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Ken Bessler wrote:
Help? Do I trim or not? I have done some tests with the ant
up and I'm noticing my F/B ratio is not as good as the EZNEC
model predicted (30.62 db predicted, I'm seeing maybe 2-3db)


The Handbook means the self-resonant frequency with no other elements
around. They do NOT mean compared to the size of the driven element.

A driven element can move higher or lower in frequency as you add other
elements, depending on the tuning of the other elements.

I usually do all my F/B tuning first, and then SWR last. By the way, I
HOPE you have a balun at the feedpoint. Without a balun at the
feedpoint, the F/B can be seriously diminished.

73 Tom


I have about 8 turns of coax at the feedpoint. Is that good enough or
do I need a 1:1 balun also?

Thanks for the help!

Ken KG0WX