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140-451: The Computer Originated World (COW) was the method of creating the BBC1 symbol that was used between 18 February 1985 and 16 February 1991. It was later used by the international, commercial television service BBC World Service Television from its launch until 26 January 1995. The Computer Originated World replaced the previous Noddy globe symbols at 7 pm on 18 February 1985. Unusually,

280-621: A PCB had holes drilled for each wire of each component. The component leads were then inserted through the holes and soldered to the copper PCB traces. This method of assembly is called through-hole construction . In 1949, Moe Abramson and Stanislaus F. Danko of the United States Army Signal Corps developed the Auto-Sembly process in which component leads were inserted into a copper foil interconnection pattern and dip soldered . The patent they obtained in 1956

420-426: A PCB may have a coating that protects the copper from corrosion and reduces the chances of solder shorts between traces or undesired electrical contact with stray bare wires. For its function in helping to prevent solder shorts, the coating is called solder resist or solder mask . The pattern to be etched into each copper layer of a PCB is called the "artwork". The etching is usually done using photoresist which

560-546: A black sidebar to the left of the screen. The remainder of the screen featured a picture of the programme and the programme name located at the bottom. However, the programme slides were still optically developed. This was changed in September 1988 when the introduction of Quantel Paintbox allowed captions to be created digitally. The design was altered slightly with the BBC1 legend made more textured, slightly smaller and moved to

700-642: A converted wing of the Alexandra Palace in London. On 1 September 1939, two days before Britain declared war on Germany, the station was taken off air with little warning, with the last programme to be shown being a Mickey Mouse cartoon (the 1933 short Mickey's Gala Premier ); the government was concerned that the VHF transmissions would act as a beacon to enemy aircraft that could bomb London. BBC Television returned on 7 June 1946 at three o'clock in

840-460: A flat, narrow part of the copper foil that remains after etching. Its resistance , determined by its width, thickness, and length, must be sufficiently low for the current the conductor will carry. Power and ground traces may need to be wider than signal traces . In a multi-layer board one entire layer may be mostly solid copper to act as a ground plane for shielding and power return. For microwave circuits, transmission lines can be laid out in

980-418: A general estimate of the board complexity. Using more layers allow for more routing options and better control of signal integrity, but are also time-consuming and costly to manufacture. Likewise, selection of the vias for the board also allow fine tuning of the board size, escaping of signals off complex ICs, routing, and long term reliability, but are tightly coupled with production complexity and cost. One of

1120-786: A liquid ink that contains electronic functionalities. HDI (High Density Interconnect) technology allows for a denser design on the PCB and thus potentially smaller PCBs with more traces and components in a given area. As a result, the paths between components can be shorter. HDIs use blind/buried vias, or a combination that includes microvias. With multi-layer HDI PCBs the interconnection of several vias stacked on top of each other (stacked vías, instead of one deep buried via) can be made stronger, thus enhancing reliability in all conditions. The most common applications for HDI technology are computer and mobile phone components as well as medical equipment and military communication equipment. A 4-layer HDI microvia PCB

1260-625: A lot of help from my friends", with the channel still under criticism, following the start of new programming which Alan introduced a year earlier, and the number of summer repeats. £175 million was spent on 80 hours of original drama produced, enchantment to the arts with an extended 26-week run for Omnibus , and documentaries with The Downing Street Years , new wildlife series and an eight-month look at Sheffield's Children's hospital, while Goodnight Sweetheart , Grace & Favour and The Danny Baker Show were new comedy series. Lois & Clark: The New Adventures of Superman included in

1400-625: A major global study of the BBC by the Populus polling organisation found BBC One to be rated the highest-quality TV channel in the world, with BBC Two coming in third place. BBC One is available via most major television providers in the United Kingdom. The BBC began its own regular television programming from the basement of Broadcasting House , London, on 22 August 1932. The channel officially began regular broadcasts on 2 November 1936 from

1540-583: A non-conductive substrate. Electrical components may be fixed to conductive pads on the outer layers, generally by means of soldering , which both electrically connects and mechanically fastens the components to the board. Another manufacturing process adds vias , drilled holes that allow electrical interconnections between conductive layers. Printed circuit boards are used in nearly all electronic products. Alternatives to PCBs include wire wrap and point-to-point construction , both once popular but now rarely used. PCBs require additional design effort to lay out

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1680-446: A planar form such as stripline or microstrip with carefully controlled dimensions to assure a consistent impedance . In radio-frequency and fast switching circuits the inductance and capacitance of the printed circuit board conductors become significant circuit elements, usually undesired; conversely, they can be used as a deliberate part of the circuit design, as in distributed-element filters , antennae , and fuses , obviating

1820-552: A position vacated by BBC Three , which had been switched to internet-only six weeks earlier. Changes in Scotland, Wales, and Northern Ireland were also scheduled but delayed for 'technical reasons'. On 22 November 2022, the BBC announced that BBC One will finally be regionalised on their HD channels. This move started on Sky Glass, followed by Virgin Cable, and then in the 2023 new year, HD programmes are launched on satellite. With

1960-579: A post she took up on 1 November 2000. She had previously been sounded out about the job in 1997 after Michael Jackson 's departure, but had turned down the opportunity as she felt she was then not yet experienced enough. During Heggessey's five years in charge, BBC One's audience share fell by 19.9%, to 23%, although this was in the context of declining audience figures across all British television channels due to increased competition from multichannel digital television . However, in 2001 BBC One overtook its main rival ITV in terms of annual audience share for

2100-649: A print-and- etch method in the UK, and in the United States Max Schoop obtained a patent to flame-spray metal onto a board through a patterned mask. Charles Ducas in 1925 patented a method of electroplating circuit patterns. Predating the printed circuit invention, and similar in spirit, was John Sargrove 's 1936–1947 Electronic Circuit Making Equipment (ECME) that sprayed metal onto a Bakelite plastic board. The ECME could produce three radio boards per minute. The Austrian engineer Paul Eisler invented

2240-600: A proposal which met the requirements: a ceramic plate would be screenprinted with metallic paint for conductors and carbon material for resistors , with ceramic disc capacitors and subminiature vacuum tubes soldered in place. The technique proved viable, and the resulting patent on the process, which was classified by the U.S. Army, was assigned to Globe Union. It was not until 1984 that the Institute of Electrical and Electronics Engineers (IEEE) awarded Harry W. Rubinstein its Cledo Brunetti Award for early key contributions to

