The FMVC31028 from Fairview Microwave is a Voltage Controlled Oscillator with Frequency 4.245 to 4.335 GHz, Power -2 to 3 dBm, Tuning Sensitivity 70 MHz/V, Tuning Voltage 0.5 to 8 V, Pulling 10 MHz. Tags: Module with Connectors. More details for FMVC31028 can be seen below.