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Abstract

A circuit for automatically substituting a reference oscillator for synchronizing two transmitter co-channel local oscillators. The circuit includes a first bias switching device for switching a first power supply to a first reference oscillator and a second bias switching device for switching a second power supply to a second reference oscillator. The first and second reference oscillators generate first and second reference signals for synchronizing the oscillator frequencies. A first divider firstly and secondly divides and outputs the power of the first reference signal. A second divider firstly and secondly divides and outputs the power of the second reference signal. A first combining device inputs the power of the firstly-divided first reference signal and the secondly-divided second reference signal and outputs the power to the phase locked dielectric resonator oscillator for the vertical polarization wave. A second combining device inputs the power of the firstly-divided second reference signal and the secondly-divided first reference signal and outputs the power to the phase locked dielectric resonator oscillator for the horizontal polarization wave. A first switching control switches the second bias switching device in response to generation of the first reference signal secondly-divided in the first divider. A second switching control switches the first bias switching device in response to generation of the second reference signal secondly-divided in the second divider.

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