Black Mountain transmitting station explained

Black Mountain
Height:	228.6m (750feet)
Gridref:	J278727
Built:	1959
Relay:	Divis
Bbc:	BBC Northern Ireland
Itv:	UTV

The Black Mountain transmitting station is a broadcasting and telecommunications facility, situated on land 301m (988feet) above Ordnance Datum (mean sea level) to the west of the city of Belfast, in Northern Ireland . It includes a guyed steel lattice mast which is 228.6m (750feet) https://web.archive.org/web/20060925010233/http://tx.mb21.co.uk/info/sitedata/index.asp in height. The height of the top of the structure above mean sea level is 529m (1,736feet). It is owned and operated by Arqiva.

History

Construction

It was built by BICC.^[1]

Transmission

• 1959: The station is commissioned by the Independent Television Authority to transmit ITV signals (provided by Ulster Television) on 405-line VHF, using Channel 9 (Band III) on high power. Service commences on 1 October.
• 1970: UHF 625-line PAL colour TV begins at high power from the adjacent Divis transmitting station.
• 1975: A low power UHF filler service begins, designed to cover districts close to the station that cannot pick up Divis.
• 1976: FM commercial radio station Downtown Radio (later Cool FM) starts transmissions.
• 1985: VHF 405-line television is discontinued in the UK, having been replaced by the UHF service. The VHF service from Black Mountain closes.
• 1990: FM commercial radio station BCR (later City Beat) now Q Radio begins on 96.7 MHz on 6 April.
• 1997: Analogue transmissions of Channel 5 begin at high power.
• 2001: DAB Digital Radio transmissions start from Score Northern Ireland on block 12D on 6 September.
• 2005: FM station U105 begins on 105.8 MHz on 14 November.
• 2012: On 24 October analogue television services are ceased and replaced by digital multiplexes. NImux launches at this and two other transmitter sites in Northern Ireland transmitting TG4, RTÉ One, RTÉ Two and RTÉ Raidió na Gaeltachta to the region.
• 2019: Further frequency changes took place in September as part of the 700 MHz clearance plan for new mobile telecom services,

Coverage

For high power transmissions of Cool FM, and formerly analogue Channel 5, coverage includes most of central and eastern Ulster, north as far as Ballymena, south as far as Downpatrick and Newry, and west past Dungannon and Cookstown.

Radio stations Q Radio and U105 have a more restricted coverage area, including areas around Greater Belfast, up to Carrickfergus, Antrim, and the shore of Lough Neagh.

With the exception of the NIMM broadcasts, the low power digital TV transmissions are designed only to cover areas of Belfast not already covered by Divis.

Service availability by frequency

Analogue radio

Frequency	kW	Service
96.7 MHz	0.55	Q Radio Belfast
97.4 MHz	3.2	Cool FM
105.8 MHz	0.96	U105

Analogue television

8 August 1975 – 2 November 1982

Frequency	VHF	UHF	kW	Service
	9	—	100	UTV
	—	39	0.025	BBC1 Northern Ireland
	—	45	0.025	BBC2 Northern Ireland
	—	49	0.025	UTV

2 November 1982 – 3 January 1985

Frequency	VHF	UHF	kW	Service
	9	—	100	UTV
	—	39	0.025	BBC1 Northern Ireland
	—	41	0.025	Channel 4
	—	45	0.025	BBC2 Northern Ireland
	—	49	0.025	UTV

3 January 1985 – 30 March 1997

Frequency	UHF	kW	Service
	39	0.025	BBC1 Northern Ireland
	41	0.025	Channel 4
	45	0.025	BBC2 Northern Ireland
	49	0.025	UTV

30 March 1997 – 10 October 2012

Frequency	UHF	kW	Service
	37	50	Channel 5
	39	0.025	BBC One Northern Ireland
	41	0.025	Channel 4
	45	0.025	BBC Two Northern Ireland
	49	0.025	UTV

Analogue and digital television

10 October 2012 – 24 October 2012

Frequency	UHF	kW	Service	System
	37	50	Channel 5	PAL System I
	39	0.025	BBC One Northern Ireland	PAL System I
	41	0.025	Channel 4	PAL System I
	45	0.005	BBC A	DVB-T
	49	0.025	UTV	PAL System I

Digital television

24 October 2012 – present

Digital television replaced the old analogue signals during October 2012. An additional multiplex named NImux including TG4, RTÉ One, RTÉ Two and RTÉ Raidió na Gaeltachta launched at switchover here and at two other transmitters in Northern Ireland. In September 2019 further frequency changes took place.

Frequency	UHF	kW	Operating Name	System
	33 (was 39+)	3	NImux	DVB-T2
	44 (Was 42)	0.005	Digital 3&4	DVB-T
	41 (Was 45)	0.005	BBC A	DVB-T
	47 (Was 49)	0.005	BBC B	DVB-T2

See also

• List of masts
• List of tallest buildings and structures in the United Kingdom
• List of radio stations in the United Kingdom

External links

• The Transmission Gallery: Black Mountain Photographs and Information

Notes and References

1. Times Tuesday 27 October 1959, page 6