Correction: It's a ham radio operator from Greece (SV9ANK is his callsign) calling QRZ (anyone calling/responding) and CQ (calling any ham) on 20 meters (14MHz ham band, on shortwave) for contesting (hams seeking others, with verification, aka "QSLs", from as many regions/countries for specific awards by their radio clubs).
I thought I heard Thailand mentioned, but I must've misinterpreted that from his "Greek islands".
I hear these sort of things all the time on my shortwave radios, if they have a single-sideband mode, as some do-- That is, AM without the carrier signal, and only using one of the two AM sidebands.
d.m.f.
Correction: It's a ham radio operator from Greece (SV9ANK is his callsign) calling QRZ (anyone calli