TK.ixs.tri.iMic R.inio TEi.r.riioxn ir.insihission 491 



3 S 7 9 It I 3 3 



Fig. 27 — Monthly averages of diurnal variation of signal to noise ratio, Northolt, 

 Eng. (GKB) received at Belfast, Maine— 20.8 K\V radiated power — 4980 Km— 

 52,000 cycles— 1924 



