508 



BELL SYSTEM TECHNICAL JOURNAL 



Outside of the general observation that, as might be expected, the 

 improvement in signal-to-noise ratio at times when the circuit was 

 poor was greater than at times when the circuit was good, no particular 



FIELD STRENGTH IN DECIBELS ABOVE ^^- 

 Fig. 15 — Plot of circuit merit vs. field strength on double sideband. 



connection was found between the improvement obtained by the use 

 of single-sideband and transmission conditions. Only one magnetic 

 storm of any consequence occurred during the test and the transmis- 

 sion was so poor on that day that no results were obtained, and, 

 therefore, no conclusions can be drawn as to the effect of magnetic 

 storms. 



