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ALEXANDRA PALACE - North London
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| ALEXANDRA
PALACE Alexandra Palace is the historic transmitter site where the BBC first carried out its experimental television test transmissions from 1936 to 1937. This is when the testing of two television systems took place between John Logie Baird's 240 line mechanical system and Marconi/EMI's 405 line electronic scan system. The Marconi/EMI system won the support of the BBC, and thus the Baird system was discontinued in February 1937. BBC Television programmes continued from 1937 until September 1939 when war broke out. The Second World War finished in 1945 and television broadcasts recommenced in June 1946. The television signals from Alexandra Palace in the 1940's were broadcast on 41.5 MHz (Band I v.h.f) with a power of 3 kW. The 405 line television transmissions from Ally Pally, as the famous station became known, were later closed and transferred to Crystal Palace. The 405 line television system as a whole was closed down in the early 1980's and today the famous building is home to a low power u.h.f. analogue PAL colour television relay transmitter - which itself may be closed down with the arrival of the digital terrestrial television (DTT) transmission system! Alexandra Palace is also home to DAB digital radio transmitters, and two low power local radio stations - using 103.3 MHz FM (LGR - London Greek Radio) and 107.1 MHz FM (Choice FM). |
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| Photos By Prof.
Tony Davies November 2005 |