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of less than 195m AMSL should not be in Trimingham’s LoS, so the shortest turbine tip height used for this Pd analysis was 195m AMSL. The 260m and 280m turbines were included to give greater context but since they exceed the East Anglia THREE turbine Rochdale Envelope, results at these heights are not recorded in this Appendix.


46.


The path loss from the radar to the turbine tips from the Trimingham radar was calculated using the ITU526 propagation model.


Simulated Turbine MOD Trimingham Radar


Diagram 9 Example path loss calculation to tip of 195m turbine. 47.


The results are tabulated at table 2. For each example turbine height, the free space path loss to the turbine location is shown together with the calculated actual path loss to the turbine tip and to points 20m below and above the turbine tip height.


Path loss Calculations Turbine Height


Equivalent Free Space path loss


(dB)


195m 204m 220m 244m


-133.8 -133.9 -134.0 -134.2


Table 2


-156.1 -156.3 -156.3 -156.6


Path loss to turbine tip


(dB)


(dB) -244 -238 -232 -208


Path loss Calculations (dB)


-152.6 -152.9 -153.0 -153.3


Path loss to turbine tip -20m


Path loss to turbine tip +20m


Preliminary Environmental Information May 2014


East Anglia THREE Offshore Windfarm


Appendix 0 Example Page 12


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