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An extremely low cost and very compact synthesizer - stabilized VCO for automatic toll debiting systems was developed. The RF section of the oscillator consists of a 1450MHz - VCO, a 20dBm buffer amplifier and a frequency quadrupler. This quadrupler is the core part of the system. He consists of a class - C biased bipolar transistor. All matching networks of the RF modules consist of standard SMD components. The complete circuit, therefore, has smaller dimensions.