thebigtower


midhurst

 


THE MIDHURST TRANSMITTER is the UHF main station for rural West Sussex and parts of the Hampshire border.

It is one of four UHF main stations within the 'BBC South/Meridian West' coverage area, with the adjoining areas of the region towards the south and west respectively served by the main transmitters at Rowridge and Hannington, with the fourth station at Oxford serving its respective area to the north-west.

The Midhurst UHF service area also adjoins East Sussex to the east as served by the Heathfield transmitter and its dependent relays as part of the BBC South East/Meridian East' region, whilst to the north coverage straddles the boundary with the London region along the border with Surrey and some more densely populated towns of West Sussex such as Crawley (near Gatwick Airport). 

TRANSMISSION STRUCTURE

The Midhurst mast is a triangular cross-section stayed structure, with a surmounting UHF antenna-inclusive height of 117.7 metre (386.15ft).  The height of the main structure without the UHF antenna is around 103 metres (338ft).

At this height, it is similar to the structures at Beacon Hill, Lllanddona, Knock More and Rosemarkie.  


 

 

 

 

 

 

 

 

 

Mast Images

 

UHF Coverage Map

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Aerials

 

Site Images Index

 

 

 

 

 

 


STATION HISTORY

Midhurst was constructed as a new-build UHF site by the BBC to serve West Sussex.  Typically, initial transmissions were BBC2 only but BBC1 and ITV were added by the end of 1972.

Regarded as part of the 'south' area of BBC and ITV coverage, the principal 405-line VHF service to the county came from Rowridge (BBC) and Chillerton Down (ITV) on the Isle of Wight, with overlap coverage from London available in places from Crystal Palace (BBC) and Croydon (ITV).

However tests for colour transmission on 625-line UHF concluded the West Sussex area could not be served by the distant signal from Rowridge (the designated UHF main station for the south coast).  With line-of-sight more critical on UHF than VHF, the main obstacle in this instance was the South Downs.

Consequently, a local main station was commissioned for the county with a suitably high and remote site found at Bexleyhill Common approximately three miles north of Midhurst town centre.

Midhurst was ultimately one of four new main stations built for UHF across South and South-East England, alongside Hannington, Heathfield and Bluebell Hill (North Kent).

ANALOGUE UHF CHANNEL ALLOCATION

In common with the south-coast area UHF main stations at Hannington, Heathfield, Dover and Bluebell Hill, the UHF analogue channel allocation at Midhurst was a deviation from standard channel groupings.  In this instance, UHF Channel 68 substituted for Channel 64 resulting in four-channel group 55-58-61-68.

The reason for this was the proximity of these stations to mainland Europe and is explained in more detail on the Hannington page.

DIGITAL SWITCHOVER

Midhurst completed Digital Switchover on 14 March 2012 and has remained within aerial Group C/D (Channels 48-68) throughout its UHF channel allocation history as listed below.


 

Above: Midhurst in May 2011, shortly before much of the forestry seen here was removed.


Mast Images>  Aerials>  Site Images Index>  UHF Coverage Map


 STATION INFORMATION


Location:

Bexleyhill Common, Midhurst, West Sussex

Grid Reference:

SU912250

Landlord:

Arqiva (Legacy: BBC/Crown Castle UK/NGW)

Ground Height:

188.9m

BBC1 Region:

South

Mast Height (+):

117.7m

ITV Region:

Meridian West

Aerial Height (*):

299m

 

UHF Tx Number:

12500

(+)  Height including main UHF antenna

 

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

 

 


  CURRENT TRANSMISSIONS

Digital Television 

 

 

 

Analogue Radio (FM)

 

 

 

 

 

 

 

 

 

Service

: Ch/Polarisation/e.r.p

 

 

 Station:

(MHz)

(e.r.p)

PSB1

: 55 / H / 20kW 

 

 

Spirit FM:

106.6

TBC

PSB2

: 56 / H / 20kW (Ch61 until October 2012) 

 

 

PSB3

: 58 / H / 20kW 

 

 

Digital Radio

COM4

: 54 / H / 10kW (Ch62 until October 2012) 

 

COM5

: 59 / H / 10kW

 

 

BBC National (Block 12B)

COM6

: 50 / H / 10kW

 

 

 Digital One (Block 11D)

 

PRE-DIGITAL SWITCHOVER UHF TRANSMISSIONS

(Shutdown completed 14 March 2012)

Analogue Television 

 

 

 

Digital Television

 

 

 

 

 

 

 

 

 

Service

  Ch/Polar/e.r.p

 

 

 

 

Service

 Ch/Polar/e.r.p

BBC1

: 61 / H / 100kW

 

 

 

 

Mux1

: 56 / H / 2.0kW

BBC2

: 55 / H / 100kW  

 

 

 

 

Mux2

: 65 / H / 2.0kW

ITV1

: 58 / H / 100kW 

 

 

 

 

MuxA

: 62 / H / 2.0kW

Ch4

: 68 / H / 100kW

 

 

 

MuxB

: 59 / H / 2.0kW

Ch5

: No Service

 

 

 

 

MuxC

: 64 / H / 2.5kW

 

  

 

MuxD

: 60 / H / 1.0kW

 

 

 

 

 

 

 

 

 


Site Home