Replacement for MC12149 (Voltage Controlled Oscillator)
You can use a colpitts oscillator with simple varactor control. Here's one that claims to oscillate at 1 GHz : -



It has a good tuning range too (2.3:1). Just scale components to suit your mid frequency and you should be in business. Note that the VCO control voltage may be a bit excessive but this comes with the territory for this type of control.

As for supply voltage to the main circuit, it's highly likely that this design will work down to below 3V. Here's one that uses a lower control voltage but has less range so, somewhere between the two might be exactly what you are looking for: -



Alternatively just buy one from mini-circuits: -