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About Tpad (www.tpad.com)
Tpad is an international telecommunications company with over 1000 customers in the UK and operating internationally from regional offices in Dubai and Cyprus. With over 20 years experience in the IT Sector, our expertise spans the development, manufacture and installation of business telephony services. Tpad offers solutions to meet all requirements ranging from Managed IP/PBX solutions to complex Contact Centre installations. The Tpad Global Phone Network that has unlimited call handling capacity and our in-house developed software provides an on-net feature rich environment with functionality that includes network based call recording, call reporting, least cost routing, Diallers, Multi-Site solutions and much more.
With over 100 operatives within dedicated Service, Support and Development teams, we pride ourselves on service excellence and after sales care, consistently delivering some of the highest level of support within the industry. Our services are backed by a choice of service levels to dovetail with the skill sets within your organisation.
The Tpad Platform and solutions are able to operate using third party connectivity. However, Tpad is able to offer a range of connectivity solutions by partnering with its sister company, Internexus. With over 12 years in the sector, that includes the provision and management of network solutions for Supanet, the largest independent Internet Service Provider in the UK with over 500 thousand customers using the a range of services from Internet access, line rental and carrier pre-select services, Tpad and Internexus boast experience and knowledge that almost is unparalleled within the industry. Indeed, it was this combined experience that led to the establishment of Tpad's On-Net Voice Platform in 2005, when users were first given the ability to log in and make phone calls over the Internet. Whilst we have come a long way since then, adding the Tpad Platform to our broad range of business IP/PBX equipment powered by industry leading connectivity make our systems a truly one-stop solution.
Tpad's exciting product range is constantly evolving to keep pace both with technological advancements and our commitment offering our customers new and improved features and enhanced capabilities. At the same time we remain true to our core values of providing reliable cutting edge technology with outstanding service delivery. Telecommunications are the foundations on which almost every business in the 21st century is built. Information is power and communication is king. Whatever your requirements Tpad is ideally positioned to deliver a flexible cost-effective solution to satisfy your organisation's telecommunications requirements both for today and in the years to come. Let Tpad be a valuable partner in your business.
The Torre dei Lamberti is a medieval tower in Verona , 84 meters high, which rises from Piazza Erbe , the ancient Roman Forum , in the historic center of the city .
With the exception of the Italian Telecom Tower in the district of San Michele Extra (149 meters) and the Borgo Roma Italy Telecom Tower (102 meters), as structures for telephony, the Torre dei Lamberti holds the record for tallest building in the city of Verona , followed by the white bell tower of the Cathedral , 74.9 meters high.
The origins
The tower was commissioned by the powerful family Lamberti (subsequently banished from Verona and extinct), which began to build it in the eleventh century . At that dates back to the lowest part in tan brick and tufa . In 1140 , in the middle age city, was elected to the civic tower was installed and the first bell , of which nothing is known. In 1272 the statutes stated that, in addition to the bell of ' Arengo (then known as Rengo, he called in the assembly meeting), there was also another, the Marangona (derived from "joiner", which in Veronese dialect means carpenter ), to signal the beginning and end of work activities [1] .
In the fourteenth century
In 1311 a bell was recast and a new addition, called the Consolata. In 1394 it fell to Gianfrancesco da Legnago redo the Rengo , which was then also used to scan the executions of death sentences, alarms, signs of fire, the gathering of the militia and the arrival of a plague. Were present at the bell, with the function of janitors, prison guards (the tower usually housed some prison) and lookouts. They were wrong salaried, but staying free of charge in the tower and were exempt from taxes and military obligations .
Venetian period
In May 1403 a bolt of lightning struck the top of the tower, and only in 1448 work began on the restoration and elevation. that lasted until 1464 . In 1406 the bell made ââa plea for the Venetian governor ( Verona recently came under the rule of the Venetian Republic ), maintained their privileges, from what he confirmed. Have come down to us the names of the players of the time: John Bonifacio from San Giovanni in Valle , Christopher Michael from St Nazaire , Benassù James from Santa Maria in Organo , John Nicholas Hood from San Fermo . In 1452 all'Archicampanista Gasparino from Vicenza was awarded the recasting of the bells Marangona and Rengo. In 1471 it was again rebuilt since the Marangona cracked. In the meantime ( 1464 ) ended the work of raising, bringing the tower to reach the 84 meters, completed in style Gothic , in its present form .
