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



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



Fig. 20 — Distortion vs. noise characteristics of frequency-shift arrangements at 

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



-24 



-22 -20 



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



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



Fig. 21— Distortion vs. noise characteristics of various arrangements at 120 

 w.p.m. (46 d.p.s.). 



520 



