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122-567: Adam Walton (born 31 May 1971) is a British radio disc jockey who has presented shows on BBC Radio Wales since 1993. He is also a member of Mold -based, indie band The Immediate , and a resident DJ at Telford's Warehouse in Chester. Adam has also written a book On Making Music . Walton was born in Davenham , Cheshire . His family moved to Nannerch , Wales where he was brought up. He studied English at Liverpool University gaining

244-517: A crypt -like vault . Those on the first floor are entered behind a continuous walkway, often with a sloping shelf between the walkway and the railings overlooking the street. Much of the architecture of central Chester looks medieval and some of it is, but by far the greater part of it, including most of the black-and-white buildings, is Victorian , a result of what Pevsner termed the " black-and-white revival " pioneered by architects John Douglas and T.M. Lockwood . The most prominent buildings in

366-471: A directional antenna transmits radio waves in a beam in a particular direction, or receives waves from only one direction. Radio waves travel at the speed of light in vacuum and at slightly lower velocity in air. The other types of electromagnetic waves besides radio waves, infrared , visible light , ultraviolet , X-rays and gamma rays , can also carry information and be used for communication. The wide use of radio waves for telecommunication

488-418: A microphone , a video signal representing moving images from a video camera , or a digital signal consisting of a sequence of bits representing binary data from a computer. The modulation signal is applied to a radio transmitter . In the transmitter, an electronic oscillator generates an alternating current oscillating at a radio frequency , called the carrier wave because it serves to generate

610-497: A radar screen . Doppler radar can measure a moving object's velocity, by measuring the change in frequency of the return radio waves due to the Doppler effect . Radar sets mainly use high frequencies in the microwave bands, because these frequencies create strong reflections from objects the size of vehicles and can be focused into narrow beams with compact antennas. Parabolic (dish) antennas are widely used. In most radars

732-648: A rain shadow effect caused by the Welsh Mountains. Over 1mm of rain is reported on 135.5 days. The Chester Urban Area is an urban area surrounding the city of Chester. The urban area includes the town of Saltney in Flintshire , North Wales and the outlying suburbs of Bache , Blacon , Boughton , Curzon Park , Great Boughton , Handbridge , Huntington , Hoole , Kingsway, Lache , Moston , Newton , Newtown , Queens Park , Upton , Vicars Cross , and Westminster Park . Areas just outside

854-474: A " push to talk " button on their radio which switches off the receiver and switches on the transmitter. Or the radio link may be full duplex , a bidirectional link using two radio channels so both people can talk at the same time, as in a cell phone. One way, unidirectional radio transmission is called simplex . This is radio communication between a spacecraft and an Earth-based ground station, or another spacecraft. Communication with spacecraft involves

976-635: A CD EP Stay Young in 1995. Walton began presenting a show on BBC Radio Wales called Revolution in October 1994. It was broadcast on week nights from the BBC studios in Mold and several artistes appeared in session on the show including Frank Black , Julian Cope , Ride , Throwing Muses , Catatonia and Melys . The show ran with this format until 1998. The show was relaunched as The Musical Mystery Tour and schedule changes moved its one hour format, 4 nights

1098-550: A Grade II listed building. The county police headquarters has since moved again, in 1967, to Nuns Road before leaving the city in 2003 for Clemonds Hey, Winsford . According to the 2011 census, Chester had a large White British proportion of around 110,000 or 90.9% of the population. 1.0% described themselves as Irish. 3.6% as Other White . 2.2% described themselves as Asian. 1.3% described themselves as Mixed Race . 0.6% described themselves as Black or Black British and 0.3% are classed as other. Cheshire West and Chester also has

1220-410: A Saturday morning show called Science Cafe on BBC Radio Wales, featuring and interviewing people from the world of science, such as British astronaut Tim Peake . He was also behind a tech show on the station called Mousemat (2013). From 2017 until 2021, Adam Walton occasionally stood in for Janice Long on her BBC Radio Wales weekday evening show, as well as being the show's producer, and presented

1342-627: A Service Regulation specifying that "Radiotelegrams shall show in the preamble that the service is 'Radio ' ". The switch to radio in place of wireless took place slowly and unevenly in the English-speaking world. Lee de Forest helped popularize the new word in the United States—in early 1907, he founded the DeForest Radio Telephone Company, and his letter in the 22 June 1907 Electrical World about

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1464-445: A degree and formed a band in 1990 to 'avoid working.' In June 1991 Adam began presenting a series of seven 30 minute radio shows called Burst on the now defunct station, BBC Radio Clwyd. Wanting to focus on his band, Walton didn't do any further radio work for 3 years. His band (originally called Daisychain ) released a cassette EP called Maelstrom . They changed their name to Metroland before settling on The Immediate , who released

1586-421: A given bandwidth than analog modulation , by using data compression algorithms, which reduce redundancy in the data to be sent, and more efficient modulation. Other reasons for the transition is that digital modulation has greater noise immunity than analog, digital signal processing chips have more power and flexibility than analog circuits, and a wide variety of types of information can be transmitted using

1708-548: A government license, such as the general radiotelephone operator license in the US, obtained by taking a test demonstrating adequate technical and legal knowledge of safe radio operation. Exceptions to the above rules allow the unlicensed operation by the public of low power short-range transmitters in consumer products such as cell phones, cordless phones , wireless devices , walkie-talkies , citizens band radios , wireless microphones , garage door openers , and baby monitors . In

