United Kingdom

This day, the 14th February 2022 marks the centenary of the first radio broadcast by Marconi from his Writtle factory in Chelmsford Essex.

Transmissions began on 14 February 1922 from an ex-Army hut next to the Marconi laboratories at Writtle, near Chelmsford in Essex. Initially the station only had 200 watts and transmitted on 700m (428 kHz) on Tuesdays from 2000 to 2030.Two Emma Toc (as it was called in the British Army Signalling Corps spelling alphabet of the day) was a surprising success. The presenter, producer, actor-manager and writer was Captain P. P. Eckersley, a Marconi engineer. His regular announcement; “This is Two Emma Toc, Writtle testing, Writtle testing”.
(Various sources)

Mike Terry via WRTH FB group (2022-02-14)