Topband: Topband Digest, Vol 166, Issue 18

[kl7ky]

Art,I use butyl tape. I put a few wraps of electrical tape, then butyl, then electrical tape over the top of that.I have never had a failure using this combo, survives Alaskan winters and the rainy season.KevinKL7KY ex NL7Z 





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-------- Original message --------
From: topband-request at contesting.com 
Date: 10/20/16  08:00  (GMT-09:00) 
To: topband at contesting.com 
Subject: Topband Digest, Vol 166, Issue 18 

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Today's Topics:

   1. xxx (Dave Heil)
   2. Re: inv. L (Art Snapper)
   3. Fwd: Re:  inv. L ( K1FZ-Bruce )
   4. Re: Fwd: Re:  inv. L (Ronald Gorski)


----------------------------------------------------------------------

Message: 1
Date: Thu, 20 Oct 2016 04:51:20 +0000
From: Dave Heil <k8mn at frontiernet.net>
To: Ken Scheper <kenshep at one.net>, topband at contesting.com
Subject: Topband: xxx
Message-ID: <ed1206f5-5254-f923-0e2c-f699d4b0842d at frontiernet.net>
Content-Type: text/plain; charset=utf-8; format=flowed




------------------------------

Message: 2
Date: Thu, 20 Oct 2016 09:16:08 -0400
From: Art Snapper <art at nk8x.net>
To: 160 <topband at contesting.com>
Subject: Re: Topband: inv. L
Message-ID:
	<CAH6Jzy=M+Wb6F6tTD3y0qE3_BvWGWdrnN+-j7J2e5fV2mXMyEg at mail.gmail.com>
Content-Type: text/plain; charset=UTF-8

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

?

On Mon, Oct 17, 2016 at 11:16 AM, Art Snapper <art at nk8x.net> 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
> _________________
> Topband Reflector Archives - http://www.contesting.com/_topband
>


------------------------------

Message: 3
Date: Thu, 20 Oct 2016 09:53:17 -0400
From: " K1FZ-Bruce " <k1fz at myfairpoint.net>
To: Topband <topband at contesting.com>
Subject: Topband: Fwd: Re:  inv. L
Message-ID: <20161020095317.93cyi67q8gww8sks at webmail.myfairpoint.net>
Content-Type: text/plain;	charset=UTF-8



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

?

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
> _________________
> Topband Reflector Archives - http://www.contesting.com/_topband
>
_________________



------------------------------

Message: 4
Date: Thu, 20 Oct 2016 13:59:46 +0000
From: Ronald Gorski <R.Gorski at Astronautics.com>
To: "k1fz at myfairpoint.net" <k1fz at myfairpoint.net>, Topband
	<topband at contesting.com>
Subject: Re: Topband: Fwd: Re:  inv. L
Message-ID:
	<9f4ed140e4ab4b9d88dd11e19f46d873 at HQ-EX2013A.aca.astronautics.com>
Content-Type: text/plain; charset="utf-8"

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

?

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
> _________________
> Topband Reflector Archives - http://www.contesting.com/_topband
>
_________________

_________________
Topband Reflector Archives - http://www.contesting.com/_topband

------------------------------

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End of Topband Digest, Vol 166, Issue 18
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