1830-594: A guide for bands and artistes on how to make music and how get it out into the public domain. As Adam said, "It saddens me that music-makers in 2014 are making the exact same mistakes I was making in 1994, and this is my attempt to offer advice that will help them to avoid those pitfalls, and also to inspire them." Having split up in 1996, The Immediate reformed in 2016 and began playing a few gigs in Chester and North Wales . They released two albums Manbouy (16 June 2017) then More Sheep Than Humans . Adam has represented

1952-696: A kilometer away in 1895, and the first transatlantic signal on 12 December 1901. The first commercial radio broadcast was transmitted on 2 November 1920, when the live returns of the Harding-Cox presidential election were broadcast by Westinghouse Electric and Manufacturing Company in Pittsburgh, under the call sign KDKA . The emission of radio waves is regulated by law, coordinated by the International Telecommunication Union (ITU), which allocates frequency bands in

2074-493: A large economic cost, but it can also be life-threatening (for example, in the case of interference with emergency communications or air traffic control ). To prevent interference between different users, the emission of radio waves is strictly regulated by national laws, coordinated by an international body, the International Telecommunication Union (ITU), which allocates bands in the radio spectrum for different uses. Radio transmitters must be licensed by governments, under

2196-525: A large number of Christians at 76.4%. 14% have no religion, and 8.2% are not stated. 0.7% are Muslim. 0.1% are Sikhs. 0.1% are Jewish. 0.2% are Buddhists. The population was forecast to grow by 5% from 2005 to 2021. The resident population for Chester District in the 2001 Census was 118,200. This represents 17.5% of the Cheshire County total (1.8% of the North West population). The city

2318-595: A metal conductor called an antenna . As they travel farther from the transmitting antenna, radio waves spread out so their signal strength ( intensity in watts per square meter) decreases (see Inverse-square law ), so radio transmissions can only be received within a limited range of the transmitter, the distance depending on the transmitter power, the antenna radiation pattern , receiver sensitivity, background noise level, and presence of obstructions between transmitter and receiver . An omnidirectional antenna transmits or receives radio waves in all directions, while

2440-403: A mobile navigation instrument receives radio signals from multiple navigational radio beacons whose position is known, and by precisely measuring the arrival time of the radio waves the receiver can calculate its position on Earth. In wireless radio remote control devices like drones , garage door openers , and keyless entry systems , radio signals transmitted from a controller device control

2562-427: A more limited information-carrying capacity and so work best with audio signals (speech and music), and the sound quality can be degraded by radio noise from natural and artificial sources. The shortwave bands have a greater potential range but are more subject to interference by distant stations and varying atmospheric conditions that affect reception. In the very high frequency band, greater than 30 megahertz,

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2684-470: A primitive spark-gap transmitter . Experiments by Hertz and physicists Jagadish Chandra Bose , Oliver Lodge , Lord Rayleigh , and Augusto Righi , among others, showed that radio waves like light demonstrated reflection, refraction , diffraction , polarization , standing waves , and traveled at the same speed as light, confirming that both light and radio waves were electromagnetic waves, differing only in frequency. In 1895, Guglielmo Marconi developed

2806-420: A public audience. Analog audio is the earliest form of radio broadcast. AM broadcasting began around 1920. FM broadcasting was introduced in the late 1930s with improved fidelity . A broadcast radio receiver is called a radio . Most radios can receive both AM and FM. Television broadcasting is the transmission of moving images by radio, which consist of sequences of still images, which are displayed on

2928-459: A radio signal is usually concentrated in narrow frequency bands called sidebands ( SB ) just above and below the carrier frequency. The width in hertz of the frequency range that the radio signal occupies, the highest frequency minus the lowest frequency, is called its bandwidth ( BW ). For any given signal-to-noise ratio , an amount of bandwidth can carry the same amount of information ( data rate in bits per second) regardless of where in

3050-647: A reconstructed Roman street. One of the blocks in the forecourt of the Castle houses the Cheshire Military Museum. The major public park in Chester is Grosvenor Park . On the south side of the River Dee, in Handbridge , is Edgar's Field, another public park, which contains Minerva's Shrine , a Roman shrine to the goddess Minerva . A war memorial to those who died in the world wars is in

3172-673: A reference to the radiotelegraph and radiotelegraphy . The use of radio as a standalone word dates back to at least 30 December 1904, when instructions issued by the British Post Office for transmitting telegrams specified that "The word 'Radio'... is sent in the Service Instructions." This practice was universally adopted, and the word "radio" introduced internationally, by the 1906 Berlin Radiotelegraphic Convention, which included

3294-446: A screen on a television receiver (a "television" or TV) along with a synchronized audio (sound) channel. Television ( video ) signals occupy a wider bandwidth than broadcast radio ( audio ) signals. Analog television , the original television technology, required 6 MHz, so the television frequency bands are divided into 6 MHz channels, now called "RF channels". The current television standard, introduced beginning in 2006,

3416-441: A smaller bandwidth than the old analog channels, saving scarce radio spectrum space. Therefore, each of the 6 MHz analog RF channels now carries up to 7 DTV channels – these are called "virtual channels". Digital television receivers have different behavior in the presence of poor reception or noise than analog television, called the " digital cliff " effect. Unlike analog television, in which increasingly poor reception causes

3538-616: A spur leading to the Water Tower , and Thimbleby's Tower . On Eastgate is Eastgate Clock , which is said to be the most photographed clock face in England after those that share the tower with Big Ben . The Rows are unique in Britain. They consist of buildings with shops or dwellings on the lowest two storeys. The shops or dwellings on the ground floor are often lower than the street and are entered by steps, which sometimes lead to

