The VCO3543 from Dynamic Engineers is a Voltage Controlled Oscillator with Frequency 1.19 to 1.36 GHz, Power 1.77 mW, Tuning Sensitivity 72 MHz/V, Tuning Voltage 1 to 4 V, Pulling 4 MHz/V. Tags: Surface Mount. More details for VCO3543 can be seen below.