Interesting; I checked around 02:00z last night & 10:00z this morning and the signal strength hasn't varied that much down here in my neck of the woods, but when I first stumbled upon it this past weekend I did hear a digital mode underneath briefly (closer to the actual 9216 freq.) although it was weak. That must of been what I heard. I started recording it again around 15:45z today & will let it run for 24hrs. just to see what the signal looks like for the period.