Radiation Measurements of a Short-Wave Directive Antenna at the Nauen High Power Radio Station

This paper is a report on the experimental investigation of the, raidiation of a short-wave directive antenna at Nauen. Measurements were made on the ground and also in the air, using an airplane. The results, plotted in the form of radiation characteristic curves, were compared with calculated radiation characteristics. In the case of the horizontal radiation characteristic the agreement between measurement and calculation is comparatively good. For the vertical radiation characteristic curves calculations were made for the two limiting cases: a. Nonreflecting earth surface. b. Perfectly reflecting earth surface. The measured vertical characteristic agrees rather well with case b, from which it follows that the surface of the earth, under the conditions prevailing at Nauen, shows a very high reflecting power. This is also confirmed by the fact that the field strength increases very rapidly from 0 at the surface of the earth as the height increases. It is also found that the radiated energy is highly concentrated in the desired direction in the horizontal as well as in the vertical plane.