In a digital microwave system for a common channel, a transmitter local oscillator frequency synchronization circuit

摘要

1. The technical field to which the invention described in the claims belongs; Local oscillator frequency synchronization circuit in digital microwave system for common channel.;2. Technical Problems to be Solved by the Invention; A local oscillator frequency for synchronizing the phase-locked dielectric resonance oscillators for vertical polarization and horizontal polarization simultaneously by processing the output signal of one of the reference oscillators of the vertical polarization and the horizontal polarization and automatically switching the oscillator to the opposite oscillator when the reference oscillator in operation fails; And provides a synchronous circuit.;3. The gist of the solution of the invention; The bias switch for supplying the power to the reference oscillator is switched ON and ON only one of the vertically polarized wave and the horizontally polarized wave is operated and the output signal of the vertically polarized wave and the horizontally polarized wave is divided into power, And is simultaneously applied to the wave-phase fixed-dielectric resonator oscillator. If one oscillator fails, check it and activate the other bias switch to turn on the other reference oscillator.;4. An important use of the invention; Digital microwave system for common channel.