An intermediate frequency signal (50) is received by a difference frequency generator (43). The intermediate frequency signal (50) includes a pilot tone frequency. A band pass filter (64) removes frequencies surrounding the pilot tone frequency. A phase lock loop (66) generates a pilot tone signal from the pilot tone frequency. A divisor (74) divides the frequency of the pilot tone signal by a specified number. A second phase detector (76) determines a frequency difference between the pilot tone signal and a stable frequency signal generated by a stable frequency oscillator (78). A control voltage for a difference frequency voltage controlled dielectric resonant oscillator (84) is adjusted based on the frequency difference. A system frequency signal (48) is downconverted to an intermediate frequency signal (50) using a difference frequency signal (54).
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