THE SERVICE AREAS OF THE GREAT GLEN CHAIN OF TELEVISION AND V.R.F. SOUND TRANSMITTERS

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1 RESEARCH DEPARTMENT THE SERVCE AREAS OF THE GREAT GLEN CHAN OF TELEVSON AND V.R.F. SOUND TRANSMTTERS Technological Report No. K-171 ( 1964/24) R,C. Vercoe H.T. Madoc-Jones J.A. Carter (W. Proctor Wilson)

2 This Report is the property of the British Broadcasting Corporation and aay Dot be reproduced 1n any form without the written permission or the Corporation.

3 Report No. K~171 THE SERVCE AREAS OF THE GREAT GLEN CHAN OF TELEVSON AND V.H.F. SOUND TRANSMTTERS Section Title Page SUBJECT THE GREAT GLEN CHAN 1 2. SUMMARZED DESCRPTON OF THE TRA.NSMTTERS 1 3. SURVEY RESULTS COMMENTS ON SERVCES 4.1. General Fort William 4.3. Ballachulish 4.4. Kinlochleven 4.5. Ob an APPENDX 13 APPENDX 14

4 April 1964 Technological Report No. K-171 (1964/24) THE SERVCE AREAS OF THE GREAT GLEN CHAN OF TELEVSON AND V.H.F. SOUND TRANSMTTERS SUBJECT The results of field strength surveys of the Great Glen Chain of television and v.h.f. sound transmitters are given in this report. 1. THE GREAT GLEN CHAN The chain comprises the stations at Fort William. Ballachulish. Kinlochleven and Oban. All of these stations radiate television and v.h.f. sound programmes except Ballachulish, which radiates television only. The parent station for the chain is Rosemarkie. On the high ground above Fort Augustus both television and v.h.f. sound transmissions are rec'eived and the vision signal is re-radiated by s.h.f. link to the Fort William transmitter. The Fort William television transmission is received at Ardgour, where a split s.h.f. link feeds the signals direct to the Ballachulish transmitter and via a passive reflector to Oban. Ballachulish radiates the vision transmission on Band and the signal is re-broadcast by Kinlochleven. The v.h.f. Third and Light Programmes distribution from Fort Augustus is by GPO line. The Home Service is fed to the chain from Glasgow by GPO line. A schematic diagram showing the television and v.h.f. sound distribution through the Glen is given in Fig. 1. The geographical locations of the v.h.f. transmitters and s.h.f. link sites are shown in Fig SUMMARZED DESCRPTON OF THE TRANSMTTERS Details of the Great Glen transmitters are given in Appendix. 3. SURVEY RESULTS n Figs. 3 and 4, 5 and 6, and 7 and 8 are shown the field strength contours of the Fort William, Kinlochleven and Oban television and v.h.f. sound transmissions respectively. The contours for the Ballachulish television transmission are given in Fig. 9. Composite maps showing the nominal field strength limits of the television and v.h.f. sound services (40 db(~v/m) for television and 48 db(~v/m) for v.h.f. sound) provided in the Great Glen are given in Figs. 10 and 11 respectively. The values of measured field strength for both services exceeded at 10%, 50% and 90% of the locations in the towns and villages measured are given in Appendix 11.

5 2 4. COMMENTS ON SERVCES 4.l. General The terrain on both sides of the Great Glen is very mountainous. it follows that: From this (i) (ii) (iii) The serv1ce areas of the stations are very restricted. The field strength contours shown cannot be other than approximate. The field strength protected against United Kingdom co-channel may be less than the value indicated on the maps. ~interference Obon television ) ( and VH F sound Ardgour ( television) SHF link Ft.WiDiam tetevision ) ( and VHF sound Ft.AugustuS ( television) SHF link Rosemarkie televi sion ) ( and VHF sound! k Glasgow Kinlochleven (televisiolland VHF sound), / ' oe / Land T / VHF transmitters 0 S H F tra nsm itters Light and Third GPO lines { ---Home Fig. 1- Schematic diagram of the television and v.h.f. sound distribution through the Great Glen 4.2. Fort William The Fort William station provides excellent services in the town of Fort William and all nearby villages except Corpach. Corpach is situated at the entrance to Loch Eil, but is screened locally from the transmitter. This village is also subject to severe ghost signals reflected from the surrounding mountains Ballachulish The Ballachulish station (television only) provides an excellent serv1ce 1n Onich, North Ballachulish, Glencoe, East Laroch and West Laroch Kinlochleven The Kinlochleven television and v.h.f. sound transmitters provide very good services in the village of Kinlochleven and, together with the Ballachulish station, they provide a very good television service throughout the entire length of Loch Leven Oban The Oban television and v.h.f. sound transmitters serve the population on or near the shores of Loch Linnhe, the Firth of Lorne and the Sound of Mull. Tobermory, at the distant end of the Sound of Mull, is well served with a median field strength of 61 db(,uv /m).

