First illegal experiments with Ham Radio transmissions in Czechoslovakia were made by technical enthusiasts since early twenties of 20th Century. First license rules were made and accepted by the authorities in the second half of twenties.
Regardless of this fact there were no oficially licensed Amateur Radio Stations in Czechoslovakia until the half of 1930 year. On May, 19. 1930 the first exams of Ham Radio license applicants were made.
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.
May 19, 2020 00:00 UTC – 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)