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sudbury |
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THE SUDBURY TRANSMITTER is the UHF main station that serves the Suffolk and Essex part of the East Anglia television region. It is sited at Workhouse Green, near the village of Bures, approximately four miles to the south-east of Sudbury town centre. Two other main UHF transmitters at Sandy Heath (Bedfordshire) and Tacolneston (Norfolk) combine with Sudbury to serve the East Anglia region. TRANSMISSION STRUCTURES |
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The Sudbury station is unusual in that it utilises two separate transmission masts. The main structure is a 141.1 metre (463-ft) high triangular cross-section (three-sided) lattice stayed mast. The surmounting fibre-glass (GRP) cylindered UHF aerial extends the overall height to 165.8 metres (544-ft). The secondary structure is also a triangular cross-section mast which stands at a height of 103 metres and was built in 1997 as part of the provision for Digital Terrestrial Television (DTTV) transmission. |
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Aerials (1)> Aerials (2)> Transmission Site (800x600 or 1024x768 version)> Supersize Images> Landscapes> UHF Map |
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June 2008 |
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June 2008 |
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June 2008 |
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| UHF OVERLAP |
| Reception of Sudbury is also possible across those parts of provincial Essex that are intended to be served by the London region and, more significantly, across the northern coastline of Kent where the principal coverage is provided by the Dover transmitter, which is attached to the south-east region. The Dover transmitter in turn reciprocates the overlap from Sudbury by providing duplicated coverage across some coastal parts of Essex. BBC NATIONAL FM RADIO |
| Sudbury does not carry BBC National or any other BBC FM services as these are generally received across the area from either the nearby Manningtree station in North Essex or Tacolneston. |
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June 2008 |
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June 2008 |
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June 2008 |
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June 2008 |
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DIGITAL SWITCHOVER |
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The two stages of Digital Switchover at Sudbury were respectively implemented on 6 July 2011 (DSO1) and 20 July 2011 (DSO2). Major re-engineering work in connection with the switchover commenced at the station in late 2009/early 2010, the most visible development being the installation of a twelve-tier circular aerial on the main mast, which provides the PSB reserve and also the main transmission for the COM multiplexes. The main UHF aerial has been retained within the existing GRP-cylinder installation. (See Aerials (2) and also the latest wide shots for images). AERIAL GROUPING |
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The receiving aerial group for Sudbury was 'B' for analogue-only transmission but reception of all post-digital transmissions has required Group E aerials. This requirements remains based on the permanent post-DSO channel allocations. (See CURRENT TRANSMISSIONS table below) |
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| Transmission Site - June 2008 & May 2010 |
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June 2008 |
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May 2010 |
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STATION HISTORY |
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The Sudbury station was built during 1967/8 by the BBC to provide UHF coverage to the Suffolk and Essex part of the East Anglia region. With positioning and ground elevation even more critical than it had been with VHF, the new transmitter site was deemed necessary for UHF despite the existing BBC station at Manningtree, located barely ten miles south-east of the new site and at the time provider of the equivalent BBC 405-line VHF television to much of the same area. The ITA served the region on 405-line VHF from the Mendlesham transmitter in Suffolk but this had also been considered an inappropriate siting for UHF transmission. Sudbury commenced regular service on 10 November 1968, with transmissions initially confined (as they were with all other UHF stations operational before 15 November 1969) to BBC2. Transmitters for BBC1 and ITV were however in service by November 1970. |
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April 2010 |
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April 2010 |
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April 2010 |
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April 2010 |
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Aerials (1)> Aerials (2)> Transmission Site (800x600 or 1024x768 version)> Supersize Images> Landscapes> UHF Map |
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Location: |
Workhouse Green, nr Bures, Suffolk, CO8 |
Grid Reference: |
TL913377 |
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Landlord: |
Arqiva (Legacy: BBC/Crown Castle/NGW) |
Ground Height: |
70.1m |
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BBC Region: |
East |
Main Mast Height (+): |
141.1m |
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ITV1 Region: |
Anglia East |
Second Mast Height (+): |
103m |
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Aerial Height (*): |
221m |
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UHF Tx Number: |
11500 |
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(*) Average UHF aerial height above sea level (a.o.d) |
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(+) Heights not including UHF antennas - main mast height with UHF cylinder is 165.8m |
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Digital Television |
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Analogue Radio (FM) |
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: Ch/Polarisation/e.r.p |
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Service: |
(MHz) |
(e.r.p) |
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PSB1 |
: 44 / H / 100kW |
None - BBC National from Manningtree and Tacolneston |
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PSB2 |
: 41 / H / 100kW |
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PSB3 |
: 47 / H / 100kW |
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Digital Radio |
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COM4 |
: 49 / H / 14kW (Channel 58 from mid-2012) |
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COM5 |
: 54 / H / 1.5kW (Channel 60 from mid-2012) |
Digital One (Block 11D) |
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COM6 |
: 50 / H / 1.1kW (Channel 56 from mid-2012) |
Essex (Block 12D) |
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Powers to increase to 100kW with permanent channels |
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PRE-DIGITAL SWITCHOVER UHF TRANSMISSIONS |
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(Shutdown completed 20 July 2011) |
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| Analogue Television |
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Digital Television |
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Service |
Ch/Polar/e.r.p |
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Ch/Polar/e.r.p |
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| BBC1 |
: 51 / H / 250kW |
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Mux1 |
: 49 / H / 7.0kW |
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| BBC2 |
: 44 / H / 250kW |
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Mux2 |
: 68 / H / 8.1kW |
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| ITV1 |
: 41 / H / 250kW |
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(+) |
Mux2 |
: 56 / H / 1.1kW |
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| Ch4 |
: 47 / H / 250kW |
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MuxA |
: 48 / H / 5.0kW |
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| Ch5 |
: 35 / H / 50kW |
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MuxB |
: 39 / H / 7.5kW |
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MuxC |
: 54 / H / 1.5kW |
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MuxD |
: 50 / H / 1.1kW |
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(+) = Sudbury B |
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