Understanding what Bruce has posted would support the theory that a cage
feed tower is indeed fatter with a lower impedance and thus less
proclivity to arc over on the insulated elements.
Herb Schoenbohm, KV4FZ
On 12/18/2014 12:33 PM, k1fz@myfairpoint.net wrote:
One of the factors for arc over is the diameter of the tower and
top support pipe diameter & length. A really FAT 1/4 wave tower may
have 1000 ohms at the top, while a skinny tower would have much more.
The higher the impedance, the higher the voltage to cause arc overs. 73
Bruce-K1FZ
www.qsl.net/k1fz/beveragenotes.html
On Thu, 18 Dec 2014 10:05:16 -0600, Joel Harrison <w5zn@w5zn.org> wrote:
Stan - For about 8 years, up until this past spring, my shunt fed tower
> for 160 had a KT34XA (insulated elements, later upgraded to a
KT36XA same
> insulated elements) at the top and I never experienced any issue at
all
> running 1500 watts, even during a few contests where, as you know,
you are
> running "continuous" for an extended period. I've read discussion
about
> whether the coax should run inside -vs- outside the tower, mine ran
> outside. >
> Thanks...Stan, K5GO
> > _________________
> > Topband Reflector Archives - http://www.contesting.com/_topband
> >
>
>
> www.w5zn.org
>
_________________
Topband Reflector Archives - http://www.contesting.com/_topband
_________________
Topband Reflector Archives - http://www.contesting.com/_topband
|