[Amps] Antennae (?)

[Patrick Barthelow]

Here is the story:
http://lists.contesting.com/_towertalk/2002-11/msg00393.html 

Best Regards,   
Pat Barthelow  AA6EG 
From: adrianjamesflynn at gmail.com
Date: Fri, 13 Jul 2012 00:01:14 -0400
Subject: Re: [Amps] Antennae (?)
To: apolloeme at live.com
CC: alex.k2bb at gmail.com; k8ri at rogerhalstead.com; amps at 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 at 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 at gmail.com

> Date: Thu, 12 Jul 2012 23:28:58 -0400

> To: k8ri at rogerhalstead.com

> CC: amps at 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 at 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

> >>>

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> >>

> >>

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> >

> >

> >

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