Hi DL2EBZ,
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There is certainly a very limited range on the "stock" variable pulling capacitor in the oscillator circuit.
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If you run out of range, you can add or remove capacitance by changing values of the fixed parallel capacitors. Be sure to use high quality NG0/C0G capacitors if you do this. This can allow you to continue to "calibrate" your rig without replacing the crystal.
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-Mat Breton, N8TW
Mat Breton N8TW