On 12/29/2011 8:40 PM, David Jordan wrote:
> I've been lectured to that just putting up an antenna and trying it out is
> not a good practice... one should first read and learn learn learn.
You have not been lectured by me -- you posted a thoughtful analysis of
your experience in your particular conditions, and you seem to have kept
your mind open to learn new stuff. That's exactly how I started this
thread several days ago, and I think those who have approached it from
the same perspective have learned from it. I have. And an important
part of learning about this particular topic is understanding the
difference between one set of conditions and those of others who make
observations. Further, Jim Lux did some serious research that gave him
some numbers to work with for might be going on in a tree, and a lot of
trees, and built an NEC model using what he had learned. His work
appears to have answered one of the most important questions I asked in
that initial post -- does a single tree cause significant loss if the
antenna is running right next to the trunk.
Another point. The purpose of all of this exchange of experience in a
thoughtful way, thinking and analysis, and studying the textbooks, is to
give us more to go on when we're trying to figure out which kind of
practical antenna is likely to work best for us (and even to provide
more information for those textbooks). I don't think that any
thoughtful person would say that you should not use a vertical in a
dense forest if that was all you could do, or if that was best that you
could do..But it's certainly useful to know that it doesn't matter in a
forest that's not very dense, that sticking it right next to the trunk
of a big a tree should work fine, and that a good high horizontal dipole
will work a lot better -- IF you can rig it.
73, Jim K9YC.
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