On 4/8/2020 7:23 PM, Gary wrote:
I used my DX Engineering gift certificate to buy a copy of the "Champion Radio HF
Vertical Performance - Test Methods & Results". I really enjoyed the book and
learned a lot.
That test report is a very valuable resource. So is the companion report
on tri-banders.
It looks like a vertical is the only antenna I am going to get in my terraced
back yard. Has anyone done a similar look at verticals where they looked at
radials vs no radials? There are a lot of claims out there about verticals that
work without radials. The above test looked at some of those antennas but they
were mounted over a radial field...
Here's both a slide deck on the subject and an app note that I wrote for
National Contest Journal a few years ago. That report was the "jumping
off point" for my work. Note that performance of verticals is STRONGLY
dependent on soil conductivity, and these documents shows that, in
general, most work better if they can be roof mounted.
http://k9yc.com/VerticalHeight.pdf
http://k9yc.com/AntennaPlanning.pdf
73, Jim K9YC
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