CARRIER TELEGR^iPII METHODS 



515 



were tested while upper and lower adjacent flanking channels were transmit- 

 ting reversals produced by separate vibrating relays at roughly 23 d.p.s. 



-10 -8-6-4-2 2 4 6 6 10 



MARKING LEVEL ON LINE IN DECIBELS (FROM SPACING LEVEL) 



Fig. 17 — Distortion vs. difference between marking and spacing level. 

 Comparison of two-source arrangements. 



T.\BLE I 



CoMP.\RisoN OF Two-Source .Vrr.angements, Effect of Difference between 



M.A.RKING AND Sp.ACING LEVELS 



* Distortion exceeded 10%. 



The distortion with and without the flanking channels operating and the 

 difference in distortion are shown in the following tables, from which it is 

 seen that the various arrangements tested ranked appro.ximately in the fol- 



