Some Practical Aspects of Short-Wave Operation at High Power

Propagation data over the frequency range of 3,000 to 30,000 kilocycles is submitted. A co-relation is shown between wave frequency and angle of projection of the wave front. The effect of ionization on the angle of projection is indicated. Some calculations are given of probable values of attenuation constant. The importance of frequency stabilization is discussed. Three typical circuits for utilizing control crystals are described. Features of the design and adjustment of a 20-kw. power amplifier are outlined. Antenna and antenna feed systems are discussed. Graphical results of comparisons of various antenna types are given. The relative importance of static at short wave lengths is considered. The author's anticipation of the destiny of the short wave is summarized.