Cal,
Have you looked at Loop Fed Array (LFA) Yagis designed by G0KSC?
I understand that some folks have constructed dual polarity versions.
See the G0KSC website, which includes a long list of antenna designs for HF
right through to 70cms, here - http://www.g0ksc.co.uk/
Roger, G0BSU
-----Original Message-----
From: vhfcontesting-bounces@contesting.com
[mailto:vhfcontesting-bounces@contesting.com] On Behalf Of Cal Zethmayr
Sent: 18 May 2012 11:47
To: vhfcontesting@contesting.com
Subject: [VHFcontesting] QUAGI'S
Importance: High
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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