A Method of Calculation of Field Strengths in High-Frequency Radio Transmission

The theory on the transmission of high-frequency radio waves developed by one of the authors in a previous paper is applied to practical problems, and a systematic method of calculating the field strengths of high-frequency waves is established. The property of the ionization chart is explained and the method of construction of the chart is given. Practical examples of calculations are shown with respect to Tokio-Cape Town and Tokio-Melbourne circuits. The present method is most useful not only for the projection of a new high-frequency communication route, but also for the investigations of high-frequency transmission phenomena. From a number of measurements made on high-frequency transmission, it is shown that the coefficient of recombination in the F layer is about 1.5 × 10^-10[sec^-1] this value being in fairly good coincidence with the theoretical value.