| 词条 | Madley Communications Centre |
| 释义 |
| name = Madley Communications Centre | native_name= | former_names = | alternate_names = | image = MadleySateliteEarthStation(PhilipHalling)Apr2006.jpg | caption = Earth receiving dishes | map_type = United Kingdom Herefordshire | altitude = | building_type = Earth station | architectural_style = | structural_system = | cost = | ren_cost = | location = Kingstone, Herefordshire | address = | client = | owner = BT Group | current_tenants = | landlord = BTFS | coordinates = {{coord|52.03198|-2.84049|region:GB-HEF|display=inline,title}} | start_date = 1975 | completion_date = 1993 | inauguration_date = September 1978 | renovation_date = | destruction_date = | height = | diameter = | other_dimensions = | floor_count = | floor_area = {{convert|218|acre|km2}} | main_contractor = | architect = | architecture_firm = | structural_engineer = | services_engineer = | civil_engineer = | other_designers = | quantity_surveyor = | awards = | ren_architect = | ren_firm = | ren_str_engineer = | ren_serv_engineer = | ren_civ_engineer = | ren_oth_designers = | ren_qty_surveyor = | ren_awards = | references = }} Madley Communications Centre is BT Group's earth satellite tracking station, between Madley and Kingstone, Herefordshire, England. Earth positionIt lies on Coldstone Common at {{gbmapping|SO424374}}.[1] The site dates from 1975 and is in active use for international telephone, fax and television transmission and reception. The station is in the civil parish of Kingstone, although most of the former airfield is in Madley, to the west of the site. A Roman road passes close to the north of the site. Geology of the areaThe site is in a sheltered rock bowl between the Malvern Hills and the Black Mountains. This allowed the ground to take the weight of the large receiving dishes, but the most important fact was the lack of background electronic noise. What nearby electronic noise there was compared to the strength of heat felt on the Moon from an electric fireplace on Earth.{{citation needed|date=April 2013}} HistoryThe site first went into service in September 1978[2] on the site of the disused World War II airfield RAF Madley,[3] built in 1940. StructuresThere are over 65 dishes, the smallest being 90 cm with the three main dishes each having a diameter of 32 metres and weighing 290 tonnes. Madley 1, the first of the dishes, tracks a satellite about {{convert|22236|mi|km}} away, positioned over the Equator in geostationary orbit. The site covers a range from 66 degrees east to 314 degrees east, covering two thirds of the planet. TransmissionsMadley was the first UK satellite site to transmit a fully digital transmission via time division multiple access (TDMA).{{citation needed|date=February 2013}} Until its closure in 2008, Goonhilly in Cornwall provided a similar role. Other use of groundsThe grounds are leased as an educational nature reserve, Madley Environmental Study Centre. References1. ^{{cite web|url=http://www.smr.herefordshire.gov.uk/db.php?smr_no=42062|work=Historic Herefordshire Online|title=SMR record 42062 - Madley Satellite Communication Centre|author=Tony Reeve|year=2005|accessdate=2006-09-10}} 2. ^BBC news report of anniversary celebrations, 25 September 2008 3. ^{{cite web|url=http://www.smr.herefordshire.gov.uk/db.php?smr_no=12530|work=Historic Herefordshire Online|title=SMR record 12530 - Airfield, Madley|author=Hilary White|year=1992|accessdate=2006-09-10}} External links
4 : British Telecom buildings and structures|Buildings and structures in Herefordshire|Earth stations in England|Buildings and structures completed in 1978 |
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