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2ZY
2ZY was the name of a radio station broadcast by the British Broadcasting Company from Manchester, England, between 1922 and 1927. The station aired its first test transmission on 450 metres on 17 May 1922 and began regular broadcasting on 15 November 1922, just a day after sister station 2LO began daily programmes in London. On the same day, 5IT began in Birmingham and eight other station opened in subsequent months across Britain. The frequency chosen for 2ZY was then 375 metres medium wave. The programmes were made and broadcast at first from the Metropolitan-Vickers electricity works in Old Trafford. The ornate iron water tower at the works was the site of the transmitter.
== Relays ==
From 1922 to 1924 all the programmes broadcast by these early stations were made locally as networking was not technically possible, but when quality improved the majority of output was provided by London. The idea of re-transmitting a service in a neighbouring area was tried in May 1924 when the Glasgow service called "5SC" was picked up and rebroadcast on a transmitter in Edinburgh. 2ZY became the first English station to do this when its signal was "relayed" to a transmitter covering Liverpool from 11 June 1924 (the service was called "2LV") and the Leeds/Bradford area on 8 July 1924 (service named "2LS"). Hull was next (service named 6KH on 15 August 1924 and Nottingham followed (service named "5NG") on 16 September 1924. The last of that period was a relay to the Stoke-on-Trent area ("6ST") which began on 21 November 1924. All of these services carried the main output of 2ZY; the most relayed of all the early core BBC radio services; a useful practical experiment for BBC engineers of the day.〔http://www.transdiffusion.org/rmc/bbc/regions1.php〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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