Non Linear Vac Cap?!

Barry - 2E0IDE


I've just changed out an air cap for a vac cap and was surprised to find, unlike a very linear air cap, the vac cap is anything but linear.:-

My controller was really accurate with the air cap and a 100:1 gearbox. The vac cap has a 5:1 gearbox. At 40M the accuracy is OK but not good at all at 20M and above.

Has anyone else had similar results with a vac cap or can advide where I may be having a senior moment!

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