[TowerTalk] Length of Sloper?

[GREG FICHER]

Hi Stan.

I have been struggling with 160 myself.  I have an IAC 160M bazooka inverted
L that is fair.
I was wondering if shunt feeding my HG70HD tower would do better.  I have
alot of aluminum at the top
in the form of an Optibeam OB12/6.  But my question is how well will that
work as a cap hat then all the
elements are insulated from the boom??

Tnx
Greg
AB7R


On Wed, Dec 29, 2010 at 4:22 PM, Stan Stockton <k5go at cox.net> wrote:

> Dick,
>
> Quarter wave slopers just don't work well unless there is top loading -
> at least that has been my experience.  If I had a 60 foot tower I would
> shunt feed it and use it as a vertical.  You will be quite pleased with
> the way it will work with a reasonable ground system under it.  I will
> work fine with a small tribander for 80 and 160 so your ground system
> will be good for the future.
>
> To answer your question, I would be prepared to make it a LOT longer
> than you think it should be.  I would start out with about 85 feet of
> wire and fold it back a couple feet at a time to get it in the band
> where you can then finalize it.  I think you would be better off with an
> Inverted V at 60 feet and then shunt feed the tower after you get the
> tribander up.
>
> Stan, K5GO
>
> ----- Original Message -----
> From: <RLVZ at aol.com>
> To: <towertalk at contesting.com>
> Sent: Wednesday, December 29, 2010 5:59 PM
> Subject: [TowerTalk] Length of Sloper?
>
>
> > Hi Guys,
> >
> > I'm installing an 80-meter Sloper on a self-supporting 60'  tower.
> > (no
> > guys)  I don't have a MFJ-259 or other antenna bridge  with me so I'd
> > appreciate your thoughts to help get me in the ballpark.   The
> > 80-meter Sloper will
> > attach to the tower at the 55'  level.  Currently there are no other
> > antennas
> > on the 60' tower.   A couple questions:
> >
> > 1) With no other antennas on the 60' tower, do you think the length of
> > the
> > Sloper wire will be close to the formula 234/freq?  Or do you think
> > the
> > Sloper will wind up needing to be  longer or shorter than  234/freq?
> >
> > 2) The once I get the Sloper tuned for minimum SWR on 80-meters, if I
> > later
> > add a Tribander to the top of the tower I'll no doubt need to re-tune
> > the
> > Sloper, but do you think the Sloper will need to be shortened or
> > lengthened after the Yagi is added?
> >
> > Thanks & 73,
> >
> > Dick- K9OM
> > _______________________________________________
> >
> >
> >
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