3660-477: A summer music festival and a literature festival . There is a Tourist Information Centre at the town hall. The Cheshire Police Constabulary was historically based in the city from its foundation in 1857. Originally on Seller Street, its headquarters moved to Egerton Street (both since redeveloped), and then from 1870 to 113 Foregate Street, where Parker's Buildings now stand. In 1883, the police headquarters moved to 142 Foregate Street, Chester , now preserved as

3782-416: A television (video) signal has a greater data rate than an audio signal . The radio spectrum , the total range of radio frequencies that can be used for communication in a given area, is a limited resource. Each radio transmission occupies a portion of the total bandwidth available. Radio bandwidth is regarded as an economic good which has a monetary cost and is in increasing demand. In some parts of

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3904-412: A temperature of 25.1 °C (77.2 °F) or higher. Given the correctly aligned breezy conditions, a föhn effect will operate, meaning local temperatures are somewhat higher than the surrounding area. The absolute minimum temperature recorded was −18.2 °C (−0.8 °F) during January 1982. Annually, an average of 42.2 air frosts should be recorded. Annual rainfall is barely over 700mm due to

4026-487: A three-hour tribute to Long following her death in December 2021. In 1998 Adam launched Whipcord Records and released 7" singles by Out and Big Leaves . He resurrected the label in 2016 as an outlet for his own material. He is also a resident DJ at Telford's Warehouse , Chester , the venue hosts regular bands, which Adam occasionally gets involved with promoting them; notably Coldplay before they were famous. In

4148-652: A transmitter to control the actions of a device at a remote location. Remote control systems may also include telemetry channels in the other direction, used to transmit real-time information on the state of the device back to the control station. Uncrewed spacecraft are an example of remote-controlled machines, controlled by commands transmitted by satellite ground stations . Most handheld remote controls used to control consumer electronics products like televisions or DVD players actually operate by infrared light rather than radio waves, so are not examples of radio remote control. A security concern with remote control systems

4270-435: A variety of license classes depending on use, and are restricted to certain frequencies and power levels. In some classes, such as radio and television broadcasting stations, the transmitter is given a unique identifier consisting of a string of letters and numbers called a call sign , which must be used in all transmissions. In order to adjust, maintain, or internally repair radiotelephone transmitters, individuals must hold

4392-462: A week to a Sunday night. In 2007, Adam decided to dedicate the show entirely to new Welsh music , a format he still employs today. On 7 January 2011 the show moved to Saturday nights (10pm – 1am) With a dedication to Welsh artists, the show hosted weekly pre-recorded sessions for countless underground acts, and Adam was/is often lauded as a champion of such music. Budget constraints have prevented regular sessions since 2012 and despite cuts and changes

4514-580: Is Cair Legion (" Fort " or " City of the Legion"); this later developed into Caerlleon and then the modern Welsh Caer . (The town's importance is noted by its taking the simpler form in each case, while Isca Augusta in Monmouthshire , another important legionary base, was known first as Caerleon on the Usk , and now as Caerleon ). King Arthur is said to have fought his ninth battle at

4636-413: Is amplified in the transmitter and applied to a transmitting antenna which radiates the energy as radio waves. The radio waves carry the information to the receiver location. At the receiver, the radio wave induces a tiny oscillating voltage in the receiving antenna which is a weaker replica of the current in the transmitting antenna. This voltage is applied to the radio receiver , which amplifies

4758-703: Is spoofing , in which an unauthorized person transmits an imitation of the control signal to take control of the device. Examples of radio remote control: Radio jamming is the deliberate radiation of radio signals designed to interfere with the reception of other radio signals. Jamming devices are called "signal suppressors" or "interference generators" or just jammers. During wartime, militaries use jamming to interfere with enemies' tactical radio communication. Since radio waves can pass beyond national borders, some totalitarian countries which practice censorship use jamming to prevent their citizens from listening to broadcasts from radio stations in other countries. Jamming

4880-588: Is a cathedral city and the county town of Cheshire , England, on the River Dee , close to the England-Wales border . With a built-up area population of 92,760 in 2021, it is the most populous settlement of Cheshire West and Chester (which had a population of 357,150 in 2021). It is also the historic county town of Cheshire and the second-largest settlement in Cheshire after Warrington . Chester

5002-464: Is a heritage centre , St Mary-on-the-Hill is an educational centre, and Holy Trinity now acts as the Guildhall. Other notable buildings include the preserved shot tower , the highest structure in Chester, and St Thomas of Canterbury Church . Roman remains can still be found in the city, particularly in the basements of some of the buildings and in the lower parts of the northern section of

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5124-445: Is a digital format called high-definition television (HDTV), which transmits pictures at higher resolution, typically 1080 pixels high by 1920 pixels wide, at a rate of 25 or 30 frames per second. Digital television (DTV) transmission systems, which replaced older analog television in a transition beginning in 2006, use image compression and high-efficiency digital modulation such as OFDM and 8VSB to transmit HDTV video within

5246-661: Is also a Scheduled Monument . The Minerva Shrine in the Roman quarry is the only rock-cut Roman shrine still in situ in Britain. The fortress was garrisoned by the legion until at least the late 4th century. Although the army had abandoned the fortress by 410 when the Romans retreated from Britannia , the Romano-British civilian settlement continued (probably with some Roman veterans staying behind with their wives and children) and its occupants probably continued to use

5368-433: Is an audio transceiver , a receiver and transmitter in the same device, used for bidirectional person-to-person voice communication with other users with similar radios. An older term for this mode of communication is radiotelephony . The radio link may be half-duplex , as in a walkie-talkie , using a single radio channel in which only one radio can transmit at a time, so different users take turns talking, pressing

