Alexandra Palace television station

The transmission mast above the BBC wing of Alexandra Palace, photographed in 2001.

The Alexandra Palace transmitting station in North London (grid reference TQ297901) is one of the oldest television transmission sites in the world. What was at the time called "high definition" (405-line) TV broadcasts on VHF were beamed from this mast from 1936 until the outbreak of World War II. It then lay dormant until it was used very successfully to foil the German Y-Gerät radio navigation system during the last stages of the Battle of Britain. After the war, it was reused for television until 1956, when it was superseded by the opening of the BBC's new main transmitting station for the London area at Crystal Palace. In 1982 Alexandra Palace became an active transmitting station again, with the opening of a relay transmitter to provide UHF television service to parts of North London poorly covered from Crystal Palace.

The transmitter is owned and maintained by Arqiva.

Channels listed by frequency

Analogue radio (FM)

Frequency	kW	Service
103.3 MHz	0.05	London Greek Radio
107.1 MHz	0.1	Choice FM

Digital radio (DAB)

Frequency	Block	kW	Operator
218.640 MHz	11B	0.2	DRG London
222.064 MHz	11D	2	Digital One
223.936 MHz	12A	0.1	Switch London
225.648 MHz	12B	3.2	BBC National DAB
227.360 MHz	12C	0.25	CE London

Analogue television

Frequency	UHF	kW	Service
735.25 MHz	54	0.065	Channel 4
767.25 MHz	58	0.065	BBC One
791.25 MHz	61	0.065	ITV1
815.25 MHz	64	0.065	BBC Two

• Aerial group: C/D
• Polarisation: horizontal

Digital television

Digital television is not currently available from Alexandra Palace, but will be replacing the analogue signals, as part of the digital switchover, during April 2012. However, only 3 of the 6 multiplexes will be available: BBC A, BBC B and D3&4.

Frequency	UHF	kW	Operator
738.0 MHz	54	0.07	BBC B
770.0 MHz	58	0.07	Digital 3&4
794.0 MHz	61	0.07	BBC A

External links

• The Transmission Gallery: Photographs and Information