I kind of wondered if it didn't have something to do with moving
the resonant frequency on 10m up about 1 mHz. My Telrex Balun
was junk and I didn't reconstruct an exact replacement, so it's
great for Dxing on channel 19 but not at 28.5mHz where I need it.
15 and 20m are just fine with 8 turns of RG-213, but no amount of
fine tuning element lengths has ever helped 10m. I don't believe
that it was sold with the resonant frequency screwed up, and that
is the only thing not factory on my antenna. (Except for some
new galvanized hardware) Seems a lot of folks have that same
trouble with 10m on this antenna. I think it's happened after
replacing that Telrex Balun.
I had intended to simply replace it with a new Force 12, but work
has really been stressful and it's not gotten done. I like how
the antenna works on 15 and 20m, but it sure is heavy.
Good Luck
Greg K9ZM
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