Kelley;
I have 450 ohm ladder line about 18 inches from the tower. It feeds an
80 meter
inverted Vee centered at 80 feet. I twist the line say 12 times from top
to bottom
to equalize any interaction with the tower metal. I'm not sure it this
is really necessary
at HF but I learned to do that with 300 ohm twin lead eons ago
installing TV antennas.
I have this up now for 6 or more years, works great. Use a ladder lock
for center insulator,
and a pulley at the top so I can lower to the ground to work on it. Enjoy!
73!
ed K0KL
On 7/23/2014 10:06 AM, Kelley wrote:
I have a Rohn HDBX 48 with a tribander at the top. I don't have much
in the way of lower band antennas. I was thinking of adding an
inverted V, with the apex at the top of the tower, fed with ladder
line to a remote tuner near the bottom of the tower.
However, I'm concerned about the interaction between the tower and the
ladder line. Some of the info I've read suggests it's not that big of
a deal as long as the ladder line is a few inches from the metal.
Other info I've read suggests otherwise.
I there a "minimum safe distance" between a tower and ladder line? Or,
is running ladder line parallel to a metal tower just a bad thing at
any distance? Anyone have any experience with this?
Thanks,
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