5490-410: Is called "tuning". The oscillating radio signal from the desired station causes the tuned circuit to resonate , oscillate in sympathy, and it passes the signal on to the rest of the receiver. Radio signals at other frequencies are blocked by the tuned circuit and not passed on. A modulated radio wave, carrying an information signal, occupies a range of frequencies . The information ( modulation ) in

5612-427: Is called an uplink , while a link that transmits data from the spacecraft to the ground is called a downlink. Radar is a radiolocation method used to locate and track aircraft, spacecraft, missiles, ships, vehicles, and also to map weather patterns and terrain. A radar set consists of a transmitter and receiver. The transmitter emits a narrow beam of radio waves which is swept around the surrounding space. When

5734-530: Is home to the University of Chester . Formerly a teacher training college, it gained full university status in 2005 and is the county's main provider of tertiary education. The University of Law also has a campus in nearby Christleton . Cheshire College – South & West is a vocational college with campuses in Handbridge as well as Ellesmere Port and Crewe. The King's School , a private school ,

5856-565: Is in radio clocks and watches, which include an automated receiver that periodically (usually weekly) receives and decodes the time signal and resets the watch's internal quartz clock to the correct time, thus allowing a small watch or desk clock to have the same accuracy as an atomic clock. Government time stations are declining in number because GPS satellites and the Internet Network Time Protocol (NTP) provide equally accurate time standards. A two-way radio

5978-417: Is mainly due to their desirable propagation properties stemming from their longer wavelength. In radio communication systems, information is carried across space using radio waves. At the sending end, the information to be sent is converted by some type of transducer to a time-varying electrical signal called the modulation signal. The modulation signal may be an audio signal representing sound from

6100-698: Is owned by The 7th Duke of Westminster who owns an estate, Eaton Hall , near the village of Eccleston . He also has London properties in Mayfair . Grosvenor is the Duke's family name, which explains such features in the city as the Grosvenor Bridge , the Grosvenor Hotel , and Grosvenor Park. Much of Chester's architecture dates from the Victorian era , many of the buildings being modelled on

6222-524: Is the one-way transmission of information from a transmitter to receivers belonging to a public audience. Since the radio waves become weaker with distance, a broadcasting station can only be received within a limited distance of its transmitter. Systems that broadcast from satellites can generally be received over an entire country or continent. Older terrestrial radio and television are paid for by commercial advertising or governments. In subscription systems like satellite television and satellite radio

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6344-469: Is usually accomplished by a powerful transmitter which generates noise on the same frequency as the target transmitter. US Federal law prohibits the nonmilitary operation or sale of any type of jamming devices, including ones that interfere with GPS, cellular, Wi-Fi and police radars. ELF 3 Hz/100 Mm 30 Hz/10 Mm SLF 30 Hz/10 Mm 300 Hz/1 Mm ULF 300 Hz/1 Mm 3 kHz/100 km Chester Chester

6466-463: The City of Chester is Samantha Dixon ( Labour ), who has held the seat since a by-election in 2022 . Chester was an ancient borough , with its earliest known charters dating from the twelfth century. It was given the right to appoint its own sheriffs in 1506, making it a county corporate , administratively separate from the rest of Cheshire. The borough gained city status in 1541 on the creation of

6588-569: The Diocese of Chester . The borough was reformed to become a municipal borough in 1836 under the Municipal Corporations Act 1835 , which standardised the way many boroughs operated across the country. When elected county councils were created in 1889, Chester was considered large enough to provide its own county-level services. So it was made a county borough , independent from Cheshire County Council . The county borough

6710-684: The Emperor Vespasian founded Chester in AD 79 as a " castrum " or Roman fort with the name Deva Victrix . It was established in the land of the Celtic Cornovii , according to ancient cartographer Ptolemy , as a fortress during the Roman expansion northward, and was named Deva either after the goddess of the Dee, or directly from the British name for the river. The 'victrix' part of

6832-598: The Jacobean half-timbered style and designed by John Douglas , who was employed by the Duke as his principal architect. He had a trademark of twisted chimney stacks, many of which can be seen on the buildings in the city centre. Douglas designed, amongst other buildings, the Grosvenor Hotel and the City Baths . In 1911, Douglas' protégé and city architect James Strong designed the then-active fire station on

6954-545: The Old Dee Bridge , dating from the 13th century, the Grosvenor Bridge of 1832, and Queen's Park suspension bridge (for pedestrians). To the southwest of the city, the River Dee curves towards the north. The area between the river and the city walls here is known as the Roodee and contains Chester Racecourse , which holds a series of horse races and other events. The first recorded race meet in England at Roodee Fields

7076-504: The ionosphere without refraction , and at microwave frequencies the high-gain antennas needed to focus the radio energy into a narrow beam pointed at the receiver are small and take up a minimum of space in a satellite. Portions of the UHF , L , C , S , k u and k a band are allocated for space communication. A radio link that transmits data from the Earth's surface to a spacecraft

7198-509: The radio spectrum for various uses. The word radio is derived from the Latin word radius , meaning "spoke of a wheel, beam of light, ray". It was first applied to communications in 1881 when, at the suggestion of French scientist Ernest Mercadier  [ fr ] , Alexander Graham Bell adopted radiophone (meaning "radiated sound") as an alternate name for his photophone optical transmission system. Following Hertz's discovery of

7320-400: The radio spectrum into 12 bands, each beginning at a wavelength which is a power of ten (10 ) metres, with corresponding frequency of 3 times a power of ten, and each covering a decade of frequency or wavelength. Each of these bands has a traditional name: It can be seen that the bandwidth , the range of frequencies, contained in each band is not equal but increases exponentially as

