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thebigtower |
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rosneath |
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| 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. The station was originally built as an ITV 405-line VHF relay and with the intention of serving as one of the four eventual UHF main transmitters for the STV region. In the event, Rosneath was for UHF purposes scaled back to a relay station, possibly as a result of the later decision to site a main station for the west coast and islands at Torosay. ITA Maps indicating Rosneath as a future UHF main station can be found here. TRANSMISSION STRUCTURE |
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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 stayed mast was provided, although in this instance this was most likely based on the original scheduling of this site as a UHF main station. Other relays with high masts notably includes 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. |
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| 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. |
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| 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. |
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STATION INFORMATION |
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Location: |
Gallow Hill, Rosneath, Argyll and Bute |
Grid Reference: |
NS258811 |
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Landlord: |
Arqiva (Legacy: ITA/IBA/NTL) |
Ground Height: |
107m |
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BBC Region: |
Scotland |
Mast Height: |
107m |
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ITV Region: |
STV Central |
UHF Tx Number: |
15211 |
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CURRENT TRANSMISSIONS |
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Digital Television |
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Analogue Radio (FM) |
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: Ch/Polarisation/e.r.p |
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Station: |
(MHz) |
(e.r.p) |
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PSB1 |
: 49 / V / 2kW |
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BBC Radio 1: |
98.8 |
32W |
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PSB1 |
: 49 / H / 8W |
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BBC Radio 2: |
89.2 |
32W |
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PSB2 |
: 58 / V / 2kW |
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BBC Radio 3: |
91.4 |
32W |
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PSB2 |
: 58 / H / 8W |
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BBC Radio 4: |
103.8 |
32W |
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PSB3 |
: 54 / V / 2kW |
BBC Radio Scotland: |
93.6 |
32W |
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PSB3 |
: 54 / H / 8W |
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Clyde 1: |
103.1 |
10W |
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COM4 |
: 53 / V / 2kW |
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Heart FM Scotland: |
101.1 |
10W |
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COM4 |
: 53 / H / 8W |
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Your Radio: |
106.9 |
10W |
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COM5 |
: 57 / V / 2kW |
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COM5 |
: 57 / H / 8W |
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Digital Radio |
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COM6 |
: 60 / V / 2kW |
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BBC National (Block 12B) |
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COM6 |
: 60 / H / 8W |
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Digital One (Block 12A) |
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PRE-DIGITAL SWITCHOVER UHF TRANSMISSIONS |
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(Shutdown completed 25 May 2011) |
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| Analogue Television |
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Digital Television |
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Service |
Ch/Polar/e.r.p |
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Service |
Ch/Polar/e.r.p |
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| BBC1 |
: 58 / H / 10kW |
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Mux1 |
: 67 / H / 200W |
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| BBC2 |
: 64 / H / 10kW |
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Mux2 |
: 53 / H / 200W |
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| STV |
: 61 / H / 10kW |
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MuxA |
: 57 / H / 200W |
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| Ch4 |
: 54 / H / 10kW |
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MuxB |
: 60 / H / 200W |
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| Ch5 |
: No Service |
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MuxC |
: 63 / H / 200W |
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MuxD |
: 48 / H / 200W |
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