OVERSEAS RADIO EXTENSION 250 



by intervals of about one-twelfth of a second. By following these 

 columns down, the progressive change which occurs in the distortion 

 of the voice band may readily be seen. The worst distortion occurs at 



^\ 



X. 



Fig. 10 — Distortion of voice band in short-wave transmission. 



times when the carrier itself is blotted out. Tests have indicated that 

 the use of single side band is of value in minimizing this type of dis- 

 tortion. Experiments have been in progress for some time looking 

 to the evaluation of gain to be expected along these lines from the 



