Follow the directions.....
MAL
N7MAL
BULLHEAD CITY, AZ
http://www.n7mal.com
Everyone in the world is
entitled to be burdened
by my opinion
----- Original Message -----
From: Jason
To: towertalk@contesting.com
Sent: Friday, July 04, 2008 22:25
Subject: [TowerTalk] Pre-Installation Tuning of Cushcraft TEN-3 Yagi
I am in the process of checking SWR prior to installation of a TEN-3 Yagi (3
element Yagi for 10 meters). The Cushcraft documentation states that I
should temporarily mount the antenna with the boom vertical and reflector
atleast one foot off the ground on a non-metallic support.
I have it 6 ft. off the ground mounted on a fiberglass ladder (non
conductive).
Using an MFJ-259 SWR Analyzer, I recorded the following data after adjusting
the match on the driven element:
Frequency SWR
28.205 3
28.346 2.5
28.482 2
28.549 1.7
28.618 1.5
28.68 1.2
28.828 1
28.939 1.2
28.979 1.5
29.0298 1.7
29.076 2
29.158 2.5
29.227 3
My goal is to tune this antenna for a resonant frequency of 28.3MHz and I
have matched the dimensions provided by Cushcraft towards this aim. I have
tried extending the dimensions of the driven element by 2" but only moved
the resonant frequency down to 28.647MHz.
My question is whether I should trust the Cushcraft documentation and put
it up as they have described, assuming that the close proximity to the
ground is disturbing my measurement.
Thanks for any help / advice you can provide!
73 de KB5URQ
Jason
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|