Radio propagation measurements in the 100 to 118 kmcs spectrum

This paper describes recent radio propagation measurements in the millimeter wavelength region between 100 and 118 kmcs over a 2155 foot path. The attenuation due to atmospheric gases was determined and the contribution from water vapor, oxygen and some rare atmospheric gases was analyzed. The data are explained in terms of an oxygen line at 2.53 mm, having a strength of 1.6 db/km and a line breadth of 0.05 cm^-1, a water vapor line at 110 kmcs with a strength of 0.35 db/km for a standard atmosphere and a line breadth constant of 0.08 cm^-1, and irregular absorption by rare gases such as N2O, NO2, SO2and O3.