Note on a radio method of estimating the height of the conducting layer

Abstract

The method presented below has developed out of a discussion of a method which has been thought of and tried out to some extent by Professor W.F.G. Swann and Dr. J.G. Frayne at the University of Minnesota. The idea used by Swann and Frayne was to interrupt the continuous waves of a transmitting station and to interrupt the action of a receiving set in such a way as to have the receiver out of adjustment when the station is sending and to have it in adjustment when the station is not sending. With a suitable frequency of interruption the waves were expected to be received from the layer by the receiver when it was in adjustment even though there should be no waves directly from the transmitter. These experiments have not been carried to completion.