Topband: Shunt Feed - Insulated Elements on Yagi

[Herbert Schoenbohm]

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 at 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 at 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
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