Hi Ian and all: I think that your signal appears at 4.30 UTC but then the frequency drifts downwards and disappears of the ARGO´s window. 73 de José, EA1PX, loc IN53TI Automated system seems to work
I'll second Jay's comments. It was fairly quiet overnight, but no signals were visible in the 137.772 - 775 window. Alan called this one correctly! John Andrews, W1TAG