Re: [TowerTalk] Broadbanding 80 meter dipole

["Roger (K8RI) on TT" <K8RI-on-TowerTalk@tm.net>]

Mounted on the tower would put the tuners about 75 to80 feet from the 
feed points and although center fed they are a LONG way from being 
balanced, requiring 2 common mode chokes to keep RF out of the shack on 75.
73, Roger (K8RI)

On 8/17/2017 Thursday 8:17 PM, Steve Maki wrote:
> If the tuner(s) are mounted on the tower.
>
> -Steve K8LX
>
> On 8/17/2017 7:53 PM, Steve Maki wrote:
> > Except Roger is envisioning sloping *dipoles*, FIVE of them. Somehow 
> > I can't picture five tuners hanging out there in mid-air at the 
> > feedpoints, begging to be tuned up and down the band. Not to mention 
> > that whatever pattern he's hoping for will be hopelessly compromised 
> > by common mode currents on the feedlines between the antenna and tuner.
> > -Steve K8LX
> >
> > On 8/17/2017 4:16 PM, Kimberly Elmore wrote:
> >
> > > Rod's idea is by far the best. Slopers are weird creatures. While 
> > > you can broadband antennas by making the elements with a large 
> > > diameter (as in a cage) the mechanical complexity isn't worth it. If 
> > > they absolutely positively must be resonant, well...
> > > Kim N5OP
> > >
> > >        From: Rod Greene via TowerTalk <towertalk@contesting.com>
> > >   To: Roger (K8RI) on TT <K8RI-on-TowerTalk@tm.net>; 
> > > "towertalk@contesting.com" <towertalk@contesting.com>
> > >   Sent: Thursday, August 17, 2017 2:25 PM
> > >   Subject: Re: [TowerTalk] Broadbanding 80 meter dipole
> > > Or use an auto tuner at the feedpoint to match the slopers on 
> > > whatever band/freq you want to use. That's what I do.
> > > 73, Rod/w7zrc
> > >
> > >
> > >        From: Roger (K8RI) on TT <K8RI-on-TowerTalk@tm.net>
> > >   To: "towertalk@contesting.com" <towertalk@contesting.com>
> > >   Sent: Thursday, August 17, 2017 12:33 PM
> > >   Subject: [TowerTalk] Broadbanding 80 meter dipole
> > > I've seen a few possibilities in the past, but I'd like to add a dew
> > > slopers to come up with the 5 used for some directivity, gain and front
> > > to back. Switched coils at the feedpoint with frequency sensing would
> > > likely work.  I've had excellent results with just a couple switched
> > > slopers on 40.
> > >
> > > To complicate things I'd like to do this and maintain the dual band 
> > > 75 /
> > > 40 meter operation, which would likely require separate feedlines. The
> > > unused line would / could end up as a stub.  I could possibly use the
> > > frequency sensing to disconnect the coax for the unused band.
> > >
> > > Thoughts?
> > _______________________________________________
> >
> >
> >
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--

73

Roger (K8RI)


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