Thanks Tim, I will add supplies for that to the list. Do you think the 41'
of EHS at the anchor ends will be OK ? Ron
On Wed, Oct 2, 2019, 3:47 PM Tim Duffy <k3lr@k3lr.com> wrote:
> I had a problem with just Preforms attaching to the tower legs connection -
> which caused distortion in the pattern of close mounted Yagi's. That is,
> Yagi's that were mounted only a few feet above a guy connection point. The
> VSWR of the affected Yagi would change with rotation and the effect of
> three
> Preforms connected to the tower was confirmed with modeling. The solution
> was to use a bent pin shackle and an insulator right at the tower
> connection. You can see it in this view of the middle four element 40 meter
> OWA Yagi stack at K3LR:
> http://www.k3lr.com/2016/ring.jpg
>
> Using insulators at the tower connection completely solved the pattern
> distortion and VSWR changes with rotation.
>
> 73
> Tim K3LR
>
> -----Original Message-----
> From: TowerTalk [mailto:towertalk-bounces@contesting.com] On Behalf Of
> K9MA
> Sent: Wednesday, October 2, 2019 4:20 PM
> To: towertalk@contesting.com
> Subject: Re: [TowerTalk] EHS leads for Phillystran
>
> i recently put up 70 feet of Rohn 25 using Phillystran. The first 4-5
> feet from the tower are EHS, to minimize the chance of something dropped
> from the tower cutting the Phillystran. From the anchor up to about 15
> feet (vertically) above the ground is EHS. The rest is Phillystran. I
> never tried to figure out whether the lower EHS sections are resonant,
> but they're a long way from the antennas. Seems to work fine.
>
> 73,
> Scott K9MA
>
>
>
> On 10/2/2019 14:11, Ron WV4P wrote:
> > Good afternoon !
> >
> > Having heard enough negative on the Polygon, we have shifted to
> > Phillystran..
> > What I have read says you must run EHS Leaders (I have Plenty in stock)
> but
> > not over 50% of the total guy length in EHS.
> >
> > Doing some modeling (not very good at) and reading, it looks like 41' of
> > EHS would work well for not being resonate, being plenty high up to not
> > worry about fire / vandals / beavers.
> > 41' would also save a good bit of $ on the cost of Phillystran for 5
> > towers.
> >
> > Any advice ? to long ? Just right ?
> > Thanks in advance.
> > Ron, WV4P
> > _______________________________________________
> >
> >
> >
> > _______________________________________________
> > TowerTalk mailing list
> > TowerTalk@contesting.com
> > http://lists.contesting.com/mailman/listinfo/towertalk
>
>
> --
> Scott K9MA
>
> k9ma@sdellington.us
>
> _______________________________________________
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