Radio Free Asia 15430 am 1515 utc 9 June 2018

[Ct Yankee]

 Good reception in Chinese from North Mariana

1515z Two OM's speaking in Chinese, every once in awhile some other broadcast underneath it - misdirected attempt at jamming?

[MDK2]

Chances are that the signal underneath is RFA and the one you heard was the jamming, but that can depend on your position relative to the Tx. I can usually get RFA better when it's coming from Tinian because that Tx is closer to me than anything in China.

I believe that CRN1 has time pips at the top of the hour but RFA does not, so that's one way to tell which one you've got. Another is to look for CNR1 as a standalone, non-jamming SWBC and compare audio. In my experience it's usually CNR1 jamming, because I think they use multiple transmitters for the same frequency, thus more effectively drowning out the undesired signal as well as having backup in case one transmitter has a technical problem.

Finally, as far as I can tell from the few times I've listened to RFA's online stream, it's always been news/talk format. If you're copying a program of mostly music, it's CNR1.

I hope this helps. Chinese jamming makes DXing outside Mandarin broadcasts very challenging, and one has to adopt an attitude that they're copying CNR1 until they can prove that they have something else.