[TowerTalk] Carolina Winsome and vertical radiator question

[Steve Hunt]

I just tried a SPICE analysis using those two leg impedances and a 4:1 
voltage balun. With a moderate braid path impedance - 200 Ohms - there 
was no significant difference in braid current whichever way round the 
balun was connected.

Steve G3TXQ


On 25/01/2015 20:32, Steve Hunt wrote:
> The proportion of current that flows back down the shield compared to 
> that which flows into the attached dipole leg will depend on the 
> relative impedances of those two paths. In the case of a half-wave fed 
> one third from one end, the two leg impedances are almost identical: 
> 319Ω/-87.7 degrees for the short leg and 334Ω/+72 degrees for the long 
> leg in a 132ft dipole I modelled. That suggests there'd be little 
> difference whichever side you connected the braid.
>
> But of course, if you put a 4:1 voltage balun at the feedpoint the 
> braid isn't connected directly to either leg :)
>
> Steve G3TXQ
>
>
>
> On 25/01/2015 19:20, Stan Labinsky Jr. wrote:
>> OK, it just crossed my mind... happens once in a while.
>> If you're feeding the Windom with co-ax and you expect the shield to 
>> radiate, which of the legs is the shield tied to?  The long one or 
>> the short one?
>> I would expect that it would make a difference.
>>
>> Stan
>>
>
> _______________________________________________
>
>
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk at contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk