Report on Experiments with Electric Waves of about 3 Meters: Their Propagation and Use

After means became available for generating sufficient power at wavelengths of about 3 meters, and with the development of suitable methods of reception, experiments were carried out with regard to the character of propagation of these waves. Directive devices, in the form of parabolic reflectors, were also used successfully. Some preliminary experiments upon the maximum range were first made by the Technical-Physical Institute at Jena, and following these, similar experiments were made from Herzogstand jointly by the Institute and the Bavarian Postal authorities. Later more thorough experiments were conducted by the laboratories of the C. Lorenz Aktiengesellschaft, Berlin, in co-operation with the Jena Institute, from airplanes and from the top of the Brocken (1142 meters above sea-level). These experiments are described and brief explanations are given concerning the apparatus and methods used in each case. The results have clarified the phenomena of propagation of these wavelengths and indicate the possibility of their practical application as a means of signaling over short ranges, and, particularly as a means for transmitting signals in a fog for marine and aerial navigation, and as a possible means for transmission of television in the future.