2380-603: A result. His future was deemed uncertain following critical comments from Sir Michael Lyons , Chairman of the BBC Trust , and he resigned on 5 October 2007. In 2009, a report published by the BBC Trust found scheduling changes had led to a decrease in viewers. This was especially noticeable for Blue Peter and Newsround , two of CBBC's flagship programmes; Blue Peter which recorded its lowest viewing numbers since it started in 1958, and Newsround with fewer than 100,000 viewers compared to 225,000 in 2007. As part of

2520-514: A station clock, and perceived lack of a 'serious ident', also put the BBC in an embarrassing situation just one day into the new look with the death of the Queen Mother . One of Heggessey's most notable decisions and last major success at the channel was the recommissioning of the science-fiction drama series Doctor Who , which had been a popular hit in previous decades but ceased production in 1989 . Heggessey and Jane Tranter recommissioned

2660-409: A steady pace throughout, and had the effect of a spotlight added to the surface. The continents were placed in such a way that the continents appeared to float on the water. The caption had the option of displaying the legend ' Ceefax 170' and later 'Ceefax 888' in reference to the subtitles available with the programme. Regional variations also included a legend with the region name, also in gold, below

2800-416: A year was spent on narrowing the gap on ITV's ratings lead, since a few months prior to this the channel had been criticised for its Autumn schedule, having tired formats, uninspiring scheduling of new programmes and poor scripts. Wogan was replaced with Eldorado , in early July 1992, but this was itself cancelled a year later. Alan Yentob launched the 1993 Autumn schedule calling it "My first try with

2940-403: A yellow LED that lights up when that card is in use. The controller unit has a 24-bit sequence address bus giving access to 16 Mbytes, but the equipment has space for only 7.5 Mbytes, and is fitted for 5 Mbytes. The controller also addresses the fixed memory through a 19-bit address bus . This memory uses identical cards to the sequence memory and four are in parallel. A result of this is that

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3080-440: Is cotton paper impregnated with phenolic resin , often tan or brown. When a PCB has no components installed, it is less ambiguously called a printed wiring board ( PWB ) or etched wiring board . However, the term "printed wiring board" has fallen into disuse. A PCB populated with electronic components is called a printed circuit assembly ( PCA ), printed circuit board assembly or PCB assembly ( PCBA ). In informal usage,

3220-455: Is fire retardant , the dielectric constant (e r ), the loss tangent (tan δ), the tensile strength , the shear strength , the glass transition temperature (T g ), and the Z-axis expansion coefficient (how much the thickness changes with temperature). There are quite a few different dielectrics that can be chosen to provide different insulating values depending on the requirements of

3360-437: Is a common engineering error in high-frequency digital design; it increases the cost of the boards without a corresponding benefit. Signal degradation by loss tangent and dielectric constant can be easily assessed by an eye pattern . Moisture absorption occurs when the material is exposed to high humidity or water. Both the resin and the reinforcement may absorb water; water also may be soaked by capillary forces through voids in

3500-402: Is a medium used to connect or "wire" components to one another in a circuit . It takes the form of a laminated sandwich structure of conductive and insulating layers: each of the conductive layers is designed with a pattern of traces, planes and other features (similar to wires on a flat surface) etched from one or more sheet layers of copper laminated onto or between sheet layers of

3640-477: Is about 73, compared to about 4 for common circuit board materials. Absorbed moisture can also vaporize on heating, as during soldering , and cause cracking and delamination , the same effect responsible for "popcorning" damage on wet packaging of electronic parts. Careful baking of the substrates may be required to dry them prior to soldering. Often encountered materials: Less-often encountered materials: Copper thickness of PCBs can be specified directly or as

3780-468: Is an important consideration especially with ball grid array (BGA) and naked die technologies, and glass fiber offers the best dimensional stability. FR-4 is by far the most common material used today. The board stock with unetched copper on it is called "copper-clad laminate". With decreasing size of board features and increasing frequencies, small nonhomogeneities like uneven distribution of fiberglass or other filler, thickness variations, and bubbles in

3920-451: Is coated onto the PCB, then exposed to light projected in the pattern of the artwork. The resist material protects the copper from dissolution into the etching solution. The etched board is then cleaned. A PCB design can be mass-reproduced in a way similar to the way photographs can be mass-duplicated from film negatives using a photographic printer . FR-4 glass epoxy is the most common insulating substrate. Another substrate material

4060-443: Is compressed by a coding system which combines the benefits of traditional run-length coding, with the advantages of pixel definitions. There is physical space for up to 7.5 Mbytes of memory, although the addressing can access up to 16 Mbytes. For this application a field of data is stored in less than 8 kbytes of memory space, as opposed to over 400 kbytes for a full field store. To the right of these cards are five unused slots and to

4200-418: Is equivalent in quality to an 8-layer through-hole PCB, so HDI technology can reduce costs. HDI PCBs are often made using build-up film such as ajinomoto build-up film, which is also used in the production of flip chip packages. Some PCBs have optical waveguides, similar to optical fibers built on the PCB. A basic PCB consists of a flat sheet of insulating material and a layer of copper foil , laminated to

4340-632: Is estimated to reach $ 79 billion by 2024. Before the development of printed circuit boards, electrical and electronic circuits were wired point-to-point on a chassis. Typically, the chassis was a sheet metal frame or pan, sometimes with a wooden bottom. Components were attached to the chassis, usually by insulators when the connecting point on the chassis was metal, and then their leads were connected directly or with jumper wires by soldering , or sometimes using crimp connectors, wire connector lugs on screw terminals, or other methods. Circuits were large, bulky, heavy, and relatively fragile (even discounting

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4480-406: Is included within the system for checking output levels and matrix accuracy. The system also includes a large power supplier, based on a commercial unit, and a BBC designed clock generator which is common with other digital equipments. The main store of the system is known as the 'sequence' memory. This holds the data for the map of the world for each of the 600 fields that are displayed. This data

4620-471: Is the most common thickness; 2 oz (70 μm) and 0.5 oz (17.5 μm) thickness is often an option. Less common are 12 and 105 μm, 9 μm is sometimes available on some substrates. Flexible substrates typically have thinner metalization. Metal-core boards for high power devices commonly use thicker copper; 35 μm is usual but also 140 and 400 μm can be encountered. In the US, copper foil thickness

4760-506: The Nine O'Clock News had been moved to the later time of 22:00 and Panorama moved from Monday night prime time slot to a later slot on Sunday nights. The moving of Panorama attracted criticism that BBC One was sidelining serious programming in favour of more populist output. Heggessey publicly defended the decision, despite it not being hers, claiming that Panorama 's ratings would have "dwindled" in its previous slot. Heggessey and

