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A METHOD OF TRANSMITTING A SIGNAL OF STANDARD FREQUENCY AND PHASE TO DISTANT POINTS
FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO
A method is proposed for transmitting radio signals which makes it possible to decrease considerably by at least an order the dependence of the phase on the propagation conditions. Frequency signals are transmitted from two neighboring points located at a distance comparable with half the wavelength. At one of the points the signal frequency and phase are tuned according to the standard-frequency signal by varying the frequency and phase of the signals being emitted. At the reception point a differencefrequency signal is separated and is used as the standard-frequency signal. The frequencies of both signals being transmitted are chosen sufficiently close together while propagating, both signals traverse practically the same distance therefore the phase of the difference signal depends to a considerably lesser extent on the propagation conditions. At the receiving end an additional phase shift is introduced to take into account the distance from the transmitter to the receiver and the parameters of the system. Author