My listening from this location has been exclusively after 7pm CST.Remember that "sunset" for Mexican daytimers is the same all year, usually 7 PM local time (unless this has been changed in recent years).
and if you think most mexican AM's power down at night, ive got a bridge in Tijuana/san diego to sell you
I don't know if what I've heard these past few nights is indeed Mexico. The signal is weak, under a strong WSM, and I haven't been able to ID it. The question asked of me was whether I had heard anything from Yucatan. One possibility was 650 if they were staying on day power at night. That may well be the case, but I just don't know at this point. I'll try to keep monitoring 650 to see if the Spanish signal continues and if I can get an ID.