I never heard an I.D. from the two unidentified stations, but from about 0245 to 0315 UTC, I heard a Morse Code transmission of the letters "RR" once per minute. I had no idea, so I searched the Internet for a clue and the consensus was that it was Radio Rebelde transmitting 1 kW from Sancti Spiritus, Cuba, 1409 miles to the south-southwest. I used my Elecraft KX3 and Terk Advantage antenna for this catch.
That is my third Radio Rebelde logging on three different frequencies, but the first two were traditional voice and music broadcasts; the third was something completely different!