[TowerTalk] Fwd: OCFD

[Patrick Greenlee]

On 3/26/2017 12:17 PM, Hans Hammarquist via TowerTalk wrote:
> Hi Jim,
>   
> Everything has a capacitance to somewhere. Even Mother Earth has a
> capacitance. You can select what reference point you like, Moon, Sun, Pluto. I
> never really grasped it myself when I took my classes in physics.
>   
> Anyhow, there is a distributed capacitance along the dipole wires that get,
>   what's called, end-effect. That's why you don't cut the dipole to exactly
> 1/2  wave length but a little shorter, most around 95%.
>   
> We all, I hope, know that the voltage is highest at the tips of the dipole
> (or 1/4 wave verticals for that matter). That's why you put a good
> insulator at  the dipole ends, not just a non-conducting cord (what might catch fire
> a rainy  day).
>   
> Just my dime to the conversation,
>   
> Hans - N2JFS
>   
>    
> ____________________________________
>   
>
> ## BTW,  when you mentioned dipoles etc, having all their voltage at the
> tips,as
> a  result of capacitance,  capacitance between what and what ?    Is it
> capacitance
> between the tips, like in an arc ?    I cant  see it being C to ground
> below.  What
> if the dipole is in outer space  ?
>
> Jim   VE7RF
>
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