Radiotelegraphy and Radiotelephony on Half-Meter Waves

Communication tests in radiotelegraphy and radiotelephony on half-meter waves are described. The first section of the paper is devoted to the description of a new type of receiver for 40-80-cm waves. Experimental results are given to show the action of this receiver. It is pointed out that a sort of regenerative amplifying accompanies the detection of such extremely short waves, and a brief explanation of this action is given. The next section of the paper contains the results of experiments on a half-meter transmitter, with special regard to the modulation system. In the latter portion of the paper, actual tests of communication to the distance from 10 to 30 km are described. The possible application of our wave collecting system to direction finding with such extremely short waves is pointed out.