Italian speaking stations
4630 kHz 4.630 MHz 4.63 MHz possible marine mobile maritime mobile communications. Heard on east coast of USA starting at 0242 UTC on September 7th, 2017.
The Italian language two-way HF SSB traffic has returned to its usual home frequency, 4630 kHz USB mode. Heavy QRM from over the horizon radar or another wideband sweep-tone signal.