I have heard we have several modelling experts out there. I have purchased
both EZNEC+ and AutoEZ and adapted a 20-15-10m Triband design for separate
feedlines. I am matching the impedance with shunt coils across the driven
elements. I built the coils using a coil calculator then tweaked them to
the correct value with my Rig Expert analyzer. I didn't get anywhere near
the expected result of the model with the real antenna.
I modeled the shunt coils as R+jX loads connected in parallel to the center
of each driven element, but am guessing that wasn't the right way to go? Is
anyone able to point me in the right direction? I am trying to get this
Yagi ready to go for the CQWW WPX contest at the end of this month.
If you reply to me off list,I will send the AutoEZ/NEC file I built for the
model.
--
Thank you!
David Needham, AA4VT (formerly K4AJA and K8AJA)
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