7442-531: The "city of the legions" ( Caerlleon ) and later St Augustine came to the city to try to unite the church, and held his synod with the Welsh Bishops. In 616, Æthelfrith of Northumbria defeated a Welsh army at the brutal and decisive Battle of Chester and probably established the Anglo-Saxon position in the area from then on. The Northumbrian Anglo-Saxons used an Old English equivalent of

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7564-531: The 1920s with the introduction of broadcasting. Electromagnetic waves were predicted by James Clerk Maxwell in his 1873 theory of electromagnetism , now called Maxwell's equations , who proposed that a coupled oscillating electric field and magnetic field could travel through space as a wave, and proposed that light consisted of electromagnetic waves of short wavelength . On 11 November 1886, German physicist Heinrich Hertz , attempting to confirm Maxwell's theory, first observed radio waves he generated using

7686-466: The 1950s and early 1960s, producing, for instance, the suburb of Blacon . In 1964, a bypass was built through and around the city centre to combat traffic congestion. These new developments caused local concern as the physicality and, therefore, the feel of the city was being dramatically altered. In 1968, a report by Donald Insall, in collaboration with authorities and government, recommended that historic buildings be preserved in Chester. Consequently,

7808-599: The British name, Legacæstir , which was current until the 11th century, when, in a further parallel with Welsh usage, the first element fell out of use and the simple name Chester emerged. In 689, King Æthelred of Mercia founded the Minster Church of West Mercia on what is considered to be an early Christian site: it is known as the Minster of St John the Baptist, Chester (now St John's Church) which later became

7930-474: The Earth's atmosphere has less of an effect on the range of signals, and line-of-sight propagation becomes the principal mode. These higher frequencies permit the great bandwidth required for television broadcasting. Since natural and artificial noise sources are less present at these frequencies, high-quality audio transmission is possible, using frequency modulation . Radio broadcasting means transmission of audio (sound) to radio receivers belonging to

8052-481: The Lord Mayor. Chester's city status is now formally held by the area of the charter trustees, comprising the 15 wards of Cheshire West and Chester which correspond to the area of the pre-2009 Chester City Council. The official city therefore includes rural areas beyond Chester's built-up area, and had a total population of 138,875 at the 2021 census, compared to 92,760 for the built-up area. Chester lies at

8174-596: The US, these fall under Part 15 of the Federal Communications Commission (FCC) regulations. Many of these devices use the ISM bands , a series of frequency bands throughout the radio spectrum reserved for unlicensed use. Although they can be operated without a license, like all radio equipment these devices generally must be type-approved before the sale. Below are some of the most important uses of radio, organized by function. Broadcasting

8296-401: The actions of a remote device. The existence of radio waves was first proven by German physicist Heinrich Hertz on 11 November 1886. In the mid-1890s, building on techniques physicists were using to study electromagnetic waves, Italian physicist Guglielmo Marconi developed the first apparatus for long-distance radio communication, sending a wireless Morse Code message to a recipient over

8418-405: The air simultaneously without interfering with each other because each transmitter's radio waves oscillate at a different rate, in other words, each transmitter has a different frequency , measured in hertz (Hz), kilohertz (kHz), megahertz (MHz) or gigahertz (GHz). The receiving antenna typically picks up the radio signals of many transmitters. The receiver uses tuned circuits to select

8540-619: The area where boulder clay was absent. The eastern and northern parts of Chester consisted of heathland and forest. The western side towards the Dee Estuary was marsh and wetland habitats. Chester has an oceanic climate ( Köppen : Cfb ), typical of the British Isles but more susceptible to cold than the extreme south. Despite its proximity to the Irish Sea , the temperature regime is similar to areas further inland, owing to

8662-451: The band in session on local radio. Walton also uses the band's name for his solo projects. Radio In radio communication , used in radio and television broadcasting , cell phones, two-way radios , wireless networking , and satellite communication , among numerous other uses, radio waves are used to carry information across space from a transmitter to a receiver, by modulating the radio signal (impressing an information signal on

8784-527: The basement of 39 Bridge Street, which is open to the public. Of the original medieval city, the most important surviving structure is Chester Castle , particularly the Agricola Tower. Much of the rest of the castle has been replaced by the neoclassical county court and its entrance, the Propyleum. To the south of the city runs the River Dee, with its 11th-century weir . The river is crossed by

8906-414: The beam strikes a target object, radio waves are reflected back to the receiver. The direction of the beam reveals the object's location. Since radio waves travel at a constant speed close to the speed of light , by measuring the brief time delay between the outgoing pulse and the received "echo", the range to the target can be calculated. The targets are often displayed graphically on a map display called

9028-471: The buildings were used in new and different ways instead of being demolished. The City Conservation Area was designated in 1969. Over the next twenty years, the emphasis was placed on saving historic buildings, such as The Falcon Inn , Dutch Houses , and Kings Buildings. On 13 January 2002, Chester was granted the first UK Fairtrade City status by the Fairtrade Foundation . In 2011 this

9150-543: The circuit is in the southwest section in front of County Hall . A footpath runs along the top of the walls, crossing roads by bridges over Eastgate, Northgate , St Martin's Gate, Watergate , Bridgegate , Newgate , and the Wolf Gate, and passing a series of structures, namely Phoenix Tower (or King Charles' Tower), Morgan's Mount , the Goblin Tower (or Pemberton's Parlour ), and Bonewaldesthorne's Tower with

9272-579: The city against the Danes . Chester was one of the last cities in England to fall to the Normans , and William the Conqueror ordered the construction of a castle to dominate the town and the nearby Welsh border. Chester was granted city status in 1541. The city walls of Chester are some of the best-preserved in the country and have Grade I listed status. Apart from a 100-metre (330 ft) section,

