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Re: Topband: New Subject: 160M array feedline question

To: topband@contesting.com
Subject: Re: Topband: New Subject: 160M array feedline question
From: Wes <wes_n7ws@triconet.org>
Date: Mon, 22 Mar 2021 06:36:55 -0700
List-post: <mailto:topband@contesting.com>
What's the perceived problem with the cable being submerged?

Wes  N7WS

On 3/21/2021 1:25 PM, Carl Braun wrote:
Hello Topbanders

I am currently awaiting the snow to melt here in the Northwoods of Wisconsin before starting 
the construction of my low band vertical array.  My verticals will be mounted in a low ground 
area near a lake and the area tends to get wet and sometimes floods in the early spring.  
Water levels could reach 6" to 12" above ground.  My concerns relate to the hardline 
coaxial cable that will run from my lighting arrestor panel at the outside of my shack to the 
center of the two element vertical array which is 250' away.  I will be using 1 5/8" 
hardline that I was able to snag for a very good deal but am concerned about having the cable 
lying on the ground and possible become submerged should we get significant rain with the snow 
melt.

My plan is to elevate the feedline approximately 24" above the ground using old sections 
of Rohn 25 tower spaced every 10' or so.  Each vertically mounted 5' chunk of Rohn 25 will be 
buried 2' into the ground have a 3' 2x6 board laying horizontally across the tower that would 
act as a coaxial "shelf" that will keep the hardline out of the water and prevent 
any significant drooping between these Rohn support sections.

My question for the forum is related to the fact that I will have an elevated 
coaxial feedline with two ground mounted vertical antennas.  I plan to use an 
UNUN or similar line isolator/choke that would keep the hardline from becoming 
a extra radial.  Any thoughts from the forum on this set up? Any extra 
precautions I should take to keep return currents from flowing on the feedline?

Thanks in advance for any suggestions.

Carl W9LF

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