Greenhill transmitting station

The Greenhill television relay station is sited on high ground known as "Greenhill" to the south of the towns of Milford Haven and Pembroke Dock in south Wales. It was originally built in the 1980s as a fill-in relay for UHF analogue television covering the communities of Pwllcrochan, Wallaston Cross, Wallaston Green, Rhoscrowther and Hundleton. It consists of a 45 m self-supporting lattice steel mast standing on a hillside which is itself about 75 m above sea level. The transmissions are beamed broadly south to cover its targets. The Greenhill transmission station is owned and operated by Arqiva.

Greenhill
Greenhill transmitting station (Pembrokeshire)
Mast height45 metres (148 ft)
Coordinates51.674275°N 5.003174°W / 51.674275; -5.003174
Grid referenceSM924015
Built1980's
Relay ofCarmel
BBC regionBBC Wales
ITV regionITV Wales

Greenhill transmitter re-radiates the signal received off-air from Carmel about 45 km to the northeast. When it came, the digital switchover process for Greenhill duplicated the timing at Carmel with the first stage taking place on 26 August 2009 and with the second stage being completed on 23 September 2009. After the switchover process, analogue channels had ceased broadcasting permanently and the Freeview digital TV services were radiated at an ERP of 30 W each.[1]

Channels listed by frequency

1980's - 26 August 2009

Being in Wales, Greenhill transmitted the S4C variant of Channel 4.

Frequency UHF kW Service
471.25 MHz 21 0.075 BBC One Wales
495.25 MHz 24 0.075 ITV1 Wales (HTV Wales until 2002)
519.25 MHz 27 0.075 BBC Two Wales
551.25 MHz 31 0.075 S4C

26 August 2009 - 23 September 2009

The UK's digital switchover commenced at Carmel (and therefore at Greenhill and all its other relays) on 26 August 2009. Analogue BBC Two Wales on channel 27 was first to close, and ITV Wales was moved from channel 24 to channel 27 for its last month of service. Channel 24 was replaced by the new digital BBC A mux which started up in 64-QAM and at full power (i.e. 30 W).

Frequency UHF kW Service System
471.25 MHz 21 0.075 BBC One Wales PAL System I
498.000 MHz 24 0.03 BBC A DVB-T
519.25 MHz 27 0.075 ITV1 Wales (HTV Wales until 2002) PAL System I
551.25 MHz 31 0.075 S4C PAL System I

23 September 2009 - present

The remaining analogue TV services were closed down and the digital multiplexes took over on the original analogue channels' frequencies.

Frequency UHF kW Operator
474.166 MHz 21+ 0.03 BBC B
498.000 MHz 24 0.03 BBC A
522.000 MHz 27 0.03 Digital 3&4
See also: List of digital terrestrial television channels (UK)

References
  1. "Freeview on Greenhill TV transmitter". ukfree.tv. Retrieved 2012-04-20.
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