We discuss the results of an intercomparison for electric field strength measurements within the DKD. The comparison has been carried out on the field strength value required to reach a display reading of 20 V m⁻¹ of the field probes. While the results agree well for the small field probe and when the larger commercial 3-axis field probe is oriented in the direction of the magnetic field, larger deviations occur, when the larger 3-axis field probe is oriented into the direction propagation.

In this paper we discuss the results of an intercomparison for free space antenna factor measurements. Three different types of antennas covering the frequency range from 30 MHz to 26.5 GHz have been calibrated in five different laboratories using different methods and calibration sites. The results agree well within the uncertainties specified by the laboratories suggesting that different approaches and different measurement sites to obtain the free space antenna factor are well compatible.

With the availability of unmanned aerial systems (UAS) such as octocopters a new versatile platform for signal-in-space measurements is deployable. This paper describes concept and design of an octocopter and its instrumentation, being used to investigate the possible interaction of terrestrial navigation systems such as DVORs and radars with single wind turbines (WT) or wind power plants.