Hello all...
My name is Gary... call K9RX.
I’m modeling a 6 element 15 meter beam and wonder how close the model is to
real world performance? Has anyone on here modeled, then built and range tested
a model to confirm the model was accurate? Or if, after having done this, found
it to not be accurate then have a ‘plan’ on how to correct it to be accurate? A
45’ boom 100#+ antenna isn’t something I’d want to take up and down multiple
times nor would I want to mess with trying to confirm say the FB (the SWR of
course is much easier) ... I’d not be looking to get exact results – more rough
magnitude and most importantly the curve itself in relation to the frequency.
also I’m now trying to figure out how to account for the balun leads (it will
be a hairpin) ... any suggestions would be appreciated. Write direct to not
clutter the group...
finally when I model the hairpin from the typical ~22 ohms Rra as a load I get
an inductance required of around 0.31 uH. I get that using both EZNEC6+ and YW.
When I then try to calculate the length of the hairpin I come up with ~ 10”...
and YW comes up with the same value. But the original antenna this started as
has a hairpin (same spacing/dia) of 20”! I’m trying to figure out which one is
right. Thoughts?
I have this model if any one is interested in it. Its been optimized to stack
very well. I’ve taken into account the swagged elements as well as the clamps.
Gary
K9RX
K9RX at ARRL dot net
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