The Radio Society of Great Britain (RSGB) are hosting an International Amateur Radio Activation, The Transatlantic Centenary Tests, on the HF bands to commemorate the centenary of the 
achievement of Amateur Transatlantic communication, during the Transatlantic Tests that were held between 1921 and 1923.
achievement of Amateur Transatlantic communication, during the Transatlantic Tests that were held between 1921 and 1923.The Tests will run from 1 December 2022 to 31 December 2022.
24 December 1922 was when the very first amateur signal from Europe was heard in North America; this was from the RSGB station (G)5WS which was established at Wandsworth in South London, as part of the Third Transatlantic Tests.
Unlike the tests of the 1920s, which mostly consisted of one-way communication, the 2022 tests will encourage world-wide two-way communication with UK & CD based stations.
Special stations will be activated from the UK by RSGB members and Clubs, using original RSGB callsigns from the 1920s.
The Club Log team have kindly agreed to provide the supporting infrastructure for the Tests.
In anticipation of this centenary celebration, with the assistance of Ofcom (the UK licensing authority), the RSGB have renewed five call signs which they held in the 1920s:
G5WS, used for the 1922 tests – “the first to get across”
G5AT, used for the 1923 tests
G6XX, used for the 1923 tests
G6ZZ, used for the first amateur tests on a moving railway train in 1924
G3DR, Scottish Highlands Call – GM3DR.
These historic call signs will be activated by RSGB members and Clubs, using G5WS, G5AT, G6XX, G6ZZ and G3DR (England), GM5WS (Scotland), GW5WS (Wales), GU5WS (Guernsey), GD5WS (Isle of Man), GJ5WS (Jersey) and GI5WS (Northern Ireland).
(Image shows the massive power station chimney at Wandsworth used to support the (G)5WS aerial in December 1922.)
Information and images copyright of the RSGB