| 摘要 |
A frequency control apparatus for compensating frequency fluctuation in an input received signal from a satellite station of a satellite communication system, comprises a PLL arrangement for generating a frequency converting signal in response to the frequency fluctuation in the input received signal, a mixer for mixing the input received signal and the frequency converting signal to deliver a resultant output signal, and a control circuit for designating a predetermined signal as the frequency converting signal when the PLL arrangement becomes a phase-unlocked state.
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