4900-413: The BBC1 ident at the time . No clock accompanied the look, due to the various time zones used around the world, with serious or news programming being introduced by the globe. Presentational style mirrored by that used on BBC1 and 2 at the time, and featured a static globe, positioned with Britain, Europe and Africa in view, with BBC logo beneath located in the top left corner of the screen. The logo

5040-482: The NICAM digital stereo sound format began on BBC1 in late 1987, to coincide with the sale of the first consumer NICAM-enabled equipment, a year after BBC2, and were gradually phased in across BBC TV output, although it took until 31 August 1991 for the service to begin officially on both channels. During this time, both commercial analogue broadcasters, ITV and Channel 4 had officially begun stereo transmissions using

5180-657: The Quantel Paintbox . This was used for a 2:1 size reduction which incorporated the anti-aliasing algorithms. The data was then transferred back to the VAX for encoding into the Designs Department data compression format. The two sets of fixed data, the gold shell for the foreground and the blue disc with caption for the background, were 'drawn' on the Paintbox. This data is properly anti-aliased at source and

5320-449: The glass transition temperature the resin in the composite softens and significantly increases thermal expansion; exceeding T g then exerts mechanical overload on the board components - e.g. the joints and the vias. Below T g the thermal expansion of the resin roughly matches copper and glass, above it gets significantly higher. As the reinforcement and copper confine the board along the plane, virtually all volume expansion projects to

5460-399: The signal propagation speed , frequency dependence introduces phase distortion in wideband applications; as flat a dielectric constant vs frequency characteristics as is achievable is important here. The impedance of transmission lines decreases with frequency, therefore faster edges of signals reflect more than slower ones. Dielectric breakdown voltage determines the maximum voltage gradient

5600-442: The "Balloon" idents (and the traditional "Globe" idents the channel had used in a variety of forms since 1963). They were replaced by a new style of on-air identity for the channel, the "Rhythm & Movement" idents . The new idents attracted criticism for going against the traditions of the channel and pandering to " political correctness ", as they featured activities performed by people of various ethnicities. The abandonment of

5740-440: The '1' and the globe was altered into a variety of guises. One was made for each year the ident was in existence, None were used by BBC Scotland, instead using their own idents. The COW was generated by a black box containing several circuit boards . Each board carried one layer of the animation - the BBC1 logo, blue background etc., with switches to input various captions when needed. Their output had an aspect ratio of 5:4 and

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5880-529: The 'fixed' memory. The memory structure is similar to that used for the recently introduced digital Test Card F generator, but each card can hold more data, and can be a part of a larger data-base. The EPROMs used are 27128 16 kbyte devices, although the memory card can take 27256 and even 27512 devices as, and when, they become available. When fully populated with 27128s each card holds 0.5 Mbytes. The EPROMs in question contain 20 000 pixels of map data pre-rendered as frames of animation. Each card has on its side

6020-493: The 18:20 slot, but this was dismissed. The Miss Great Britain contest was dropped, being described as verging on the too offensive after the January 1985 contest, with World's Strongest Man and International Superstar also being cancelled. BBC1 was relaunched on 18 February 1985 with a new look , new programming including Wogan and EastEnders , and a revised schedule to help streamline and maintain viewers throughout

6160-514: The BBC announced plans to launch a one-hour time shift of the channel, named BBC One +1. The channel would have replaced BBC Three in 2016. However, on 30 June 2015, the BBC Trust rejected the plans for a BBC One +1 channel as they stated that it would be at the expense of commercial rivals. BBC One HD , a simulcast of BBC One in 1080i high definition (HD), launched on 3 November 2010 at 19:00 with The One Show . The channel simulcasts

6300-535: The BBC's Controller of Drama Commissioning, Jane Tranter , took advantage of the weekday 21:00 slot opening up by moving the news to commission new popular drama output, such as the successful Waking the Dead (2000–2011) and Spooks (2002–2011). Celebrity dancing show Strictly Come Dancing (2004–present) was also a popular success on Saturday nights, although another Saturday night entertainment series, Fame Academy , faced accusations of being too derivative of

6440-429: The BBC's television output be out-sourced to independent production companies. By 2004, many popular BBC One shows were made for the channel by independents, but the in-house production departments continued to contribute heavily to the schedule. In March 1991, as part of the £63 million programme package for spring and summer line up on BBC1, it was announced an extra £20 million was to be spent on rejuvenating

6580-505: The BBC, and set about overhauling BBC1, which had been slated with poor home grown shows, its heavy reliance on US imports, with Dallas and The Thorn Birds being BBC1's highest rated programmes and ratings being over 20% behind ITV. Cotton recruited Michael Grade to become Controller of BBC1 from 1 September 1984 the first time the corporation had recruited someone outside of the BBC, replacing Alan Hart, who had been criticised for his lack of knowledge in general entertainment, as he

6720-621: The BBC-developed NICAM system. Widescreen programming was introduced on digital platforms in 1998. For the first 50 years of its existence, with the exception of films and programmes purchased from the United States and elsewhere, almost all the channel's output were produced by the BBC's in-house production departments. This changed following the passing of the Broadcasting Act 1990 , which required that 25% of

6860-409: The BBC1 legend. The globe was generated when needed by the computer programme located in a metal box. This box had switches on the front that could turn the BBC1 caption, regional caption and subtitles caption on and off, as these elements were added later. These generators were delivered to all 11 regions and installed before Christmas 1984. Originally it was planned to be launched on 1 January 1985, but

7000-678: The Delivering Quality First proposals submitted by the BBC in October 2011 and approved by the BBC Trust in May 2012, all children's programming on BBC One and Two would be moved permanently to the CBBC and CBeebies channels following the digital switchover. It was found that the majority of child viewers watched the programmes on these channels already and that only 7% of these children watched CBBC programmes on BBC One and Two only, it

7140-558: The PCB surface, instead of wire leads to pass through holes. Components became much smaller and component placement on both sides of the board became more common than with through-hole mounting, allowing much smaller PCB assemblies with much higher circuit densities. Surface mounting lends itself well to a high degree of automation, reducing labor costs and greatly increasing production rates compared with through-hole circuit boards. Components can be supplied mounted on carrier tapes. Surface mount components can be about one-quarter to one-tenth of

