| 摘要 |
A method and apparatus for providing an antenna condition signal in a base station having an antenna (210) coupled to a cabinet (202) by an antenna feeder cable (206). Two directional couplers (312, 314) are configured to detect forward and reflected signals to and from the antenna (210). Power detectors (316, 320) are coupled to the RF couplers (312, 314), and are configured to provide forward and reflected power signals. A differential amplifier (318) provides a detector tuning signal proportional to the difference between the forward and reflected power signals. The differential amplifier tunes a voltage controlled oscillator (VCO) (326). The VCO output is coupled to the feeder cable (206). A phase locked loop at the cabinet is coupled to the feeder cable and provides a recovery tuning signal which tracks the detector tuning signal.
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