To suggest a simple approach, how about just rotating the boom 90 degrees on
axis?
David AB2YI
On May 21, 2012, at 3:00 PM, vhfcontesting-request@contesting.com wrote:
> From: Cal Zethmayr <w4gmh@cox.net>
> Date: May 21, 2012 12:39:08 AM EDT
> To: vhfcontesting@contesting.com
> Subject: [VHFcontesting] dual polarized Quagi
>
>
> My boom will be a fiberglass 25 foot length of 2 inch high pressure gas line.
> it is very heavy duty but very light to hold. less than 5 lbs.
>
> I would use a set of vertical and also horizontal elements. I'll use a drill
> press to drill the holes.
>
> I'd size the vertical elements for the upper end of the band where most
> repeaters and mobiles would be and the horizontal elements for the lower end
> of two meters where most cw and sideband activity is.
>
> One of my helpful local elmers suggested I could use a full wavelength of
> ladder line from each of the feed points on the driven element to the relay
> box that would be on the bottom of the boom. The relay would short the feed
> point of one while the other would then feed the coax down the tower 125 feet
> to the entrance to the shack. He thinks that the shorted wavelength would
> thus be tansparent to the tuning.
>
> Anybody have any comments?
>
> Cal Z
> W4GMH
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