This VHF VCO circuit is suitable for 30 to 200 MHz. Q1 can be replaced by a 2N3563 for operation above 100 MHz
. LI is chosen to resonate to the desired frequency with the varactor capacitance of 40 pF. Other varactors can be substituted or two back-to-back varactors can be used for better linearity, depending on the application.