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thebigtower |
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redruth |
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THE REDRUTH TRANSMITTER provides the main UHF, FM and DAB service to approximately 120,000 people living across the west of Cornwall and The Scilly Isles. It is the most westerly of the five main UHF transmitters serving the south-west of England, operating alongside the stations at Caradon Hill (East Cornwall), Stockland Hill (East Devon), Beacon Hill (South Devon) and Huntshaw Cross (North Devon). In respect of BBC National FM radio transmissions, Redruth is the second-highest powered transmitter in the region, signals being fed to the station by the main regional FM transmitter at North Hessary Tor. TRANSMITTING STRUCTURE AND DIGITAL SWITCHOVER WORK |
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Redruth transmits from a four-sided (square cross-section) lattice stayed mast, with the main structure standing at a height of 152.4 metres (500-ft), extending to a total of 173 metres (568-ft) with the inclusion of the main UHF aerial mounted on top. From 2007 to 2009, the Redruth station and mast underwent re-engineering in preparation for Digital Switchover. The most visibly apparent change to the mast has been the installation of a new reserve UHF aerial, which as with other modified masts takes the form of a cylindrical multi-panel array positioned just below the main UHF antennas at the top of the structure. The Redruth mast already carries a modern multi-panel array as the main UHF antenna at the top, following the replacement of the original fibre-glass (GRP) cylindered UHF aerial stack around 1997/8. Consequently, there was less work to do here than at the majority of the other sites where the original fibre-glass cylindered arrays are being replaced as part of the switchover. (See Aerials page for up-to-date close-up views of the mast). |
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Aerials> Transmission Site (800x600 or 1024x768 version)> UHF Coverage Map> Supersize Images |
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| DIGITAL SWITCHOVER COMPLETION |
| The two stages of the Digital Switchover process at Redruth were implemented as follows - Stage 1 (DSO1) - 8 July 2009 |
| BBC Two analogue (Channel 44) and Mux1 (Channel 39) ceased broadcasting permanently and the first BBC multiplex, BBC A (PSB1), launched. Stage 2 (DSO2) - 5 August 2009 |
| All other analogue services and pre-switchover digital multiplexes ceased broadcasting permanently and the high powered digital multiplexes launched |
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Aerials> Transmission Site (800x600 or 1024x768 version)> UHF Coverage Map> Supersize Images |
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| STATION HISTORY |
| The Redruth station was opened by the BBC on 1 February 1962 in order to bring improved 405-line VHF television coverage to western Cornwall and The Scilly Isles, where previously only fringe-quality reception from the North Hessary Tor transmitter in Dartmoor was possible. Remotely controlled and fed by North Hessary Tor, Redruth was one of the first of a new generation of stations designed to operate automatically and unattended. Transmissions were on VHF Channel 1 at an Effective Radiated Power (e.r.p) of 10kw (peak vision). Redruth became a UHF main station in 1971 and for this purpose was fed by the Caradon Hill transmitter. |
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Transmission Site Images |
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Theses images were taken in June 2007, shortly before the start of preliminary work for Digital Switchover. |
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STATION INFORMATION |
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Location: |
Four Lanes, near Carnkie, Redruth, TR16 6QY |
Grid Reference: |
SW690395 |
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Landlord: |
Arqiva (Legacy: BBC/Crown Castle UK/NGW) |
Ground Height: |
228.6m |
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BBC1 Region: |
South-West |
Mast Height (+): |
152.4m |
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ITV1 Region: |
South-West |
Aerial Height (*): |
381m |
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UHF Tx Number: |
14100 |
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(+) Main structure height only - height including UHF antenna is 173m |
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(*) Average UHF aerial height above sea level (a.o.d) |
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CURRENT TRANSMISSIONS |
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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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Station: |
(MHz) |
(e.r.p) |
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PSB1 |
: 44 / H / 20kW |
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BBC Radio 1: |
99.3 |
25kW |
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PSB2 |
: 41 / H / 20kW |
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BBC Radio 2: |
89.7 |
25kW |
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PSB3 |
: 47 / H / 20kW |
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BBC Radio 3: |
91.9 |
25kW |
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COM4 |
: 48 / H / 10kW |
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BBC Radio 4: |
94.1 |
25kW |
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COM5 |
: 52 / H / 10kW |
BBC Radio Cornwall: |
103.9 |
18kW |
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COM6 |
: 51 / H / 10kW |
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Classic FM: |
101.5 |
25kW |
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Pirate FM: |
102.8 |
10.8kW |
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Digital Radio |
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Atlantic FM: |
107.0 |
10.7kW |
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BBC National (Block 12B) |
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Digital One (Block 11D) |
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Cornwall (Block 11B) |
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PRE-DIGITAL SWITCHOVER UHF TRANSMISSIONS |
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(Shutdown completed 5 August 2009) |
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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 / 100kW |
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Mux1 |
: 39 / H / 1.6kW |
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| BBC2 |
: 44 / H / 100kW |
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Mux2 |
: 42 / H / 1.6kW |
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| ITV1 |
: 41 / H / 100kW |
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MuxA |
: 45 / H / 1.6kW |
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| Ch4 |
: 47 / H / 100kW |
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MuxB |
: 49 / H / 1.6kW |
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| Five |
: 37 / H / 100kW |
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MuxC |
: 43 / H / 2.7kW |
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MuxD |
: 50 / H / 2.0kW |
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| Beacon Hill Caradon Hill Huntshaw Cross North Hessary Tor Stockland Hill |
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