Abstract: A phase locking oscillator (60, 70, 80, 90, or 110) and a radio frequency oscillator (62, 72, 82, 92, or 112) achieve reduced incidental frequency modulation. A frequency-deviation sensitivity is reduced by a divider (66 or 100) that reduces a frequency-control voltage, thereby decreasing voltage spikes and other electrical noise, and thereby reducing incidental frequency modulation. In embodiments having an AC voltage divider (66), the frequency-control voltage is reduced when a frequency thereof is above a predetermined roll-off frequency. Below the roll-off frequency, the voltage dividing function ceases, and full deviation sensitivity of the radio frequency oscillator (62, 72, or 82) is restored, whereby a capture range of the phase locking oscillator (60, 70, or 80) and a maximum frequency range of the radio frequency oscillator (62, 72, or 82) are restored.