In 1521 the Bonaventurini [5] remade the Rengo, which was recast by them in 1557 , getting one that still rings on the tower, octagonal within the cell. In 1597 the dynasty Levo From recast the Marangona, as noted by the teacher Gardoni "Gothic in shape." We also know the identity of ringers into service in 1606 , Roger Minali and children, replaced in his role, from 1632 to 1797 by the family Tanara, in whose chronicles remember that their elderly was burned by a lightning while stretched out a window of tower; a young man fell from the same of their family without suffering any injury.
In the eighteenth century
The Lamberti Tower photographed from the bell tower of the Cathedral of Verona .
In 1779 the famous founder Joseph Ruffini prepared a bell of hours is (in agreement with the eighth Rengo) and another called Rabbiosa to complete the deal that appeared as:
Rengo : note is flat , fused by Bonaventurini in 1557 ;
Marangona : known Kings , melted by the Da Levo in 1597 ;
Angry : note Fa sharp , cast by Ruffini in 1779 ;
Consolata or Bajona : note the , fused by an unknown in 1311 ;
Doorbell hours : note is flat , fused by Ruffini in 1779 .
These are the bells that rang during the historical event of the Veronese Easters .
Also in 1779 there was a proposal to place a large clock on the tower, but the watchmaker who had to do the work died before they start. It was, in 1798 , Count John Sagramoso in place, at his own expense, the clock, replacing that of the nearby Torre del Gardello , who had stopped working for some time .
From the nineteenth century to the present day
In 1833 the Knight John Cavadini, director of a foundry bells rival that of his brother Francis, recast Marangona Rabbiosa Bajona and getting the current complex consists of:
Rengo : note is flat 2, diameter 184 cm, weight 4215 kg. Fused by Bonaventurini in 1557 . is one of the best bells Renaissance and from the point of view of acoustic and decorative, as well as a rarity for age and size.
Marangona : known Kings 3, diameter 130 cm, weight 1300 kg. Excellent and rich fusion of John Cavadini of 1833 . It is one of the best achievements of the period and, without doubt, the best of this smelter.
Bajona : note Fa 3, diameter 108 cm, weight 750 kg. Merged with the Marangona.
Bell : note is flat 3, diameter 82 cm, weight 330 kg. Fused by Ruffini in 1779 . It was used as a clock signal.
The whole forms a fundamental harmonic arrangement of four bronzes to jump ( Sib 2 - King 3 - Makes 3 - Sib 3), as was the custom in the Baroque era.
At the beginning of the twentieth century the task was entrusted to the bell of St. Anastasia . It was the Rengo, November 4 1918 , 10:30, playing a party to announce the armistice with Austria , the end of the First World War [9] . After the Second World War , the management of the bells of the tower passed to companies bell of Santa Maria in Organo (which in 1994 was absorbed by St. Anastasia )
The tower is now open to the public and you can get in the belfries thanks to the stairs or the elevator, enjoying the panoramic view of the city.
GPO 6-Terminal "Universal" Key. It could be used in place of single- or double-current keys, dependant on the wiring. Ref. "Instructions in Army Telegraphy and Telephony", HMSO 1916, pp 114.
Note the insulated front terminals. Cover not shown.
It has been mistreated in the past - it has lost its wooden base and been drilled to take a switch and jack socket.
The i10 gets a new steering wheel which has controls for telephony and even to audio controls which makes controlling the system easier for the driver.. Read full Hyundai i10 Sportz 1.2 review. Visit Hyundai i10 car in India page on CarWale to know about prices, specs, features etc.
Red Winged black birds in season in April-May. I call them Thugs because they chase all the other birds away including Vultures and Hawks.
The city was the capital of Brazil for nearly two centuries, from 1763 to 1815 during the Portuguese colonial era, 1815 to 1821 as the capital of the United Kingdom of Portugal, Brazil and Algarves, and from 1822 to 1960 as an independent nation. Rio is nicknamed the Cidade Maravilhosa or "Marvelous City."
