4 LOFAR core and environment Large receiving surfaceShort baselinesSusceptible to interferenceRadio quiet zone coordination zone of ~ 6 kmWind turbines!
5 Wind turbines in Drenthe Up to 200 MW in 2020At least 3 MW per wind turbineClusters of at least 5 wind turbinesNo wind turbines in LOFAR zone 1 (radio quiet zone)Only wind turbines in LOFAR zone 2 (coordination zone) if they do not impede the LOFAR project
6 Windfarm ‘Hondtocht’ LOFAR monitoring survey in October 2006 Local authority: Dronten (Flevoland)Wind turbine: Vestas - V66 - 1,75 MWNumber of wind turbines: 8Installed capacity: 14,75 MWRotor axis height: 67 metresRotor diameter: 66 metresMeasurements by: Mark Bentum and Harm-Jan StiepelProcessing by: Rob Millenaar and Albert-Jan Boonstra
15 Conclusions Electronics is potential source of emission Partly shielded by wind turbine structureMight be different for other wind turbinesAmplitude modulation due to variable reflectionsFor LOFAR frequencies AM on already distorted channels due to dispersionMore investigations needed:Emission and reflections of bigger wind turbines and other typesDispersion and reflections at higher frequencies
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