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thebigtower |
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knock more |
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| THE KNOCK MORE TRANSMITTER is the UHF main station and BBC National FM relay serving a predominantly inland area of Moray within the Scottish Highlands. It is situated on the summit of Knock More, which in turn continues by footpath towards the much higher summit of Ben Aigan approximately one mile to the south-west. The primary UHF coverage area includes the towns of Elgin, Keith, Dufftown and Rothes whilst fringe coverage is provided to coastal locations that include Banff, Findochty and Macduff. In serving these areas, the station complements the coverage from Durris towards the south-east and Rosemarkie towards the north-west. For the purpose of UHF transmission, the station is part of the forwarding chain for off-air programme distribution from Durris to Rosemarkie, the broadcast signal from the latter then being directed back to Knock More for re-broadcast. For the purpose of BBC National FM radio transmission, the station relays the service from Rosemarkie. |
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Aerials> Site/Stay Images (800x600 or 1024x768 version)> Supersize Images> UHF Coverage Maps |
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| TRANSMISSION STRUCTURE |
| The Knock More mast is a 107.1-metre (351-ft) triangular cross-section lattice structure, supported by twelve stay lines. There are three inner stay blocks each supporting two lines and further three outer blocks each supporting one. It is one of a small group of masts nationwide that are around this height, which also includes Rosemarkie. STATION HISTORY |
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Knock More was built by the Independent Broadcasting Authority (IBA) to provide a UHF service from 1974 across the Moray area, to which the equivalent 405-line VHF coverage was provided from either Meldrum or Rosemarkie by the BBC and Durris or Mounteagle by the IBA. With all other main UHF transmitters on the mainland of North-East Scotland constructed on existing VHF sites, this was the only site in the region built from new for UHF and consequently the last to enter service. |
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DIGITAL SWITCHOVER (DSO) |
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Re-engineering for Digital Switchover at Knock More has required the replacement of the main GRP-cylinder-contained UHF aerial at the top of the mast with a new eight-tier system. As for reserve provision, an additional four-tier circular set of panels has been deployed to act in conjunction with the existing pre-DSO digital four-tier circular antenna. See Aerials page for images. The two-stage switchover process was implemented at Knock More as follows - Stage 1 (DSO1) - 8 September 2010 |
BBC Two analogue on Channel 26 ceased broadcasting permanently and PSB1 multiplex (BBCA) launched on Channel 26 Stage 2 (DSO2) - 22 September 2010 |
All other analogue services ceased broadcasting permanently and high powered digital multiplexes launched. UHF AERIAL GROUPING |
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On the basis of the original analogue frequencies, Knock More required Group A receiving aerials. However, based on the original digital multiplexes (MuxA-MuxD inclusive) and the post-DSO COM multiplexes, Group W aerials have been required since for all services to be received. |
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Aerials> Site/Stay Images (800x600 or 1024x768 version)> Supersize Images> UHF Coverage Maps |
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| STATION INFORMATION |
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Location: |
Knock More, Maggieknockater, Morayshire |
Grid Reference: |
NJ321497 |
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Landlord: |
Arqiva (Legacy: ITA/IBA/NTL Broadcast) |
Ground Height: |
356m |
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BBC Region: |
Scotland |
Mast Height: |
107.1m |
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ITV1 Region: |
STV North |
Aerial Height: (*) |
468m |
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UHF Tx Number: |
15300 |
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(*) Average UHF aerial height above sea level (a.o.d) |
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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 |
: 26 / H / 20kW |
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BBC Radio 1: |
97.8 |
500W |
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PSB2 |
: 23 / H / 20kW |
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BBC Radio 2: |
88.2 |
500W |
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PSB3 |
: 29 / H / 20kW |
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BBC Radio 3: |
90.4 |
500W |
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COM4 |
: 53 / H / 10kW |
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BBC Radio 4: |
94.8 |
500W |
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COM5 |
: 57 / H / 10kW |
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BBC Radio Scotland (Highlands): |
94.7 |
500W |
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COM6 |
: 60 / H / 10kW |
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PRE-DIGITAL SWITCHOVER UHF TRANSMISSIONS |
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(Shutdown completed 22 September 2010) |
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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 |
: 33 / H / 100kW |
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Mux1 |
: 34 / H / 1.0kW |
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| BBC2 |
: 26 / H / 100kW |
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Mux2 |
: 30 / H / 1.0kW |
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| ITV1 |
: 23 / H / 100kW |
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MuxA |
: 53 / H / 1.0kW |
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| Ch4 |
: 29 / H / 100kW |
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MuxB |
: 57 / H / 1.0kW |
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| Ch5 |
: No Service |
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MuxC |
: 60 / H / 1.0kW |
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MuxD |
: 56 / H / 1.0kW |
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