Rio de Janeiro represents the second largest GDP in the country [5] (and 30th largest in the world [6]), estimated at about 140 billion reais (IBGE/2007), and is the headquarters of two major Brazilian companies – Petrobras and Vale, and major oil companies and telephony in Brazil, besides the largest conglomerate of media and communications companies in Latin America, the Globo Organizations. The home of many universities and institutes, it is the second largest center of research and development in Brazil, accounting for 17% of national scientific production – according to 2005 data.[7]
Rio de Janeiro is the most visited city in the southern hemisphere and is known for its natural settings, carnival celebrations, samba, Bossa Nova, balneario beaches[8] such as Copacabana, Ipanema and Leblon. Some of the most famous landmarks in addition to the beaches include the giant statue of Christ the Redeemer ('Cristo Redentor') atop Corcovado mountain, named one of the New Seven Wonders of the World; Sugarloaf mountain (Pão de Açúcar) with its cable car; the Sambódromo, a permanent grandstand-lined parade avenue which is used during Carnival; and Maracanã stadium, one of the world's largest football stadiums.
RIGA, Latvia - Sgt. Jeremy Black (left) and Spc. Peter Van Hemert, information specialists with the Pennsylvania National Guard's 28th Infantry Division, provide communications support to Saber Strike 2014. The soldiers are tasked to ensure the uninterrupted computerized and telephonic support between the division headquarters and its coalition partners. "The network and services most be configured and functioning properly, so that the flow of communication is not halted," said Black of New Bloomfield, Pa. He further stated, "If any issues interfere with the communication piece, they must be rectified swiftly and accurately as not to encounter delays in the flow of information." Van Hemert of Williamsport, Pa. added that “we also provide the capabilities for the soldiers to connect to the outside world via Wi-Fi." (U.S. Army National Guard photo by Lt. Col. Desiree Morasco/Released)
1927, Hubbell & Benes
This building inspired the creators of the Superman comic series in their design of the fictional "Daily Planet" building.
The building, shortly after its opening, was nicknamed "The Temple to Telephony".
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Also visible, in the right foreground, is the Caxton Building:
Caxton Building - 812 Huron Road East, Cleveland
1903, Frank S. Barnum
rickzimmerman.hubpages.com/hub/The-Caxton-Building-Clevel...
Set of weather icons designed for zabava.ru, online digital media store operated by Russia's leading long-distance telephony provider.
Arturo Torres of Adaptix Networks (center) receives his certificate of completion for participating in the June 2011 Xorcom USA Certified Reseller training course from instructors Bill Soto (left) and Ross Ryding (right).
Battersea Studios is located only minutes from Sloane Square in the heart of London. The complex boasts 24 hour security (and e-card entry) plus café and exceptional staff facilities and common areas:
Office for 42 with PC and telephone with redundant connectivity via etv Vauxhall and direct to BT.
etv studio 2: 12m x 8m with lead-lining and sound-proofing. 4 studio cameras (on peds) with autocue and 6 additional Sony BRC300 cameras. Lighting rig, control desk and 32 lights.
Vertigo XG graphics with customisable UI - capable of receiving live data and displaying it on screen (votes, SMS, pricing etc).
GeeVs 3 channel video server, traditional VT decks (SDI) and 4 DVS Blade Video servers to play content to air or to the 6 on-set plasma screens or projectors.
Connectivity: 24 hour facility line to BT Tower, UPS and generator power redundancy and advanced redundant telephony and internet.
Co-located green room, make-up, two dressing rooms, storage and crew room and four edit suites equipped with Avid Adrenalines.
The Session urges all stakeholders to ensure that ICTs, and especially access to mobile telephony and broadband Internet access, need to be fully recognized by the international community in the UN’s post-2015 development agenda to empower people intellectually and financially, to open up fresh employment opportunities, and to give people greater access to learning and education, and health services.
