On Thu, Jul 01, 2004 at 07:27:02AM -0500, Matt Patterson wrote:
>
> I'm getting ready to begin my tower project here and have decided that I'd
> like to have a nice big beam for 6 meters. I'm thinking about a 30 to 35'
> boom with 8 or 9 elements would be nice. I was wondering if anyone on this
> group has modeled something similair to what I'm describing or has plans to
> build one.
I have a design that I built up - it is based on a Cushcraft 617-6B boomer.
The Cushcraft 617-6B is 6 elements on a 34 ft boom. Several years ago
there was a 7 ele modification to the 617-6B that was published in
one of the conference proceedings - and it looked very good.
I was going to build the 7 ele design but I decided that I really
wanted to go with a OWA type design that uses a 50 ohm feed point
so I ended up with 8 elements on a 34 ft boom. I used a 34 foot boom
because that is what I had - the Cushcraft 617-6B.
Here is the YO file.
K5TR 8 ele 6m yagi
50.000 50.200 50.400 MHz
8 elements, inches
1.6464 0.7500 0.6250
0.0000 1.7500 22.2500 35.4538
24.2071 0.0000 22.2500 35.9953
35.9632 1.7500 22.2500 32.2806
79.7107 1.7500 22.2500 30.1797
163.6383 1.7500 22.2500 27.7787
252.4418 1.7500 22.2500 28.4504
324.1258 1.7500 22.2500 27.9235
404.0000 1.7500 22.2500 21.8442
Match: 1 0.5000 1.0000 18.1250 0.5000 0.0 50.0 0.0808
Bracket: 4 1.0000 3.5000 1.0000 0.1250
It seems to work and I am happy with it.
> I know m2 makes one close to what I'm looking for BUT I would
> like to stay away from commercial stuff if possible.
I also have a M2 6M7JHV and I find it to be a very good
antenna - a bit light weight but it has been up for 3 years
now and I would buy another one if I needed another 30' boom yagi
and did not want to build one.
I am still pondering what I would like to do to improve my
6 meter setup and I have pretty much decided that I will
put up 2 or 3 fixed yagis that have slightly wider beam widths.
I think these yagis will be on about 12 foot booms - and will
scaled down versions of the 6 element OWA designs that I use
on 10 and 20 meters.
http://www.kkn.net/~k5tr/blanco/6ele_20m_on_44.htm
http://www.kkn.net/~k5tr/blanco/6ele_10m_OWA.html
photos:
http://www.kkn.net/~k5tr/photo/k5tr/10m-yagis-3.jpg
http://www.kkn.net/~k5tr/photo/k5tr/10m-yagis-2.jpg
and
http://www.kkn.net/~k5tr/photo/k5tr/20m-stack-1-m.jpg
http://www.kkn.net/~k5tr/photo/k5tr/20m-stack-3-m.jpg
http://www.kkn.net/~k5tr/photo/k5tr/20m-stack-5-m.jpg
I will still keep the 8 element up as the high rotary yagi.
--
George Fremin III - K5TR
geoiii@kkn.net
http://www.kkn.net/~k5tr
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