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7280-521: The Queen which was shown to journalists during a press conference. It apparently showed the Queen storming out of a session with American photographer Annie Leibovitz over a disagreement about what she should wear, but the BBC subsequently admitted that the scenes used in the trailer had been edited out of their correct order, meaning that a false impression was given. Fincham admitted the error, but rejected calls that he should resign from his position as

7420-473: The Saturday night line up to increase variety. Following the public disapproval of filling its schedule with 25% of repeats during the summer months of 1993, BBC1 agreed to broadcast an extra 110 hours worth of original programming over the same period during the summer in 1994, which included giving EastEnders an additional episode per week. Efficiency savings of £25 million were found and redeployed to

7560-465: The afternoon. Jasmine Bligh , one of the original announcers, made the first announcement, saying, "Good afternoon everybody. How are you? Do you remember me, Jasmine Bligh?". Twenty minutes later, BBC Television again aired the Mickey Mouse cartoon that they had broadcast in 1939. The BBC held a statutory monopoly on television broadcasting in the United Kingdom until Associated-Rediffusion ,

7700-453: The back of the board in opposite directions to improve the part's mechanical strength), soldering the leads, and trimming off the ends. Leads may be soldered either manually or by a wave soldering machine. Surface-mount technology emerged in the 1960s, gained momentum in the early 1980s, and became widely used by the mid-1990s. Components were mechanically redesigned to have small metal tabs or end caps that could be soldered directly onto

7840-437: The board and soldered onto copper traces on the other side. Boards may be single-sided, with an unplated component side, or more compact double-sided boards, with components soldered on both sides. Horizontal installation of through-hole parts with two axial leads (such as resistors, capacitors, and diodes) is done by bending the leads 90 degrees in the same direction, inserting the part in the board (often bending leads located on

7980-425: The bottom of the screen. The font was also changed to Optima, with text remaining in the same position. All this would now be located over the image rather than separate from it. Promotions were not uniform, but were based on a seasonal scheme before being replaced. The promotions usually didn't contain any channel branding but would occasionally feature parts of the BBC1 legend in the design. During Christmas times,

8120-519: The breakable glass envelopes of the vacuum tubes that were often included in the circuits), and production was labor-intensive, so the products were expensive. Development of the methods used in modern printed circuit boards started early in the 20th century. In 1903, a German inventor, Albert Hanson, described flat foil conductors laminated to an insulating board, in multiple layers. Thomas Edison experimented with chemical methods of plating conductors onto linen paper in 1904. Arthur Berry in 1913 patented

8260-458: The caveat that the new show would not launch until at least November 1981, whereupon new licence fee income could finance the necessary extension of broadcasting hours. On 17 January 1983, one year after originally planned, the first edition of Breakfast Time was shown on BBC1, becoming the first UK wide breakfast television service and continued to lead in the ratings until 1984. In 1984, Bill Cotton become managing director of Television at

8400-524: The ceramic substrate. In 1948, the US released the invention for commercial use. Printed circuits did not become commonplace in consumer electronics until the mid-1950s, after the Auto-Sembly process was developed by the United States Army. At around the same time in the UK work along similar lines was carried out by Geoffrey Dummer , then at the RRDE . Motorola was an early leader in bringing

8540-479: The channel after the BBC's contract to show the programme ended on 8 February 2008, and moved to Channel 5 on 11 February 2008. The Weakest Link was moved from BBC Two to fill the gap, with the afternoon CBBC slot moving 20 minutes earlier. There was further controversy in July 2007 when Fincham was accused of misleading BBC One viewers. The incident involved a clip from forthcoming documentary A Year with

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8680-492: The channel reused the COW symbol. Technically, the globe itself remained the same with changes made only to presentational style and the caption below the globe and the whole look being brought into line with corporate branding at the time. The ident itself was modified with the caption beneath showing a BBC corporate logo , with the slanted legend 'World Service Television' beneath, in the same style as used for regional variations of

8820-440: The channels drama and comedy output during peak times, to keep the channel in a healthy state once the new Channel 3 licences were awarded. In December 1991 Wogan was to be cancelled, due to falling ratings against a number of ITV shows, in which Wogan only managed six million viewers compared to double that for This Is Your Life , The Krypton Factor and The $ 64,000 Question . Additionally an extra £40 million

8960-757: The circuit, but manufacturing and assembly can be automated. Electronic design automation software is available to do much of the work of layout. Mass-producing circuits with PCBs is cheaper and faster than with other wiring methods, as components are mounted and wired in one operation. Large numbers of PCBs can be fabricated at the same time, and the layout has to be done only once. PCBs can also be made manually in small quantities, with reduced benefits. PCBs can be single-sided (one copper layer), double-sided (two copper layers on both sides of one substrate layer), or multi-layer (outer and inner layers of copper, alternating with layers of substrate). Multi-layer PCBs allow for much higher component density, because circuit traces on

9100-539: The circuit. Some of these dielectrics are polytetrafluoroethylene (Teflon), FR-4, FR-1, CEM-1 or CEM-3. Well known pre-preg materials used in the PCB industry are FR-2 (phenolic cotton paper), FR-3 (cotton paper and epoxy), FR-4 (woven glass and epoxy), FR-5 (woven glass and epoxy), FR-6 (matte glass and polyester), G-10 (woven glass and epoxy), CEM-1 (cotton paper and epoxy), CEM-2 (cotton paper and epoxy), CEM-3 (non-woven glass and epoxy), CEM-4 (woven glass and epoxy), CEM-5 (woven glass and polyester). Thermal expansion

9240-413: The clock, however it is not believed that any other English regions received their own variations. The network BBC One clock did not have a centre dot; this was never rectified throughout the run of the clock due to an oversight, however the dot was present on regional variations. The new look also marked a change in programme slide design. These new slides featured the BBC1 legend upright and sideways in

9380-568: The commissioning of several successful BBC One programmes including Robin Hood (2006–2009), Jane Eyre (2006) and How Do You Solve a Problem like Maria? , which was followed by similar shows Any Dream Will Do and I'd Do Anything because of its success. His first full year in charge of the channel saw a year-on-year growth in the audience share, with a rise from 22.2% in August 2005 to 23.6% in August 2006. Fincham also directly initiated

9520-431: The components, test points , or identifying text. Originally, silkscreen printing was used for this purpose, but today other, finer quality printing methods are usually used. Normally the legend does not affect the function of a PCBA. A printed circuit board can have multiple layers of copper which almost always are arranged in pairs. The number of layers and the interconnection designed between them (vias, PTHs) provide