Day 4
16 May 2013
ITU/ J.M. Planche
80-G-216175: USS King (DD 242). In the engine room on Pacific Coast convoy duty, there is constant telephonic communication with bridge. An eye on dozens of instruments at same time is necessary. Man equipped with headset. Photograph received March 8, 1944. U.S. Navy Photograph, now in the collections of the National Archives. (2016/11/25).
Battersea Studios is located only minutes from Sloane Square in the heart of London. The complex boasts 24 hour security (and e-card entry) plus café and exceptional staff facilities and common areas:
Office for 42 with PC and telephone with redundant connectivity via etv Vauxhall and direct to BT.
etv studio 2: 12m x 8m with lead-lining and sound-proofing. 4 studio cameras (on peds) with autocue and 6 additional Sony BRC300 cameras. Lighting rig, control desk and 32 lights.
Vertigo XG graphics with customisable UI - capable of receiving live data and displaying it on screen (votes, SMS, pricing etc).
GeeVs 3 channel video server, traditional VT decks (SDI) and 4 DVS Blade Video servers to play content to air or to the 6 on-set plasma screens or projectors.
Connectivity: 24 hour facility line to BT Tower, UPS and generator power redundancy and advanced redundant telephony and internet.
Co-located green room, make-up, two dressing rooms, storage and crew room and four edit suites equipped with Avid Adrenalines.
Wellington Post Office
Wellington Post Office, with an earlier section completed in 1869 and a front two-storey section completed 1904, is of historical significance due to the survival of the early components, including kitchen and stables building. The two distinct phases in the development of the post office are reflective of the growth of the town in the late nineteenth and early twentieth centuries, with the decision to extend the existing post office rather than construct a new building reflective of the economic limitations of the Postmaster General’s Office at the turn of the century. The post office is also associated with the early career of the important and influential Colonial Architect, James Barnet (Criterion a). Wellington Post Office retains substantial sections of the early 1860s post office on the site, including kitchen component and stables building. This is rare in a post office property (Criterion b). Typologically, Wellington Post Office initially combined a postal hall and telegraph office with an associated domestically scaled postmaster’s residence. This early arrangement was later altered through the introduction of the 1904 two-storey addition at the front, which combined a larger postal hall with larger residence, although the 1860s building remained largely intact. The later postal hall was also subsequently divided up and altered. In spite of these alterations and the removal of the telegraphic, telephonic and residential functions, the reasonably good level of internal and external integrity of planning, form and fabric to the later period provides evidence of the program and use of spaces from this time. Overall, the retention of much of the original fabric of one of the earliest post offices in New South Wales, in conjunction with the retention of much of the original fabric from a major upgrade of the building in 1904 is notable. Architecturally and stylistically, Wellington Post Office is a cohesive amalgam of the two main phases of construction (1869 and 1904). The property demonstrates principal characteristics of both the Victorian Georgian and Federation Arts and Crafts architectural styles. The first phase of the post office reflects the persistent use of Colonial Georgian details (and plainness) in many Victorian buildings on limited budgets, while the Federation envelope around it retains a consciously Old Colonial flavour in its symmetry and encircling verandah (Criterion d). Wellington Post Office also has aesthetic value due to its unusual combination of architectural styles from two distinct periods remaining intact. The addition has been well integrated, and has distinctive characteristics such as the prominent roof forms accentuated by two slender symmetrical chimneys, large arched openings and the arcaded porch. The location of the post office in a predominantly turn of the century streetscape also makes it a focal point of the Wellington civic precinct, endowing it with landmark qualities. The architectural style of the post office also complements that of the nearby Court House (Criterion e).
The curtilage includes the title block/allotment of the property.
The significant components of Wellington Post Office include the main postal building and former quarters, kitchen block and stables comprising fabric dating from 1869 through to 1904, with the main two-storey façade to Maugham Street dating from the latter works.
About Tpad (www.tpad.com)
Tpad is an international telecommunications company with over 1000 customers in the UK and operating internationally from regional offices in Dubai and Cyprus. With over 20 years experience in the IT Sector, our expertise spans the development, manufacture and installation of business telephony services. Tpad offers solutions to meet all requirements ranging from Managed IP/PBX solutions to complex Contact Centre installations. The Tpad Global Phone Network that has unlimited call handling capacity and our in-house developed software provides an on-net feature rich environment with functionality that includes network based call recording, call reporting, least cost routing, Diallers, Multi-Site solutions and much more.
