Topband: Fwd: Re: inv. L

[Ronald Gorski]

There is a product called "Liquid Tape" that is available from hardware stores and home improvement centers. It has to be applied in layers but aggressively adheres to the coax end. You need to pay special attention covering the braid since water will wick.
Ron N9AU

-----Original Message-----
From: Topband [mailto:topband-bounces at contesting.com] On Behalf Of K1FZ-Bruce
Sent: Thursday, October 20, 2016 8:53 AM
To: Topband
Subject: Topband: Fwd: Re: inv. L



I waterproof with silicon as best possible, and the most important  part is  make an upside down U turn in the coax at the end. Water does not "like" to flow up hill in most cases. 

 
73
Bruce-k1fz

On Thu, 20 Oct 2016 09:16:08 -0400, Art Snapper  wrote:

      I had a few hours free yesterday afternoon, so I began the dual 80/160 radiator inv. L project. 

In the process, I found that water had entered the coaxial center insulator that was used at the feedpoint of the antenna. 

Does anyone have a favorite solution for a weatherproof, coaxial feedpoint for this type of antenna???

The radials are attached to several load center ground bars, that are screwed into a copper pipe that is driven into the ground. 

The pipe gives me a rigid mounting point for some kind of insulator or standoff. 

BTW, after a temporary fix, I ran some quick SWR tests. There appears to be very little interaction between the elements. At least from an SWR perspective. 

de Art NK8X

ᐧ

On Mon, Oct 17, 2016 at 11:16 AM, Art Snapper  wrote:

> I was considering adding a second vertical element to my 160 inverted L. 
> This one would be roughly a quarter wave tall for use on 80. 
>
> I tried modelling in Eznec, but wasn't comfortable with the results. I 
> may have screwed it up.
>
> Has anyone tried it for real? Is it a big compromise on either band? 
> Would a switch at the feedpoint have any benefit?
>
> My inverted L has about 50 radials. 
>
> 73
> Art NK8X
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