[TowerTalk] Tower and Ladder Line Interaction

[Edwin Karl]

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,
>