9394-531: The city centre are the town hall and the cathedral . The town hall was opened in 1869. It is in Gothic Revival style and has a tower and a short spire. The cathedral was formerly the church of St Werburgh's Abbey . Its architecture dates back to the Norman era, with additions made most centuries since. A series of major restorations took place in the 19th century, and in 1975, a separate bell tower

9516-480: The city include: Christleton , Eccleston , Guilden Sutton , Littleton , Mickle Trafford , Mollington , Saughall and Waverton . The more unusual landmarks in the city are the city walls , the Rows and the black-and-white architecture. The walls encircle the bounds of the medieval city and constitute the most complete city walls in Britain, the full circuit measuring nearly 2 miles (3 km). The only break in

9638-696: The city walls , and in St Werburgh's Roman Catholic church in Grosvenor Park Road. The Anglo-Saxons extended and strengthened the walls of Chester to protect the city against the Danes, who occupied it for a short time until Alfred seized all the cattle and laid waste on the surrounding land to drive them out. It was Alfred's daughter Æthelflæd , Lady of the Mercians, that built the new Anglo-Saxon burh . A new Church dedicated to St Peter alone

9760-476: The city walls. The most important Roman feature is the amphitheatre just outside the walls, which underwent archaeological investigation in the early 21st century. Roman artefacts are on display in the Roman Gardens which run parallel to the city walls from Newgate to the River Dee, where there's also a reconstructed hypocaust system . An original hypocaust system discovered in the 1720s can be seen in

9882-668: The continuous waves which were needed for audio modulation , so radio was used for person-to-person commercial, diplomatic and military text messaging. Starting around 1908 industrial countries built worldwide networks of powerful transoceanic transmitters to exchange telegram traffic between continents and communicate with their colonies and naval fleets. During World War I the development of continuous wave radio transmitters, rectifying electrolytic, and crystal radio receiver detectors enabled amplitude modulation (AM) radiotelephony to be achieved by Reginald Fessenden and others, allowing audio to be transmitted. On 2 November 1920,

10004-466: The customer pays a monthly fee. In these systems, the radio signal is encrypted and can only be decrypted by the receiver, which is controlled by the company and can be deactivated if the customer does not pay. Broadcasting uses several parts of the radio spectrum, depending on the type of signals transmitted and the desired target audience. Longwave and medium wave signals can give reliable coverage of areas several hundred kilometers across, but have

10126-570: The existence of radio waves in 1886, the term Hertzian waves was initially used for this radiation. The first practical radio communication systems, developed by Marconi in 1894–1895, transmitted telegraph signals by radio waves, so radio communication was first called wireless telegraphy . Up until about 1910 the term wireless telegraphy also included a variety of other experimental systems for transmitting telegraph signals without wires, including electrostatic induction , electromagnetic induction and aquatic and earth conduction , so there

10248-637: The first cathedral. Much later, the body of Æthelred's niece, St Werburgh, was removed from Hanbury in Staffordshire in the 9th century and, to save it from desecration by Danish marauders was reburied in the Church of SS Peter & Paul – later to become the Abbey Church (the present cathedral). Her name is still remembered in St Werburgh's Street, which passes alongside the cathedral, and near

10370-413: The first commercial radio broadcast was transmitted by Westinghouse Electric and Manufacturing Company in Pittsburgh, under the call sign KDKA featuring live coverage of the Harding-Cox presidential election . Radio waves are radiated by electric charges undergoing acceleration . They are generated artificially by time-varying electric currents , consisting of electrons flowing back and forth in

10492-592: The first radio communication system, using a spark-gap transmitter to send Morse code over long distances. By December 1901, he had transmitted across the Atlantic Ocean. Marconi and Karl Ferdinand Braun shared the 1909 Nobel Prize in Physics "for their contributions to the development of wireless telegraphy". During radio's first two decades, called the radiotelegraphy era, the primitive radio transmitters could only transmit pulses of radio waves, not

10614-557: The fortress and its defences as protection from raiders from the Irish Sea . After the Roman troops withdrew, the Romano-British established several petty kingdoms. Chester is thought to have become part of Powys . Deverdoeu was a Welsh name for Chester as late as the 12th century (cf Dyfrdwy , Welsh for the river Dee). Another, attested in the 9th-century History of the Britons traditionally attributed to Nennius ,

10736-618: The frequency increases; each band contains ten times the bandwidth of the preceding band. The term "tremendously low frequency" (TLF) has been used for wavelengths from 1–3 Hz (300,000–100,000 km), though the term has not been defined by the ITU. The airwaves are a resource shared by many users. Two radio transmitters in the same area that attempt to transmit on the same frequency will interfere with each other, causing garbled reception, so neither transmission may be received clearly. Interference with radio transmissions can not only have

10858-501: The great Minster Church of St John the Baptist by six (the monk Henry Bradshaw records he was rowed by eight kings) tributary kings called reguli . In 1071, King William the Conqueror made Hugh d'Avranches , who built Chester Castle , the first Earl of Chester (second creation) . From the 14th to the 18th century, the city's prominent position in North West England meant it was commonly known as Westchester. This name

10980-413: The late 1990s and into the 2000s, Adam contributed a weekly column to the newspaper Daily Post (North Wales) called Ear Buzz that covered local music topics of the day. The column was later relaunched from a more 'personal life' point of view before fizzling out. He also hosted his own website covering reviews, show playlists and information (c2010). 2014 saw the launch of Adam's book On Making Music ,

