On 21. Nov 2023, at 02:32, Ed Breya via groups.io <edbreya@...> wrote:
If finding reasonable wet Ta caps is difficult or outrageous, you can do some experiments with Al types, with proper selection and testing, and acceptance of good but not necessarily perfect original performance...
I did a very thorough selection before choosing the cap with the best dimensions ;-)
Do you know the magnitude of currents going into the YTO's coil? Since the capacitor is in parallel to the coil, the voltage-to-current converter is unable to see and correct for its leakage. As a consequence: higher CW frequency -> higher current -> higher voltage -> higher leakage -> higher shift in frequency when I switch CW-filter on and off.
I'll check that today once the unit is stable (takes an hour or two).
cheers
Martin
Martin