North_Hessary_Tor_transmitting_station Knowpia

North Hessary Tor
	North Hessary Tor Caradon Hill
Mast height	196 metres (643 ft)
Coordinates	50°33′01″N 4°00′30″W / 50.5503°N 4.0083°W
Grid reference	SX578742
Built	1955
Relay of	Caradon Hill
BBC region	BBC South West
ITV region	ITV West Country

Standing on the summit of North Hessary Tor in Devon, England is an FM radio and television transmitter which uses as aerial a 196 metres (643 ft) high guyed mast.

History edit

It was built by BICC for the BBC in 1955 when a transmitter was needed to introduce 405 line television into Devon, alongside Rowridge and Pontop Pike (both 500ft). It now carries a small UHF TV transmitter which serves Princetown and Dartmoor. FM radio transmissions began in 1956 and cover most of Devon and eastern parts of Cornwall, along with Somerset and South Wales as a backup for Wenvoe. It is owned and operated by Arqiva.

Transmitter building and foot of mast

Services listed by frequency edit

Analogue radio (FM VHF) edit

Frequency	kW	Service
88.1 MHz	160	BBC Radio 2
90.3 MHz	160	BBC Radio 3
92.5 MHz	160	BBC Radio 4
97.7 MHz	160	BBC Radio 1
100.0 MHz	160	Classic FM
103.4 MHz	15	BBC Radio Devon

In all BBC publications the national FM ERPs for North Hessary Tor are listed as 160 kW (mixed polarisation): Classic FM list their ERP as 80 kW (horizontal) and 80 kW (vertical) for North Hessary Tor which equates to the same power as the BBC.

The mast covers a large area including Devon, Cornwall, Somerset and South Wales.reaches Ireland's south east especially radio 1 97.7

Digital radio (DAB) edit

Frequency	Block	kW	Operator
225.648 MHz	12B	3.2	BBC National DAB

Analogue television edit

17 December 1954 – 3 January 1985 edit

Frequency	VHF	kW	Service
51.75 MHz	2	15	BBC Television

Until 12 August 2009 edit

Frequency	UHF	kW	Service
743.25 MHz	55	0.012	BBC1 South West
775.25 MHz	59	0.012	Westcountry
799.25 MHz	62	0.012	BBC2 South West
823.25 MHz	65	0.012	Channel 4

Analogue and digital television edit

12 August 2009 – 9 September 2009 edit

Frequency	UHF	kW	Service	System
743.25 MHz	55	0.012	BBC1 South West	PAL System I
775.25 MHz	59	0.012	Westcountry	PAL System I
801.833 MHz	62	0.0025	BBC A	DVB-T
823.25 MHz	65	0.012	Channel 4	PAL System I

Digital television edit

9 September 2009 – June 2013 edit

Frequency	UHF	kW	Operator	System
746.000 MHz	55	0.0025	BBC B	DVB-T2
778.000 MHz	59	0.0025	Digital 3&4	DVB-T
801.833 MHz	62	0.0025	BBC A	DVB-T

From June 2013 edit

In June 2013, BBC A moved from UHF 62 to UHF 50, to allow for the clearance of the 800 MHz band for 4G LTE mobile services.

Frequency	UHF	kW	Operator	System
706.000 MHz	50	0.0025	BBC A	DVB-T
746.000 MHz	55	0.0025	BBC B	DVB-T2
778.000 MHz	59	0.0025	Digital 3&4	DVB-T

References edit

External links edit

The Transmission Gallery: North Hessary Tor Transmitting Station photographs, coverage maps and information
North Hessary Tor Transmitter at thebigtower.com

Summary