[Lowfer] 2200 m WSPR - Puzzles

[JD]

I've got two mysteries at the moment. The first I'm not sure anyone has a
good answer for (WH2XXP has been coming in at distinctly lower level in
mid-day than used to be the case), but a couple of you might be able to
help with the second one.

WA9CGZ came in a couple of times last night , but only twice, so I didn't
think it would be a regular here. But apparently it is--except it doesn't
decode, despite having a signal that is visibly clearer than XXP! (That's
a benefit of having a couple of Argo instances going. One drawback of
using WSPR in isolation as an indicator of propagation is that the signal
may be getting through fine, strength wise, but not decoding for some
other reason than SNR. Tou won't know that unless you're using other tools
simultaneously and comparing results.)

The way I know it's WA9CGZ is from finding it on the same frequency in my
decodes from last night, then searching for decodes of the call from other
reporters...who still were copying him this afternoon! Most notably,
WA3TTS and N8OOU.

Mike and/or Mike, could you check your WSPR windows or the ALL_WSPR.TXT
file and see whether his dT value is near the ±2 second mark this
afternoon? Unfortunately, that's one parameter the WSPRnet database query
does not show. It indicates his drift is negligible, but gives no clue
whether timing may be marginal.

This post has a file attachment showing the perplexing signals:
http://lwca.org/mb/msg/8439.htm

Thanks.

John