Unknown station on 15770 kHz, 1848 UTC Sept. 13, 2018

[Treehouse SWL]

I tripped across this one at 1848-1900 UTC on 15770 kHz. A fair signal, but with sometimes-deep fading in a language that sounded like Russian (could have been something else, as I can only identify about 10 languages by ear). Atmospheric hiss, but not much daytime static and no interference. In the time I heard it, the programming was all talking by a female host. Then a sudden signoff at 1900 UTC. No other station signed on that frequency in the new hour.

I can't find any listing for who might be on this frequency at that time.

[Ct Yankee]

I don't have a definite answer for you but some possibilities. 1) WRMI has used this frequency but not during A18 according to their schedule.  Possible testing but you said you didn't recognize the language. 
2) All India Radio uses the frequency but not at this hour
3) This was a Radio Australia frequency - I have heard both China Radio International and Australian pirates have accessed their former frequencies.  CRI broadcasts in dozens of languages.

BTW, welcome to the board!

[Treehouse SWL]

I figured it wouldn't be WRMI because of the time, and that station tends to give English IDs between programs. And given the mostly lousy reception conditions here that day, I'd ruled out AIR. But CRI is a good possibility I hadn't thought of; they seem to change frequencies and schedules pretty regularly.

Thanks for the welcome. I dove back into SWL just about two months ago for the first time since I was a teenager in the 1980s. It's all changed a lot, but it's still fun. I'm semi-obsessed right now with snagging pirate stations, which is how I found this website and its boards!

[Treehouse SWL]

Mystery solved (presumably)!

On this week's edition of "World of Radio" (ep. 1948), Glenn Hauser reports that WMRI is indeed broadcasting on this frequency in a variety of languages (including Russian) between 1700 and 1945 UTC. This new schedule apparently started around Sept. 11 and will last until at least early October.