[Antennas] Optimal longwire for QRP

2002年5月11日 19:44:08 -0700 (PDT)

I've just gotten a K-1(with a tuner), and want to put
up a longwire. I've been using an HW-7, with a 90' 14
ga. stranded wire that goes out the shack window, up
and into the attic, and around the inside of the roof,
and a tuner. With the 2 watts and primitive receiver,
I worked a bunch of DX up to about 8000 mi, getting
559s. Now I'd like to see what happens with a longer
wire, higher and outside. Here are the questions:
Since I need to balance invisibility, or nearly so,
(for the XYL) with breakage resistance, I'd like to
use a smallish gauge wire, and I'd like some input on
wire sizing. I'll use insulated wire to reduce the
effects of chafing. I'm going to toss it up 30-40'
into a tree next to the window, then across to another
tree... I've got some land, and the second tree is the
beginning of the woods, so I could theoretically run
the wire from tree to tree to tree...How long is best?
Should I expect more gain with more length? Should I
be concerned with the exact length, to avoid multiples
or fractions of resonant frequencies? Any ideas about
a good way to terminate the wire that would be secure,
but allow for movement of the trees in the wind?
Thanks!
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