[TowerTalk] 80 meter antenna comparison
RadioIR at charter.net
Wed Jan 30 16:49:47 EST 2008
...."Interesting.... however using EZNEC and their provided 4 SQ model
I see different results then what your suggesting here... a DIPOLE at
136' (what I have) out performs a 4 SQ for all angles down to about 4
degrees! And not by a small amount. Possibly their model is not correct?
or I am not using it properly. "......
The model included with EZNEC contains no wire losses, no transmission
line losses, and no near field ground losses, and assumes average flat
>Interesting.... however using EZNEC and their provided 4 SQ
>model I see different results
>then what your suggesting here... a DIPOLE at 136' (what I have)
>out performs a 4 SQ for
>all angles down to about 4 degrees! And not by a small amount.
>Possibly their model is not
>correct? or I am not using it properly. In practice this is what
>I have found - the dipole keeps
>up with 4 sq's often. It's only on LP and very long stuff that
>the 4 sq tends to be better....
>this of course is hard to asset as we're talking vastly
>different distances on these
>comparisons (not all done here or locally) .... thus my question
>to the group for someone
>that has done it themselves.
>I would agree that if you had the yagi up higher - say 45M you
>would see better performance.
>However I would be careful about going any higher than this as,
>as I am sure you know,
> that lobe at 90 really starts to grow rapidly... wasted energy.
>The conclusion seems to be heavily waited towards the 4 SQ
>end... somewhat biased by the
>human nature feeling: it's good because I can't have the other
>(a yagi)... those that have a
>yagi often seem to suggest it IS the way to go... real estate is
>not something I have a great
>deal of here (4A with the current tower centered so not a whole
>lot of room left for
>anything :>). Having both however would be nice....hmmmmm....
>but I believe most have to agree: having a 2el 80 meter yagi
>- that monster up there - is (would be) a real grinner!
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