...and another question: I have an Inv L (appx 80 vertical and 50 feet
downsloping "horizontal") with ground radials (#16) and am wondering how much
directionality the horizontal wire gives. The horizontal wire here runs
roughly east-west. It's a reasonable DX antenna--I can work EU from the West
Coast, which isn't always easy. For domestic contests such as the ARRL 160 M
contest (it's a domestic contest from the West Coast and a different contest
from the East Coast, but let's not get into how unfair that is) I wonder how
much improvement I'd get if the horizontal wire were broadside to the East.
All feedback welcome.
73,
Alan/K6SRZ
--- On Tue, 12/8/09, DAVID CUTHBERT <telegrapher9@gmail.com> wrote:
> From: DAVID CUTHBERT <telegrapher9@gmail.com>
> Subject: Re: Topband: inverted L pointers please
> To: jwatrous@sonic.net
> Cc: topband@contesting.com
> Date: Tuesday, December 8, 2009, 6:45 PM
> John,
>
> the goal is to make an inverted-L that works as well as a
> quarter wavelength
> vertical. Given a very good ground system a rather
> vertically short
> inverted-L is nearly as efficient as the vertical. Given a
> poor ground
> system a taller inverted-L will give better performance.
> Inverted-L
> radiation resistance:
>
> 40' vertical and 95' horizontal, 12 ohms
> 50' vertical and 85' horizontal, 22 ohms
> 60' vertical and 75' horizontal, 29 ohms
> 70' vertical and 65' horizontal, 43 ohms
>
> Dave WX7G
>
> On Tue, Dec 8, 2009 at 5:45 PM, <jwatrous@sonic.net>
> wrote:
>
> > I'm about to build an inverted L for 160 after 50
> years of ham radio.
> > I have looked at many webpages, but is there one you
> experts can recommend?
> >
> > Thanks in advance,
> >
> > John
> >
> >
> > John Watrous, K6PZB
> >
> > 707 360 5496 cel
> >
> > john@jwatrous.org
> >
> > _______________________________________________
> > 160 meters is a serious band, it should be treated
> with respect. - TF4M
> >
> _______________________________________________
> 160 meters is a serious band, it should be treated with
> respect. - TF4M
>
_______________________________________________
160 meters is a serious band, it should be treated with respect. - TF4M
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