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[TowerTalk] Quad Element Tuning

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Subject: [TowerTalk] Quad Element Tuning
From: (Maurizio Panicara)
Date: Sat, 8 Sep 2001 19:28:03 +0200

> >  Actually my first gain antenna was a 2L triband quad and K7WA
> > and I spent  a whole Saturday screwing around with the tuning.
> > That was it for  quads. That  and the fact that I wanted to put a
> > 40M yagi up too and couldn't do  it with  the quad.
> >
> > Cheers,     Steve    K7LXC
> > Tower Tech
> >
> Are you saying that you still can't just "cut and play" with 2L Quads?
> What about W4RNL's website, or others, for a good set of dimensions.
> Tom  N4KG

I don't know what Steve meant, I know that even a 2L multiband quad is a
challenge and final F/B fair when some band is close to each other or
harmonically related.
Modeling and tests proved to me that 12m and 10m loops doesn't live happily
together, expecially in 3 or more elements loop antennas and particularly
when same parasitic type loops are on a single cross arms.
I had a  5x10/4x15/3x20 multiband delta loop on a single boom that worked
fine, but 10 meters stopped (refused) to work properly when the 40m loops
were added, no matter everything was tried to refine 10m loops.
People often think that's all right with their multiband directional antenna
because of a low SWR and some F/B exist, but if they could compare with a
reference antenna, in some cases the disillusions could be many and big.

Mauri I4JMY

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