RE: [Elecraft] Ladder Line spacers

[Ron D'Eau Claire]

I've seen those. Good idea! 

With so many plastics on the market today, I always check a sample before
subjecting it to RF. On the sort of open wire lines almost everyone uses
today, operating at moderate SWR levels, not only are there big RF currents
flowing at the current loops there are big RF voltages 1/4 wavelength away!
An marginal RF insulator at one of these points would dramatically increase
losses. 

I lean on the "microwave test": put a sample with a glass of water in the
microwave for a minute or two. If it gets warm (or melts!) it's not a good
material to use around RF. 

Ron AC7AC

-Original Message-
I've made some ladder line using plastic parts of electrical staples.

 Homely Depot, Lowes, etc sell staples for large electrical cable that
consist of a plastic bridge with a nail inserted thru a hole at each end.
They come in various sizes (e.g., for 3/4 inch, 1 inch, two inch service
entrance wire). If you pull out the nails you can insert your wires thru the
holes and secure them with a dab of hot-melt glue. Plus you'll have a bunch
of nails left over.

Ray K2HYD

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Re: [Elecraft] Ladder Line spacers

[David Cutter]

Ideally you want a spreader that you don't have to thread the wire thro: 
imagine threading hundreds of feet or wire thro tiny holes in scores of 
plastic parts.


I helped a friend make spreaders from the only plastic we had which was 
stiff plastic hose pipe.  We cut it into 4" (100mm) lengths then split each 
length into 4 pieces length-ways.  About 1/2" (12mm) from each end I drilled 
a hole of about the same or slightly smaller than the wire size, then took a 
sharp modelling knife (Stanley knife over here) to slit from the hole to the 
outer edge.  The wire was then pressed into the slit and held at the tight 
hole.


David
G3UNA




- Original Message - 
From: "Albers" <[EMAIL PROTECTED]>

To: 
Sent: Saturday, November 17, 2007 1:48 PM
Subject: [Elecraft] Ladder Line spacers


I've made some ladder line using plastic parts of electrical staples.

Homely Depot, Lowes, etc sell staples for large electrical cable that 
consist of a plastic bridge with a nail inserted thru a hole at each end. 
They come in various sizes (e.g., for 3/4 inch, 1 inch, two inch service 
entrance wire). If you pull out the nails you can insert your wires thru the 
holes and secure them with a dab of hot-melt glue. Plus you'll have a bunch 
of nails left over.


Ray K2HYD
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