ULTRA-SHORT-WAVE TRANSMISSION 



493 



tions, a record speed of ^'^ inch (1.6 cm.) per minute was sufficient. 

 This was our standard speed. Amplitude changes up to 40 db and 

 fading rates up to 5 fades per minute were observed. 



It is difficult to describe the fading in any other way than by the 

 records. From a transmission standpoint a curve giving the per cent 

 of time during which the signal is above the abscissa value is useful. 



8:00 P.M. 



4:30 A.M 



5:00 A.M. 

 EASTERN STANDARD TIME 



Fig. 2 — Fading extremes, vertically polarized transmission; inverted "V" antennas. 



Fig. 3- 



8:00 A.M. 



8:30 A.M. 

 EASTERN STANDARD TIME 



9:00 A.M. 



-Extreme amplitude, normal fading rate, vertically polarized transmission; 

 inverted "V" antennas. 