9660-523: The corporation strengthened its drama output costing £30 million, with eight new series, including Howards' Way , All Creatures Great and Small , Hold the Back Page , and Bluebill , along with the return of Bergerac and Big Deal . The increase in the drama department was achieved by switching the money away from the administrative service over a three-year period, after BBC1 was criticised for failing to match ITV's output in drama. EastEnders

9800-453: The course of the evening. Grade started to gear most programmes to either on the hour or half past the hour, while Panorama and Omnibus were both moved after the Nine O'Clock News . Grade was also determined to end the dated and inept BBC1 scheduling which was hampering the channel and holding back good programmes. Grade said "When I took over BBC1, I discovered there were wonderful things, it

9940-426: The creation of both The One Show (2006–present), an early evening, current-affairs and lifestyle magazine programme, which now runs all but two weeks of the year, and Davina (2006), a prime time chat show , the latter hosted by Davina McCall , who presented Big Brother . However, Davina was a critical and ratings disaster, which Fincham subsequently admitted was personally his fault, although he defended

10080-459: The current spelling of BBC One in 1997. The channel's annual budget for 2012–2013 was £1.14 billion. It is funded by the television licence fee together with the BBC's other domestic television stations and shows uninterrupted programming without commercial advertising. The television channel had the highest reach share of any broadcaster in the United Kingdom as at 2019, ahead of its traditional rival for ratings leadership ITV . In 2013,

10220-533: The customising for each region affects only the data on two cards in the system. In fact, since only the caption is different for each, only 16 EPROMs are specialised. The controller also decodes the sequence data from its highly compressed format into a usable 13.5 MHz data stream, and distributes timing information to the rest of the system. Timing control is useful, since it can eliminate the need for external synchronising. This equipment's output can be varied from over 6 μs early to over 3 μs late relative to

10360-471: The desired final thickness and dielectric characteristics. Available standard laminate thickness are listed in ANSI/IPC-D-275. The cloth or fiber material used, resin material, and the cloth to resin ratio determine the laminate's type designation (FR-4, CEM -1, G-10 , etc.) and therefore the characteristics of the laminate produced. Important characteristics are the level to which the laminate

10500-498: The development of printed components and conductors on a common insulating substrate. Rubinstein was honored in 1984 by his alma mater, the University of Wisconsin-Madison , for his innovations in the technology of printed electronic circuits and the fabrication of capacitors. This invention also represents a step in the development of integrated circuit technology, as not only wiring but also passive components were fabricated on

10640-403: The dielectric constant). The reinforcement type defines two major classes of materials: woven and non-woven. Woven reinforcements are cheaper, but the high dielectric constant of glass may not be favorable for many higher-frequency applications. The spatially nonhomogeneous structure also introduces local variations in electrical parameters, due to different resin/glass ratio at different areas of

10780-400: The end of analogue broadcasting. Between 1973 and 1977, BBC1 achieved an average audience share of 45% under Bryan Cowgill . This was the channel's most successful period in terms of audience share. On 30 December 1980, the BBC announced plans to introduce a new breakfast television service to compete with TV-am . They stated that the new show would be broadcast before TV-am but included

10920-405: The finished multilayer board) are plated-through, before the layers are laminated together. Only the outer layers need be coated; the inner copper layers are protected by the adjacent substrate layers. "Through hole" components are mounted by their wire leads passing through the board and soldered to traces on the other side. "Surface mount" components are attached by their leads to copper traces on

11060-478: The first Independent Television (ITV) station, began to broadcast on 22 September 1955. The competition quickly forced the channel to change its identity and priorities, following a large reduction in its audience, as noted in the 1962 Pilkington Report on the future of broadcasting. Simultaneously, the Pilkington Report decided to award an additional television station to the BBC on the basis that ITV

11200-446: The first time and had a live in-vision presenter, similar to rival ITV's Children's ITV block which had been running since January 1983. Previously the BBC had broadcast children's programming using BBC1's team of regular duty announcers. The launch presenter for this block, and thus the first Children's BBC presenter of the current format, was Phillip Schofield . On 23 May 1986, long-running lunchtime magazine show Pebble Mill at One

11340-531: The first time since the rival channel had launched in 1955, although much of this was down to the success of the channel's daytime television line-up, which had its own Controller: Jane Lush . When Heggessey arrived at the channel in November 2000, she inherited two controversial schedule changes which had been implemented the previous month, at the behest of Director-General of the BBC Greg Dyke ;

11480-483: The first variation. A Scottish variation launched on 14 January 2013, followed by a Welsh variation on 29 January 2013. On 16 July 2013, the BBC indicated that it also wants to launch regional variants of BBC One HD across England; however, this would require the approval of the BBC Trust, with a proposal due to be presented within six months. On 18 November 2013, the Northern Irish regional variant of BBC One HD

11620-447: The inner layers would otherwise take up surface space between components. The rise in popularity of multilayer PCBs with more than two, and especially with more than four, copper planes was concurrent with the adoption of surface mount technology . However, multilayer PCBs make repair, analysis, and field modification of circuits much more difficult and usually impractical. The world market for bare PCBs exceeded $ 60.2 billion in 2014 and

11760-427: The internal layers is used as ground plane or power plane, to achieve better signal integrity, higher signaling frequencies, lower EMI, and better power supply decoupling. In multi-layer boards, the layers of material are laminated together in an alternating sandwich: copper, substrate, copper, substrate, copper, etc.; each plane of copper is etched, and any internal vias (that will not extend to both outer surfaces of

11900-506: The launch of Channel 4 . The COW was originally planned to launch on 1 January 1985, but Michael Grade , then controller of BBC1 , delayed the launch to coincide with a larger schedule change that accompanied the launch of the soap opera EastEnders , and updated and renewed weather graphics. This launch was hoped to reinvent BBC1 following ratings slide and ever increasing competition from their commercial rivals at ITV . The globe itself launched at 7 pm on 18 February, introducing one of

12040-709: The launch of the HD channels, this also means the closure of the SD channels. SD channels are shut on satellite 24 hours after the launch of the HD channel, and are moved up to the Channel 1/Channel 101 slot on the EPG. Viewers with older standard definition set-top boxes will no longer be able to receive BBC One. All BBC satellite channels in standard definition have closed on 8 January 2024. Circuit boards A printed circuit board ( PCB ), also called printed wiring board ( PWB ),

12180-455: The launch was deferred to coincide with radical changes to the BBC1 schedule. The look also featured an altered clock face to that used previously. This clock was once again electronic, but was changed to a black background, blue counters and gold hands to match the ident. The updated BBC1 legend also featured below the clock. The nations of Scotland , Wales and Northern Ireland , as well as BBC Midlands , did receive their own variations of

