On 7/13/19 12:43 PM, Nick Kennedy wrote:
I haven't looked at how it affects "pullability" of the crystals in a VXO
though.
My 2 cents worth on "pullability" of crystals...
My experience is that full size 49 xtals offer a larger freq span than the short stuff.
Another thing...Over many years, I have seen multiple xtals in parallel to increase freq span.
I discovered that placing a small value cap (range 4p7 +/-) at the junction of xtals/series inductor to ground does the same thing.
At least it seems that way. Check out Cx on the left side of this schematic:
73, Diz, W8DIZ
