CUBA that offset minus 800 Hertz TX unit originate from former USSR relay
of Radio Moscow at Bejucal site of RadioCuba. It's in turn use from time to
time.

At other time of the day used as
1200-1500  7340 BEJ 50kW 110 Ant  Spanish  Antilles ex 9640 kHz
or
1200-1500 13740 BEJ 50kW 160 SoAm Spanish  Buenos Aires ex13780 kHz B-18
Maybe an alternative TX unit of few remained 50 kW type TXs at this site.
See below also Ivo's monitoring of clandestine spy number services.
Technical data
15370 kHz 135degrees azimuth. #A-27-antenna in nomenclatura figures,
HRS 4/4/1 type, aimed at Rio de Janeiro Brazil, Buenos Aires Argentina in
South America, I guess 23.30-01.30 UT is right their scheduled time.
73 wb  df5sx
wwdxc