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OT: Ladder Line Spacers

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Ken Kopp-3

OT: Ladder Line Spacers

Comment on a product of interest to many, by an Elecrafter.

http://sites.google.com:80/site/kshamradioparts/home/ladder-line-spacer

73! Ken Kopp - K0PP
[hidden email]

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Steve Ellington

Re: OT: Ladder Line Spacers

Another ladder line trick.
http://www.youtube.com/watch?v=qzFKGB6qkXs

Steve
N4LQ
----- Original Message -----
From: "Ken Kopp" <[hidden email]>
To: <[hidden email]>
Sent: Wednesday, May 12, 2010 7:17 PM
Subject: [Elecraft] OT: Ladder Line Spacers

> Comment on a product of interest to many, by an Elecrafter.
>
> http://sites.google.com:80/site/kshamradioparts/home/ladder-line-spacer
>
> 73! Ken Kopp - K0PP
> [hidden email]
>
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
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> Post: mailto:[hidden email]
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n7ws

Re: OT: Ladder Line Spacers

In reply to this post by Ken Kopp-3

The dissipation factor of Nylon is about two orders of magnitude greater than polyethylene and the UV resistance is horrible.

Wes N7Ws

--- On Wed, 5/12/10, Ken Kopp <[hidden email]> wrote:

From: Ken Kopp <[hidden email]>
Subject: [Elecraft] OT: Ladder Line Spacers
To: [hidden email]
Date: Wednesday, May 12, 2010, 5:17 PM

Comment on a product of interest to many, by an Elecrafter.

http://sites.google.com:80/site/kshamradioparts/home/ladder-line-spacer

73! Ken Kopp - K0PP
[hidden email]

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David Gilbert

Re: OT: Ladder Line Spacers

Agreed. Those little white nylon spacers wouldn't last a year here in
Arizona. Nylon also cold flows under pressure, so any "spreader" force
is going to be a problem over time in less UV-intensive climates. I
don't know why anyone would choose nylon as a material for that application.

73,
Dave AB7E

On 5/12/2010 6:35 PM, Wes Stewart wrote:

> The dissipation factor of Nylon is about two orders of magnitude greater than polyethylene and the UV resistance is horrible.
>
> Wes N7Ws
>
> --- On Wed, 5/12/10, Ken Kopp<[hidden email]> wrote:
>
> From: Ken Kopp<[hidden email]>
> Subject: [Elecraft] OT: Ladder Line Spacers
> To: [hidden email]
> Date: Wednesday, May 12, 2010, 5:17 PM
>
> Comment on a product of interest to many, by an Elecrafter.
>
> http://sites.google.com:80/site/kshamradioparts/home/ladder-line-spacer
>
> 73! Ken Kopp - K0PP
> [hidden email]
>
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
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>
>
>
>
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>

W8JI

Re: OT: Ladder Line Spacers

In reply to this post by n7ws

The dissipation factor of Nylon is about two orders of
magnitude greater than polyethylene and the UV resistance is
horrible.

Wes N7Ws>>

None of that may matter because the electric field strength
in the insulator is probably low and almost all nylon has UV
inhibitors now.

The rope I use for antennas is nylon and it lasts a very
long time in the Georgia sun.

You have to look at the material characteristics of the
particular nylon material for UV life, and the end
application for dissipation factor problems. Even 100 times
nothing might still be considered nothing.

73 Tom

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vk3dbd

Re: OT: Ladder Line Spacers

Here in VK land, the sun shines pretty well as much as anywhere I think,
and with plenty UV radiation too.

the various "Poly" ropes commonly sold, last only a few weeks when used as
halliards etc. Nylon virtually lasts indefinitely - ten years in my
experience and it still seems good.
Dacron is the same stuff as Terylene to the best of my knowledge
respectively USA/UK names. I have experience with Terylene boat sails,
that seems to have a very long life. Not sure of it's relation to Nylon,
but I suspect very close.

I also have some WW2 antenna guys, made of I am sure some greenish colored
natural fibres with a woven outer "tube" layer over the inner, these were
available surplus in the 60's in a Can (opened by a tin opener!) Some have
been in use here for several years and although showing deterioration, are
still quite strong.

David VK3DBD

On Thu, May 13, 2010 at 9:03 AM, Tom W8JI <[hidden email]> wrote:

> The dissipation factor of Nylon is about two orders of
> magnitude greater than polyethylene and the UV resistance is
> horrible.
>
> Wes N7Ws>>
>
> None of that may matter because the electric field strength
> in the insulator is probably low and almost all nylon has UV
> inhibitors now.
>
> The rope I use for antennas is nylon and it lasts a very
> long time in the Georgia sun.
>
> You have to look at the material characteristics of the
> particular nylon material for UV life, and the end
> application for dissipation factor problems. Even 100 times
> nothing might still be considered nothing.
>
> 73 Tom
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>

n7ws

Re: OT: Ladder Line Spacers

In reply to this post by W8JI

How did we get from solid spacers to rope?

http://www.sdplastics.com/ultravioletresistance.html

--- On Thu, 5/13/10, Tom W8JI <[hidden email]> wrote:

From: Tom W8JI <[hidden email]>
Subject: Re: [Elecraft] OT: Ladder Line Spacers
To: "Wes Stewart" <[hidden email]>, [hidden email], "Ken Kopp" <[hidden email]>
Date: Thursday, May 13, 2010, 3:03 AM

The dissipation factor of Nylon is about two orders of magnitude greater than polyethylene and the UV resistance is horrible.

Wes N7Ws>>

None of that may matter because the electric field strength in the insulator is probably low and almost all nylon has UV inhibitors now.

The rope I use for antennas is nylon and it lasts a very long time in the Georgia sun.

You have to look at the material characteristics of the particular nylon material for UV life, and the end application for dissipation factor problems. Even 100 times nothing might still be considered nothing.

73 Tom

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David Gilbert

Re: OT: Ladder Line Spacers

I was wondering the same thing. I used nylon twine to hold up my roof
mounted 40m vertical when I lived in Phoenix and the stuff lasted for
well over ten years without any noticeable degradation in strength even
under that brutal sunlight, but every single molded nylon part of any
kind that I ever used for anything outdoors would become brittle and
crack in roughly a year. Unless the item description specifically
stated that it was UV stabilized I personally wouldn't trust it. The
current description only says that they are "surplus" parts that KF4TAP
discovered somewhere and thought they might be usable as spreaders ....
http://sites.google.com/site/kshamradioparts/home/keith-s-blog/newitem

73,
Dave AB7E

On 5/13/2010 10:07 AM, Wes Stewart wrote:

> How did we get from solid spacers to rope?
>
> http://www.sdplastics.com/ultravioletresistance.html
>
> --- On Thu, 5/13/10, Tom W8JI<[hidden email]> wrote:
>
> From: Tom W8JI<[hidden email]>
> Subject: Re: [Elecraft] OT: Ladder Line Spacers
> To: "Wes Stewart"<[hidden email]>, [hidden email], "Ken Kopp"<[hidden email]>
> Date: Thursday, May 13, 2010, 3:03 AM
>
> The dissipation factor of Nylon is about two orders of magnitude greater than polyethylene and the UV resistance is horrible.
>
> Wes N7Ws>>
>
> None of that may matter because the electric field strength in the insulator is probably low and almost all nylon has UV inhibitors now.
>
> The rope I use for antennas is nylon and it lasts a very long time in the Georgia sun.
>
> You have to look at the material characteristics of the particular nylon material for UV life, and the end application for dissipation factor problems. Even 100 times nothing might still be considered nothing.
>
> 73 Tom
>
>
>