the screen shot is as follows :-
what you make of that.
grunge at 512 KHz is the SDR local osc.
transmission just started up at 2100utc on 518 KHz but quite weak, but there
are much stronger images at 514.5 & 513 KHz & a very strong steady
signal at 516.35 KHz with lots of spurious signals down to about 498.500
ended at 2109utc.
I will upload
the screen shot to my web site.
Gary - G4WGT -