by ČAV – Českoslovenští amatéři vysílači, international Association of Czech and Slovak Ham Radio operators in cooperation with Czech Radio Club and other non-organized Ham Radio operators commemorate on the air the 90th Anniversary of first Amateur Radio licenses by activation of special stations and the „OK-90“ Award.
Stations will be on-air from May 19, 2020 00:00 UTC to May 31, 2020 23:59 UTC.
Six special stations will be active to commemorate the first licensees:
OL901AA (in memory of Ing. Mirko Schäferling, OK1AA),
OL901AB (in memory of Pravoslav Motyčka, OK1AB),
OL902AC (in memory of MUC. Zdeněk Neumann, OK2AC),
OL901AF (in memory of Josef Štětina, OK1AF, later OK1AZ),
OL902AG (in memory of Ladislav Vydra, OK2AG),
OL901AH (in memory of Alois Weirauch, OK1AH, later OK1AW).
There will be activated also special stations to commemorate all the historic and actual organizations gathering Ham Radio enthusiasts in Czech Republic:
OL90SKEC (SKEČ, Sdružení krátkovlnných experimentátorů československých 1928-1932).
OL90KVAC (KVAČ, Krátkovlnní amatéři českoslovenští, 1929-1932).
OL90CAV (ČAV, Českoslovenští amatéři vysílači, 1932-1951, 2004-today).
OL90ROH (Revoluční odborové hnutí, 1951-1953).
OL90SVAZARM (Svaz pro spolupráci s armádou, 1953-1990),
OL90CRK (Československý, později Český radioklub, od r. 1990-today)
More info: https://ok90.hamqth.com/
I will be active as OL901AB on 30m digi (mostly FT-8), and as OL90CAV on 40m digi (mostly FT-8).
From „OK-90“ website.