[TowerTalk] Pre-Installation Tuning of Cushcraft TEN-3 Yagi
kb5urq at hotmail.com
Fri Jul 4 15:25:55 EDT 2008
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:
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
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