Argyle Radio 6925 USB 2211 UTC Nov 26 2019

[Ray Lalleu]

on 6925 (heard in USB only)
2212 SSTV
2213 off

edit : maybe I could have get the SSTV better, but I was not ready and the SSTV was already at half of the image. I was ready for a second image, but the station went off.

[ChrisSmolinski]

Somewhat confusing...

The earlier transmission on 6925 was in AM mode and fairly strong here: https://www.hfunderground.com/board/index.php/topic,60653.0.html

This transmission was in USB only, and extremely weak. 

No ID on the first transmission. It could possibly have been Argyle Radio as well, of course.

[Pigmeat]

The band had gone long, is my guess.

When I was lil' AM dx'er, Tomas Hood of "73 Magazine" had a bit of advice for us that's served me well over the decades, turn the radio's ferrite core in the opposite direction of your listening direction. If you're a roughly east-west dx'er, turn that radio to N-S position when the MW band is acting funny, and have your Spanish and Portuguese dictionaries ready.

[ChrisSmolinski]

Certainly a possibility, although it was just a few minutes between transmissions, and I did not notice any of the characteristic selective fading in the first (AM) transmission. But yes, it (and other propagation changes) can happen in a matter of minutes, so impossible to rule out.