12320-552: The lowest common denominator to increase viewership. Reliance on docusoaps and the dropping of the vilified Noel's House Party were chastened by the hoax guests on The Vanessa Show . Alan Yentob said "The spring package is to remind people of what the BBC is here for, range and ambition you won't find anywhere else at peak time". The changes helped the channel distinguish itself from (as one BBC executive said) "its down-market rival and would not compete for viewers on ITV's terms." Lorraine Heggessey became Controller of BBC One,

12460-498: The material can be subjected to before suffering a breakdown (conduction, or arcing, through the dielectric). Tracking resistance determines how the material resists high voltage electrical discharges creeping over the board surface. Loss tangent determines how much of the electromagnetic energy from the signals in the conductors is absorbed in the board material. This factor is important for high frequencies. Low-loss materials are more expensive. Choosing unnecessarily low-loss material

12600-495: The materials and along the reinforcement. Epoxies of the FR-4 materials are not too susceptible, with absorption of only 0.15%. Teflon has very low absorption of 0.01%. Polyimides and cyanate esters, on the other side, suffer from high water absorption. Absorbed water can lead to significant degradation of key parameters; it impairs tracking resistance, breakdown voltage, and dielectric parameters. Relative dielectric constant of water

12740-465: The mixed syncs input reference. Digital multipliers are used to key the map onto the foreground and background data streams. These are full 8 x 8 bit devices, and correct scaling is incorporated to ensure unity gain where necessary. The two keys are processed to prevent any excess amplitude after combining. The two data streams are added digitally, before being blanked. Normally digital blanking needs to be shaped to conform to PAL system I, but since all

12880-525: The national version of BBC One in High Definition, with HD versions of programmes including Doctor Who , Holby City , The One Show , Strictly Come Dancing and The Apprentice . EastEnders was also made available in HD from Christmas Day 2010. All programmes still made in standard definition were upscaled on the channel, with the intention that by 2012 the vast majority of the channel's output would be in high definition. On 30 May 2012,

13020-498: The need for additional discrete components. High density interconnects (HDI) PCBs have tracks or vias with a width or diameter of under 152 micrometers. Laminates are manufactured by curing layers of cloth or paper with thermoset resin under pressure and heat to form an integral final piece of uniform thickness. They can be up to 4 by 8 feet (1.2 by 2.4 m) in width and length. Varying cloth weaves (threads per inch or cm), cloth thickness, and resin percentage are used to achieve

13160-463: The new flagship programmes: Wogan , a chat show hosted by Terry Wogan and featuring a variety of guests. The old Noddy globe had been used throughout the day until the 7 pm launch. The Computer Originated World itself is a semi-transparent blue globe with golden continents and gold "BBC1" legend located below the globe in a font similar to that used in the early days of the BBC . The globe revolved at

13300-503: The new look was unveiled whilst the channel was still on the air rather than waiting for the following morning to launch it. The globe was created by the BBC graphics and BBC computer departments and work began in 1983. The need to replace the Noddy globes came about as the globes were the only mechanically produced idents around on national television, as more and more television companies started to use computer graphics, made popular by

13440-464: The new productions. The savings were seen as a vindication for Producer Choice, the controversial internal market introduced in April 1993. By March 1999, the channel admitted defeat in its ratings war with ITV, with its spring line up emphasising more on serious factual and educational programmes, and drama. This change in strategy came about after continuing complaints that the channel was appealing to

13580-490: The one hand it is inevitable. But it is dismissive of children. There is a certain amount of overlooking of the fact that children's programmes do get a wider audience than people are aware of ... I have frequently had letters from older people who have enjoyed my programmes as much as children do. A lot of the reason older people like to watch children's programming is because it is life-enhancing." Head of BBC Children's, Joe Godwin said: "Our young viewers are our priority and

13720-419: The original BBC Arabic Television . BBC One The channel was launched on 2 November 1936 under the name BBC Television Service , which was the world's first regular television service with a high level of image resolution . It was renamed BBC TV in 1960 and used this name until the launch of the second BBC channel, BBC2 , in 1964. The main channel then became known as BBC1. The channel adopted

13860-454: The output of commercial rivals, and during Heggessey's era the channel frequently came under attack for being too populist and not providing enough serious programming. Immediately after her arrival, Heggessey ordered a review of the "Balloon" idents the channel had been using for its between-programme idents since 1997. In her opinion, the balloon was "slow and distant" and so, on 29 March 2002, after much speculation, she decided to abandon

14000-472: The overall effect two full frame-stores are used. One is the foreground store which holds the highlighted gold shell, and the other is the background store for the shaded blue disc and the captions. These stores hold only a single frame, and there is no restriction on their content. They are full colour and can display any picture produced by the Quantel Paintbox. These stores are generally known as

14140-471: The point-to-point chassis construction method remained in common use in industry (such as TV and hi-fi sets) into at least the late 1960s. Printed circuit boards were introduced to reduce the size, weight, and cost of parts of the circuitry. In 1960, a small consumer radio receiver might be built with all its circuitry on one circuit board, but a TV set would probably contain one or more circuit boards. Originally, every electronic component had wire leads , and

14280-583: The printed circuit as part of a radio set while working in the UK around 1936. In 1941 a multi-layer printed circuit was used in German magnetic influence naval mines . Around 1943 the United States began to use the technology on a large scale to make proximity fuzes for use in World War II. Such fuzes required an electronic circuit that could withstand being fired from a gun, and could be produced in quantity. The Centralab Division of Globe Union submitted

14420-425: The process into consumer electronics, announcing in August 1952 the adoption of "plated circuits" in home radios after six years of research and a $ 1M investment. Motorola soon began using its trademarked term for the process, PLAcir, in its consumer radio advertisements. Hallicrafters released its first "foto-etch" printed circuit product, a clock-radio, on November 1, 1952. Even as circuit boards became available,

14560-403: The protruding wires are cut off and discarded. From the 1980s onward, small surface mount parts have been used increasingly instead of through-hole components; this has led to smaller boards for a given functionality and lower production costs, but with some additional difficulty in servicing faulty boards. In the 1990s the use of multilayer surface boards became more frequent. As a result, size

14700-441: The resin matrix, and the associated local variations in the dielectric constant, are gaining importance. The circuit-board substrates are usually dielectric composite materials. The composites contain a matrix (usually an epoxy resin ) and a reinforcement (usually a woven, sometimes nonwoven, glass fibers, sometimes even paper), and in some cases a filler is added to the resin (e.g. ceramics; titanate ceramics can be used to increase

