INSULATING GUY WIRES - de N4KG
Put an insulator as close to the tower as possible. Rember, the
tower conducts and you basically have a conductor from insulator
to insulator acting as a parasitic element RIGHT UNDER your antenna.
My first insulators are 3 to 5 ft from the tower.
I like to put my SECOND isulator 12 ft ( or less ) down from the first.
This
is 75% of a half wavelength on TEN Meters and should be invisible to the
antenna. For really good isolation, another 10 to 12 ft piece is nice.
Remember to cut the guy wire about one foot shorter to allow for the
loop ends of the guy wraps.
>From that point, lengths of 27 , 40, or 54 ft are non-resonant in
the
CONVENTIONAL bands. Unfortunately, they ARE resonant in the
WARC bands. Can you spell P H I L L Y S T R A N ?
Better yet, can you AFFORD Phillystran? Call Texas Towers!
(Gerald, my address is OK in the Callbook! :-) )
de Tom N4KG
............................
On Mon, 06 Oct 1997 20:52:25 -1000 Jonathan Starr <kalepa@maui.net>
writes:
>I want to insulate the top sections of guy wire (1/2" for
>100' of Rohn 80) for my new tower and need to know what
>lengths to use. The old ARRL handbook says 24' to 29', 39'
>to 40', and 57' to 58' are non-resonant.
>
>Does anyone have any comments or experiences with these
>lengths ? The wire will be terminated with preforms.
>
>Aloha,
>
>Jonathan Starr KH6X
>kalepa@maui.net
>
>
--
FAQ on WWW: http://www.contesting.com/towertalkfaq.html
Submissions: towertalk@contesting.com
Administrative requests: towertalk-REQUEST@contesting.com
Problems: owner-towertalk@contesting.com
Search: http://www.contesting.com/km9p/search
|