The special amateur radio callsign prefix YL100 has been created to celebrate Latvia's 100th birthday. Latvia will celebrate this centenary on 18th November 2018.
Five different callsigns will be used between the 1st to the 18th November with this YL100 prefix, one from each of 4 Latvia's historical regions and the fifth from the capital city Riga. The callsigns are YL100K, YL100L, YL100R, YL100V, and YL100Z. These call signs will be operated by multiple radio amateurs from the related regions.
Special awards for working YL100 stations on different bands and modes will be issued