The service areas of the Kirk 0' Shotts television and v.h.f. sound transmitters

Transcription

1 RESEARCH DEPARTMENT The service areas of the Kirk 0' Shotts television and v.h.f. sound transmitters TECHNOLOGICAL REPORT No. K /75 THE BRITISH BROADCASTING CORPORATION ENGINEERING DIVISION

2 RESEARCH DEPARTMENT (1964/75) THE SERVICE AREAS OF THE KIRK 0'880TTS TELEVISION AND V.B.F. SOUND TRANSMITTERS Technological Report No, K-177 H,T, Madoc-Jones J,A, Carter (R,D,A, Maurice)

3 This Report is the property of the British Broadcasting Corporation and.ay not be reproduced in any form without tbe writted permissiod of the CorporatioD.

4 November 1964 Technological Report No. K-177 (1964/75) THE SERVICE AREAS OF THE KIRK O'SHOTTS TELEVTSI:ON AND V.R.F. SOUND TRANSMITTERS SUBJECT The service area of the Kirk o'shotts Band 11 transmission had never been surveyed. When the survey was started in January 1960 it was decided to include also a check of the Band I service area. The preliminary survey has never been considered satisfactory qn account of the small number of points measured at the time. Because of the pressure of more urgent work, the measurements extended over the period January 1960 to February 1964.,The Band I measurements give more detailed information of the service area and largely confirm the preliminary survey. It is of interest to note that in 50% of the towns, the latest measurements are within ± 2 db and 90% are within ± 5 db of the preliminary survey. 1. SUMMARIZED DESCRIPTION OF TRANSMITTERS Television li3and I Cbannel 3 V.H.F. II Frequencies Vision: : Mc/s 53'25 Mc/s Light: Third: Home: 89-9 Mc/s 92-1 Mc/s 94'3 Mc/s Site height (above mean sea level) Aerial height (above ground level) Transmitter power Aerial E.B.P. Polarization H.R.P. 910 ft (277 m) 735 ft (224 m) 50 kw (one unit) Two tiers of four dipoles 98 kw Vertical Onnidirectional 910 ft (277 m) 647 ft (197 m) 20 kw (2 x 10 kw units) Eight tiers of four slots 113 kw Horizontal Onnidi rectional

5 2 2. SURVEY RESULTS Maps T.S97 and F.188 show the field strength contours for the television and v.h.f. sound transmissions respectively. The median field strength values for all towns and villages measured in the course of the surveys are" given in the Appendix. The 10% and 90% values are not given, but if required for any particular town(s) they can be extracted from the field strength charts and made available at short notice. 3. COMMENTS ON SERVICES The television and v.h.f. sound transmissions provide a very good service in the highly populated Central Scotland area. The television transmission is free from United Kingdom co-channel interference down to the nominal service area limit (40 db(~v/m)) but there are highly populated areas on the fringe of the service area which are poorly served by television and v.h.f. sound. In particular the county of Angus is in need of an improved service; this deficiency will be made good when the Forfar (television and v.h.f. sound) and Dundee (television) stations come into service during A low-power television relay station to serve Perth is also due to come into service during The service in parts of Ayrshire is also poor, but the prbposed Toward television and v.h.f. sound transmissions will serve Rothesay, Port Bannatyne, Largs and Skelmorlie, while future individual low-power television transmitters will serve the towns of Ayr and Girvan.

6 3 ~---" ;;' Loch L2'ven 1 " (!, Loc h E rlcht ~ Loch Rannoch Loch Tummel 0 \...0(.'0 otaynuilt Dalmal)y'-' o, Killin / ".ffir Loch Aw. tyerrouth l J ',_"... Goio'S',., ~ s - " ~Roxburgh " B~rwick upon Tweed Miles '- ~1=aBJH~H~=~~~, f EU- - g'e ====~== -----j 2C o 20 K ilomet res Girl/On Map T KIRK 0' SHOTTS Band I Channe l 3 SITE HEIGHT: AERIAL HEIGHT: 910 f t (277 m) a. m. s ft (224 m) a.g.l. AERIAL: TWO TIERS OF FOUR DIPOLES E.R.P. : 98 kw H.R.P. : OMNI DI RECTI ONAL POLARIZATION: VERTICAL NOTES: 1. The contours represent the field strength in decibels (db) relative to 1 }LV/m at 30 ft (9 1 m) above ground exceeded at 50% of receiving sites in a given locality. The value exceeded at 90% of receiving sites may be as much as 10 db below the value indicated by the contours, particularly in hilly and built-up areas. 2. x--x--x-- Limit of service area free from perceptible co-channel interference from all U.K. co-channel transmitters for 90% of the time based on a protection ratio of 45 db with a reduction of 10 db for cross polarization and 10 db for frequency offsets, allowance being made for receiving aerial directivity.