11102-402: The longest transmission distances of any radio links, up to billions of kilometers for interplanetary spacecraft . In order to receive the weak signals from distant spacecraft, satellite ground stations use large parabolic "dish" antennas up to 25 metres (82 ft) in diameter and extremely sensitive receivers. High frequencies in the microwave band are used, since microwaves pass through

11224-587: The monasteries , and ruins of the former east end remain outside the church. Much of the interior is in Norman style and this is considered to be the best example of 11th–12th-century church architecture in Cheshire. At the intersection of the former Roman roads is Chester Cross , to the north of which is the small church of St Peter's , which is in use as an ecumenical centre. Other churches are now redundant and have other uses: St Michael's in Bridge Street

11346-554: The name was taken from the title of the Legio XX Valeria Victrix which was based at Deva. Central Chester's four main roads, Eastgate, Northgate, Watergate and Bridgegate, follow routes laid out at this time. A civilian settlement grew around the military base, which probably originated from trade with the fortress. The fortress was 20% larger than other fortresses in the Roman province of Britannia built around

11468-472: The need for legal restrictions warned that "Radio chaos will certainly be the result until such stringent regulation is enforced." The United States Navy would also play a role. Although its translation of the 1906 Berlin Convention used the terms wireless telegraph and wireless telegram , by 1912 it began to promote the use of radio instead. The term started to become preferred by the general public in

11590-505: The picture quality to gradually degrade, in digital television picture quality is not affected by poor reception until, at a certain point, the receiver stops working and the screen goes black. Government standard frequency and time signal services operate time radio stations which continuously broadcast extremely accurate time signals produced by atomic clocks , as a reference to synchronize other clocks. Examples are BPC , DCF77 , JJY , MSF , RTZ , TDF , WWV , and YVTO . One use

11712-451: The radio frequency spectrum it is located, so bandwidth is a measure of information-carrying capacity . The bandwidth required by a radio transmission depends on the data rate of the information (modulation signal) being sent, and the spectral efficiency of the modulation method used; how much data it can transmit in each kilohertz of bandwidth. Different types of information signals carried by radio have different data rates. For example,

11834-409: The radio signal desired out of all the signals picked up by the antenna and reject the others. A tuned circuit (also called resonant circuit or tank circuit) acts like a resonator , similar to a tuning fork . It has a natural resonant frequency at which it oscillates. The resonant frequency of the receiver's tuned circuit is adjusted by the user to the frequency of the desired radio station; this

11956-451: The radio spectrum, the right to use a frequency band or even a single radio channel is bought and sold for millions of dollars. So there is an incentive to employ technology to minimize the bandwidth used by radio services. A slow transition from analog to digital radio transmission technologies began in the late 1990s. Part of the reason for this is that digital modulation can often transmit more information (a greater data rate) in

12078-415: The radio wave by varying some aspect of the wave) in the transmitter. In radar, used to locate and track objects like aircraft, ships, spacecraft and missiles, a beam of radio waves emitted by a radar transmitter reflects off the target object, and the reflected waves reveal the object's location to a receiver that is typically colocated with the transmitter. In radio navigation systems such as GPS and VOR ,

12200-456: The radio waves that carry the information through the air. The modulation signal is used to modulate the carrier, varying some aspect of the carrier wave, impressing the information in the modulation signal onto the carrier. Different radio systems use different modulation methods: Many other types of modulation are also used. In some types, a carrier wave is not transmitted but just one or both modulation sidebands . The modulated carrier

12322-407: The retail industry, public administration, and financial services are important to the modern economy. Chester signs itself as Chester International Heritage City on road signs on the main roads entering the city. Charles Leigh concluded in 1701 that there was probably a British city called Genuina (or Gunia) before the arrival of the Romans. The Roman Legio II Adiutrix during the reign of

12444-413: The right to appoint a Lord Mayor . Chester City Council was abolished in 2009 when local government across Cheshire was reorganised; Cheshire County Council was also abolished, and the three districts of Chester, Ellesmere Port and Neston and Vale Royal merged to form a unitary authority called Cheshire West and Chester. Charter trustees were established to maintain Chester's city status and appoint

12566-481: The same digital modulation. Because it is a fixed resource which is in demand by an increasing number of users, the radio spectrum has become increasingly congested in recent decades, and the need to use it more effectively is driving many additional radio innovations such as trunked radio systems , spread spectrum (ultra-wideband) transmission, frequency reuse , dynamic spectrum management , frequency pooling, and cognitive radio . The ITU arbitrarily divides

12688-412: The same time at York ( Eboracum ) and Caerleon ( Isca Augusta ); this has led to the suggestion that the fortress, rather than London ( Londinium ), was intended to become the capital of the Roman province of Britannia Superior . The civilian amphitheatre , which was built in the 1st century, could seat between 8,000 and 10,000 people. It is the largest known military amphitheatre in Britain, and

12810-573: The shelter provided by the Pennines to the northeast and the Welsh Mountains to the southwest. The nearest official weather station is at Hawarden Airport , about 4 miles (6.4 km) west of the city centre. The absolute maximum temperature recorded was 37.1 °C (98.8 °F) on 18 July 2022, the highest temperature reported in Wales. In an average year, the warmest day should reach 29.3 °C (84.7 °F), and 12.0 days in total should attain

12932-532: The show continues to promote Welsh music. The show does occasionally organise events or broadcast from events, such as Focus Wales festival in Wrexham and Festival N°6 . In May and June 2005, Adam hosted a show called Walton's Records , a music quiz programme broadcast from various 'venues' in Wales. The format had two teams, captained by Andrea Lewis (of indie band The Darling Buds ) and Hue Williams (of indie band The Pooh Sticks ). Adam Walton also presented

