• Source: Droitwich Transmitting Station

The Droitwich transmitting station is a large broadcasting facility for long-wave and medium-wave transmissions, established in 1934 in the civil parish of Dodderhill, just outside the village of Wychbold, near Droitwich in Worcestershire, England (grid reference SO929663). The site is the location of the British Broadcasting Corporation's most powerful long-wave transmitter, which together with the two Scottish long-wave transmitters at Burghead and Westerglen forms a network broadcasting on the same frequency. The masts can be seen to the east from the M5 motorway, between Droitwich and Bromsgrove, as well as to the west from the Herefordshire/Worcestershire border. At night, the two sets of aircraft warning lights are visible from a long distance. The station is owned and operated by Arqiva.




Technical specifications


The long-wave frequency used was 200 kilohertz (frequently referred to by the wavelength, 1,500 metres) until 1 February 1988 when it was changed to 198 kilohertz, and the power is currently 500 kilowatts. The carrier frequency is controlled by a rubidium atomic frequency standard in the transmitter building, enabling the transmission to be used as an off-air frequency standard. For long-wave, a T-aerial is used, which is suspended between two 213-metre-high (700 ft) guyed steel lattice radio masts, which stand 180 metres (590 ft) apart from each other. There are also two guyed mast radiators at the site. The northerly mast is actually the transmitting antenna whilst the southern mast is a passive reflector causing the rf signal to form a cardioid pattern tending in a NE direction so as not to interfere with the similar set up in Bristol. The smaller mast system transmits digital radio signals. The main large system is used for transmitting AM medium-wave radio programmes on 693 kilohertz and 1053 kilohertz and, until 2023, on 1215 kilohertz.




Transmissions


BBC Radio 4 Longwave is transmitted on 198 kHz. This signal also carries radio data encoded using phase modulation, giving a time-of-day signal, and radio teleswitch control signals for Economy 7 electric-heating systems.
BBC Radio 5 Live is broadcast on 693 kHz medium wave (MW), providing coverage for most of the English Midlands and Wales at a signal strength (150 kW) which is one of the strongest for that station, equal to Brookmans Park and second only to Moorside Edge.
During World War II coded messages, which were read during normal programmed broadcasts, were sent to the French Resistance using the transmitter.
In 2011, as a result of budget cuts, the BBC announced that there would be no re-investment in long wave transmissions, which may mean an eventual end to BBC Radio 4 Longwave broadcasts. The same year, The Guardian reported that the transmitter relies upon a pair of glass valves, of which there are fewer than 10 left in the world, and the BBC did not believe it was safe enough to manufacture more, because "slightly faulty" replacements could cause catastrophic failure. In 2023, the BBC announced that it would close down longwave transmissions sometime in 2024 and would end separate programming for the longwave transmitter in March 2024.
It is expected that Radio 4 will end long wave transmissions in 2025. 30 June 2025 will see the cessation of the usage of Radio 4's long wave frequencies for the radio teleswitching service, and it is expected that BBC Radio 4 will switch off its long wave transmitters on, or shortly after, this date.




Reception


The Radio 4 LW signal from Droitwich covers most of England and Wales. There are supplementary long-wave transmitters in Scotland (Burghead and Westerglen, both 50 kW). The station can also be heard clearly in most of the Republic of Ireland, particularly along eastern and southern counties. Reception is also possible in Western Europe, including Italy and Sweden.




Services available



Formerly:




See also


List of masts
List of radio stations in the United Kingdom
List of tallest structures in the United Kingdom
Radio teleswitch




References






External links


The Transmission Gallery: Droitwich Transmitter photographs and information
Radio Teleswitch Services
Radio Rewind Droitwich Page
Specification of BBC phase-modulated transmissions on long-wave
Station History
Droitwich The World's Most Modern Long Wave Transmitter

Kata Kunci Pencarian:

• Droitwich Transmitting Station
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• Croydon transmitting station
• Westerglen transmitting station
• Burghead Transmitting Station
• Worcestershire
• Longwave
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• Dodderhill
• Radio teleswitch