Re: [TowerTalk] 80m DX special dipole

[Guido Tedeschi <guidoted@gmail.com>]

22.5 pF per foot


Il 11/09/2018 22:41, Jim W7RY ha scritto:
> Sent from my wireless communicator
>
> On Tue, Sep 11, 2018, 3:36 PM Jim W7RY <jimw7ry@gmail.com> wrote:
>
> > What about capacitance per foot?
> >
> >
> > 73
> > Jim w7ry
> >
> >
> >
> > Sent from my wireless communicator
> >
> > On Tue, Sep 11, 2018, 2:27 PM Guido Tedeschi <guidoted@gmail.com> wrote:
> >
> > > I built an 80m DX special dipole.
> > >
> > >
> > > http://1vc.typepad.com/ethergeist/2011/01/a-broadband-contest-antenna-for-80m.html
> > >
> > > I used the Messi & Paoloni BROAD-PRO 50/C cable instead of RG213
> > > (https://messi.it/dati/immagini/BROAD-PRO50-All6_EN.pdf).
> > >
> > > The cable lenghts are recalculated for a velocity factor of 0.85 instead
> > > of 0.66 and the overall lenght (cables plus wires) is the same of the
> > > original project, but the result is not satisfactory.
> > >
> > > The SWR pattern is correct but it is like having an offset of about 2:
> > > the two lower dips have an SWR of about 2 and the highest SWR on band
> > > reach 3
> > >
> > > What could be wrong?
> > >
> > > Is it necessary to use a cable with 0.66 velocity factor?
> > >
> > > Thanks and 73
> > >
> > > Guido, ik2bcp
> > >
> > >
> > > _______________________________________________
> > >
> > >
> > >
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