Hi Carl,
As you've already discovered, the caps have just the two
connections.? The right side is the rotor connected to ground.?
The small lead on the left connects the stator to the xtal.? Three
of mine failed with the solder bridge connecting the rotor screw
to the rotor plate breaking loose, rendering them useless.? I was
not successful in reheating the solder.
I'm presently experimenting with using the inexpensive plastic
trimmers to replace the ceramic ones.? They are available on
Amazon, Ebay, etc.? Each one needs to be verified with a capacitor
tester.?
Do you have an RF probe connected to the RF board test port so you
can monitor the oscillator signal level?
Good luck and keep us updated on your progress!
Richard kn7saf
On 4/15/2023 10:41 AM, Carl wrote:
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Thanks Tony, this is what I suspected. I’ve ordered one off
eBay so fingers crossed it’s a working one and it solves the
problem. TC18 also shattered when I was attempting to tune the
crystal (symptoms were already present) so I’ve ordered a used
board to swap that out. Does anyone know of a good new
replacement? I see plenty of ceramic Chinese trimmers but all of
them seem to be two leg instead of 3. Or does that not matter???
