Ferryside_television_relay_station
Ferryside television relay station is a small TV relay in the village of Ferryside, Carmarthenshire, Wales (grid reference SN371104). The Ferryside relay is fed with the off-air signal from Preseli about 17 miles (28 km) to the northwest. It is one of the few UK broadcasting transmitters using a wooden pole as aerial tower. It was built in 1985[1] partly to provide a stronger signal to Ferryside itself, but also to lower Llansteffan on the western side of the estuary which could not receive a usable signal either from Preseli nor from Carmel about 14 miles (22 km) to the northeast.[2]
| Location | Ferryside, Carmarthenshire |
|---|---|
| Mast height | 17 metres (56 ft) |
| Coordinates | 51°46′08″N 4°21′41″W |
| Grid reference | SN371104 |
| Relay of | Preseli |
| BBC region | BBC Wales |
| ITV region | ITV Cymru Wales |
The Ferryside relay is unique because it was chosen as the site of the UK's experimental switchover trial, and as such became the first UK TV transmitter to be converted to digital,[3] complete with the loss of the old analogue TV signal. This mimicked what would actually start to happen later in the decade as the analogue TV signals were progressively turned off in favour of DVB across the country as whole.
At the end of 2004, the relay was equipped to provide the four primary DTT multiplexes (Multiplex 1, 2, A and B) and after a three-month period, all local residents were given Freeview boxes.[4][5] Three of the four analogue services were switched off at midnight on 30 March 2005.
Only BBC Two Wales analogue remained. There had reportedly been some local concerns,[4] caused by the differing content of the BBC 2W digital service compared with BBC Two Wales analogue.
BBC Two Wales analogue was finally switched off as part of the full digital switchover in the Preseli region which happened four years later between 19 August and 16 September 2009.
Analogue television
1985 - 29 November 2004
The site came into service in 1985 with the full complement of four UK terrestrial analogue services in place from the start.
| Frequency | UHF | kW | Service |
|---|---|---|---|
| 471.25 MHz | 21 | 0.023 | BBC1 Wales |
| 495.25 MHz | 24 | 0.023 | HTV Wales |
| 519.25 MHz | 27 | 0.023 | BBC2 Wales |
| 551.25 MHz | 31 | 0.023 | S4C |
Analogue and digital television
29 November 2004 - 30 March 2005
The Ferryside "digital switchover" trial commenced with four of the pre-DSO multiplexes from Presely being re-radiated in the gaps between the existing analogue TV channels. The BBC multiplexes were trialled with the ultra-low ERP of 1 W, the COM multiplexes with 5 W.
| Frequency | UHF | kW | Service | System |
|---|---|---|---|---|
| 471.25 MHz | 21 | 0.023 | BBC1 Wales | PAL System I |
| 489.833 MHz | 23- | 0.001 | BBC Mux B | DVB-T |
| 495.25 MHz | 24 | 0.023 | HTV Wales | PAL System I |
| 513.833 MHz | 26- | 0.001 | BBC Mux 1 | DVB-T |
| 519.25 MHz | 27 | 0.023 | BBC2 Wales | PAL System I |
| 545.833 MHz | 30- | 0.005 | Digital 3&4 Mux 2 | DVB-T |
| 551.25 MHz | 31 | 0.023 | S4C | PAL System I |
| 578.000 MHz | 34 | 0.005 | SDN Mux A | DVB-T |
30 March 2005 - 19 August 2009
BBC One Wales, ITV1 Wales and S4C were all switched off in March 2005 and the four digital multiplexes took over on their final intended channel allocations but at an interim ERP of 5 W each until the rest of the area performed its digital switchover four years later. BBC Two Wales continued as an analogue service (but was moved to S4C's old allocation of channel 31).
It appears that the decision to allocate BBC Mux B to channel 27 was a late change, forcing a variation of licence to be agreed with OFCOM.[6]
| Frequency | UHF | kW | Service | System |
|---|---|---|---|---|
| 474.166 MHz | 21+ | 0.005 | BBC Mux 1 | DVB-T |
| 498.000 MHz | 24 | 0.005 | SDN Mux A | DVB-T |
| 522.000 MHz | 27 | 0.005 | BBC Mux B | DVB-T |
| 545.833 MHz | 30- | 0.005 | Digital 3&4 Mux 2 | DVB-T |
| 551.25 MHz | 31 | 0.023 | BBC Two Wales | PAL System I |
Digital television
19 August 2009 - 16 September 2009
Analogue BBC Two Wales was finally switched off in August 2009 because digital switchover had commenced at the parent transmitter at Preseli and that was the first analogue channel to be shut down there. The new BBC A multiplex started from Preseli and took over the channel allocation previously used by the "BBC Mux 1" multiplex, using 64-QAM modulation and with its full post-DSO power level of 25 W. Unusually, at Ferryside, the final ERP chosen for the digital multiplexes was actually higher than has previously been used for analogue TV.
16 September 2009 - Present
With the completion of DSO at Preseli, the new digital multiplexes took over at Ferryside at their full post-DSO ERPs. Almost uniquely, Ferryside radiates four multiplexes.
| Frequency | UHF | kW | Operator |
|---|---|---|---|
| 474.166 MHz | 21+ | 0.025 | BBC A |
| 498.000 MHz | 24 | 0.025 | BBC B |
| 522.000 MHz | 27 | 0.025 | SDN |
| 545.833 MHz | 30- | 0.005† | Digital 3&4 |
† Some disagreement as to whether this service is 5 W or 25 W. It is usual practice for Digital 3&4 to be radiated with the same ERP as is used for the BBC multiplexes. OFCOM's own post-DSO documentation[7] does agree with the table shown above however.
- "Archived copy" (PDF). Archived from the original (PDF) on 2012-02-06. Retrieved 2013-03-21.
{{cite web}}: CS1 maint: archived copy as title (link) para 3.15(ii) - "Villages tune in to digital trial". BBC News. 2004-12-01. Retrieved 2007-01-06.
- "Report of a digital switchover technical trial at Ferryside and Llansteffan" (PDF). Department for Culture, Media and Sport. July 2005. Retrieved 2007-01-06.[permanent dead link]
- "Report Hails Success of Digital Switchover Trial". Department for Culture, Media and Sport. July 2005. Archived from the original on 2007-01-01. Retrieved 2007-01-06.
- "Archived copy" (PDF). Archived from the original (PDF) on 2012-01-13. Retrieved 2012-03-26.
{{cite web}}: CS1 maint: archived copy as title (link) - "Archived copy" (PDF). Archived from the original (PDF) on 2012-01-17. Retrieved 2012-03-27.
{{cite web}}: CS1 maint: archived copy as title (link)
- Ferryside's entry at mb21 Archived 2007-11-13 at the Wayback Machine
- UKFree's entry for the Ferryside Relay Archived 2011-10-20 at the Wayback Machine