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BBC National Programme
The BBC National Programme was a UK radio broadcasting service which was on the air from 9 March 1930 – when it replaced earlier BBC radio stations 2LO and 5XX – until 1 September 1939, when it was subsumed into the BBC Home Service, two days before the outbreak of World War II.
==Foundation==
When the BBC first began transmissions on 14 November 1922, the technology for both national coverage and joint programming between transmitters did not exist – transmitter powers were generally in the region of 1 kilowatt (kW).
Marconi began experimenting with higher power transmissions from a site in Chelmsford under the call sign "2MT" in July 1924. The experiments were successful, leading to the development of both shortwave international broadcasting and longwave national broadcasting, the latter with the call sign 5XX.
In July 1925 the Chelmsford longwave transmitter was relocated to a more central site at Borough Hill near Daventry in Northamptonshire. This provided a "national service" of programmes originating in London, although it remained somewhat experimental and was supplementary to the BBC's local services. Initially the national programme was transmitted on 187.5 kHz longwave but this was later changed, with the opening in 1934 of a new high-power longwave transmitter site at Droitwich, to 200 kHz, which was to remain the BBC's longwave frequency until 1988, when it was moved slightly to 198 kHz. Mediumwave transmitters were used to augment coverage.
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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