The Berlin Convention established 500kc/s as the distress and calling frequency and also agreement that SOS would be the international distress signal.
Amateur radio stations were on air to celebrate this centenary. GB500KCS from South West Cornwall, DL500KHZ from various German amateur stations and IY1SP/500KCS from La Spezia. Click box below for details of how they got on and award managers.
Press the hyperlink below to obtain details of your chosen station:-