7 4 ~---o-, - _ - --_: Loch Leven, /' ~ Loch Rannoch c. Loch Tummel \----",- / o. { BreCh,;ontrose olnverkeilor otaynuilt DalmaUy'-' a, < " J-~;',' ~_,Ardlul... E yemout h Girvan Sanquhar o, " Map F KIRK 0' SHOTTS Band II (Measured) I o Lauder o Duns Greenlaw ~ '... Q...,' r,'~ _1 't>-,~-... -;.. '- Goloshi<zls ~ '-..., 0Kelso \. ",--' RaXburgh \, Jedburgh,, '7.Bnwick upon Tweed Mil<2S IbH~1~EfA~H""l~H~Et====r=1 ===:jl Kilom<2tr<25 top.g~.phlos1 loro~"'&t1on b&~'~ upon tbe Or~n"nee Sur~~y... p,..1~h th~."notlon of Ue Controller of 11.)1. St~tlon.ry Orrice. Cr._. COp'l"lgh~ re.erved,. Light 89 9 Mc/s; Third 92 1 Mc/s; Home 94 3 Mc/s SITE HEIGHT: AERIAL HEIGHT: 910 ft (277 m) a.m. s.l f t (197 m ) a. g. 1. AERIAL: EIGHT TIERS OF FOUR SLOTS E.R.P. : 113 kw H.R.P. : OMNIDIRECTIONAL POLARI ZA TI ON: HORIZONTAL NOTE: The contours represent the field strength in decibels (db) relative to 1 ~V/m at 30 ft (9 1 m) above ground exceeded at 50% of receiving sites in a given locality. The value exceeded at 90% of receiving sites may be as much as 10 db below the value indicated by the contours, particularly in hilly and built-up areas.

8 5 APPENDIX (dbcuv/m) ) (dbcuv/m» Television V.H.F. Television V.H.F. Aberdour Broxburn and Aberlady Uphall Abernethy Buchaven See Methil Aberuthven Bucheyrie Airdrie &rntisland Airth 80 &rrelton Alexandria Alloa Call ender Alva Cardross Alyth Carluke Anstruther Carnoustie Arbroath Carnwath 86 Ardrossan Carron shore 85 Armadale Carstairs 76 Auchinleck Catrine Auchterarder Ceres Auchtermuchty Clackmannen Ayr Clydebank 74 Coatbridge Balbeggie Cockenzie and Balfron Port Seton Bankfoot Comrie Bannockburn Connel Park Barassie 56 Corstorphine Barrhead Coupar Angus Barry Cowdenbeath Bathgate Coylton 65 Beith Crail Biggar Crieff Birkhill Feus See Mu rhead Crookedholm 48 Bishoptown Crook 0 f De von Blackford Crosshill Blairgowrie Crosshi 11 and B:mhill 42 Lochore Bo'ness Crosshouse Bonnyrigg and Cumnock Lasswade Cupar Bridge of A11an Bl B5 Bridge of Earne Dailly Dalkeith Dalmellington Bridge of Weir Brightons

9 6 (db(p,v/m) ) (db(,uv/m) ) Television V.H.F. Television V.H.F. llilry Greenock Darvel Guard Bridge Denny and Guildtown Dmipace Gullane Dirleton Doune Haddington Dreghorn Hamilton 100 Drongan 56 Harthill no III llimbarton Helensburgh Dunbar Hurlford Dunblane Dundee Innellan 65 Dundonald 63 Innerleithen 42 Dunfermline Invergowrie Dunlop Inverkeithing Dunoon Inverkip Irvine East Kilbride East Linton Jamestown 45 East Wymss Johnstone Eddleston Joppa Edinburgh Elie and Kaimes Ear lsferry Kilbirnie Errol Killearn Eskbank See Dalkeith Kilmacolm Kilmarnock Falkirk Kilmaurs Fallin 84 Kilmun 57 Fenwick 59 Kilsyth Kilwinning Gals ton Kincardine 85 Gatehead 59 Kinghorn Gateside Kinross Gi ford Kirkcaldy Girvan Kirkconnel Glasgow Kirkintillock 81 Glenfarg 49 Kirkmichael 43 Glengarock 54 Kirkoswald 55 Glenrothes Kirriemuir Gorebridge Gourock Lanark Grangemouth Larbert Granton and Larkhill 98 Muirhouse Lasswade See Bonnyrigg

10 7 (db(uv/m) ) (db(j.lv/m) ) Television V.H.F. Television V.H.F. Lauriston 77 Neilston 79 Lenn ox t own Netherthird Leslie Newbridge 83 Lesmahagow 88 New Cumnock Leuchars Newmilns Leven Newport on Tay Linlithgow New Scone Loanhead Newton Grange Loans North Berwick Lochgelly Lochore See Crosshill Ochi1tree Lockwinnock Old Kilpatrick Lockerbie 40 Ormiston Longniddry Lumphinnans Paisley Lmcarty 53 Pathhead Lundin Links Patna Peebles Maddiston Penicuik Maidens Perth Markinch Pittenweem Mauchline Port Glasgow Maybole Portobello 61 Meig1e Port Seton See Cockenzie Menstrie Prestonpans Methil and Prestwick Buchaven Methven Queensferry Milnathort Mi1ngavie Milton Rankinston Redding Milton Renton (Ayrshire) Rhu Milton of Rosyth Ba1gonie Minishant 58 St. Andrews Monk ton St. Fi 11 ans Mossb1own 52 St. Monance M:ltherwell See Wishaw Sa1tcoats Muirhead and Sandbank Birkhill Feus Sanquhar Muirhouse See Granton Seamill and Mlirkirk West Ki1bride Musselburgh Skir ling 60 68

11 8. (db(,uv Im) ) (db(,uv Im) ) Television V.H.F. Television V.H.F. Sorn Tillicoul try Springside 58 Torrance Stanley 58 Tranent Stenhousemuir Troon Stenton 69 Stevenston Uphall See Broxburn Stewarton Upper Largo Stirling Stonehouse 94 West Kilbride See Seamill Strathaven West Linton Strathmiglo Whitburn Whitekirk 55 Tarbolton 67 Windygate Tayport Wishaw and Thornhill Motherwell 96 Thornton Woodside Tignabruaich 50 Wormit CHS Printed by BBC Research Department, Kingswood Warren, Tadworth, Surrey