My understanding is that corona discharge would be most off a single isolated
point, like the tip of a vertical ant or the ends of a yagi elements.
I doubt the corners of a quad would act like that as much if at all. Likely
someone has some hard test data on this.
I also wonder if a corona charge is enlarged by the spread out and larger
"area" of a quad loop. That is, is there a maximum charge that can be induced
on any one isolated object or is the charge larger solely because the structure
is larger?
Inquiring minds want to know.
Charles Harpole
k4vud@hotmail.com
----------------------------------------
> From: apolloeme@live.com
> To: adrianjamesflynn@gmail.com
> Date: Thu, 12 Jul 2012 21:11:10 -0700
> CC: amps@contesting.com
> Subject: Re: [Amps] Antennae (?)
>
>
> Here is the story:
> http://lists.contesting.com/_towertalk/2002-11/msg00393.html
>
> Best Regards,
> Pat Barthelow AA6EG
> From: adrianjamesflynn@gmail.com
> Date: Fri, 13 Jul 2012 00:01:14 -0400
> Subject: Re: [Amps] Antennae (?)
> To: apolloeme@live.com
> CC: alex.k2bb@gmail.com; k8ri@rogerhalstead.com; amps@contesting.com
>
> I seem to remember that there was 4 times as much Corona Discharge on a
> Cubical Quad Antenna due to the 4 right angle turns.Adrian KF7DYU
>
>
>
> On Thu, Jul 12, 2012 at 11:37 PM, Patrick Barthelow <apolloeme@live.com>
> wrote:
>
>
>
>
> I remember Corona Discharge, aggravated by thin air of High altitude, and QRO
> at HCJB in Quito Ecuador, literally burned, melted the antenna element tips,
> and led to the adoption of the Cubical Quad Antenna.
>
>
>
> Best Regards,
>
> Pat Barthelow, AA6EG
>
> > From: alex.k2bb@gmail.com
>
> > Date: Thu, 12 Jul 2012 23:28:58 -0400
>
> > To: k8ri@rogerhalstead.com
>
> > CC: amps@contesting.com
>
> > Subject: Re: [Amps] Antennae (?)
>
> >
>
> > Speaking of corona discharge...
>
> > I remember reading an article (back in radio technical university)
> > regarding antennas detuning due to corona at the end of elements.
>
> > Soviet Union, military, kilowatts :)
>
> >
>
> > ... iPhone
>
> >
>
> > On Jul 12, 2012, at 19:23, "Roger (K8RI)" <k8ri@rogerhalstead.com> wrote:
>
> >
>
> > > On 7/12/2012 8:00 PM, Jerry Kaidor wrote:
>
> > >>> The most effective ball on the top of the vertical is the copper float
>
> > >>> from
>
> > >>> a toilet. Especially appropriate when using 8 sweep tubes in parallel.
>
> > >>
>
> > >> *** Or six 3-500Zs?
>
> > >
>
> > > Sounds kinda fragile. I'd go for the 3CW20,000A7 myself.
>
> > > And there is a real reason for the ball on top. The prevent, or minimize
>
> > > corona discharge at those higher powers, even the legal limit on a
>
> > > mobile whip.
>
> > >
>
> > > Running the legal limit on multi band, stub tuned verticals can get
>
> > > colorful. I burned the plastic caps off the ends on one. All they
>
> > > needed was a 1/2" or 3/4" aluminum ball in place of the cap.
>
> > >
>
> > > BTW what material would make a good core for the matching transformer to
>
> > > run from 160 through six?
>
> > >
>
> > > 73
>
> > >
>
> > > Roger (K8RI)
>
> > >
>
> > >
>
> > >>
>
> > >> - Jerry Kaidor
>
> > >>
>
> > >>
>
> > >>>
>
> > >>> 73, Colin K7FM
>
> > >>>
>
> > >>> _______________________________________________
>
> > >>> Amps mailing list
>
> > >>> Amps@contesting.com
>
> > >>> http://lists.contesting.com/mailman/listinfo/amps
>
> > >>>
>
> > >>
>
> > >>
>
> > >> _______________________________________________
>
> > >> Amps mailing list
>
> > >> Amps@contesting.com
>
> > >> http://lists.contesting.com/mailman/listinfo/amps
>
> > >>
>
> > >>
>
> > >
>
> > >
>
> > >
>
> > > _______________________________________________
>
> > > Amps mailing list
>
> > > Amps@contesting.com
>
> > > http://lists.contesting.com/mailman/listinfo/amps
>
> > _______________________________________________
>
> > Amps mailing list
>
> > Amps@contesting.com
>
> > http://lists.contesting.com/mailman/listinfo/amps
>
>
>
> _______________________________________________
>
> Amps mailing list
>
> Amps@contesting.com
>
> http://lists.contesting.com/mailman/listinfo/amps
>
>
>
> _______________________________________________
> Amps mailing list
> Amps@contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
>
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|