With over 100 operatives within dedicated Service, Support and Development teams, we pride ourselves on service excellence and after sales care, consistently delivering some of the highest level of support within the industry. Our services are backed by a choice of service levels to dovetail with the skill sets within your organisation.
The Tpad Platform and solutions are able to operate using third party connectivity. However, Tpad is able to offer a range of connectivity solutions by partnering with its sister company, Internexus. With over 12 years in the sector, that includes the provision and management of network solutions for Supanet, the largest independent Internet Service Provider in the UK with over 500 thousand customers using the a range of services from Internet access, line rental and carrier pre-select services, Tpad and Internexus boast experience and knowledge that almost is unparalleled within the industry. Indeed, it was this combined experience that led to the establishment of Tpad's On-Net Voice Platform in 2005, when users were first given the ability to log in and make phone calls over the Internet. Whilst we have come a long way since then, adding the Tpad Platform to our broad range of business IP/PBX equipment powered by industry leading connectivity make our systems a truly one-stop solution.
Tpad's exciting product range is constantly evolving to keep pace both with technological advancements and our commitment offering our customers new and improved features and enhanced capabilities. At the same time we remain true to our core values of providing reliable cutting edge technology with outstanding service delivery. Telecommunications are the foundations on which almost every business in the 21st century is built. Information is power and communication is king. Whatever your requirements Tpad is ideally positioned to deliver a flexible cost-effective solution to satisfy your organisation's telecommunications requirements both for today and in the years to come. Let Tpad be a valuable partner in your business.
* Intel® Atom™ processor
* 8.9-inch WSVGA display (non-glare)
* 60 or 80 GB hard disk capacity
* 1 GB memory
* Integrated 1.3 Mpixel webcam and digital array microphone for
easy video telephony
* Integrated WLAN, LAN and Bluetooth®
* Interfaces: VGA, USB 2.0, ExpressCard (34 mm), 4-in-1 card
reader, 2x audio
* Special Features: long battery runtime (about 4 hours depending
on usage), silent mode function
* Weight: ~ 1 kg
* Additional accessories: clip-on covers with different colors,
external optical disc drive with Nero software suite (via USB 2.0),
6 cell battery
------------------------------------------------------------------------------------------
* Intel® Atom Prozessortechnologie
* 8,9-Zoll WSVGA Display (matt)
* Intel® Graphics Media Accelerator 950 (shared memory)
* Integrierte Webcam mit 1,3 Megapixel und digitalem Array-
Mikrofon für Videokonferenzen und Internet-Telefonie
* Integriertes WLAN, LAN und Bluetooth®
* Schnittstellen: VGA, USB 2.0, ExpressCard (34 mm), 4-in-1
Kartenleser, 2x Audio
* Highlights: lange Akkulaufzeit (über 4 Stunden,
Nutzungsabhängig), Silent mode Funktion
* Gewicht: ~ 1 kg
* Optionales Zubehör: Aufsteckbare Cover in verschiedenen
Farben, externes optisches Laufwerk mit Nero Software Suite
(über USB 2.0), 6-Zellen Akku
In this data visualisation work the unseen landscape where broadcasting happens – the electromagnetic spectrum – is brought to life. Artists Jose Luis de Vincente & Irma Vila worked in collaboration with Bestiario, the Barcelona-based creators who specialise in making intangible things such as networks and relationships more visible to us all.
The radio part of the electromagnetic spectrum is something that cannot normally be seen with the naked eye. This work shows the structure and topology of the spectrum and reveals what kinds of activities happen there, from television and radio, to mobile telephony and wireless internet. Atlas of Electromagnetic Space also showed the assignation of frequencies to different communication protocols, and the cultural, social and artistic interventions that are currently taking place in the spectrum.
Displayed on several large plasma screens located in the central foyer of Middlesbrough’s Institute for Digital Innovation, this installation enabled visitors to interact with the electromagnetic spectrum, and learn more about it.
