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Haverfordwest Transmitting Station
The Haverfordwest transmitting station is a broadcasting and telecommunications facility located at Woodstock about to the north east of the town of Haverfordwest, in Pembrokeshire, Wales (). It was originally built by the BBC, entering service in early 1964 acting as a main transmitter for the 405-line VHF television system, and as a repeater for Band 2 VHF FM radio received off-air from Blaenplwyf transmitting station. It is now owned and operated by Arqiva. The site has a guyed steel lattice mast erected on land that is itself about above sea level. The radio broadcasts cover the majority of Pembrokeshire, except the north eastern part of the county. The signals also can reach the outskirts of Cardiff and the Vale of Glamorgan. It currently carries seven analogue FM radio stations, including BBC Radio 1, BBC Radio 2, BBC Radio 3, BBC Radio 4, BBC Radio Cymru, BBC Radio Wales and Radio Pembrokeshire. When UHF analogue television was added in 1990, those services were pro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Haverfordwest VHF-Transmitter - Geograph
Haverfordwest (, ; cy, Hwlffordd ) is the county town of Pembrokeshire, Wales, and the most populous urban area in Pembrokeshire with a population of 14,596 in 2011. It is also a community, being the second most populous community in the county, with 12,042 people, after Milford Haven. The suburbs include the former parish of Prendergast, Albert Town and the residential and industrial areas of Withybush (housing, retail parks, hospital, airport and showground). Haverfordwest is located in a strategic position, being at the lowest bridging point of the Western Cleddau prior to the opening of the Cleddau Bridge in 1975. Topography Haverfordwest is a market town, the county town of Pembrokeshire and an important road network hub between Milford Haven, Pembroke Dock, Fishguard and St David's as a result of its position at the tidal limit of the Western Cleddau. The majority of the town, comprising the old parishes of St. Mary, St. Martin and St. Thomas, lies on the right (we ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
BBC Radio Cymru
BBC Radio Cymru is a Welsh language radio network owned and operated by BBC Cymru Wales, a division of the BBC. It broadcasts on two stations across Wales on FM, DAB, digital TV and online. The main network broadcasts for hours a day from 5:30am to midnight with overnight programming simulcast from the BBC World Service after closedown. A second station, Radio Cymru 2, providing separate music and sports programming, broadcasts on digital and online platforms. Radio Cymru's managing editor is Dafydd Meredydd, a former presenter and producer for both stations. Overview BBC Radio Cymru began broadcasting on the morning of Monday 3 January 1977 – its first programme was an extended news bulletin presented at 6:45am by Gwyn Llewellyn and Geraint Jones. This was followed at 7am by the first edition of the breakfast magazine show ', presented by Hywel Gwynfryn with contributions from a network of local reporters in studios across Wales. The first record played on Radio Cymr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Masts
The tallest structure in the world is the Burj Khalifa skyscraper at . Listed are guyed masts (such as telecommunication masts), self-supporting towers (such as the CN Tower), skyscrapers (such as the Willis Tower), oil platforms, electricity transmission towers, and bridge support towers. This list is organized by absolute height. See List of tallest buildings and structures, List of tallest freestanding structures and List of tallest buildings and List of tallest towers for additional information about these types of structures. Terminology Terminological and listing criteria follow Council on Tall Buildings and Urban Habitat definitions. Guyed masts are differentiated from towers – the latter not featuring any guy wires or other support structures; and buildings are differentiated from towers – the former having at least 50% of occupiable floor space although both are self-supporting structures. List by height This list includes structures with a minimum height o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Digital 3&4
Digital 3&4 is a consortium consisting of ITV plc, STV Group plc and the Channel Four Television Corporation, which operates a multiplex broadcasting from a number of transmitter sites in the United Kingdom, carrying television and radio channels, together with interactive services, from both ITV and Channel 4. Unlike other multiplexes, the regional ITV broadcaster has control over which services are to be broadcast on their allotted amount of the capacity, leading to small regional differences across the country. Channels carried *ITV1 / STV *ITV1 +1 / STV +1 (except Channel Islands) * ITV2 * ITV3 *ITV4 *ITVBe (Channel Islands only, in the GB mainland it's on COM4) *Channel 4 * S4C (Wales only) *Channel 4 +1 *Film4 *More4 * E4 *E4 +1 * Channel 5 * Freeview Information page *Accessible TV Guide See also *List of digital terrestrial television channels (UK) This is a list of the current channels available on digital terrestrial television (DTT) in the United Kingdom, and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
DVB-T
DVB-T, short for Digital Video Broadcasting – Terrestrial, is the DVB European-based consortium standard for the broadcast transmission of digital terrestrial television that was first published in 1997 and first broadcast in Singapore in February, 1998. This system transmits compressed digital audio, digital video and other data in an MPEG transport stream, using coded orthogonal frequency-division multiplexing (COFDM or OFDM) modulation. It is also the format widely used worldwide (including North America) for Electronic News Gathering for transmission of video and audio from a mobile newsgathering vehicle to a central receive point. It is also used in the US by Amateur television operators. Basics Rather than carrying one data carrier on a single radio frequency (RF) channel, COFDM works by splitting the digital data stream into a large number of slower digital streams, each of which digitally modulates a set of closely spaced adjacent sub-carrier frequencies. In the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
BBC1 Wales
