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A voltage controlled oscillator using a SAW resonator does not need multiplication and tuning in the 100 MHz ‐ UHF band so that miniaturization and circuit simplification can be achieved. It also has the feature that less power is dissipated than with a SAW delay line. In this paper the SAW resonator voltage‐controlled oscillator (SAWR‐VCO) is used as a modulator suitable for a phase locked loop (PLL) and its modulation sensitivity and distortion are analyzed. Tests confirm the analysis of SAWR‐VCO performance. Finally a PLL modulator structure and the modulator circuit for use in an automotive mobile telephone unit is described.