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
>>>
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>>
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>
>
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