[Top] [All Lists]

Re: [TenTec] Open-Wire Feeders

To: w1ael@mindspring.com,Discussion of Ten-Tec Equipment <tentec@contesting.com>
Subject: Re: [TenTec] Open-Wire Feeders
From: Robert & Linda McGraw K4TAX <RMcGraw@Blomand.Net>
Reply-to: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Mon, 06 Feb 2006 06:47:47 -0600
List-post: <mailto:tentec@contesting.com>
Al, W1AEL,  is very correct on this one.  Thus the reason one finds 
commercial Ladder line having a spacing of about 1" and Window line having a 
space of about 1".  As the spacing becomes a larger part of a wavelength, 
i.e. at higher frequencies, radiation can start to be a problem.  The 
homebrew line is usually easier to build if the spacing is 2" to 3" and use 
larger conductors such as #14 or #12.

Bob, K4TAX

----- Original Message ----- 
From: "Allan H Kaplan" <w1ael@mindspring.com>
To: <tentec@contesting.com>
Sent: Sunday, February 05, 2006 9:11 AM
Subject: Re: [TenTec] Open-Wire Feeders

> Catfish wrote: ..."the wider the space the better",
> but I urge a more moderate approach.   Getting the lines more than a few
> electrical degrees apart will allow them to radiate some of the power we
> would like to transmit to the antenna.   Art Collins held his
> engineering staff to a very demanding tolerance of  one electrical
> degree -- about an inch at 30 MHz..   I believe that a 3 to 6 inch
> spacing is reasonable.   I use line supplied by W7FG, spaced at about 4
> inches.  It has held up well in the hills of east Tennessee.  73, Allan
> W1AEL.
> _______________________________________________
> TenTec mailing list
> TenTec@contesting.com
> http://lists.contesting.com/mailman/listinfo/tentec 

TenTec mailing list

<Prev in Thread] Current Thread [Next in Thread>