[Antennas] multiple dipoles \ one feed

2002年7月30日 23:13:50 -0500

Main thing, Ed, is to keep the dipoles spread apart from one another if
possible. Makes it much easier to tune, but also changes the broadside
pattern directions. The usual formula lengths I have found to be on the
short side, so I cut long and then just wrap the wire back on itself to
prune. I would do 40 first, then 20 and 6 last.
I have four dipoles in my attic on 80, 40, 30 and 20 meters all fed with
one RG-213 and a balun at the feedpoint. I usually use a tuner since
pruning four dipoles in a hot or cold attic is not fun at my age and lack
of agility! <:} Yes, they are all full size dipoles and, yes, the 80 meter
one is a bit folded on the ends! Sometimes they outperform the outside
"real" antennas though not often. Still it is convenient to have antennas
that you can use when the outside ones have to be disconnected. 
(I know - indoor antennas can be struck by lightning. Besides the attic is
already full of wire. But with all the outside wire and trees, etc. it
would have to work at it! <:} 
If you like this arrangement and have the room, you can add other dipoles.
And you can use your 40/20/6 setup on 15 but it will probably require a
tuner. Lots of new things to try! 
Good luck.
73/72/oo, George W5YR - the Yellow Rose of Texas 
Fairview, TX 30 mi NE of Dallas in Collin county EM13qe 
Amateur Radio W5YR, in the 56th year and it just keeps getting better!
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