Roof Top Site Survey
Few steps involved in this process and they are listed below.
Due to nearby buildings some areas may not get covered. When signals gone through a wall 10 dB loss will be there. And we also note down possible locations to put our site and cabin of the site.
· Near Field and Far Field obstruction
In order to connect the site to the transmission network, there should be Line of Sight (LOS) between the existing sites and the proposed new site location. During the site survey we should check for the obstructions in both near field and far field.
· Access path
This is important in future maintenance. If there is a proper access path, it will make maintenance Engineers job easier.
· Power
Whether commercial power is available or not.
150-200 m clearance from high tension line
Obstruction from the same building
If this equation H > D/2 satisfied it is acceptable. Otherwise main lobe will be obstructed
from the same building.
· Then reference photographs of the site location are taken, these photographs will include:
*Visibility of the area from the site location (including panoramic photographs)
*Measured land area for the proposed site location
*Accessibility/Access path to the site location
*Availability of the Commercial power
*Terrain conditions of the land
*Neighboring buildings
· Detailed sketch of the location is drawn
This sketch should include: Geo-graphical north referring to the drawing, Access to the site location, proposed sit location of the selected land, landmarks (nearby buildings, houses, power lines, trees).
Deviations in a sharing site
In addition to the normal site survey process, in this process the BTS cabins are planned to install in other operator‟s site location premises. Therefore a suitable location with required dimensions (i.e. 16 ft X 12 ft) is measured. In selecting a cabin location we have to consider the distance from the existing site, cable ladder of the existing site etc.
Green Field Site Survey
Majority of Green field sites are set up in rural areas. There are few deviations from the above mentioned Site Survey process exists when we consider a GF site. And they are: need to conduct a soil test, and availability of commercial power. Also we have to consider the terrain condition. Other things are same as the roof top site survey.
Technical Site Survey (TSS) Form
After completing the surveying process, TSS form was prepared for each new site. And this form is then handed over to the PROJECTS section to proceed with the project. TSS form should include the following details.
· General Data of the site (Site name, Site Identification Code (SIC), etc.)
· Geo-coordinates of the site location
· For Roof Top sites :
*Height of the building
*Microwave planning data: Azimuths and distance to three nearest microwave points.
· For Green Field site :
*Tower type : self-support / COW
*Tower height : 60 m/ 45 m/ 30 m
· Location planning data : coverage objective, coverage area and distances to adjacent sites
· BTS antenna related data;
*Antenna model e.g. 90 Dual Band
*Installation height of the antenna
*Antenna azimuths
*Mechanical and electrical tilt
· Clearance to the nearest high tension line
· Terrain condition (for Green Field sites)
· Power availability
· Column/beam under pole location (for Roof Top sites)
· Site location marked on a map
