Topband: Cage wire performance https://www.pi4cc.nl/album/80-160/slides/P5030195.html

[Peter]

Hi

An easy way to make a cage is to use black irrigation hose.
Just make some 30-50 cm diameter circles Drill 3-4 holes and ready to go
  https://www.pi4cc.nl/album/80-160/slides/P5030195.html 
<https://www.pi4cc.nl/album/80-160/slides/P5030192.html>

Peter
PC2A
https://www.pi4cc.nl 
<https://www.pi4cc.nl/album/80-160/slides/P5030192.html>


Op 4-1-2021 om 16:32 schreef Richard (Rick) Karlquist:
>
> On 1/4/2021 7:05 AM, Kenny Silverman wrote:
> where the wires connect at a point on the top, but with a 4 foot 
> spread of the wires near the ground. This adds about 15-20 kc to the 
> 2:1 bandwidth per the model.
>>
>> Will a 2-wire section like this always behave as a wide/fat conductor 
>> or do I have to worry about voltage/current in Each wire?
>>
>> Regards , Kenny K2KW
>
> Just a guess:  I would think with 2 wires, you would be fairly
> successful with getting good current sharing, as long as there
> wasn't some unbalancing effect, say due to having the vertical
> running along side a tower.
>
> With 3 wires, there is some reason to think that the middle
> wire wouldn't carry much current if the three wires were
> in a plane.  OTOH, if they formed a triangular cross section,
> then it would seem likely that current sharing would be good.
> In general, you want to emulate a round conductor, as opposed
> to a strap.  When straps are used to make inductors, the
> current crowds to the edges.  Round conductors don't have
> such edges, hence they have good current sharing.
>
> I don't believe NEC is good for modeling this.  You have
> to use a tool called "HOBBIES" if you want to do this.
> K6OIK has written some articles about this tool.
>
> 73
> Rick N6RK
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