -22 -20 -18 -16 -14 -12 -10 -8 -6 -4-2 2 



R.M.S. NOISE-TO-CARRIER RATIO ON LINE IN DECIBELS 



Fig. 18 — Distortion vs. noise characteristics of single-sideband, linear on-off and 

 frequency-shift arrangements at 60 w.p.m. (23 d.p.s.). 



45 



Z 30 



< 20 



5 10 ^^ 



-20 -18 -16 -14 -12 -10 -8 -6 -4-2 2 



RMS. NOISE-TO-CARRIER RATIO ON LINE IN DECIBELS 



Fig. 19 — Distortion vs. noise characteristics of two-band arrangem'>;nts at 60 

 w.p.m. (23 d.p.s.). 



