6930 kHz 6.930 MHz
LSB mode
Portuguese Language - presumed fishing fleet radio communications using modified HF SSB radios, or SSB marine equipment on out of band frequencies using LSB
Anyway, these guys are running some serious power, one of the two stations (maybe they QSYed from 6925 kHz?) is a solid S9 with SIO 555, the other is S5-S6, but still with good audio