13054-479: The southern end of a 2-mile (3.2 km) Triassic sandstone ridge that rises to a height of 42 m within a natural S-bend in the River Dee (before the course was altered in the 18th century). The bedrock, also known as the Chester Pebble Beds, is noticeable because of the many small stones trapped within its strata. Retreating glacial sheet ice also deposited quantities of sand and marl across

13176-598: The town hall and it contains the names of all Chester servicemen who died in the First World War. There are cruises on the River Dee and the Shropshire Union Canal, as well as guided open-air bus tours. The river cruises and bus tours start from a riverside area known as the Groves, which contains seating and a bandstand . A series of festivals is organised in the city, including mystery plays ,

13298-431: The transmitting antenna also serves as the receiving antenna; this is called a monostatic radar . A radar which uses separate transmitting and receiving antennas is called a bistatic radar . Radiolocation is a generic term covering a variety of techniques that use radio waves to find the location of objects, or for navigation. Radio remote control is the use of electronic control signals sent by radio waves from

13420-483: The two Chester railway stations, Chester General and Chester Northgate Station , meant that Newtown with its cattle market and canal , and Hoole with its railways were responsible for providing the vast majority of workers and in turn, the vast amount of Chester's wealth production throughout the Industrial Revolution. The population was 23,115 by 1841. A considerable amount of land in Chester

13542-611: The walls are almost complete. It has several medieval buildings. However, many of the black-and-white buildings within the city centre are Victorian restorations, originating from the Black-and-white Revival movement. The Industrial Revolution brought railways, canals, and new roads to the city, which saw substantial expansion and development; Chester Town Hall and the Grosvenor Museum are examples of Victorian architecture from this period. Tourism,

13664-510: The weak radio signal so it is stronger, then demodulates it, extracting the original modulation signal from the modulated carrier wave. The modulation signal is converted by a transducer back to a human-usable form: an audio signal is converted to sound waves by a loudspeaker or earphones, a video signal is converted to images by a display , while a digital signal is applied to a computer or microprocessor, which interacts with human users. The radio waves from many transmitters pass through

13786-410: The west side of Northgate Street. Another feature of all buildings belonging to the estate of Westminster is the 'Grey Diamonds' – a weaving pattern of grey bricks in the red brickwork laid out in a diamond formation. Towards the end of World War II , a lack of affordable housing meant many problems for Chester. Large areas of farmland on the city's outskirts were developed as residential areas in

13908-543: Was a need for a more precise term referring exclusively to electromagnetic radiation. The French physicist Édouard Branly , who in 1890 developed the radio wave detecting coherer , called it in French a radio-conducteur . The radio- prefix was later used to form additional descriptive compound and hyphenated words, especially in Europe. For example, in early 1898 the British publication The Practical Engineer included

14030-469: Was abolished in 1974, merging with the former Chester Rural District and Tarvin Rural District which covered the surrounding rural areas to create a new Chester district , which was a district-level authority with Cheshire County Council providing county-level services. Chester's city status was extended to cover the whole of the district created in 1974. In 1992, Chester City Council was given

14152-451: Was extended to the entire borough. There is one main tier of local government covering Chester, at unitary authority level, being Cheshire West and Chester Council . Much of the Chester urban area is an unparished area , but some of the suburbs are included in civil parishes such as Great Boughton and Upton-by-Chester and there is also a small parish in the centre of the city called Chester Castle . The Member of Parliament for

14274-518: Was founded in 79 AD as a " castrum " or Roman fort with the name Deva Victrix during the reign of Emperor Vespasian . One of the main army camps in Roman Britain , Deva later became a major civilian settlement. In 689, King Æthelred of Mercia founded the Minster Church of West Mercia, which later became Chester's first cathedral, and the Angles extended and strengthened the walls to protect

14396-593: Was founded in AD 907 by the Lady Æthelfleda at what was to become the Cross. In 973, the Anglo-Saxon Chronicle records that, two years after his coronation at Bath, King Edgar of England came to Chester where he held his court in a palace in a place now known as Edgar's Field near the old Dee bridge in Handbridge. Taking the helm of a barge, he was rowed the short distance up the River Dee from Edgar's Field to

14518-478: Was on 9 February 1540. The Shropshire Union Canal runs to the north of the city and a branch leads from it to the River Dee. The major museum in Chester is the Grosvenor Museum, which includes a collection of Roman tombstones and an art gallery . Associated with the museum is 20 Castle Street, which has rooms furnished in different historical styles. The Deva Roman Experience has hands-on exhibits and

14640-407: Was opened. The elaborately carved canopies of the choir stalls are considered to be among the finest in the country. Also in the cathedral is the shrine of St Werburgh . The former monastic buildings are north of the cathedral. The oldest church in the city is St John's , which is outside the city walls and was at one time the cathedral church. The church was shortened after the dissolution of

14762-560: Was ordered to surrender Dee Mills: they were to be demolished, and new mills built on city land. Chester played a significant part in the Industrial Revolution , which began in the North West of England in the late 18th century. The city village of Newtown, located northeast of the city and bounded by the Shropshire Union Canal , was at the very heart of this industry. The large Chester Cattle Market and

14884-603: Was used by Celia Fiennes when she visited the city in 1698. and is also used in Moll Flanders . In the English Civil War, Chester sided with the royalist cause of King Charles I but was subdued by the Parliamentarians in 1643. The Mayor of Chester, Charles Walley, was removed from office and replaced by Alderman William Edwards. Another alderman, Francis Gamull , a royalist MP and former Mayor,

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