On Mon, Jan 24, 2022 at 4:28 AM FenDrifter via groups.io
Do you mean radio station call letters? On the MF and VHF broadcast
bands these are still A Thing in the USA, but they seem to have passed
into history elsewhere. Canada still uses them as does Mexico, but
the broadcasters only use them to the extent that they are legally
required to. I think Australia still uses them, too, though with
(IIRC) the "VL" stripped from the front.
Or did you mean some other code?
Peter Laws | N5UWY | plaws plaws net | Travel by Train!