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Two Yig-tuned Gunn oscillators1 have been frequency locked over a 3-GHz range in X-band. Injected power into the locked oscillator was approximately 10 dB below its output power. Analog frequency-tracking circuitry was used together with phase-comparator feedback to achieve output phase which remained within ±10° over a 1.2 GHz bandwidth. Controlled phase shifting was obtained by applying dc voltages within the feedback loop.