BBC One Wales is a Welsh television channel owned and operated by BBC Cymru Wales. It is the Welsh variation of the UK-wide BBC One and is broadcast from Central Square in Cardiff. BBC One Wales broadcasts around three hours of non-news programmes for Wales each week alongside six hours a week of national news for Wales from ''Wales Today ''BBC Wales Today'' is the BBC's national television news programme for Wales, broadcast on BBC One Wales from the headquarters of BBC Cymru Wales in Central Square, Cardiff. According to the BBC, it is the world's longest-running television ne ...''. ''BBC One Wales'' branding is utilised between 6am and around 1am each day with live continuity handled by a team of national announcer/directors. A high-definition simulcast of BBC One Wales launched on 29 January 2013 on Freeview, Freesat, Sky and Virgin Media. On 10 December 2013, BBC One Wales HD was swapped with the SD channel on Sky's EPG for HD subscribers. History The channel was la ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Digital Switchover
The digital television transition, also called the digital switchover (DSO), the analogue switch/sign-off (ASO), the digital migration, or the analogue shutdown, is the process in which older analogue television broadcasting technology is converted to and replaced by digital television. Conducted by individual nations on different schedules, this primarily involves the conversion of analogue terrestrial television broadcasting infrastructure to digital terrestrial (DTT), a major benefit being extra frequencies on the radio spectrum and lower broadcasting costs, as well as improved viewing qualities for consumers. The transition may also involve analogue cable conversion to digital cable or Internet Protocol television, as well as analog to digital satellite television. Transition of land based broadcasting was begun by some countries around 2000. By contrast, transition of satellite television systems was well underway or completed in many countries by this time. It is an inv ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
BBC Two Wales
BBC Two Wales is the national variation of BBC Two for BBC Cymru Wales. It is broadcast from Central Square in Cardiff with live continuity provided by a team of announcer/directors. The channel opts out from the main BBC Two schedule. From 5 November 2001 until 2 January 2009, BBC Two Wales was the name of the analogue service broadcasting to Wales, and was the brand used on the digital service outside the broadcasting hours used by BBC 2W. BBC 2W was the sister channel to BBC Two Wales, until the digital switchover saw the end of analogue broadcasts in Wales. The specific BBC 2W service was closed down and the BBC Two Wales brand used. Programming Programming is much the same as BBC Two, with the exception of some Welsh-oriented programming. Frequently, schedules are changed as a result of an additional programme being inserted and other programmes seen on the BBC Two network being delayed until a slot becomes available. Presentation is parallel to that of BBC Two itself, w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
ITV Wales & West
ITV Wales and West, previously known as Harlech Television (HTV), was an ITV franchise area in the United Kingdom until 31 December 2013, licensed to a broadcaster by the regulator Ofcom. There is no channel, past or present, named "ITV Wales and West". The licence relates to a "dual region", meaning that the franchise area was divided into two sub-regions, Wales and the West of England, each of which had to be served by distinct and separate ITV programme services, as more fully defined within the licence. From January 2014, the dual-region licence was split in two, with ITV Cymru Wales for Wales and ITV West Country covering the both the West of England sub-region and South West England. Both licences remain held by ITV plc through its subsidiary ITV Broadcasting Ltd, and the legal names of the former HTV companies have not yet been changed again. [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
BBC One Wales
BBC One Wales is a Welsh television channel owned and operated by BBC Cymru Wales. It is the Welsh variation of the UK-wide BBC One and is broadcast from Central Square in Cardiff Cardiff (; cy, Caerdydd ) is the capital and largest city of Wales. It forms a principal area, officially known as the City and County of Cardiff ( cy, Dinas a Sir Caerdydd, links=no), and the city is the eleventh-largest in the United Kingd .... BBC One Wales broadcasts around three hours of non-news programmes for Wales each week alongside six hours a week of national news for Wales from '' Wales Today''. ''BBC One Wales'' branding is utilised between 6am and around 1am each day with live continuity handled by a team of national announcer/directors. A high-definition simulcast of BBC One Wales launched on 29 January 2013 on Freeview, Freesat, Sky and Virgin Media. On 10 December 2013, BBC One Wales HD was swapped with the SD channel on Sky's EPG for HD subscribers. History The channel was l ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Light-emitting Diode
A light-emitting diode (LED) is a semiconductor device that emits light when current flows through it. Electrons in the semiconductor recombine with electron holes, releasing energy in the form of photons. The color of the light (corresponding to the energy of the photons) is determined by the energy required for electrons to cross the band gap of the semiconductor. White light is obtained by using multiple semiconductors or a layer of light-emitting phosphor on the semiconductor device. Appearing as practical electronic components in 1962, the earliest LEDs emitted low-intensity infrared (IR) light. Infrared LEDs are used in remote-control circuits, such as those used with a wide variety of consumer electronics. The first visible-light LEDs were of low intensity and limited to red. Early LEDs were often used as indicator lamps, replacing small incandescent bulbs, and in seven-segment displays. Later developments produced LEDs available in visible, ultraviolet (U ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Xenon Flash Lamp
A flashtube (flashlamp) is an electric arc lamp designed to produce extremely intense, incoherent, full-spectrum white light for a very short time. A flashtube is a glass tube with an electrode at each end and is filled with a gas that, when triggered, ionizes and conducts a high-voltage pulse to make light. Flashtubes are used most in photography; they also are used in science, medicine, industry, and entertainment. Construction The lamp comprises a hermetically sealed glass tube, which is filled with a noble gas, usually xenon, and electrodes to carry electrical current to the gas. Additionally, a high voltage power source is necessary to energize the gas as a trigger event. A charged capacitor is usually used to supply energy for the flash, so as to allow very speedy delivery of very high electrical current when the lamp is triggered. Glass envelopes The glass envelope is most commonly a thin tube, often made of fused quartz, borosilicate or Pyrex, which may be straight, o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
