[TowerTalk] vertical antennas and trees
kr2q at optimum.net
kr2q at optimum.net
Wed Dec 28 14:40:32 PST 2011
Wow...I never would have believed that so much could be generated from a simple post. :-)
First, I would like to remind some of the readers that in MY situation, the vertical (wire)
element is very, very close to the tree trunk. At most, it is 6 inches away. Near the top and
bottom, probably more like 1 or 2 inches. FYI...for me (non engineer) this is a LOT different than
"replacing" an aluminum reflector with a "branch" reflector. Considering the ratio of
diameters and mass (# 14 wire to 12" to 18" dia tree trunk), things are "very different" than
some of the suggested scenarios.
Second. Considering the inverse square law, I will attempt to duplicate the GP I have up
now on 40m, which is "right next to the tree trunk" with a 2nd GP which is in the middle of my
backyard (away from trees by at least 20 feet in all directions). In my "simple approach,"
if there is a noticeable difference A/B, then "extreme proximity to the tree" is likely a
major factor.
One concern I have is the impact of the already existing GP on the "new one." Any
suggestions on "how far apart" I should keep them in order to minimize possible
interaction? I don't have a big yard in terms of "area without trees," so I'll do the best
that I can. It is likely that the elevated radials will have to overlap (but not touch).
I think this will be a fun (and hopefully informative) study.
RSVP with any suggestions, comments, critiques, or whatever.
Thanks,
de Doug KR2Q
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