[VHFcontesting] QUAGI'S

[John D'Ausilio]

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 at 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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