14840-426: The right of those is a card with a red handle, which is the processor card. The player can be made to display variants of images by changing some switch settings on the processor card. The starting point for the sequence data was a purchased data-base of a Mercator's projection map of the world. This was edited by Computer Graphics to remove all political boundaries, and transferred from their DEC VAX-11 computer into

14980-522: The rights to broadcast the show in the UK for two years. The Voice UK achieved good ratings for the BBC but ratings dropped towards the end of the first series and the second series. In 2013, The Voice UK was rescheduled to avoid a clash, and as a result, ratings have improved. In November 2015, it was announced that The Voice UK would be moving to ITV from 2017, especially because of the ITV plc ownership of franchise owner, Talpa Media . On 8 October 2013,

15120-478: The same side of the board. A board may use both methods for mounting components. PCBs with only through-hole mounted components are now uncommon. Surface mounting is used for transistors , diodes , IC chips , resistors , and capacitors. Through-hole mounting may be used for some large components such as electrolytic capacitors and connectors. The first PCBs used through-hole technology , mounting electronic components by lead inserted through holes on one side of

15260-545: The satellite and terrestrial resolution was increased to full HD . BBC One HD at launch did not offer regional variations, and therefore the channel could not broadcast during regional programming slots, most noticeably the local news programmes. The BBC Trust admitted that this was due to technical and financial constraints, but the BBC announced on 6 June 2011 that the national variations of BBC One Northern Ireland, BBC One Scotland and BBC One Wales, would become available from 2012. On 24 October 2012, Northern Ireland received

15400-559: The series as "a joyful, exuberant reinvention and a fine legacy from Ms Heggessey." Heggessey did later concede in a 2005 interview with The Independent newspaper that arts programming had suffered a cutback under her control of BBC One. However, she did respond to this omission following criticism from the Board of Governors of the BBC by commissioning programmes such as the arts documentary series Imagine... (2003–present) and A Picture of Britain (2005). On 14 February 2005 it

15540-412: The series in September 2003, after Heggessey had spent two years persuading the BBC's commercial arm, BBC Worldwide , to abandon their attempts to make a feature film version of the programme and allow it to instead return it to BBC One. The new version of Doctor Who (2005–present) debuted on 26 March 2005 and became a critical and popular hit, with Paul Hoggart of The Times newspaper describing

15680-470: The signals are generated internally, correct shaping is naturally included within the data. (In any case the start and end of all lines are black.) A new, triple-video, analogue-to- digital converter has been designed to provide the YUV outputs and an analogue matrix used for two sets of RGB outputs. Both these units employ close tolerance components to minimise drift, and hence regular alignment. A test waveform

15820-408: The simplest boards to produce is the two-layer board. It has copper on both sides that are referred to as external layers; multi layer boards sandwich additional internal layers of copper and insulation. After two-layer PCBs, the next step up is the four-layer. The four layer board adds significantly more routing options in the internal layers as compared to the two layer board, and often some portion of

15960-414: The size and weight of through-hole components, and passive components much cheaper. However, prices of semiconductor surface mount devices (SMDs) are determined more by the chip itself than the package, with little price advantage over larger packages, and some wire-ended components, such as 1N4148 small-signal switch diodes, are actually significantly cheaper than SMD equivalents. Each trace consists of

16100-484: The strategy of experimenting with the BBC One schedule. This he continued in January 2007, when he moved the current affairs series Panorama from its Sunday night slot back to the prime time Monday evening slot from which it had been removed in 2000, most likely in response to a demand from the Board of Governors of the BBC for the channel to show more current affairs programming in prime time. Fincham's judgement

16240-422: The substrate. Chemical etching divides the copper into separate conducting lines called tracks or circuit traces , pads for connections, vias to pass connections between layers of copper, and features such as solid conductive areas for electromagnetic shielding or other purposes. The tracks function as wires fixed in place, and are insulated from each other by air and the board substrate material. The surface of

16380-402: The term "printed circuit board" most commonly means "printed circuit assembly" (with components). The IPC preferred term for an assembled board is circuit card assembly ( CCA ), and for an assembled backplane it is backplane assembly . "Card" is another widely used informal term for a "printed circuit assembly". For example, expansion card . A PCB may be printed with a legend identifying

16520-419: The thickness and stresses the plated-through holes. Repeated soldering or other exposition to higher temperatures can cause failure of the plating, especially with thicker boards; thick boards therefore require a matrix with a high T g . The materials used determine the substrate's dielectric constant . This constant is also dependent on frequency, usually decreasing with frequency. As this constant determines

16660-467: The time Michael Grade and Jonathan Powell were blamed for the decision (Grade was the target of death threats ) but it was later revealed that the decision was taken due to the series running out of creative inspiration, making it impossible to find anyone (at the time) who knew what to do with the series. On 9 September 1985, the long-standing children's programming block was overhauled and rebranded as Children's BBC , which gave it dedicated idents for

16800-442: The vast majority of children in the UK already tune in to CBeebies and CBBC to find their favourite BBC children's programmes. Far from being a 'cynical' move, we're just following where our audience has already gone." As part of the review in 2012 other changes were brought in, including: In 2012, the BBC out-bid ITV for the rights to air a British version of Dutch TV talent show The Voice . The BBC paid £22 million for

16940-511: The weave pattern. Nonwoven reinforcements, or materials with low or no reinforcement, are more expensive but more suitable for some RF/analog applications. The substrates are characterized by several key parameters, chiefly thermomechanical ( glass transition temperature , tensile strength , shear strength , thermal expansion ), electrical ( dielectric constant , loss tangent , dielectric breakdown voltage , leakage current , tracking resistance ...), and others (e.g. moisture absorption ). At

17080-433: The weeks leading up to 15 November 1969, BBC1 unofficially transmitted the occasional programme in its new colour system in order to test it. At midnight on 15 November, simultaneously with ITV and two years after BBC2 had done so, BBC1 officially began 625-line PAL colour programming on UHF with a broadcast of a concert by Petula Clark . Colour transmissions could be received in monochrome via monochrome 625-line sets until

17220-440: The weight of copper per area (in ounce per square foot) which is easier to measure. One ounce per square foot is 1.344 mils or 34 micrometers thickness. Heavy copper is a layer exceeding three ounces of copper per ft , or approximately 0.0042 inches (4.2 mils, 105 μm) thick. Heavy copper layers are used for high current or to help dissipate heat. On the common FR-4 substrates, 1 oz copper per ft (35 μm)

