thebigtower


rosneath

 


THE ROSNEATH TRANSMITTER is a UHF relay of the Darvel main station and the basis of one of the five post-digital switchover transmitter groups in the STV Central area.  It also transmits national and local radio on FM and national radio on DAB.

It is located near the south-eastern coastline of the Rosneath peninsula which is situated to the north of Greenock and west of Helensburgh across the Firth of Clyde.

Being positioned on a slope towards a coastline, the mast is a highly visible landmark from the nearest opposing coastline around Helensburgh, but is virtually unseen (apart from the protruding top section) around Rosneath itself.  (As a consequence, complete views of the mast are either distant or on-site at very close range).

TRANSMISSION STRUCTURE  

The Rosneath mast is a 107 metre (351-ft) triangular-cross-section lattice stayed structure with a surmounting UHF main antenna and is supported by twelve stay lines which descend in pairs to a total of six ground anchoring blocks.

Rosneath is one of a small group of television relay stations to have served purely as such for which a structure above 60 metres is necessary to achieve the required aerial height, resulting in the provision of a stayed mast.

This group most notably includes the stations at Lancaster, Londonderry, Arfon and Strabane.  Of these, the former two feature structures of simliar height to Rosneath, whilst the latter two share its functional history, having also served originally as ITA 405-line VHF relay transmitters.


 

 

 

 

 

 

 

 

 

 

 

 

 

Mast Images

 

Site Images

 

Aerials

 

 

 

 

 

 

 

 


STATION HISTORY

The Rosneath transmitter was constructed by the Independent Television Authority (ITA) and entered service on 13 December 1968, transmitting ITV on VHF Channel 13 as a relay of the Black Hill transmitter.

It was the second of three relays built to support the 405-line service from Black Hill, the first station opening at Rothesay on 30 August 1968 and the final station opening at Lethanhill (Ayrshire) on 31 January 1969.

Rosneath was also utilised from the outset by the BBC as a relay for their Band I 405-line VHF service, carrying forward the signals from Kirk O'Shotts on Channel 2.

Both BBC and ITV UHF colour transmissions commenced on 13 August 1976 with Channel 4 a late addition to that network in March 1984.

 

DIGITAL SWITCHOVER

The process of switchover at Rosneath was completed on 11 May 2011 (Stage 1) and 25 May 2011 (Stage 2) in accordance with the parent station at Darvel.

The PSB1 (BBC A) multiplex launched under Stage 1 on UHF Channel 61 (analogue STV pre-switchover) but was changed to Channel 49 from 17 April 2013 under a regional retune.

Since switchover, Rosneath has transmitted both a vertically and horizontally polarised signal, the former being the main higher-power output serving the wider coverage area, whilst the latter is a lower powered signal directed north towards the town of Rosneath itself.

The main vertically polarised service has an Effective Radiated Power (e.r.p) of 2kW, representing a ten-times increase over the pre-switchover digital multiplexes, which ran at 200W, whilst also representing the near-nationwide standard 20% power of the old analogue service, reducing from 10kW.

 


STATION INFORMATION


Location:

Gallow Hill, Rosneath, Argyll and Bute

Grid Reference:

NS258811

Landlord:

Arqiva (Legacy: ITA/IBA/NTL)

Ground Height:

107m

BBC Region:

Scotland

Mast Height:

107m

ITV Region:

STV Central

UHF Tx Number:

15211


  CURRENT TRANSMISSIONS

Digital Television

 

 

 

Analogue Radio (FM)

 

 

 

 

 

 

 

 

 

Service

: Ch/Polarisation/e.r.p

 

 

 Station:

(MHz)

(e.r.p)

PSB1

: 49 / V / 2kW 

 

 

BBC Radio 1:

98.8

32W

PSB1

: 49 / H / 8W 

 

 

BBC Radio 2:

89.2

32W

PSB2

: 58 / V / 2kW 

 

 

BBC Radio 3:

91.4

32W

PSB2

: 58 / H / 8W 

 

 

BBC Radio 4:

103.8

32W

PSB3

: 54 / V / 2kW

BBC Radio Scotland:

93.6

32W

PSB3

: 54 / H / 8W

 

 

Clyde 1:

103.1

10W

COM4

: 53 / V / 2kW

 

 

 Heart FM Scotland:

 101.1

 10W

COM4

: 53 / H / 8W

 

 

 Your Radio:

106.9

 10W

COM5

: 57 / V / 2kW

 

 

 

COM5

: 57 / H / 8W

 

 

Digital Radio

COM6

: 60 / V / 2kW

 

 

BBC National (Block 12B)

COM6

: 60 / H / 8W

 

 

Digital One (Block 12A)

 

 

 

 

 

 

 

PRE-DIGITAL SWITCHOVER UHF TRANSMISSIONS

(Shutdown completed 25 May 2011)

Analogue Television 

 

 

 

Digital Television

 

 

 

 

 

 

 

 

 

Service

  Ch/Polar/e.r.p

 

 

 

 

Service

 Ch/Polar/e.r.p

BBC1

: 58 / H / 10kW

 

 

 

 

Mux1

: 67 / H / 200W

BBC2

: 64 / H / 10kW  

 

 

 

 

Mux2

: 53 / H / 200W

STV

: 61 / H / 10kW 

 

 

 

 

MuxA

: 57 / H / 200W

Ch4

: 54 / H / 10kW

 

 

 

 

MuxB

: 60 / H / 200W

Ch5

: No Service

 

 

 

 

MuxC

: 63 / H / 200W

 

  

 

 

MuxD

: 48 / H / 200W


Black Hill      Craigkelly        Darvel

 

Site Home