OK, maybe if I just attach the file rather than trying to embed it?
A while back, someone asked how to use the EFC on a 10811 to allow
fine frequency adjustment without spoiling the inherent stability of
the oscillator. I finally found a copy of the schematic for the
circuit I have used with
You need to understand that there is a +6.2V Zener diode reference
connected to the cathode of the varactor. If you really want to
minimize any perturbations of the oscillator by the tuning diode,
you should operate up near +5V, so that the voltage across
the varactor is minimized. Also, ideally,
