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An 840-MHz SAW resonator stabilized oscillator has been developed and is being manufactured for incorporation into a radar system. This stable fundamental-mode frequency source is simple and compact (1 in3 in volume) and delivers a relatively high output power of +25 dBm. These advantageous characteristics are made possible by the high-frequency low-loss distortion-free/linear-phase response of the two-port SAW resonator filter incorporated in the design. Details of the device and circuit design and oscillator performance are presented.