Microwave/MW Survey

MW SURVEY: 

MW survey is carried out to have MW connectivity between the two sites to ascertain the Line of Sight clearance§The MW LOS survey is carried out physically checking the terrain between the hop & selecting the sites for acquisition§ The survey is critical in nature because any failure in LOS can cost heavy loss on account of providing infrastructure at the site and delay in project.§  Types of MW LOS survey          a) Access MW Survey- Normally for City sites
          b) Backbone MW Survey- For Highway sites 

RF site survey is carried out in the following steps: 

§Collect list of Nominal’s to be surveyed, from the customer§ In case of new town surveys where Nominal’s are not provided, survey the town and provide a nominal for suitable site location§ Use the survey report template forwarded by the customer§Identify physical location of the proposed nominal and locate 3 candidates (maximum) for each nominal, as per search ring size suggested by the customer§Survey the site for RF suitability§Record Latitude and Longitude, building height etc. of the proposed candidates§Estimate and provide required GSM Antenna heights and orientation, proposed tower / pole location (s) will also be marked on a rough sketch of the building (rooftop) or ground site (for each candidate) 

EARTH BULGE:§Earth bulge describes the effect of physical earth curvature along a direct path between two points on the earth's surface§The earth surface appears to "bulge upwards" in the path, with the peak of the bulge occurring at mid-path§This assumes that the earth's surface is flat, with no topological variation along the path between the two points§In radio path profiling, the effects of physical "earth bulge" must be added to the terrain topology (earth surface variation) profile 

§EB=d1*d2/12.7*K,     Here K=Clearance Factor =1.33 

§The amount of physical "earth bulge" along a path can be calculated from the following formula§Where, h = Vertical distance from a horizontal reference line in feet§d1 = Distance from the data point to point A in miles
§d2 = Distance from the data point to point B in miles§MW(Micro wave ) survey is carried out to have MW connectivity between the two sites to ascertain the Line of Sight clearance

§The MW LOS survey is carried out physically checking the MW survey is carried out to have MW connectivity between the two sites to ascertain the Line of Sight clearance§The MW LOS survey is carried out physically checking the terrain between the hop & selecting the sites for acquisition§The survey is critical in nature because any failure in LOS can cost heavy loss on account of providing infrastructure at the site and delay in project

        .§Types of MW LOS survey-            

  a)Access MW Survey- Normally for City sites              

  b)Backbone MW Survey- For Highway  sites

§Tools used- 

 GPS--For Checking Lat/long          

           Binocular           
           Magnetic Compass—For Checking  Orientation/Angle/Azimuth     
           Altimeter  --For AMSL Checking          
           Camera              
           Measuring Tape             
           VSWR Meter