6 3 Fig. 2 The geographical locations transmitters and s.h.f. of the v. h. f. link sites 10 Kilometres Topogr.pi'li(:al inforjation based upon ti!eordnat1ce Survey map witl! tl!esanetionoftnecontrollerofh.m. StationtryOffice. 'Cr_ eo.yriqht r"."'..

7 4 Fig. 3 Map T FORT WLLAM Band Channel 5 (Measured) STE HEGHT: 50 ft (15 2 m) a.m.s.l. AERAL HEGHT: 147 ft (45 m) a.g.l. E.R.P.: 1'4-1'8 kw POLARZATON: AERAL: HORZONTAL TWO TER SUPERTURNSTLE H.R.P. : AERAL SECTON DWG. NO. AE. 509 NOTES: 1. 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 hi~ly and built-up areas. 2. -x-x-x- Limit of service area free from perceptible co-channel interference from all U.K. cochannel 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 directi vi ty.

8 5 Fig. 4 Map. F FORT W1LL1AM Band 11 (Measured) (Light 89'3 Mc/s; Third 91' 5 Mc/s; Home 93'7 Mc/s) STE HEGHT: AERAL HEGHT: E.R.P. : POLARZATON: AERAL: 50 ft (15 2 m) a.m. s.l. 118 ft (36 m) a.g.l kw HORZONTAL TWO TER SUPERTURNSTLE H.R.P. : AERAL SECTCl' DWG. NO. AE.510 NOTES: 1. 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.

$l, "\\ '~,:" / ( ~\ ) i/ 850 ;: \".,." ') ( t ~t / DD re a,lll ": \ Meodhoin.. J \,..-.,.> \ ) "",.! ~ ')04 i..;-: ;>1>' ~/:'"r // /~~ --- ~J \ Torn,/" GuaiolrJrl J Fig. 5 Map T.$

9 l, "\\ '~,:" / ( ~\ ) i/ 850 ;: \".,." ') ( t ~t / DD re a,lll ": \ Meodhoin.. J \,..-.,.> \ ) "",.! ~ ')04 i..;-: ;>1>' ~/:'"r // /~~ --- ~J \ Torn,/" GuaiolrJrl J Fig. 5 Map T KNLOCHLEVEN Band Channel 1 (Measured) STE HEGHT: 900 ft (274 m) a.m.s.l. AERAL HEGlT: 50 ft (15 2 m) a. g.l. AERAL: SNGLE VERTcAL DPOLE -cb- H.R. P., RESEARCH DEPARTMENT REPORT NO. E-088 E.R.P.: watts POLARZATHl'l: VERTCAL NOTES: The contours represent the field strength in decibels (db) relative to ~V/m at 30 ft t9'1 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. --x--x--x- Limit of service area free from perceptible co-channel interference from all U.K. cochannel 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 directi vi ty.

10 ,'ll Fig. 6 Map F K1NLOCHLEVEN Band 11 (Measured) (Light 89'7 Mc/s; Third 91'9 Mc/s; Home 94'1 Mc/s) STE HEGHT: 900 ft (274 m) a.m.s.l. H.R.P. : AERAL HEGHT: E.R.P. : POLARZATON: 67 ft (20'2 m) a.g.l watts HORZONTAL AERAL: SNGLE TER CROSSED DPOLE RESEARCH DEPARTMENT REPORT NO. E-088. NOTES: 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.

11 8 Fig. 7 Map T OBAN Band Channel 4 (Measured) STE HEGHT: 400 ft (122 m) a.m.s.l. AERAL: TWO TERS VERTCAL DPOLES AERAL HEGHT: 132 ft (40 m) a.g.l. E.R.P. : kw H.R.P., ~ N POLAR! ZAT ON : VERTCAL RESEARCH DEPARTMENT REPORT NO. E- 090 NOTES: The contours represent the field strength in decibels (db) relative to ~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. -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.

12 9 Fig. 8 Map F OBAN Band (Measured) (Light 88 9 Mc/s; Third 91 1 Mc/s; Home 93 3 Mc/s) STE HEGHT: 400 ft (122 m) a.m.s.l. AERAL: TWO TERS CROSSED DPOLES AERAL HEGHT: 162 ft (49 4 m) a.g.l. E.R.P. : kw H.R.P. : POLAR ZA T ON: NOTES: HORZONTAL RESEARCH DEPARTMENT REPORT NO. E-090 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.

