I've built many a quagi .. but usually out of plywood sheet and #10
house wire ;)
That was my favorite antenna for FD uplink to the old RS birds, and
one would last 2-3 years and folds up nicely
so you are going to put directors in both vertical and horizontal
planes and switch the feedpoint from top/bottom to side?
also, the original quagi design article calls for an insulated
(wooden, actually) boom, you'd have to diddle with the design a bit to
get an optimum solution for e.g. an aluminum boom ..
de w1rt/john
On Fri, May 18, 2012 at 6:47 AM, Cal Zethmayr <w4gmh@cox.net> wrote:
> Has anyone on this list built a Quagi?
>
> How about a dual polarized one?
>
> A few years ago I bought a used M2 dual polarized beam (originally used for
> sattellite work) and one of the engineers at M2 helped me with info on making
> two separate baluns so I could modify it to be either vertical or horizontal
> polarization. We installed it at the top of our Christmas tree beam
> arrangement at our club station. Using a remote relay control we can use it
> vertical (switch position #1) or horizontal (switch position #2). of course
> we tweaked the tuning so the horizontal is best at the low end of two meters.
>
> NOW... I have planned on building a 20+ element Quagi to go up at the 125 ft
> level on the Rohn 45 that is going up at my QTH this summer.
>
> AND I wonder if it would be possible to make it a dual polarized version?
> the alternative of course would be two quagi's with one being vertical and
> the other horizontal. A friend of mine has a double quagi (both are vertical
> polarization) and he works into our repeater with 3 watts... over a distance
> of 37 miles.
>
> The tricky part would be the design of the driven quad ... with two
> different feed points... and having a relay mounted very near the boom.
> By the way, I will be using a long length of fibreglass high pressure gas
> line for the boom. That is what the guy who built the side by side quagi's
> gave me, and what he used on his pair. It only weighs 5 lbs!
>
>
> any suggestions anyone?
>
> Cal Z
> W4GMH
> Crestview Florida
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