North Hessary Tor

North Hessary Tor
Mast with worker at base

The North Hessary Tor is a hill 517 metres high just above Dartmoor Prison, in Princetown within Dartmoor Forest civil parish, which is located in the borough of West Devon, Devon, England (grid reference SX578742). The tor is one of the boundary points mentioned in the perambulations of the Forest of Dartmoor.[1]

Situated on the summit is an FM radio and television transmitter which uses as aerial a 196.0 metre (643 ft) high guyed mast. It was built by the BBC in 1955 when a transmitter was needed to introduce 405 line television into Devon. 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. It is owned and operated by Arqiva.


Services listed by frequency

Analogue radio (FM VHF)

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

NB In all BBC publications the National FM erp for North Hessary Tor are listed as 160 kW (Mixed Polarisation) Classic FM list their erp as 80 kW (Horizonal) and 80 kW (Vertical) for North Hessary Tor which is the same as the BBC eg 160 kW (Mixed Polarisation) erp.

Digital Radio: 12B BBC National Multiplex (3.2kW erp)

Analogue television

Analogue television was switched off at this mast between 12 August 2009, when BBC Two was switched off, and 9 September 2009 when the remaining three were switched off. They were replaced by three digital public service multiplexes.

Frequency UHF kW Service
743.25 MHz 55 0.012 BBC One
775.25 MHz 59 0.012 ITV1
799.25 MHz 62 0.012 BBC Two
823.25 MHz 65 0.012 Channel 4

Digital television

Frequency UHF kW Operator
746.0 MHz 55 0.0025 BBC B
778.0 MHz 59 0.0025 Digital 3&4
801.8 MHz 62- 0.0025 BBC A

See also

  • List of masts
  • List of tallest buildings and structures in Great Britain


  1. ^ Brewer, Dave (2002). Dartmoor Boundary Markers. Tiverton, Devon: Halsgrove. p. 34. ISBN 1-84114-172-0. 

External links

Mast and base station

Coordinates: 50°33′1″N 4°0′30″W / 50.55028°N 4.00833°W / 50.55028; -4.00833

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