Abstract: A RF transceiver and method of operating a transceiver are provided. The transceiver has a frequency synthesizer that generates a stable, operational frequency signal, a reference VCO that provides a reference frequency for use in operation of the synthesizer, a voltage source coupled to the reference VCO that produces a control voltage that controls an output frequency of the reference VCO, and a controller coupled to the voltage source that controls the voltage applied by the voltage source. The controller compares a value of a known frequency of a RF signal received by the transceiver with a value of a current receiver frequency to estimate an error of the current receiver frequency, calculates, using the estimated error, a change needed to the control voltage to change the reference frequency to eliminate the estimated error, and controls the voltage source to apply the calculated change to the control voltage.