Gentlemen,
I am using circular polarization on TEN meters, using a 4 element quad.
Loops acting as parisitic elements "don't care" about polarity, with NO
polarization attenuation. That's another reason that quads rule. QSB caused
by polarity rotations are not isolated by the typical high "vertical to
horizontal isolation" that the parisitic elements on yagis have. In quads...
only the driven element attenuates the opposite polarity. For more info on
the topic of QSB fading with respect to: "Faraday rotations in the
ionesphere" , please go to the attached link, See my quad (and my son) and
click on "ARTICAL". http://www.amwindow.org/pix/htm/ab2kc/ab2kc5.htm
George AB2KC
----- Original Message -----
From: "Richard Karlquist" <richard@karlquist.com>
To: <RLVZ@aol.com>; <towertalk@contesting.com>
Sent: Thursday, November 20, 2003 10:27 PM
Subject: RE: [TowerTalk] Horizontal + Vertical Polarization Question
> > Has anyone experimented with feeding both a horizontally polarized and
> > vertically polarized antenna simultaneously on HF? Such as,
> > feeding a horizontally
> > polarized yagi and a vertical on 20, 15, or 10 meters?
>
> I haven't done that, but I have done a fair amount of A/B'ing
> of a 20 meter ground mounted vertical vs an inverted vee at 60
> feet. More often than not, one is better than the other,
> but it's equally likely to be either one. If you could
> feed both without destructive interference (and that
> assumption is by no means assured), then you would get
> a diversity effect and reduce QSB.
>
> I have also A/B'ed 2 verticals 800 feet apart and QSB
> on them is different (one may be up while the other is
> down, etc).
>
> Hope that helps.
>
> Rick N6RK
> _______________________________________________
>
> See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless
Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any
questions and ask for Sherman, W2FLA.
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
>
_______________________________________________
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather
Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions
and ask for Sherman, W2FLA.
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|