thebigtower


knock more

 


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.


Aerials>  Site/Stay Images (800x600 or 1024x768 version)>  Supersize Images>  UHF Coverage Maps


 


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 

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.


 

 

 

 

 

 

 

 

Aerials

 

Site & Stay Images  800x600  1024x768

 

UHF Coverage Maps

 

 


DIGITAL SWITCHOVER (DSO)

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

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.


 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

800x600   1024x768

 

800x600   1024x768

 

800x600   1024x768

 

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Aerials>  Site/Stay Images (800x600 or 1024x768 version)>  Supersize Images>  UHF Coverage Maps


 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

800x600   1024x768

 

800x600   1024x768

 

800x600   1024x768

 

800x600   1024x768

 

 


STATION INFORMATION


Location:

Knock More, Maggieknockater, Morayshire

Grid Reference:

NJ321497

Landlord:

Arqiva (Legacy: ITA/IBA/NTL Broadcast)

Ground Height:

356m

BBC Region:

Scotland

Mast Height:

107.1m

STV Region:

North

Aerial Height: (*)

468m

 

UHF Tx Number:

15300

(*) Average UHF aerial height above sea level (a.o.d)

 


  CURRENT TRANSMISSIONS

Digital Television  

 

Analogue Radio (FM)

 

 

 

 

 

 

 

 

 

Service

: Ch/Polarisation/e.r.p

 

 

 Service:

(MHz)

(e.r.p)

PSB1

: 26 / H / 20kW 

 

 

BBC Radio 1:

97.8

500W

PSB2

: 23 / H / 20kW 

 

 

BBC Radio 2:

88.2

500W

PSB3

: 29 / H / 20kW

 

 

BBC Radio 3:

90.4

500W

COM4

: 53 / H / 10kW

 

 

BBC Radio 4:

94.8

500W

COM5

: 57 / H / 10kW 

 

 BBC Radio Scotland (Highlands):

94.7

500W

COM6

: 60 / H / 10kW

 

 

 

 

 

 

 

PRE-DIGITAL SWITCHOVER UHF TRANSMISSIONS

(Shutdown completed 22 September 2010)

Analogue Television 

 

 

 

Digital Television

 

 

 

 

 

 

 

 

 

Service

  Ch/Polar/e.r.p

 

 

 

 

Service

 Ch/Polar/e.r.p

BBC1

: 33 / H / 100kW

 

 

 

 

Mux1

: 34 / H / 1.0kW

BBC2

: 26 / H / 100kW  

 

 

 

 

Mux2

: 30 / H / 1.0kW

ITV1

: 23 / H / 100kW 

 

 

 

 

MuxA

: 53 / H / 1.0kW

Ch4

: 29 / H / 100kW

 

 

 

 

MuxB

: 57 / H / 1.0kW

Ch5

: No Service

 

 

 

 

MuxC

: 60 / H / 1.0kW

 

 

 

 

 

 

MuxD

 : 56 / H / 1.0kW

 

 

 

 

 

 

 

 


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