Ground Wave Field Intensities Including Ground Wave Field Intensities within the Line of Sight

摘要

This report was prepared to show in a graphical from the expected ground-wave field intensities for vertical polarization for frequenoies from l to 300 megacyoles per second. The field intensities for elevated antennas within certain distance limitations are obtained by multiplying values obtained for antennas located at the ground by height gain factors. These ground-wave field intensities are based mainly on theoretical calculations for transmission over smooth spherical earth.nThe curves of this report are applicable over a wide range of distances for frequencies from .1 to 300 megacycles, provided the antenna heights are not too great. Ground-wave field intensities are given within the line of sight for antennas of low electrical heights.nThe ground-wave curves of this report are drawn for average atmospheric conditions. The curves are based on standard atmosphere in which the index of refraction decreases linearly with height at rate of .039 X 10-6 per mater.