13 10 o f% ::tp-q 5 Cl Fig.9 Map T BALLACHVLSH Band Channe l 2 (Measured) STE HEGHT: 50 ft (15 2 m) a.m.s.l. AERAL: SNGLE VERTCAL DPOLE AERAL HEGHT: E.R.P. : POLARZATON: NOTES: 110 ft (33 5 m) a.g.l watts VERTCAL H.R.P. : RESEARCH DEPARTMENT REPORT NO. E The contours represent the field strength in decibels (db) relative to ~V/m at 30 ft (9 1 m) above ~round exceeded at 50% of receiving si tes in a gi ven locality. The value exceeded at 90/0 of receiving sites may be as mucb 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 dbwith a reduction of 10 db for cross polarization and 10 db for frequency offsets, allowance being made for receiving aerial directivity.

14 11 Fig. 10 Composite map showing the nominal service area limits [field strength = 40 db(~v/m)] of the television service in the Great Glen

15 12. ~<;",O"~eil'2C}-~ 10 K!1.8~et res -opog~apnlci!.; '~.fo~11a' or, tased "oor t,'e Occ~arce t~e sanct'on of ~~ COl'ltrol:e c of H.~. S:a~lc~e'-f O~.& ~CroWfl Copyrl ht reservec", Fig. ii Composite map showing the nominal service area [field strength=48 db(f,lv/m)] of the v.h.f sound service in the Great Glen

16 13 APPENDX Great Glen Chain FORT WLLAM BALLAOULSH Television V.H. F. Sound Tel evi sion BAND CHANNEL FREQUENCES 5 - VisiOli: Mc/s Light: 89-3 Mc/s Sound: Mc/s Third: 91-5 Mc/s Home: 93-7 Mc/s 2 Vision: Mc/s Sound: Mc/s STE HEGHT (a.m.s.l.) 50 ft (15-2 m) 50 ft (15-2 m) 50 ft (15-2 m) AERAL HEGHT 147 ft (45 m) (a. g.l.) ll8 ft (36 m) TRANSMTTER POWER 1 kw 1 kw (two 0-5 kw units) (one 1 kw unit) AERAL E.R.P. POLARZATON H.R.P. RESEARCH DEPARTMENT REPORT NO. Two tiers (super turnstile) kw Horizontal See Fig_ 3 No report issued Two tiers (super turnstile) kw Horizontal See Fig, 4 llo ft (33-5 m) 0-1 kw (one 0-1 kw unit) Two tiers (crossed dipoles) watts Vertical See Fig, 9 E-089 KNLOCHLEVEN OBAN Television V.H.F. Sound Television V. H. F. Sound BAND CHANNEL FREQUENCES Vision: Mc/s Light: 89-7 Mc/s Vision: Mc/s Light: 88-9 Mc/s Sound: Mc/s Third: 91-9 Mc/s Sound: Mc/s Third: 91-1 Mc/s Home: 94'1 Mc/s Home: 93-3 Mc/s STE HEGHT(a.m.s.l.) 900 ft (274 m) 900 ft (274 m) 400 ft (122 m) 400 ft (122 m) AERAL HEGHT,( a. g.l. ) TRANSMTTER POWER AERAL E.R.P. POLAR ZA T ON H.R.P. RESEARCH DEPARTMENT REPORT NO. 50 ft (15' 2 m) 4- watts Single vertical dipole 67 ft (20-2 m) 7 watts Single tier (crossed dipoles) watts 1< watts Vertical Horizontal See Fig 5 See Fig. 6 E ft (40 m) 1 kw (two 0-5 kw units) Two tiers (vertical dipoles) '2 kw Vertical See Fig, 7 E ft (49-4 m) 1-5 kw (two 1 kw units) Single vertical dipole kw Horizontal See Fig.8

17 14 APPENDX 11 Great Glen Chain Town Field Strength (db(,uv m) ) for Stated Percentage Locations Television V.H.F. Sound 10% 50% 90% 10% 50% 90% Fort William Ardgour Caol Corpach Fort William Lochyside Spean Bridge Kinlochleven Kinlochleven Ballachulish East Laroch Glencoe Kinlochleven North Ballachulish Cklich West Laroch Oban ALG Black Crofts Connel Craignure Cullipool Dun staffnage Easdale Lochaline Lochbuie New Selma Oban Port Appin Portnacroish Salen Taynuilt Tobermory Printed by BBC Research Department, Kingswood Warren, Tadworth, Surrey

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