Telecom TutorialsMonday, June 03, 2013www.tempustelcosys.comLOS SURVEY
Monday, June 03, 2013www.tempustelcosys.com1. Backbone Survey2. Access Survey
Monday, June 03, 2013www.tempustelcosys.comBackbone routes are planned at Lower Frequency Bands2, 6 and 7 GHz Frequency Bands are usedBackbone routes are normally high capacity routesNominal Hop Distances 25 – 40 Km
Monday, June 03, 2013www.tempustelcosys.comFollowing Points to be Consider During Survey:-1. First Plot the Coordinate on SOI Maps and marks the criticalpoints and verify it on field and provide data to your coordinator.2. Collect the Lat/Long of Both Ends3. Feed the both Lat/Long in GPS in WGS-84 Datum.4. Before Start Tracking the route ask the Terrain from localpeople regarding Man-Made Structure as Chimneys, PowerGrid Towers, NTPC Plants or other such factories.5. Its help you to take into consideration these structure becausethese could be very critical in Backbone Links if you miss it.6. Always take the exact Lat/Long of these Structure which is veryHelpful for Transmission Planner.contd.
7. Keep Tracking the Tree Height on the whole Path.8 For path Length more than 20km you should collect atleast 5-6 cross points at the interval of 3-5km.9. The Route Shouldn’t be tracked by GOTO option in GPSwhere as first make a route in GPS that shows the LOSLine on Navigation Page in GPS.10. This page helps you to see your LOS always on yourGPS plus the direction and the distance how far youfrom the LOS.11. Overall keep your eyes and mind open when go forBackbone Survey.Monday, June 03, 2013www.tempustelcosys.com
Monday, June 03, 2013www.tempustelcosys.com29.96 Km 35.33 Km 46.61 Km 43.75 Km 9.75 KmPARULIA MANKAR BURDWANBELMURI HOWRAH CALCUTTA55 M 50 M 100 M 85 M 85 M 50 M55M41.9M48M93.2M96.5M86.5M83.4M73.4M80.280.2M70.2M84.2M74.2M52.6M 50.0M
Tower Height Calculation :Th = Ep + C + OH + Slope – EaC = B1 + FSlope = (( Ea – Eb) d1)/ DF = 17.3 ((d1xd2)/f X D) -1/2B = (d1 x d2) / (12.75 x K )Where,Th = Tower HeightEp = Peak / Critical ObstructionC = Other lossesB1 = Earth BuldgeF = Fresnel ZoneOH = Overhead ObstructionEa= Height of Site AEb= Height of Site Bd1= Dist. From site A to Obstructiond2= Dist. From site B to ObstructionD = Path Distancef= FrequencyK= 4/3Monday, June 03, 2013www.tempustelcosys.comd1 d2Ea Ep Eb
1. Always try Repeater Location should be near to any Townor Road side.2. Repeater Location should be Reachable.3. The Land shouldn’t be disputed or government land.4. The Electricity should be available at or near toRepeater side.5. The Repeater should be planned in such a way so thatin future that side converted to BTS side for revenue.6. It best to planned repeaters on SOI maps first beforestart searching the repeater location on field.Monday, June 03, 2013www.tempustelcosys.com