[TowerTalk] A poll of Cubical Quad qwners
TexasRF at aol.com
TexasRF at aol.com
Sat Jan 17 17:53:00 EST 2009
Have you considered using a few snap on ferrite cores on the end of the
matching sections where they connect to the driven element?
In a message dated 1/17/2009 2:34:37 P.M. Central Standard Time,
k5pgw at yahoo.com writes:
Hello to all on the List. I decided that I needed to join the list since I
have antenna questions and this is where the knowledgeable hams, regarding
antenna things, hang out.
I am ready to install my 2 element, five band Cubex Cubical Quad on my tower
and have been anguishing over whether to install Choke baluns for each band.
I am feeding the quad with separate coaxial matching transformers for each
band supplied by Cubex.
Question: How many of you, using Cubical Quads feed them directly with Coax
cable and how many of you install a balun and what type? Since I am feeding
each, of the five elements, separately, if I use the unbalanced to balanced
device such as a Choke coil, five separate choke coils (baluns) would be
For those of you, who have fed them both ways, what actual differences have
you experienced in quad performance with and without the balun?
I spoke with W5ZR, this morning, at the Hammond, Louisiana Hamfest about
this subject and he recommended going with direct coax feed without the
unbalanced to balanced device. He has two large quads and is happy with the manner in
which he feeds them.
I am not into "knat's eye performance", I just want the quad to perform
well. I also don't want to build any problems into the array due to the fact that
it will be at least 75 feet on a fixed/guyed tower.
For those of you who received my earlier query about resonant freq with the
20 meter antenna wires two feet off the ground, I learned that the 20 meter
element is resonant at 14.000.00 mhz that close to the ground according to my
antenna analyzer. I am pleased with that resonant point because I know the
resonant point will rise, as the antenna is raised to 75 feet, and the ground
If this topic, (balun fed quads) has been covered previously, I would
appreciate it if you would so direct me to the archives. Your knowledge, based upon
your experience, will be greatly appreciated on this subject (balun feeding
quads). Thanks and 73, John, K5PGW
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