Binary PSK Transmission Using Two Closely Related Frequencies to Eliminate Phase Discontinuity.
OFFICE OF THE SECRETARY OF THE ARMY WASHINGTON D C
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The patent describes a binary transmission system which includes an oscillator for generating an RF signal at a first frequency and a binary information generator for generating information at a second frequency under the control of a clock operating at the second frequency. The clock signal frequency is divided in half by a flip-flop and balanced modulated with the oscillator RF signal, and then fed to a band-pass filter tuned to one of the side bands to establish a third frequency. The difference between the first and third frequencies is one-half the clock rate. A pair of phase splitters provide phase-reversed outputs of the signals at the first and third frequencies. A logic circuit controlled by the binary information generator selectively switches these phase-reversed signals to an antenna for transmission. Switching is accomplished such that the phase of the successively applied signals are phase matched at the time of switching.
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