Biography
José Luis de Vicente is a cultural researcher, curator and journalist. He develops projects around creative innovation and social technologies. Among other projects, he directs the VISUALIZAR program at the Medialab Prado art production centre, Madrid. He is a member of the curation committee of Sónar, Barcelona, and a member of the board of FAD, Barcelona's association for Arts and Design. He has been deputy director of ArtFutura and artistic codirector of the Offf Festival. Irma Vilà is a curator and a cultural producer. She explores art, science, society and new media intersections, as a result of her background in physics, multimedia, engineering and arts. She has collaborated in the production and RRPP of festivals as Sónar, Offf and Copyfight as well as in exhibitions in the Center for Contemporary Culture of Barcelona (CCCB). Nowadays she works as curator and communication coordinator of ArtFutura Festival, and with Telenoika audiovisual artists collective.
Credit
Co-commissioned by AV Festival 08 and NOW: Centre de Cultura Contemporánia de Barcelona (CCCB).
Photos from the SIP Network Operators Conference (SIPNOC) held in June 2012 in Reston, VA, USA.
For more information, please visit www.sipnoc.org/
Permission is granted to use the photo in other content provided that a link is made back to the photo here.
If you are in the photo and wish a copy of the original image file, please contact Dan York
Photos from the SIP Network Operators Conference (SIPNOC) held in June 2012 in Reston, VA, USA.
For more information, please visit www.sipnoc.org/
Permission is granted to use the photo in other content provided that a link is made back to the photo here.
If you are in the photo and wish a copy of the original image file, please contact Dan York
LocustWorld and IICD have built a wireless mesh and bringing internet connectivity and voice telephony in remote mountain towns to support the Bolivian agricultural economy.
Close-up portrait of a beautiful business woman, wearing a headset. Situated in her office with colleauges in the background.
Photos from the SIP Network Operators Conference (SIPNOC) held in June 2012 in Reston, VA, USA.
For more information, please visit www.sipnoc.org/
Permission is granted to use the photo in other content provided that a link is made back to the photo here.
If you are in the photo and wish a copy of the original image file, please contact Dan York
I have not heard of Erlang Solutions before.
When I was a Telecoms Engineer an Erlang was a dimensionless unit that was used in telephony as a measure of offered load or carried load on service-providing elements such as telephone circuits or telephone switching equipment. For example, a single cord circuit has the capacity to be used for 60 minutes in one hour. More recently: Erlang is a general-purpose, concurrent, garbage-collected programming language and runtime system. The sequential subset of Erlang is almost a functional language (excluding certain built-in functions (BIFs) such as those manipulating the process dictionary), with eager evaluation, single assignment, and dynamic typing. It was originally designed by Ericsson [I was a Quality Engineer with them for 10 years] to support distributed, fault-tolerant, soft real-time, highly available, non-stop applications. It supports hot swapping, thus code can be changed without stopping a system.
Erlang Solutions specialises in supporting businesses with the creation, integration, delivery and lifetime support of products and services based on the Erlang programming language, from small developers to Fortune 500 corporations.
Unlike other software services companies Erlang Solutions is the only company of its kind totally focused on Erlang and the Erlang community, offering industry-leading research, development, training and worldwide support for businesses using Erlang.
That the real innovation in mobile telephony lies not in the eagerly anticipated latest iPhone models but rather in mini-factories in the Chinese hi-tech hub, Shenzhen (where iPhones too are produced), is amply demonstrated by the group DISNOVATION.ORG.
In collaboration with researcher Clément Renaud and Hongyuan Qu, the artists Nicolas Maigret and Maria Roszkowska collected strikingly designed mobile phones in Shenzhen, which took such fantastic forms as strawberries or cars, or had impressive technological features. The Powerbank phone, for instance, runs up to three SIM cards in parallel and has an integrated battery that can charge other devices. Others have an in-built lighter or electric razor. This market is geared not so much to the Western middle-classes as to the rural populations of Africa or inland China. Set up as a typical sales stand, 'Shanzhai Archeology' presents the product range of these mini-companies, which fuse creativity, copy/piracy/remix-ventures and self-taught skills to develop new products in a matter of weeks. However, Shanzhai (Chinese: pirate) culture is under threat - not so much from miserable working conditions as from the Chinese government's endeavours to clean up the country's counterfeiter reputation. Yet, although often dissed for poor quality, the devices on show here, given their extraordinary qualities and style, pose a serious challenge to the West's hyper-standardised approach to technology and to the built-in obsolescence paraded under the guise of innovation.
