Hans provides a circuit to measure its varying capacitance. Of course you can also install candidate diodes into your vfo that may be easier.?
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I realize in the old days folk sought a huge range. But note the venerable nc20 used a variable cap in parallel to expand the range. Or switching in a fixed cap. I am confident Doug has seen all these approaches.?
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My all time favorite may be the vcxo in the 38S.?
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Curt
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