Posted by
Ron D'Eau Claire-2 on
Dec 09, 2006; 11:23pm
URL: http://elecraft.85.s1.nabble.com/sideways-V-antenna-tp441762p441765.html
I've used a center fed antenna like that with good results. The same rule
apples as applies to an Inverted V: keep the angle >90 degrees to avoid
excessive signal cancellation.
Feeding it off center means your "feed line" is not just a transmission
line: it's another radiating element in the antenna. Since the load is
unbalanced, the currents will be unbalanced, no matter what you do at the
rig end with baluns, etc. So be sure your feedline runs as short a distance
as practical near the house, through walls, etc.
You didn't say how long it'll be, but at frequencies where the legs get to
be a couple of wavelengths long or more it'll start to show directivity in
the direction of the open angle of the V.
Ron AC7AC
-----Original Message-----
Fellow Elecrafters,
There's lots of stuff in the antenna literature about inverted V antennas,
i.e., where the feedpoint is higher than the ends. But I can't find anything
on dipoles and such in which the ends are not in the same vertical plane as
the center.
I'm thinking of putting up a stealth antenna that would be an OCF dipole
with the feedpoint at the peak of my roof, and the ends extending toward two
trees alongside the house. I've taken some measurements and calculated the
angle between the legs as being about 97 degrees - but of course in the
horizontal plane, not the vertical plane like an inverted V. I'd feed it
with ladder line and my good ole Johnson Viking Matchbox, so I'm not worried
about effects on feedpoint impedance. I imagine it would exhibit some
directionality, probably toward the open side of the V ?
Anyone see any major pitfalls with this approach??
73
Ray K2HYD
KX-1 # 608
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