17360-501: The word "The" and moved into the BBC logo. Each new campaign incorporating the theme retained the same animated sequence. In May 2007, Fincham decided to drop Neighbours , an Australian soap opera, from BBC One after 21 years on the channel, when its producers, FremantleMedia significantly raised the price they wanted the BBC to pay for it in a bidding war. Fincham commented that it was 'a big loss', but that BBC One would not pay 'the best part of £300 million'. Neighbours left

17500-510: The £18 million salary that the BBC paid Jonathan Ross in 2006, although Ross's BBC One work—primarily consisting of Friday Night with Jonathan Ross —formed only part of his overall BBC commitment. The channel was named Channel of the Year at the 2007 Broadcast Awards. Following its rebrand in March 2002, BBC One launched The One to Watch campaign, during which animated blocks created

17640-543: Was cropped for transmission to 4:3 . The digital standard used is that specified by the EBU for a digital parallel interface. While the device has only analogue outputs, to suit present installations, the EBU specification defines the required sampling rates and levels for luminance and chrominance . A further advantage is that the Quantel Paintbox handles data in a form quite close, but not identical, to this format. To produce

17780-438: Was again called into question, this time by The Telegraph , for his decision to spend £1.2 million replacing the channel's 'Rhythm and Movement' idents , which had been introduced by his predecessor Lorraine Heggessey several years earlier, with the 'Circle' idents , a set of eight ten-second films, some of which were shot abroad in locations such as Mexico and Croatia. Fincham later found himself having to publicly defend

17920-468: Was also transferred to their VAX-11. Further processing ensures that no degradation occurs. Both the fixed and sequence data was transferred from Computer Graphics to Design Department on magnetic tape , using the internal post. This proved to be an extremely efficient method of data interchange, far exceeding the earlier methods of paper tape and floppy disks . Upon the launch of BBC World Service Television on 11 March 1991 to replace BBC TV Europe ,

18060-530: Was announced that Lorraine Heggessey was to leave the BBC to take up the post of Chief Executive at production company Talkback Thames . She left on 15 April. Five months after her departure, BBC One was named "Channel of the Year" at the Edinburgh Television Festival , primarily on the strength of Heggessey's commissions such as Strictly Come Dancing and Doctor Who . Joining the channel as Controller in 2005, Peter Fincham oversaw

18200-433: Was assigned to the U.S. Army. With the development of board lamination and etching techniques, this concept evolved into the standard printed circuit board fabrication process in use today. Soldering could be done automatically by passing the board over a ripple, or wave, of molten solder in a wave-soldering machine. However, the wires and holes are inefficient since drilling holes is expensive and consumes drill bits and

18340-430: Was broadcast for the last time after being on air for 14 years. On 27 October 1986, BBC1 launched its daytime television schedules. In a statement, BBC Daytime head Roger Laughton said: It was the natural extension of the corporation's commitment to public service broadcasting, since half the population had access to television during the day mainly the retired, unemployed and housewives. Stereo audio transmissions, using

18480-402: Was dropped in favour of a look consisting entirely of real and simulated flags on the screen, with a single large BBC logo in centre screen. This was to emphasise the role that news played on the channel, and to associate itself more closely as a news channel, rather than BBC1. This is primarily evident, as the look was reused for that purpose upon the channel's split into BBC World , as well as

18620-426: Was further minimized and both flexible and rigid PCBs were incorporated in different devices. In 1995 PCB manufacturers began using microvia technology to produce High-Density Interconnect (HDI) PCBs. Recent advances in 3D printing have meant that there are several new techniques in PCB creation. 3D printed electronics (PEs) can be utilized to print items layer by layer and subsequently the item can be printed with

18760-510: Was head of BBC Sport prior to 1981. The first major overhaul was to axe the unpopular Sixty Minutes current affairs programme: this was a replacement for the news and magazine show Nationwide . Its replacement was the BBC Six O'Clock News , a straight news programme in a bid to shore up its failing early evening slot. It was believed the BBC were planning to cut short the evening news and move more light entertainment programming in from

18900-601: Was in comparison lacking in serious programming. BBC Television became BBC1 when BBC2 launched on 20 April 1964, transmitting an incompatible 625-line image on UHF . The only way to receive all channels was to use a complex "dual-standard" 405- and 625-line receiver with both a VHF and a UHF aerial (405-line-only sets became obsolete in 1985 when VHF transmissions ended). BBC1 moved to purpose-built facilities at Television Centre on 20 September 1969. Television News continued to use Alexandra Palace as its base and by early 1968 had even converted one of its studios to colour. In

19040-491: Was just a case of where to put them." Wogan had been scheduled for a 10 pm slot, but Grade moved it to a 7 pm slot as he believed the show had potential. From February to August 1985, a high number of American mini-series were broadcast while filming took place of a number of new home grown programmes, including 'Allo 'Allo! , In Sickness and in Health , and Open All Hours . Further improvement came about when

19180-418: Was made clear "Children's programmes are absolutely fundamental to the BBC and that is why we have protected investment in them in the light of cuts elsewhere." Children's programming on BBC One ended on 21 December 2012. The move was criticised by Teletubbies co-creator Anne Wood , who described the changes as "ghettoising children's programmes" and believe it was merely a cost-cutting measure. Wood said "On

19320-438: Was moved to a 19:30 slot, where it managed to soar to 20 million, helping the BBC1 audience share increase to nearly 50% for the first time since 1982. On 27 February 1985, Doctor Who was placed on an 18-month hiatus. The BBC originally planned to axe the series as they wished to spend its budgets on new programming for the channel, but was forced to back down from public pressure and Doctor Who returned in September 1986. At

19460-495: Was present throughout the presentation. Static captions also featured this globe symbol in the top left corner, located in a sidebar of generic lines, with programme title overlaid the image at the bottom of the screen. The station was also unusual, in the fact that it had a static, opaque permanent digital on-screen graphic (DOG) of the BBC logo in the top right corner of the screen. The look appears to have been dropped on 26 January 1995. The look on BBC World Service Television

19600-621: Was swapped with the SD channel on Sky's EPG for HD subscribers. This was followed by the Welsh and Scottish variants on 10 December. On 24 March 2014, BBC One Scotland, Wales and Northern Ireland HD launched on Freesat, Sky and Virgin Media outside the regions they were originally seen in. On 31 March 2016, BBC One HD in England moved from channel 141 on the Sky electronic programme guide to channel 115,

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