Conception: DISNOVATION.ORG (With Clément Renaud & Yuan Qu)
... simplified block diagram ... A.M. transmitter ...
... the 'Q Type’ transmitter was an evolution of that designed by Marconi's Wireless Telegraph Company Limited for the experimental station MZX and broadcasting station 2MT. These designs were, in turn, based on earlier telephony transmitters that used amplitude modulation (A.M.) dating back to the first world war.
The 'Q Type’ was designed by Captain Henry Joseph Round MC, assisted by C. S. Franklin, and incorporated enhancements over the earlier design used for 2MT. These included a higher rated output power of approximately 1 kW and the elimination of some single points of failure to increase the system's availability. The first 'Q' type transmitter was used in November 1922 as an upgrade for station 2LO, located in London. The subsequent British Broadcasting Company stations, including 6BM at Bournemouth, also used the 'Q' type transmitter.
The designers could have chosen to modulate the grid of the Modulated Amplifier triode but the valve had a non-linear gain characteristic. This method would therefore have introduced too much distortion. They instead selected direct 'plate' or anode modulation to optimise the quality of the modulated signal, even though this needed four MT7B high power triodes to generate the necessary audio frequency power.
A large iron-cored ‘speech choke’ ensured that the amplified audio frequency signal was impressed on the Modulated Amplifier’s EHT plate supply and reflected away from the EHT supply smoothing filter. This enabled the radio frequency signal to become amplitude modulated, with a modulation factor of nearly 100%.
The high power triode valves were developed by Marconi's and manufactured at the Osram Lamp Works (Marconi-Osram Valves or MOV). These large air-cooled valves were fairly primitive triodes:
MT4 - medium power triode, 80 watts anode dissipation. Maximum cathode current: 0.3 amps. Filament: 12.5 volts, 6.3 amps. Used for the Sub-Modulator at audio frequency.
MT7B - high power triode, 500 watts maximum anode dissipation. Four MT7B's were used in parallel for the Modulator at audio frequency.
MT2 - medium power triode, 300 watts continuous anode dissipation. Maximum cathode current: 1.0 amps. Filament: 17 volts, 15 amps. The MT2's were used for the Master Oscillator and the Modulated Amplifier at radio frequency.
Unlike most of the other BBC stations commissioned in 1923, Bournemouth had a purpose-built transmitter hut with a battery room, motor room, transmitter room and office.
Reference: 'The Saga of Marconi-Osram Valves' by Barry Vyse and George Jessop.
Reference: Description of 2LO Transmitter, by Rod Viveash, Appendix A to ‘From Hidden Technology to Exhibition Showpiece: The Journey of 2LO, the BBC’s First Radio Transmitter, 1922-2012’ by Dr. Alison Hess, Royal Holloway, University of London.
Engineers assigned to 6BM included:
L. A. V. Everitt
A. Walker
R. Haworth
R. G. ‘Tiny’ Durham
Builders have ripped the facade from this old exchange [there used to be some boarding over it hiding the doors] in anticipation of developing it. The white boards used to be doors to phone 'cublicles'. Amazing to think that telephony used to be a 'fixed' phenomenon with a very different socio-cultural geography to what we have now. I would imagine the telephone exchange was quite an interesting place to hang out - where public and private space came up against each other.
Crouch End, London, N8.
P. Metzger, Deputy to the Director; ITU BDT
The Session urges all stakeholders to ensure that ICTs, and especially access to mobile telephony and broadband Internet access, need to be fully recognized by the international community in the UN’s post-2015 development agenda to empower people intellectually and financially, to open up fresh employment opportunities, and to give people greater access to learning and education, and health services.
Day 4
16 May 2013
ITU/ J.M. Planche